CN210090301U - Infrared detection air chamber structure of expired air - Google Patents
Infrared detection air chamber structure of expired air Download PDFInfo
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- CN210090301U CN210090301U CN201822212187.8U CN201822212187U CN210090301U CN 210090301 U CN210090301 U CN 210090301U CN 201822212187 U CN201822212187 U CN 201822212187U CN 210090301 U CN210090301 U CN 210090301U
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Abstract
The utility model discloses an infrared detection air chamber structure of exhaled breath, this structure includes infrared light source, an air chamber section of thick bamboo, infrared detector. The infrared light source and the detector are both designed by adopting a detachable module structure, so that the infrared light source and the detector are convenient to detach. The infrared light source and the detector adopt a lateral screw jacking fixing mode in the connecting sleeve, can be adjusted in 360-degree angle direction, can be axially moved and adjusted, and is high in installation and debugging efficiency. The light source and the detector consider the heat insulation requirement, and the test stability is high. In order to reduce the mounting stress and the influence of vibration on the optical signal, the supporting structure adopts vibration isolation measures.
Description
Technical Field
The utility model belongs to infrared detection equipment field, concretely relates to exhalation infrared detection air chamber structure for carbon dioxide isotope carbon-12 carbon-13 concentration in the test exhalation gas.
Background
At present, exhaled breath detection is an effective detection method for clinically diagnosing helicobacter pylori. The method is implemented by measuring the volume concentration ratio of carbon-13 containing carbon dioxide to carbon-12 containing carbon dioxide in the exhaled air.
The exhaled breath detection method mainly uses instruments such as a mass spectrum analyzer, an infrared spectrum analyzer and a laser spectrum analyzer. The mass spectrum analyzer has high cost, huge structure and complex operation. The core component of the laser spectrometer, the laser, is high in cost, complex in structure, and poor in reliability and portability. The infrared spectrum analyzer works based on a thermal radiation infrared light source, and is low in cost, simple in structure and high in reliability.
Traditional infrared spectrum analysis appearance adopts the heating wire as the light source, and the thermal capacity is big, needs to adopt synchronous machine and rotatory slide, and the shock resistance is poor, portable poor. The utility model discloses an infrared light source based on special film resistor technology preparation. The thin film resistor whose surface is specially processed has a black body radiation characteristic and a small heat capacity, and intensity modulation can be easily performed by periodically changing an applied voltage. The detection instrument based on the thin film resistance light source is light in weight and good in portability.
The gas chamber structure is a core part of the whole instrument and equipment, and the gas chamber structure internally comprises core components such as a light source, a sample cell, a detector and the like. Therefore, the air chamber structure is crucial to the signal quality of the whole instrument and debugging and installation. However, similar designs of infrared spectrum analyzers still exist today: 1. the light path signal is inconvenient to adjust, the structure is clumsy, and the installation and debugging efficiency is low. 2. The temperature and vibration interference is large, the detection precision is not high, and the requirement of clinical diagnosis is difficult to meet. Therefore, there is a need for an air chamber structure that facilitates efficient installation and debugging, has low interference, high output signal quality, and high detection accuracy. The utility model provides an air chamber structure that contains light source, air chamber and detector.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an air chamber structure theory of operation as follows: the voltage supplied to the infrared light source is modulated by a square wave, and the light source radiates infrared light with the same frequency as the modulated square wave. After the infrared light passes through the air chamber, the infrared light is attenuated due to the infrared absorption of the measured gas components in the air chamber to the characteristic wave band. The absorption relation of the detected gas to the infrared light in the characteristic wave band conforms to the beer-Lambert law, and the higher the concentration of the detected gas is, the longer the length of the gas chamber is, and the larger the attenuation amplitude of the transmitted infrared light is. The concentration value of the detected sample (carbon-12 or carbon-13) can be obtained by detecting the attenuation amplitude of the characteristic infrared light through a detector.
The main components of the utility model comprise a light source, a detector and an air chamber cylinder. Two ends of the air chamber cylinder are respectively provided with a connecting sleeve for connecting the light source and the detector. The connection of the air chamber cylinder and the light source is realized through a connecting sleeve on the side of the light source, and the connection of the air chamber cylinder and the detector is realized through a connecting sleeve on the side of the detector. The two connecting sleeves are placed on the support base, and the support base supports the whole optical system. A rubber damping ring is arranged between the two connecting sleeves and the bracket.
