JP3961516B2 - Non-contact temperature measuring device - Google Patents

Description

  The present invention relates to a non-contact temperature measuring apparatus that receives an electromagnetic wave radiated from an object and measures the temperature of the object in a non-contact manner.

The method of measuring the temperature of a certain object generally measures the temperature without contacting the temperature sensitive part or the like with the contact type of measuring the temperature by bringing the temperature sensitive part into contact with the surface of the object. It can be classified as a non-contact type. The latter measurement method has the advantage that the temperature can be measured without damaging the surface of the object because it can be measured without contacting the surface of the object to be measured. in use.
As an apparatus for realizing such non-contact temperature measurement, an infrared temperature measurement apparatus is conventionally known.

In this type of infrared temperature measuring device, a signal including various frequency components corresponding to the temperature of the object is radiated from all objects, and between the temperature of the object and the intensity of energy of the radiated frequency component. Is a device that measures temperature by focusing on the fact that there is a certain relationship (Planck's law). That is, the temperature is measured by detecting infrared energy radiated from the surface of the object using signals in the infrared region among various frequency components radiated from the object.
According to the infrared temperature measuring device, for example, the processing temperature of kneaded products such as ham, the temperature of the finished product in the processing line, the temperature of the grill pan etc. to be provided to the edible customers together with the food can be measured in a non-contact manner. The temperature of these objects can be controlled.

  Some objects to be measured are sealed in a container such as cardboard or resin when being commercialized, and further packaged with cardboard or the like. For example, butter, margarine, cheese, and the like are generally packaged with cardboard on which letters, pictures, and the like are printed after being sealed in a resin container having a predetermined shape. Further, when the product is transported and stored, it may be further boxed in cardboard, expanded polystyrene or the like. Such containers, cardboard, cardboard, and the like serve as shielding objects interposed between the object and the infrared temperature measuring device. If there is an obstruction in the propagation path, the infrared energy is significantly attenuated by the obstruction. In particular, cardboard and cardboard do not transmit infrared energy. Therefore, the conventional infrared temperature measuring device has a problem that the temperature of the object inside the shielding object or the object blocked by the shielding object cannot be measured correctly.

  It is an object of the present invention to provide a non-contact temperature measurement device that can measure the temperature of an object as described above, which cannot be measured by an infrared temperature measurement device.

Non-contact temperature measuring device provided by the present invention, a non-contact temperature measuring device for measuring the temperature of an object to be measured without contact, of the high-frequency signal having a frequency lower than the infrared rays emitted from the object a receiving antenna for receiving a signal capable of transmitting frequencies predetermined shields that shields the front SL product body, the amplitude value of the signal from the object received by the receiving antenna output by integrating the signal an electronic circuit which, in pre-Symbol product body amplitude value and a plurality of coefficient values computed for different measurement conditions, each based on the known temperature value temperature value is output from the electronic circuit when it is known a coefficient table recording those used in the conversion by a predetermined conversion equation for converting said amplitude value to a temperature value there, among the plurality of coefficient values stored in the coefficient table, And menu means for selecting a coefficient value of Zureka the user, the amplitude by substituting the selected coefficient values to the user and the amplitude value output from the electronic circuit when the measurement through the menu section to the conversion equation conversion means for converting the value into a temperature value, a device having a display means for displaying the converted the temperature value by the conversion means.
The “signal having a frequency that can be transmitted through the shielding object” is, for example, a signal in a microwave band or a millimeter wave band. Signals in such a frequency band are less attenuated by shielding objects (except for metals) than infrared signals, so it is possible to measure the temperature of objects inside shielding objects or objects blocked by shielding objects. It becomes possible.

In an embodiment of the present invention , the measured value recording means for recording the known temperature value and the amplitude value output from the electronic circuit when the object is at the temperature value as the measured value; read from the measured value recording means the known temperature value and the amplitude value of the object to be a coefficient calculating means for calculating a pre-Symbol plurality of engagement number from those values read, was calculated by the coefficient calculating means A non-contact temperature measuring device including coefficient recording means for recording coefficient values in the coefficient table .

