CN105954595B - Blade dielectric constant measuring device and measuring method - Google Patents
Blade dielectric constant measuring device and measuring method Download PDFInfo
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- CN105954595B CN105954595B CN201610247800.2A CN201610247800A CN105954595B CN 105954595 B CN105954595 B CN 105954595B CN 201610247800 A CN201610247800 A CN 201610247800A CN 105954595 B CN105954595 B CN 105954595B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
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Abstract
The invention provides a blade dielectric constant measuring device and a measuring method, which comprises a bracket, wherein a clamp is arranged on the bracket, a high-temperature probe is fixed on the clamp through a nut, an adapter at the upper end of the high-temperature probe is connected with a Port1 of a vector network analyzer through a coaxial line, a lifting platform is arranged on one side of the bracket, a vacuum packaging machine is arranged on the lifting platform, the vacuum packaging machine is connected with a vacuum sealing bag, and the measuring method comprises the following steps of sample preparation, system installation, instrument calibration, sample placement and vacuumizing operation and dielectric constant measurement: can ensure good close contact between the sample and the probe, and has high measurement accuracy.
Description
Technical Field
The invention relates to the technical field of blade dielectric constant measuring devices, in particular to a blade dielectric constant measuring device and a blade dielectric constant measuring method.
Background
Most materials in nature exhibit a lossy insulator in the microwave band, called dielectric, or simply medium. The real part of the complex dielectric constant of the medium represents the storage capacity of the medium to the electromagnetic wave, and the imaginary part reflects the loss of the medium to the electromagnetic wave. The complex dielectric constant reflects the characteristics of radiation, scattering, absorption and the like of the medium on electromagnetic waves in a macroscopic sense, and reflects the internal structure and characteristics of a substance in a microscopic sense. In the field of electromagnetism, it can be said that the distinction of media can be represented by a complex dielectric constant. The precision of the dielectric constant of the blade directly influences the simulation precision of the microwave vegetation radiation and scattering model. The research on the dielectric properties of the blade is an important component for carrying out vegetation parameter inversion by microwave remote sensing.
The laboratory measurement of the dielectric constant of the blade is mainly based on a microwave network analyzer and generally adopts methods such as a waveguide method, a free space method, a coaxial probe method and the like for measurement. Compared with other measuring methods, the coaxial probe method can carry out wide-frequency-band measurement. However, the coaxial probe method requires that the measured sample is thick enough, that is, the length and the loss tangent are large enough, and the measured sample local complex dielectric constant is the complex dielectric constant of the whole sample area assuming that the transmission attenuation of the electromagnetic wave passing through the sample is finished and the measured sample is uniform. Since the thickness of a single blade is typically in the order of millimeters, the blades are typically stacked for measurement. The coaxial probe method also requires that there is no gap contact between the probe and the sample, and air in the contact layer, if any, affects the measurement result, so the air layer between the two must be eliminated. The method adopted is simple to compact the blade, but the method is difficult to control the force, the structure of the surface of the blade is damaged due to too high pressure, and the gap between blade layers cannot be eliminated due to too low pressure. In addition, the deformation of the coaxial line is difficult to avoid when the pressure is applied to the probe, so that certain errors are introduced. These all add to the uncertainty of the measurement. Moreover, accurate pressure measurements can also add complexity to the system.
Disclosure of Invention
In order to solve the technical problems, the invention provides a blade dielectric constant measuring device and a measuring method, wherein a vacuum packaging machine and a vacuum sealing bag are introduced to vacuumize a sample, so that air in the vacuum sealing bag can be exhausted, the structure of the sample is ensured to be harmless and to be in good close contact with a probe, and the measuring accuracy is high.
The embodiment of the application provides a blade dielectric constant measuring device, which comprises a bracket, the support on be equipped with anchor clamps, high temperature probe passes through the nut and fixes on anchor clamps, the adapter of high temperature probe upper end passes through the coaxial line and is connected with the Port1 Port of vector network analyzer, the support on be equipped with lift platform, the last vacuum packaging machine that is equipped with of lift platform, vacuum packaging machine is connected with the vacuum seal bag.
The invention relates to a blade dielectric constant measuring method, which adopts a vacuumizing method to exhaust air between sample layers and between a sample and a probe, and comprises the following steps:
s1: sample preparation
S11, removing dust on the surface of the blade;
s12, cutting the sample by adopting a metal cylinder with the diameter of 38mm or 29mm, wherein the diameter of the circular blade is larger than that of the probe;
s13, overlapping the multiple round blades in the step S12 to enable the transmission attenuation of the electromagnetic waves through the sample to be completed;
s2: system installation
S21, punching a hole in the vacuum sealing bag to be sealed by using a puncher, wherein the diameter of the hole is 3.5mm, and the hole is preferably just used for enabling the adapter to pass through;
s22, inserting the high-temperature probe into the vacuum sealing bag from inside to outside through the hole, wherein the probe end is in the bag, and the adapter extends out of the vacuum sealing bag;
s23, fixing the high-temperature probe on a clamp, screwing a nut, arranging the probe end and the vacuum sealing bag below the clamp, arranging the adapter above the clamp, and connecting one end of the coaxial line with the adapter and the other end with a Port1 of a network analyzer.