The air chamber cylinder of the utility model is a long cylinder made of aluminum, the precision of the inner wall of the cylinder is high, and the gold plating treatment is carried out. The inner wall of the cylinder has higher smoothness, is corrosion resistant and rustless, and the adsorption force of the measured gas molecules on the inner wall of the cylinder of the gas chamber is weak, so that the gas molecules are not easy to remain and the measurement interference is small.
The utility model discloses an infrared light source be special film resistor technology preparation, small. Small heat capacity and high working frequency. Therefore, voltage modulation is adopted in the work, and a mechanical chopper wheel is not needed. To make more efficient use of the infrared source, the infrared source is equipped with an ellipsoidal reflector. The infrared light source is positioned at a focus position of the ellipsoidal reflector. The infrared light emitted by the infrared light source is converged to another focus position at a certain distance after being reflected by the ellipsoidal reflector. Another focal point of convergence is ideally the position of the detector. The focus of the infrared source onto the detector is not perfectly circular, which requires rotation of the source and detector relative to each other to achieve optimal detection intensity.
The utility model discloses a light source and ellipsoid reflector insert the light source seat as an integral piece in, then compress tightly the light source seat with copper screw thread tamponade. Therefore, the light source and the light source seat can be assembled and disassembled quickly, and the light source can be replaced. However, the light source is difficult to replace by using the method of bonding and fixing. The light source seat is made of nylon material because nylon is easy to process and has high strength and thermal conductivity inferior to metal. Therefore, the influence of the external temperature on the light source is effectively isolated. The screw thread press plug is made of copper, has good heat conductivity and large heat capacity, and is tightly contacted with the light source. Under the condition that the nylon seat isolates the heat transfer of the environment, the heat capacity of the light source module can be further increased, and the influence of the environment temperature is reduced. The light source is arranged in the light source seat and then is used as an integral light source module for position adjustment. The light source seat is arranged in the connecting sleeve, and the light source seat can rotate at any angle in the connecting sleeve, so that the detector obtains the optimal focal strength. The light source seat is fixed through light source seat locking screw after the angle direction rotation adjustment is suitable, prevents to rotate. The locking screw penetrates through the connecting sleeve to tightly push against the circumference of the light source seat, and the light source seat can be quickly fixed only by one screw. And adopt the fixed mode to four screws of terminal surface, can only realize four 90 degrees angle of rotation position regulation, installation, fixed inefficiency moreover. In addition, the light source seat can also move along the axis of the sleeve, so that the optimal longitudinal focus position can be adjusted.
The utility model discloses an infrared detector fixed mounting in the detector seat. The cylindrical detector is inserted into the detector base and then pressed tightly by a copper threaded press plug. Therefore, the detector can be assembled quickly and can be disassembled conveniently. And adopt the sticky mode to fix the detector in the light source seat, then have the problem that changes the difficulty after the detector damages.
The infrared detector is sensitive to temperature and is easy to influence by the ambient temperature. The detector seat is made of nylon and has the effect of isolating the influence of the environment on the temperature of the detector. The copper screw is fixed with the shell of the detector, so that the heat capacity is increased, and the influence of temperature fluctuation of the shell of the detector is reduced. The detector is assembled with the detector base through the threaded press plug to form a detector module, so that the overall position is convenient to adjust. After the cylindrical detector seat is inserted into the detector special connecting sleeve, the detector seat can rotate 360 degrees. The detector seat is fixed through a locking screw after the debugging in the angle direction is completed. The locking screw penetrates through the connecting sleeve arm to tightly push the detector seat to realize fixation. The detector seat can protect the detector from the compressive stress of the locking screw. In addition, the detector base can be moved axially within the adapter sleeve to find the optimum longitudinal focal position of the light source. Therefore, the lateral jacking mode can realize quick adjustment and fixation only by one screw, and the debugging efficiency is high; the end face fixing mode of four screws has the problems that the screws cannot rotate at any angle, the longitudinal distance is adjusted fussy, and the debugging efficiency is low.