The amplitude value output from the electronic circuit is, for example, a voltage value. Said coefficient calculating means, for example, pre-Symbol product body first voltage value output from the electronic circuit when a first temperature value of the known (T1) (V1) and said first temperature value (T1) , the second voltage value outputted from the electronic circuit when the temperature of the pre-Symbol product body is a second temperature value of the known (T2) (V2) and the second temperature value and (T2), respectively V = to calculate the α and beta as the coefficient value by to processing the binary simultaneous equations obtained by substituting the secondary type .alpha.T + beta.
The receiving antenna is, for example, that will receive a signal in a microwave band or millimeter wave band are emitted from the object of the measurement target.

In some embodiments of the receive antenna in the predetermined measurement conditions, which receives a signal capable of transmitting frequencies the predetermined shields, said coefficient calculating means, prior SL and a predetermined measurement condition it is intended to calculate the coefficient values based on the amplitude value and the known temperature value output from the electronic circuit in the conditions under same.

In one embodiment, the coefficient calculating means calculates a new coefficient value based on the measurement condition when a coefficient value for a certain measurement condition is not recorded in the coefficient table . Then, the converting means converts the amplitude value to a temperature value by substituting the newly calculated coefficient value and the amplitude value output from the electronic circuit during the measurement on the conversion formula.

  The predetermined measurement condition includes, for example, a condition regarding the presence or absence of the shielding object and a condition regarding the shape, structure, or material of the shielding object when the shielding object is present.

Non-contact temperature measuring device according to another aspect of the present invention is a non-contact temperature measuring device for measuring the temperature of an object to be measured in a non-contact, high frequency of lower than infrared rays emitted from the object a receiving antenna for receiving a signal capable of transmitting frequencies predetermined shields that shields the front SL product body of the signals, and a reference noise source the noise level to output a known noise signal received by the receiving antenna, The signal from the object amplified by a predetermined amplifier and the output of the reference noise source are alternately input at intervals shorter than the gain fluctuation period of the amplifier , and these differences are integrated, and the integrated value is respectively based on the amplitude values and the known temperature value and an electronic circuit for outputting as the amplitude value, the temperature value before Symbol object body is outputted from the electronic circuit when a known signal from the object And made was recorded by a plurality of coefficient values calculated for each measurement condition that used in conversion by a predetermined conversion equation for converting said amplitude value to a temperature value table is recorded in this table Menu means for allowing the user to select one of the plurality of coefficient values , the coefficient value selected by the user through the menu means, and the amplitude value output from the electronic circuit at the time of measurement. conversion means for converting the amplitude value to a temperature value by substituting a device having a display means for displaying the converted the temperature value by the conversion means.

In the non-contact temperature measurement device according to the other configuration, when a coefficient value for a certain measurement condition is not recorded in the coefficient table, a coefficient calculation unit that calculates a new coefficient value based on the measurement condition is provided. The conversion means may convert the amplitude value into a temperature value by substituting the newly calculated coefficient value and the amplitude value output from the electronic circuit during measurement into the conversion formula.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to measure correctly the temperature of the object inside the shielding object which was not able to be measured with the conventional infrared temperature measuring apparatus, or the object obstruct | occluded by the shielding object.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a diagram showing a configuration of a non-contact temperature measuring apparatus 10 according to the first embodiment of the present invention. FIG. 1 also shows that the temperature of the object X50 is measured by the non-contact temperature measuring device 10 when there is a shielding object 52 that shields the object X50 between the object X 50 to be measured and the non-contact temperature measuring device 10. The state which performs measurement is shown.
In the present embodiment, the object X50 is described as butter packed in a resin container. However, the object X50 is not limited to this but may be any object.
Although the shielding object 52 is described as a corrugated cardboard in the present embodiment, the shielding object 52 is not limited to this and may be made of a material that transmits the signal 51 in the microwave band or the millimeter wave band. For example, a thin tree may be used. The resin container transmits the microwave band signal or the millimeter wave band signal 51 with almost no loss.