S3: instrument scaling
Calibrating the probe by using air, a short-circuiting device and distilled water, and setting parameters such as probe type, frequency, water temperature and the like in software before calibration; the vacuum sealing bag is required to be lifted up during calibration, so that the probe is not shielded by the vacuum sealing bag and is completely exposed in the air, and no bubbles can exist on the surface of the probe during calibration by using distilled water;
s4: sample placement and evacuation operations
S41, stacking the samples neatly, placing the samples into a vacuum sealing bag, placing the vacuum sealing bag under a high-temperature probe, placing a vacuum packaging machine on a lifting platform, and adjusting the height of the vacuum packaging machine to enable the vacuum packaging machine and the high-temperature probe to be at the same height;
and S42, starting the vacuum packaging machine, pumping out air in the vacuum sealing bag, enabling the high-temperature probe to be in close contact with the sample and the sample layer, and sealing the vacuum sealing bag by the vacuum packaging machine when the vacuum degree in the vacuum sealing bag reaches the specified vacuum degree.
S5: dielectric constant measurement
The samples were observed using a vector network analyzer, the measurements were repeated 3 times, and the average was taken to reduce the measurement error.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. in the invention, because the air content in the sample bag only depends on the performance of the vacuum packaging machine, the vacuum degree in the bag can reach 80kpa by selecting the high-performance vacuum packaging machine, namely, the pressure in the bag is 80kpa lower than the atmospheric pressure outside the bag, thus not only ensuring the probe to be in close contact with the sample, but also avoiding the damage of external force to the sample structure, thereby improving the stability and reliability of the measurement result.
2. The method has no external force directly acting on the probe, thereby reducing the error caused by the deformation of the coaxial line.
3. The method is simple, and each link in the measurement can be well controlled and is easy to implement.
4. The method can be used for measuring the dielectric constant of a soft flaky sample similar to a blade.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure, 1, a bracket, 2, a clamp, 3, a high-temperature probe, 4, a nut, 5, an adapter, 6, a coaxial line, 7, a vector network analyzer, 8, a Port1 Port, 9, a lifting platform, 10, a vacuum packaging machine, 11 and a vacuum sealing bag.
Detailed Description
The invention provides a blade dielectric constant measuring device and a measuring method, which can ensure that a sample is in good close contact with a probe and have high measuring accuracy.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
As shown in fig. 1, the blade dielectric constant measuring device of this embodiment, including support 1, support 1 on be equipped with anchor clamps 2, high temperature probe 3 passes through nut 4 to be fixed on anchor clamps 2, adapter 5 of high temperature probe 3 upper end is connected with Port1 Port 8 of vector network analyzer 7 through coaxial line 6, support 1 one side be equipped with lift platform 9, be equipped with vacuum packaging machine 10 on the lift platform 9, vacuum packaging machine 10 is connected with vacuum sealing bag 11.
The blade dielectric constant measuring method comprises the following steps:
s1: sample preparation
S11, removing dust on the surface of the blade;
s12, cutting the sample by adopting a metal cylinder with the diameter of 38mm or 29mm, wherein the diameter of the circular blade is larger than that of the probe;
s13, overlapping the multiple round blades in the step S12 to enable the transmission attenuation of the electromagnetic waves through the sample to be completed;
s2: system installation
S21, punching the vacuum sealing bag 11 to be sealed by adopting a puncher, wherein the diameter of the hole is 3.5mm, and preferably just enabling the adapter 5 to pass through the hole;
s22, inserting the high-temperature probe 3 into the vacuum sealing bag 11 from inside to outside through a hole, wherein the probe end is in the bag, and the adapter 5 extends out of the vacuum sealing bag 11;
s23, fixing the high-temperature probe 3 on the clamp 2, screwing the nut 4, arranging the probe end and the vacuum sealing bag 11 below the clamp 2, arranging the adapter 5 above the clamp 2, connecting one end of the coaxial line 6 with the adapter 5, and connecting the other end with the Port1 Port 8 of the vector network analyzer 7.