The utility model discloses a two connecting sleeve couple together light source seat and detector and an air chamber section of thick bamboo respectively. The light source side connecting sleeve is provided with an air inlet nozzle. The detector side connecting sleeve is provided with an air outlet nozzle. Two sapphire sealing pieces are respectively arranged in the two connecting sleeves, so that the sapphire optical filter and the air chamber cylinder can form a closed air chamber, and the closed air chamber performs air exchange operation through the air inlet nozzle and the air outlet nozzle. The sapphire sealing sheet allows infrared light with a wavelength of less than 5 micrometers to penetrate through, so that interference of the infrared light with long wave is eliminated, and the infrared band for carbon dioxide measurement is not affected.
The utility model discloses an aluminum plate support is high supporting such as two connecting sleeve get up, and whole air chamber becomes horizontality like this. And a rubber vibration damping ring is arranged between the aluminum plate bracket and the air chamber sleeve. The effect of rubber damping ring can reduce the deformation that the fixed stress of support constructed to the light path structure, reduces the influence of external vibration in measuring to measuring light intensity, improves the stability of signal.
Drawings
FIG. 1 is an assembly view of the present invention, illustrating the positional relationship of the components;
fig. 2 is a schematic view of the component structure of the embodiment shown in fig. 1.
The reference numerals are explained as follows:
1-infrared light source 2-ellipsoid reflecting mirror
3-light source screw thread press plug 4-nylon light source seat
5- (light source side) connecting sleeve 6-light source seat locking screw
7-support seat 8-rubber damping ring
9-air inlet nozzle 10- (light source side) sapphire window sheet
11-gas chamber cylinder 12- (detector side) sapphire window sheet
13-air outlet nozzle 14-detector base locking screw
15- (detector side) connecting sleeve 16-detector nylon seat
17-probe screw plug 18-probe
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1-2, an infrared light source module is composed of an infrared light source 1, an ellipsoidal reflector 2, a threaded plug 3 and a light source base 4. The infrared light source 1 is manufactured by a special thin film resistor process and has a black body radiation characteristic. The light source 1 and the ellipsoidal reflector 2 are inserted into the light source 4 as a single piece and then are held down by a copper 3 threaded plug. Therefore, 1, 2, 3 and 4 form an integral light source module, so that the light source module is convenient to install and adjust in a light path, and is convenient to disassemble and replace the light source. The light source seat is made of nylon, the heat conductivity of the nylon is weaker than that of metal, and the temperature influence of the sleeve connecting sleeve 5 on the light source module can be reduced. The copper screw thread press plug 3 is closely contacted with the light sources 1 and 2, so that the heat capacity of the light sources can be increased, and the temperature fluctuation of the light source module is reduced.
The infrared detector module is composed of an infrared detector 18, a threaded press plug 17 and a detector base 16. The infrared detector is inserted into the detector base and then screwed down and fixed by a threaded press plug. Thus, 16, 17 and 18 form an integral module, which is convenient for installation and debugging in the optical path and convenient for disassembly and replacement. The module manufactured by gluing has the problem of difficulty in disassembling and replacing the detector. The detector seat is made of nylon materials, the heat conductivity is poorer than that of metal, and the influence of the temperature change of the metal connecting sleeve 15 on the detector module can be reduced. The copper thread plug 17 is in close contact with the detector, so that the heat capacity of the detector can be further increased, and the influence of the ambient temperature on the working temperature of the detector is reduced.
The gas chamber cylinder 11 is a long straight cylinder with smooth inner wall made of aluminum, and the inner wall is plated with gold. Thus, the inner wall of the cylinder has higher smoothness and strong corrosion resistance. The device is not rusted, the molecules of the gas to be measured are not easy to be adsorbed on the inner wall of the air cylinder, the gas to be measured is not easy to remain, and the measurement precision is high.