Hereinafter, the configuration of the non-contact temperature measuring device 10 of the present embodiment will be described.
The non-contact temperature measuring device 10 does not use an infrared band signal radiated from the object X50 to be measured, unlike the conventional infrared temperature measuring device, but a microwave band radiated from the object X50. Alternatively, the temperature is measured using the millimeter waveband signal 51, and the antenna unit 11, the low noise amplification unit 12, the detection unit 13, the amplification unit 14, and the total power signal processing unit 15 A calibration table 16 and a display unit 17. The operation of the non-contact temperature measuring device 10 is controlled by a control controller (not shown).

The antenna unit 11 is configured to receive a microwave band signal or a millimeter wave band signal 51.
As shown in FIG. 1, the antenna unit 11 has a microwave band or a millimeter wave band radiated from the object X50 when the shielding object 52 exists between the object X50 and the non-contact temperature measuring device 10. Of the signal 51, the signal transmitted through the shielding object 52 is received.
The microwave band or millimeter wave band signal 51 radiated from the object X50 has an intensity (magnitude) depending on the temperature of the object X, as in the infrared region signal, but is an extremely weak signal. Therefore, the signal received by the antenna unit 11 is input to the low noise amplifying unit 12 that generates less noise, and the signal component is amplified. The signal amplified by the low noise amplification unit 12 is detected by the detection unit 13, input to the amplification unit 14, amplified, and input to the total power signal processing unit 15.

The total power signal processing unit 15 includes an electronic circuit that outputs the amplitude value of the signal amplified by the amplification unit 14. The present embodiment includes an integrator (not shown) that integrates the signal amplified by the amplification unit 14 and outputs the integrated signal as a voltage value that is an amplitude value of the object X50 to be measured. The voltage value output from the integrator can be taken out from the output terminal 18.
The total power signal processing unit 15 also converts a voltage value output from the integrator into a temperature value based on a coefficient value stored in a calibration table 16 described later (not shown). Have

  The calibration table 16 calculates a coefficient value indicating a correlation between the temperature of the object X50 to be measured and the voltage of the signal input from the object X50 to the antenna unit 11 via the shielding object 52, and stores the coefficient value. Is. In the present embodiment, the calibration table 16 includes an actual value recording table and a coefficient recording table.

As shown in FIG. 2A, the actual value recording table shows that the output terminal 18 of the signal processing unit 15 for all power when the temperature of the object X50 to be measured is a known first temperature value (T _hot ). The first voltage value (V _hot ) output from the first temperature value and the first temperature value (T _hot ) are recorded, and as shown in FIG. 2B, the temperature of the object to be measured is a known second temperature. When the value is (T _cold ) (lower than the first temperature), the second voltage value (V _cold ) output from the output terminal 18 of the total power signal processing unit 15 and the second temperature value (T _cold ) are It is a table to record.

From the first voltage value (V _hot ) and the first temperature value (T _hot ), the second voltage value (V _cold ) and the second temperature value (T _cold ) recorded in this actual value recording table, The correlation between the temperature value indicating the temperature of the object to be measured and the voltage value output from the integrator of the total power signal processing unit 15 is obtained by the control controller that does not.
This correlation indicates that the first voltage value (V _hot ), the first temperature value (T _hot ), the second voltage value (V _cold ), and the second temperature value (T _cold ) are second order of V = αT + β. It is obtained by calculating the coefficients α and β by substituting into the equation and solving the binary simultaneous equations.

  That is, as shown in FIG. 3, since the temperature of the object and the output voltage are in a proportional relationship, the correlation can be obtained by obtaining the coefficient (slope) α and the coefficient (intercept) β. The coefficients α and β are specifically obtained by the following equations.

