CN214149622U - Many people are temperature measuring device simultaneously based on centreless optic fibre - Google Patents
Many people are temperature measuring device simultaneously based on centreless optic fibre Download PDFInfo
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- CN214149622U CN214149622U CN202120042721.4U CN202120042721U CN214149622U CN 214149622 U CN214149622 U CN 214149622U CN 202120042721 U CN202120042721 U CN 202120042721U CN 214149622 U CN214149622 U CN 214149622U
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Abstract
The utility model discloses a multi-person simultaneous temperature measuring device based on coreless optical fibers, which comprises a scanning laser, an optical fiber circulator, an Arrayed Waveguide Grating (AWG), a disposable optical fiber temperature measuring probe, a photoelectric detector and a central control unit; when the environmental temperature of the disposable optical fiber temperature measuring probe changes, the temperature sensitive liquid filled in the probe expands to cause the intensity of the reflection spectrum of the disposable optical fiber temperature measuring probe to change, and the temperature condition of a measuring point can be obtained by detecting the change of the intensity of the reflection spectrum; the utility model has the advantages that: the designed temperature measuring device can measure temperature by multiple persons simultaneously, the disposable optical fiber temperature measuring probe in the device is low in price, can be lost after being used, is safe and reliable, and avoids the defects that an electronic thermometer is easy to suffer from electromagnetic interference and potential safety hazards caused by careless leakage of mercury in the mercury thermometer.
Description
Technical Field
The utility model belongs to the technical field of the optical fiber sensing and the temperature measurement field, concretely relates to many people are temperature measuring device simultaneously based on centreless optic fibre.
Background
Highly contagious diseases spread rapidly worldwide, and accurate body temperature measurements have guiding significance for preliminary diagnosis of viral or bacterial infections. Traditional body temperature measurement mostly adopts modes such as mercury thermometer, electronic thermometer and the more popular rifle type infrared clinical thermometer now, and these modes measuring speed is slow, anti-electromagnetic interference is weak, receive the ambient temperature influence big, and reuse probably leads to the further propagation of virus or bacterial infection, therefore a temperature measuring device that can overcome above problem has become medical urgent need. The utility model provides a many people are temperature measuring device simultaneously based on centreless optic fibre can avoid the closely contact of temperature detection time measuring medical staff and surveyed personnel, has improved medical staff operational environment's security.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an easy operation, measurement accuracy height, handy many people temperature measuring device simultaneously based on centreless optic fibre, disposable optic fibre temperature probe in the device has utilized multimode interference principle and liquid thermometer temperature measurement principle, according to the characteristic that disposable optic fibre temperature probe output spectrum changes along with temperature change, finally realizes the measurement of body temperature.
The utility model adopts the technical proposal that:
a multi-person simultaneous temperature measuring device based on a coreless optical fiber is characterized by comprising a scanning laser (1), an optical fiber circulator (2), an array waveguide grating (3), a disposable optical fiber temperature measuring probe (4), a photoelectric detector (5) and a central control unit (6); the output end of the scanning laser (1) is connected with the input end of the optical fiber circulator (2), the first output end of the optical fiber circulator (2) is connected with the input end of the arrayed waveguide grating (3), one output end of the arrayed waveguide grating (3) is connected with the input end of the disposable temperature measuring probe (4), the second output end of the optical fiber circulator (2) is connected with the input end of the photoelectric detector (5), and the output end of the photoelectric detector (5) is connected with the central control unit (6).
A many people temperature measuring device simultaneously based on centreless optic fibre, its characterized in that: the disposable optical fiber temperature measuring probe (4) consists of a coreless optical fiber (4-1), a capillary tube (4-2) and a filling liquid (4-3).
The disposable optical fiber temperature measuring probe (4) is characterized in that: the effective refractive index of the filling liquid (4-3) is smaller than that of the coreless fiber (4-1), and the filling liquid (4-3) has high thermal expansion coefficient and linear expansion characteristic in a wide temperature range, and can be selected according to measurement requirements.
The disposable optical fiber temperature measuring probe (4) is characterized in that: the left end of the capillary tube (4-2) is closed, and the right end is sealed after filling liquid (4-3) is added.
The disposable optical fiber temperature measuring probe (4) is characterized in that: the surface of the coreless fiber (4-1) and the inner wall of the capillary (4-2) need to be subjected to surface hydrophobic treatment so as to avoid the residue of the filling liquid (4-3).