S3: instrument scaling
Calibrating the high-temperature probe 3 by using air, a short-circuiting device and distilled water, and setting parameters such as probe type, frequency, water temperature and the like in software before calibration; the vacuum sealing bag 11 needs to be lifted up during calibration, so that the high-temperature probe 3 is not shielded by the vacuum sealing bag 11 and is completely exposed in the air, and no bubbles can exist on the surface of the high-temperature probe 3 during calibration by using distilled water;
s4: sample placement and evacuation operations
S41, stacking the samples neatly, placing the samples into a vacuum sealing bag 11 and under the high-temperature probe 3, placing a vacuum packaging machine 10 on a lifting platform 9, and adjusting the height of the vacuum packaging machine 10 to enable the vacuum packaging machine 10 and the high-temperature probe 3 to be at the same height;
and S42, starting the vacuum packaging machine 10, pumping out air in the vacuum sealing bag 11, enabling the high-temperature probe 3 to be in close contact with the sample and the sample layer, and sealing the vacuum sealing bag 11 by the vacuum packaging machine 10 when the vacuum degree in the vacuum sealing bag 11 reaches the specified vacuum degree.
S5: dielectric constant measurement
The sample was observed using a vector network analyzer 7, and the measurements were repeated 3 times, and averaged to reduce the measurement error.
The subsequent steps are as follows:
1) after the measurement is finished, one end of the vacuum sealing bag is cut off by scissors, a sample is taken out, the mass of the sample is weighed, and the mass is compared with the mass before measurement so as to ensure that the water content is not obviously changed in the measurement.
2) The probe is disassembled or the next set of samples is prepared for measurement.
3) And drying the group of samples, and weighing the dry weight of the samples.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A blade dielectric constant measuring method is characterized in that air between sample layers and between a sample and a probe is exhausted by adopting a vacuumizing method, and the method comprises the following steps:
s1: sample preparation
S11, removing dust on the surface of the blade;
s12, cutting the sample by adopting a metal cylinder with the diameter of 38mm or 29mm, wherein the diameter of the circular blade is larger than that of the probe;
s13, overlapping the multiple round blades in the step S12 to enable the transmission attenuation of the electromagnetic waves through the sample to be completed;
s2: system installation
S21, punching a vacuum sealing bag (11) to be sealed by adopting a puncher, wherein the diameter of the hole is 3.5mm, and the adapter (5) can pass through the hole properly;
s22, inserting the high-temperature probe (3) into the vacuum sealing bag (11) from inside to outside through a hole, wherein the probe end is in the bag, and the adapter (5) extends out of the vacuum sealing bag (11);
s23, fixing the high-temperature probe (3) on the clamp (2), screwing the nut (4), arranging the probe end and the vacuum sealing bag (11) below the clamp (2), arranging the adapter (5) above the clamp (2), connecting one end of the coaxial line (6) with the adapter (5), and connecting the other end of the coaxial line with a Port1 Port (8) of the vector network analyzer (7);
s3: instrument scaling
Calibrating the high-temperature probe (3) by using air, a short-circuiting device and distilled water, wherein parameters of the type, the frequency and the water temperature of the probe are set in software before calibration; the vacuum sealing bag (11) needs to be lifted up during calibration, so that the high-temperature probe (3) is not shielded by the vacuum sealing bag (11) and is completely exposed in the air, and no bubbles can exist on the surface of the high-temperature probe (3) during calibration by using distilled water;
s4: sample placement and evacuation operations
S41, stacking the samples neatly, placing the samples into a vacuum sealing bag (11) and under a high-temperature probe (3), placing a vacuum packaging machine (10) on a lifting platform (9), and adjusting the height of the vacuum packaging machine (10) to enable the vacuum packaging machine and the high-temperature probe (3) to be at the same height;
s42, starting the vacuum packaging machine (10), pumping out air in the vacuum sealing bag (11), enabling the high-temperature probe (3) to be in close contact with a sample, and sealing the vacuum sealing bag (11) by the vacuum packaging machine (10) when the vacuum degree in the vacuum sealing bag (11) reaches a specified vacuum degree;
s5: dielectric constant measurement
The sample is observed using a vector network analyzer (7), the measurements are repeated 3 times, and the average is taken to reduce the measurement error.
2. A blade dielectric constant measuring apparatus to which the blade dielectric constant measuring method according to claim 1 is applied, characterized in that: including support (1), support (1) on be equipped with anchor clamps (2), high temperature probe (3) are fixed on anchor clamps (2) through nut (4), adapter (5) of high temperature probe (3) upper end are connected with Port1 Port (8) of vector network analyzer (7) through coaxial line (6), support (1) on be equipped with lift platform (9), be equipped with vacuum packaging machine (10) on lift platform (9), vacuum packaging machine (10) are connected with vacuum sealing bag (11).
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| CN201610247800.2A CN105954595B (en) | 2016-04-20 | 2016-04-20 | Blade dielectric constant measuring device and measuring method |
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| CN201610247800.2A CN105954595B (en) | 2016-04-20 | 2016-04-20 | Blade dielectric constant measuring device and measuring method |
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