FIG. 4 is a graph showing the relationship between temperature and output voltage when a certain shielding object is present between the object to be measured and the non-contact temperature measuring device 10, and the object to be measured. It is a figure which shows the graph which showed the relationship of the temperature versus output voltage when there is no shielding object between the non-contact-type temperature measuring devices.
As can be seen from these graphs, when there is a shielding object between the object to be measured and the non-contact temperature measuring device 10, the output voltage is reduced as compared with the case where there is no shielding object. However, even if a certain shielding object is present, the temperature of the object and the output voltage are in a proportional relationship. Therefore, as in the case where there is no shielding object, the correlation α is obtained by obtaining the slope α and intercept β. Can be obtained.

  The coefficient recording table is a table for recording the coefficients α and β obtained as described above as coefficient values.

FIG. 5 is a diagram illustrating an example of the actual value recording table.
In this measured value record table, as “measurement condition 1”, the temperature and voltage values of the object to be measured are recorded (20 ° C., 0.4 V), (0 ° C., 0.2 V). In addition to this, as “measurement condition 2”, measurement values of the object temperature and voltage values of (30 ° C., 1.1 V) and (5 ° C., 0.8 V) are recorded.
Here, the “measurement condition” indicates conditions such as a condition relating to an object to be measured, a condition relating to the presence or absence of a shielding object, a condition relating to the shape, structure, or material of the shielding object when a shielding object is present.
FIG. 6 is a diagram illustrating an example of the coefficient recording table.
In this coefficient recording table, coefficient value 1 (α = 0.01, β = −2.53) and coefficient value 2 corresponding to “measurement condition 1” and “measurement condition 2” recorded in the actual value recording table of FIG. (Α = 0.012, β = −2.53) are stored respectively.

  One calibration table as described above may be provided, but it may be provided for each object to be measured.

The converter of the signal processing unit 15 for total power converts the voltage value into a temperature value by substituting the voltage value of the object X into the above-mentioned quadratic expression in which such coefficient values are applied to α and β. And output.
Specifically, the temperature T is obtained by the following equation.

The display unit 17 is for displaying temperature values and the like output from the converter of the total power signal processing unit, and in this embodiment, is a display 41 as shown in FIG.
As shown in this figure, the display 41 has a display screen 43 for displaying temperature and the like, and a plurality of menu buttons 42.
By operating any of the menu buttons 42, a coefficient value can be selected, a coefficient value calculation instruction, a coefficient value recording instruction, a temperature display format of an object to be measured can be switched, and the like.
In this embodiment, the display format of the temperature of the object to be measured can be switched between an absolute temperature display, a Celsius temperature display, and an absolute temperature and Celsius temperature display.

  In addition, although the non-contact-type temperature measuring device 10 of this embodiment was described as having the low noise amplification unit 12, the detection unit 13, the amplification unit 14, and the total power signal processing unit 15, the present invention is not limited thereto, and the antenna It suffices to have an electronic circuit that outputs the amplitude value (voltage value) of the component of the signal received by the unit 11.

Hereinafter, a measurement procedure in the case of measuring the temperature of the object X50 to be measured using the non-contact type temperature measuring device 10 will be described with reference to FIG.
At the start of measurement, the controller displays a list of coefficient values recorded in the coefficient recording table on the display screen 43 of the display 41.
In the displayed coefficient value, the coefficient value corresponding to the measurement condition to start measurement from now on, that is, the relationship in the case where the shielding object 52 exists between the object X and the non-contact type temperature measuring device 10. If a numerical value exists, the coefficient value is selected by operating the menu button 42. When there is no coefficient value, “no coefficient value” can be selected by operating the menu button 42.
When the controller detects that any coefficient value in the list has been selected by the user (step S101: Yes), the controller reads the coefficient value from the coefficient recording table (step S102).

On the other hand, when the corresponding coefficient value does not exist in the displayed coefficient values, when the control controller detects that “no coefficient value” is selected by the user (step S101: No), the coefficient value is calculated. Is performed (step S103).
As described above, this processing is performed by _{calculating the} coefficient value from the actually measured values of the first voltage value (V _hot ), the first temperature value (T _hot ), the second voltage value (V _cold ), and the second temperature value (T _cold ). This is the work to calculate α and β.
That is, the first voltage value (V _hot ) and the first temperature value (T _hot ) output from the integrator when the object X 50 is an object X 50 having a known first temperature value (T _hot ) according to a user instruction. when each measured value of the second temperature value object X50 is known second voltage value outputted from the integrator if it is an object X50 of (T _cold) (V _cold) and a second temperature value (T _cold) is It is recorded in the actual value recording table, and the controller calculates coefficient values α and β from these actual values.