A many people temperature measuring device simultaneously based on centreless optic fibre, its characterized in that: the lengths of coreless optical fibers (4-1) in the disposable optical fiber temperature measuring probe (4) connected with each output channel of the arrayed waveguide grating (3) are different so as to match the central wavelength of each output channel of the arrayed waveguide grating (3).
The utility model discloses a theory of operation is:
when light is coupled into a coreless fiber from a single-mode fiber, the central wavelength of its output spectrum can be expressed as follows, since the coreless fiber forms a multimode fiber structure with an external medium (air or filled liquid):
wherein n is1For the effective refractive index of multimode fiber structures, D1Is a multimode optical fiberThe effective diameter of the structure, L, is the length of the coreless fiber.
When the ambient temperature changes, the liquid filled in the capillary tube expands, and the disposable optical fiber temperature measuring probe is equivalent to a multimode optical fiber (MM) taking a section of air as a cladding1) And a section of multimode optical fiber (MM) filled with a liquid as a cladding2) The central wavelength of the output spectrum of the disposable optical fiber temperature measuring probe is caused to drift, and the expression of the central wavelength after the drift is as follows:
wherein, λ'mIs the wavelength after the drift; n is1，D1，L1Respectively multimode optical fiber (MM)1) Effective refractive index, effective diameter and length; n is2，D2，L2Respectively multimode optical fiber (MM)2) Effective refractive index, effective diameter and length.
Multimode optical fiber MM2Length L of2The relationship with temperature can be given by the following equation:
where Δ α represents a difference in thermal expansion coefficient between the filling liquid and the capillary, V is the total volume of the filling liquid, and Δ T is a temperature change amount.
The formula (1), (2) and (3) show that the spectrum wavelength drift delta lambda of the disposable optical fiber temperature measuring probe can be expressed as follows:
when the output spectrum of the disposable optical fiber temperature measuring probe passes through an Arrayed Waveguide Grating (AWG), the central wavelength of each channel of the AWG is fixed, and the output spectrum of the disposable optical fiber temperature measuring probe drifts along with the change of temperature, so that the light intensity input to the photoelectric detector changes, and the temperature of a human body is reversely deduced by measuring the change of the output voltage of the photoelectric detector.
The beneficial effects of the utility model reside in that:
the utility model discloses utilize centreless optic fibre and outside medium to form multimode fiber structure, combine AWG's branch ripples and ripples function of combining, realize many people temperature measurement simultaneously. When the temperature rises, the expansion of the liquid filled in the capillary tube leads to the drift of the wavelength of the output spectrum of the disposable optical fiber temperature measuring probe, the change of the light intensity at the central wavelength of each channel in the output spectrum of the AWG leads to the change of the output voltage of the photoelectric detector, and finally the change of the output voltage is monitored by the central control unit to reversely deduce the temperature of the human body. The whole device is simple in structure, convenient to operate and carry, the disposable optical fiber temperature measuring probe is low in price, can be lost after being used, is safe and reliable, and avoids the defects that the electronic thermometer is easy to suffer from electromagnetic interference and potential safety hazards caused by careless leakage of mercury in the mercury thermometer.
Drawings
FIG. 1 is a schematic structural diagram of a multi-user simultaneous temperature measurement device based on coreless optical fibers.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a multi-person simultaneous temperature measuring device based on coreless optical fibers is characterized by comprising a scanning laser (1), an optical fiber circulator (2), an arrayed waveguide grating (3), a disposable optical fiber temperature measuring probe (4), a photoelectric detector (5) and a central control unit (6); the output end of the scanning laser (1) is connected with the input end of the optical fiber circulator (2), the first output end of the optical fiber circulator (2) is connected with the input end of the arrayed waveguide grating (3), one output end of the arrayed waveguide grating (3) is connected with the input end of the disposable temperature measuring probe (4), the second output end of the optical fiber circulator (2) is connected with the input end of the photoelectric detector (5), and the output end of the photoelectric detector (5) is connected with the central control unit (6). Foretell many people is temperature measuring device simultaneously based on centreless optic fibre, its characterized in that: the disposable optical fiber temperature measuring probe (4) consists of a coreless optical fiber (4-1), a capillary tube (4-2) and a filling liquid (4-3). The disposable optical fiber temperature measuring probe (4) is characterized in that: the effective refractive index of the filling liquid (4-3) is smaller than that of the coreless fiber (4-1), and the filling liquid (4-3) has high thermal expansion coefficient and linear expansion characteristic in a wide temperature range, and can be selected according to measurement requirements. The disposable optical fiber temperature measuring probe (4) is characterized in that: the left end of the capillary tube (4-2) is closed, and the right end is sealed after filling liquid (4-3) is added. The disposable optical fiber temperature measuring probe (4) is characterized in that: the surface of the coreless fiber (4-1) and the inner wall of the capillary (4-2) need to be subjected to surface hydrophobic treatment so as to avoid the residue of the filling liquid (4-3). Foretell many people is temperature measuring device simultaneously based on centreless optic fibre, its characterized in that: the lengths of coreless optical fibers (4-1) in the disposable optical fiber temperature measuring probe (4) connected with each output channel of the arrayed waveguide grating (3) are different so as to match the central wavelength of each output channel of the arrayed waveguide grating (3).