The infrared light source holder 4 is connected to one end of the air chamber tube 11 through a light source side connecting sleeve 5. And the infrared detector base 16 is connected with the other end of the air chamber cylinder 11 through the detector side connecting sleeve 15. Ideally, the light source 1 is located at a focal point of the ellipsoidal reflector 2. The infrared detector 18 is located at another focal point of the ellipsoidal reflector. During installation and adjustment, the light source 1 and the light source 18 detector can be moved longitudinally along the connecting sleeve 5 and 15 axis to change the distance between them, so as to achieve the best focusing effect. The light source 1 is not an ideal point light source, and the focal point focused by the ellipsoidal reflector 2 is not an ideal circle. The optimum detection intensity can be obtained by rotating the light source or the detector in the angular direction and changing the relative angle between them. After debugging is finished, the light source module and the detector module are locked by the light source seat locking screw 6 and the detector seat locking screw 14.
The sapphire sealing sheets and the air chamber cylinder 11 are arranged in the two connecting sleeves 10 and 12 to form a closed air chamber. The gas exchange of the gas chamber is carried out by an air inlet nozzle 9 and an air outlet nozzle 13 which are arranged on the connecting sleeve. The sapphire sealing sheet allows infrared light with a wavelength less than 5 micrometers to be transmitted, infrared light with a longer wavelength is filtered, and the infrared band for measuring carbon dioxide cannot be affected.
An optical path system consisting of the infrared light source module, the detector module and the closed air chamber is horizontally supported by a bracket 7. The optical path system is sensitive to stress and vibration after being precisely debugged. A rubber damping ring 8 is arranged between the support 7 and the connecting sleeves 5 and 15 of the optical path system. The rubber shock absorption can avoid the support from causing stress distortion to the light path system, isolate external vibration and improve the stability of signal measurement.
Claims (5)
1. An exhaled air infrared detection air chamber structure comprises an infrared light source module, an infrared detector module, an air chamber and a vibration reduction bracket; it is characterized in that: the infrared light source module can be adjusted in the connecting sleeve in the axial direction and in the angle direction in a rotating manner, and a fixing structure of the side wall of the light source module is propped by a side wall locking screw; the infrared detector module is designed to be adjustable in the axial direction and in the angular direction in the connecting sleeve, and a fixing structure for tightly pushing the side wall of the detector module by using a side wall locking screw is adopted; a rubber damping ring structure is adopted between the bracket and the cylindrical connecting sleeve; carrying out gold plating treatment on the inner wall of the air chamber cylinder after processing; the two ends of the air chamber cylinder are combined into a closed air chamber by adopting sapphire sealing sheets and the air chamber cylinder.
2. The structure of an infrared exhaled breath detection cell according to claim 1, wherein the light source module is composed of a light source base, a light source, an ellipsoidal reflector and a threaded plug, and the light source is compressed by the threaded plug.
3. The structure of the infrared detecting air cell for exhaled air according to claim 2, wherein the light source base is made of an engineering plastic material with poor thermal conductivity, and the threaded press plug is made of a metal material with good thermal conductivity.
4. The structure of an infrared exhaled breath detection cell according to claim 1, wherein the detector module is composed of a detector base, a detector, and a threaded press plug, wherein the detector is pressed in the detector base by the threaded press plug.
5. The structure of the infrared detecting air cell for exhaled breath according to claim 4, wherein said detector seat is made of an engineering plastic material with poor thermal conductivity, and the threaded press plug is a metal material with good thermal conductivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822212187.8U CN210090301U (en) | 2018-12-27 | 2018-12-27 | Infrared detection air chamber structure of expired air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822212187.8U CN210090301U (en) | 2018-12-27 | 2018-12-27 | Infrared detection air chamber structure of expired air |
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| Publication Number | Publication Date |
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| CN210090301U true CN210090301U (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822212187.8U Active CN210090301U (en) | 2018-12-27 | 2018-12-27 | Infrared detection air chamber structure of expired air |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116660166A (en) * | 2023-07-31 | 2023-08-29 | 中国科学院空天信息创新研究院 | Gas cavity structure for cavity-assisted gas concentration measurement |
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2018
- 2018-12-27 CN CN201822212187.8U patent/CN210090301U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116660166A (en) * | 2023-07-31 | 2023-08-29 | 中国科学院空天信息创新研究院 | Gas cavity structure for cavity-assisted gas concentration measurement |
| CN116660166B (en) * | 2023-07-31 | 2023-09-22 | 中国科学院空天信息创新研究院 | Gas cavity structure for cavity-assisted gas concentration measurement |
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