Thereafter, the control controller displays on the display 41 an instruction screen as to whether or not to record the coefficient value obtained this time in the coefficient recording table.
When the control controller detects that the user has selected to record in the coefficient recording table by operating the menu button 42 (step S104: Yes), it records the coefficient value in the coefficient recording table. On the other hand, when the control controller detects that the user has selected not to record in the coefficient recording table (step S104: No), the controller does not record the coefficient value in the coefficient recording table.
After the coefficient value is recorded in the coefficient record table, or after detecting that the record value is not recorded in the coefficient record table, the control controller outputs the voltage value output from the integrator of the total power signal processing unit 15. By substituting the coefficient value into the above-mentioned quadratic equation, the converter is controlled to convert the voltage value into the temperature value, and the measured temperature of the object X50 is displayed on the display screen 43 of the display 41 in real time. (Step S106).
Subsequently, when measurement is performed under the same conditions as before (step S107: No), the process returns to step S106 and measurement is continued.
On the other hand, when the measurement under the same conditions as before is finished (step S107: Yes) and the measurement conditions are changed and the measurement is performed (step S108: Yes), the process returns to step S101, and the control controller A list of coefficient values recorded in the coefficient recording table is displayed on the display screen 43 of the display 41.
If the measurement conditions are not changed (step S108: No), the measurement is terminated.

  Thus, in the non-contact type temperature measuring device 10 of this embodiment, instead of using the infrared region signal radiated from the object to be measured as in the conventional infrared temperature measuring device, the microwave band or Since the millimeter-wave band signal is used, the temperature of the object can be measured even when a shielding object such as paper exists between the object to be measured and the infrared temperature measurement device.

Second Embodiment
The non-contact temperature measuring device 20 according to the present embodiment further calculates by reducing the influence on the output voltage by suppressing the fluctuation of the receiving system due to the fluctuation of the power supply voltage and the fluctuation of the ambient temperature. This is a device for reducing the occurrence of errors in the temperature value to be set.
FIG. 9 is a diagram showing a configuration of the non-contact temperature measuring device 20 according to the present embodiment. FIG. 9 also shows the temperature of the object X50 measured by the non-contact type temperature measuring device 20 when there is a shielding object 52 that shields the object X50 between the object X 50 to be measured and the non-contact type temperature measuring device 20. The state which performs measurement is shown.
In addition, about the component same as 1st Embodiment, the same code | symbol as 1st Embodiment shall be attached | subjected.

  As shown in FIGS. 9 and 10, the non-contact temperature measuring device 20 of the present embodiment further includes a switching control unit 21, switches 21 a and 21 b, and a reference noise source 22 with a known noise level (for example, a black spot), It differs from the non-contact temperature measuring device 10 of 1st Embodiment by the point etc. which have the Dicke type | mold signal processing part 23 instead of the signal processing part 15 for all electric power.

The switching control unit 21 outputs a switching control signal for switching each switch to the switches 21a and 21b, and is configured to switch both the switches 21a and 21b at the same time.
The switch 21a switches the switch based on the switching control signal, and switches the signal input to the low noise amplifying unit 12 to the signal received by the antenna unit 11 or the signal of the reference noise source 22 alternately.
Therefore, in the present embodiment, the signal received by the antenna unit 11 and the signal of the reference noise source 22 are alternately input to the low noise amplifying unit 12. These signals input to the low noise amplifying unit 12 are amplified in signal components, detected by the detecting unit 13 and amplified by the amplifying unit 14 as in the first embodiment.
The signal amplified by the amplification unit 14 is input to the Dicke signal processing unit 23.
That is, the Dicke type signal processing unit 23 outputs the output signal (V _ant ) of the amplification unit 14 for the signal from the object X received by the antenna unit 11 processed as described above, and the reference noise source 22. The output signal (V _ref ) of the amplification unit 14 for the signal is input alternately.