The method utilizes a coreless optical fiber and an external medium (air or filling liquid) to form a multimode optical fiber structure, and combines the AWG to realize simultaneous temperature measurement of a plurality of persons. During measurement, N output ends of the AWG are connected with N disposable temperature measuring probes through a channel 1thFor example, scanning laser emission and channel 1thCenter wavelength λ1Matched laser light, laser light entering 1 through AWGthThe output spectrum of the disposable optical fiber temperature measuring probe can drift along with the change of temperature, and the spectrum after the drift returns to the channel 1 of the AWGthThe output spectral intensity of which changes due to the filter characteristics of the AWG, and the channel 1 can be reversely deduced by detecting the change of the output spectral intensitythThe temperature change condition of the patient realizes the body temperature measurement. Temperature measurement of other channels and the channel 1thThe same procedure is used.
Claims (6)
1. A multi-person simultaneous temperature measuring device based on a coreless optical fiber is characterized by comprising a scanning laser (1), an optical fiber circulator (2), an array waveguide grating (3), a disposable optical fiber temperature measuring probe (4), a photoelectric detector (5) and a central control unit (6); the output end of the scanning laser (1) is connected with the input end of the optical fiber circulator (2), the first output end of the optical fiber circulator (2) is connected with the input end of the arrayed waveguide grating (3), one output end of the arrayed waveguide grating (3) is connected with the input end of the disposable temperature measuring probe (4), the second output end of the optical fiber circulator (2) is connected with the input end of the photoelectric detector (5), and the output end of the photoelectric detector (5) is connected with the central control unit (6).
2. The multi-person simultaneous temperature measuring apparatus based on coreless fiber as recited in claim 1, wherein: the disposable optical fiber temperature measuring probe (4) consists of a coreless optical fiber (4-1), a capillary tube (4-2) and a filling liquid (4-3).
3. The multi-person simultaneous temperature measuring apparatus based on coreless fiber as recited in claim 2, wherein: the effective refractive index of the filling liquid (4-3) is smaller than that of the coreless fiber (4-1), and the filling liquid (4-3) has high thermal expansion coefficient and linear expansion characteristic in a wide temperature range, and can be selected according to measurement requirements.
4. The multi-person simultaneous temperature measuring apparatus based on coreless fiber as recited in claim 2, wherein: the left end of the capillary tube (4-2) is closed, and the right end is sealed after filling liquid (4-3) is added.
5. The multi-person simultaneous temperature measuring apparatus based on coreless fiber as recited in claim 2, wherein: the surface of the coreless fiber (4-1) and the inner wall of the capillary (4-2) need to be subjected to surface hydrophobic treatment so as to avoid the residue of the filling liquid (4-3).
6. The multi-person simultaneous temperature measuring apparatus based on coreless fiber as recited in claim 1, wherein: the lengths of coreless optical fibers (4-1) in the disposable optical fiber temperature measuring probe (4) connected with each output channel of the arrayed waveguide grating (3) are different so as to match the central wavelength of each output channel of the arrayed waveguide grating (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120042721.4U CN214149622U (en) | 2021-01-08 | 2021-01-08 | Many people are temperature measuring device simultaneously based on centreless optic fibre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120042721.4U CN214149622U (en) | 2021-01-08 | 2021-01-08 | Many people are temperature measuring device simultaneously based on centreless optic fibre |
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| Publication Number | Publication Date |
|---|---|
| CN214149622U true CN214149622U (en) | 2021-09-07 |
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| CN202120042721.4U Expired - Fee Related CN214149622U (en) | 2021-01-08 | 2021-01-08 | Many people are temperature measuring device simultaneously based on centreless optic fibre |
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2021
- 2021-01-08 CN CN202120042721.4U patent/CN214149622U/en not_active Expired - Fee Related
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