The Dicke signal processing unit 23 includes a synchronous detection unit 23a shown in FIG. 10, an integrator (not shown), and a converter.
The synchronous detection unit 23 a has a switch 21 b, and the switch 21 b is switched by a switching control signal from the switching control unit 21. That is, the switch 21b is configured to be switched in synchronization with the switching of the switch 21a.
By switching the switch 21b, the output signal (V _ant ) and the output signal (V _ref ) are alternately output from the synchronous detector 23a. Further, since the polarity of the output signal is alternately inverted by switching the switch 21b, the polarity of either the output signal (V _ant ) or the output signal (V _ref ) is inverted and output. In the present embodiment, the polarity of the signal of the output signal (V _ref ) is inverted. That is, the synchronous detection output signal output from the synchronous detection unit 23a is as shown in FIG.

This synchronous detection output signal is integrated by an integrator and output as a voltage value of the object X50 to be measured.
This voltage value indicates a voltage proportional to the difference between the voltage of the output signal (V _ant ) and the output signal (V _ref ).
Therefore, according to the non-contact temperature measuring device 20 of the present embodiment, it is possible to reduce the influence on the output voltage due to the receiving system gain fluctuation caused by the fluctuation of the power supply voltage and the fluctuation of the ambient temperature.
If the switching cycle of the switch is shorter than the gain variation cycle, the operation is as if the amplitude variation was absorbed by the signal of the reference noise source, so that the influence of the gain variation can be further reduced.
Note that the voltage value output from the integrator of the Dicke signal processing unit 23 can be taken out from the output terminal 25 as in the first embodiment.
Moreover, the process which converts a voltage value into a temperature value is the same as that of 1st Embodiment.

  According to the non-contact temperature measuring device 20 of the present embodiment, it is possible to reduce the influence on the output voltage due to the reception system gain fluctuation caused by the fluctuation of the power supply voltage and the fluctuation of the ambient temperature.

  Although the non-contact temperature measuring device 20 of the present embodiment has been described as having an integrator, a low-pass filter may be used instead of the integrator.

The figure which shows the non-contact-type temperature measuring device of 1st Embodiment of this invention. The figure which shows the measurement state of a measured value. The figure which shows the relationship between the temperature of an object, and output voltage. The figure which shows the relationship between the temperature of an object, and an output voltage in the case where a shielding object exists, and the case where a shielding object does not exist. The figure which shows an example of an actual value recording table. The figure which shows an example of a coefficient recording table. The figure which shows a display. The figure which shows the measurement procedure in the case of measuring using the non-contact-type temperature measuring device of 1st Embodiment. The figure which shows the non-contact-type temperature measuring device of 2nd Embodiment of this invention. The figure which shows the synchronous detection part of the non-contact-type temperature measuring device of 2nd Embodiment of this invention. The figure which shows the synchronous detection output signal output from a synchronous detection part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,20 Non-contact-type temperature measuring device 11 Antenna part 12 Low noise amplification part 13 Detection part 14 Amplification part 15 Full power signal processing part 16, 24 Calibration table 17 Display part 18 Output terminal 21 Switching control part 21a, 21b Switch 22 Reference noise source 23 Dicke signal processing unit 50 Object X
51 Microwave or millimeter wave signal 52 Shield

Claims (9)

A non-contact temperature measuring device that measures the temperature of an object to be measured in a non-contact manner,
A receiving antenna that receives a signal having a frequency that can pass through a predetermined shielding object that shields the object among high-frequency signals having a frequency lower than that of infrared light emitted from the object;
An electronic circuit that outputs an amplitude value of a signal from the object received by the receiving antenna by integrating the signal;
When the temperature value of the object is known, the amplitude value output from the electronic circuit and a plurality of coefficient values calculated for different measurement conditions based on the known temperature value, the amplitude value being the temperature A coefficient table that records what is used when converting according to a predetermined conversion formula for converting to a value;
Menu means for allowing the user to select one of the coefficient values recorded in the coefficient table;
Conversion means for converting the amplitude value into a temperature value by substituting the coefficient value selected by the user through this menu means and the amplitude value output from the electronic circuit during measurement into the conversion formula;
Display means for displaying the temperature value converted by the conversion means,
Non-contact temperature measuring device. Actual value recording means for recording the known temperature value and the amplitude value output from the electronic circuit when the object is at that temperature value as an actual value;
Coefficient calculation means for reading the known temperature value and the amplitude value for the object to be measured from the measured value recording means, and calculating the plurality of coefficient values from these read values;
Coefficient recording means for recording the coefficient value calculated by the coefficient calculating means in the coefficient table;
The non-contact temperature measuring device according to claim 1. The amplitude value output from the electronic circuit is a voltage value,
The coefficient calculating means includes the first voltage value (V1) and the first temperature value (T1) output from the electronic circuit when the known temperature value is the first temperature value (T1), and the known temperature value. When the temperature value is the second temperature value (T2), the second voltage value (V2) and the second temperature value (T2) output from the electronic circuit are respectively expressed by a quadratic expression of “V = αT + β”. Α and β are calculated as the coefficient values by the arithmetic processing of the binary simultaneous equations assigned to
The non-contact temperature measuring device according to claim 2. The receiving antenna receives a microwave or millimeter wave signal radiated from the object;
The non-contact temperature measuring device according to claim 1, 2 or 3. The receiving antenna receives a signal having a frequency that can pass through the predetermined shielding object under predetermined measurement conditions;
The coefficient calculation means calculates the coefficient value based on the amplitude value output from the electronic circuit and the known temperature value under the same condition as the predetermined measurement condition.
The non-contact temperature measuring device according to claim 2 or 3. The coefficient calculating means calculates a new coefficient value based on the measurement condition when a coefficient value for a certain measurement condition is not recorded in the coefficient table,
The conversion means converts the amplitude value into a temperature value by substituting the newly calculated coefficient value and the amplitude value output from the electronic circuit at the time of measurement into the conversion formula,
The non-contact temperature measuring device according to claim 5. The measurement condition includes a condition regarding the presence or absence of the shielding object and a condition regarding the shape, structure, or material of the shielding object when the shielding object is present.
The non-contact temperature measuring device according to claim 5 or 6. A non-contact temperature measuring device that measures the temperature of an object to be measured in a non-contact manner
A receiving antenna that receives a signal having a frequency that can pass through a predetermined shielding object that shields the object among high-frequency signals having a frequency lower than that of infrared light emitted from the object;
A reference noise source that outputs a noise signal with a known noise level;
The signal from the object received by the receiving antenna and amplified by a predetermined amplifier and the output of the reference noise source are alternately input at intervals shorter than the gain fluctuation period of the amplifier, and the difference is integrated. An electronic circuit that outputs the integrated value as an amplitude value of a signal from the object;
When the temperature value of the object is known, the amplitude value output from the electronic circuit and a plurality of coefficient values calculated for different measurement conditions based on the known temperature value, the amplitude value being the temperature A table that records what is used when converting according to a predetermined conversion formula for converting to a value;
Menu means for allowing the user to select one of the coefficient values recorded in the table,
Conversion means for converting the amplitude value into a temperature value by substituting the coefficient value selected by the user through this menu means and the amplitude value output from the electronic circuit during measurement into the conversion formula;
Display means for displaying the temperature value converted by the conversion means,
Non-contact temperature measuring device. A coefficient calculation means for calculating a new coefficient value based on the measurement condition when a coefficient value for a measurement condition is not recorded in the coefficient table;
The conversion means converts the amplitude value into a temperature value by substituting the newly calculated coefficient value and the amplitude value output from the electronic circuit at the time of measurement into the conversion formula,
The non-contact temperature measuring device according to claim 8.

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