CN114858714A - Photoacoustic cell for gas photoacoustic spectrum detection - Google Patents
Photoacoustic cell for gas photoacoustic spectrum detection Download PDFInfo
- Publication number
- CN114858714A CN114858714A CN202210480960.7A CN202210480960A CN114858714A CN 114858714 A CN114858714 A CN 114858714A CN 202210480960 A CN202210480960 A CN 202210480960A CN 114858714 A CN114858714 A CN 114858714A
- Authority
- CN
- China
- Prior art keywords
- photoacoustic
- cavity part
- cylindrical cavity
- gas
- hyperbolic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to the technical field of gas detection, and discloses a photoacoustic cell for gas photoacoustic spectrum detection. The photoacoustic cell comprises a shell, an air inlet, an air outlet, an air inlet lens, an air outlet lens and at least one photoacoustic reaction module, wherein the photoacoustic reaction module comprises a sound sensor and a dumbbell-shaped photoacoustic reaction cavity, the photoacoustic reaction cavity comprises two cylindrical cavity parts and a hyperbolic cavity part, the hyperbolic cavity part is communicated between the two cylindrical cavity parts and is symmetrical about the longitudinal symmetry axis of the hyperbolic cavity part, the sound sensor is arranged in the middle of the hyperbolic cavity part, the air inlet is communicated with one cylindrical cavity part, the air outlet is communicated with the other cylindrical cavity part, and the air inlet lens and the air outlet lens are respectively arranged on two sides of the shell. The invention optimizes the structure of the existing photoacoustic cell, designs the photoacoustic cell with the bus in a hyperbolic curve, has simple structure, is easy to process, and improves the quality factor to a certain extent.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a photoacoustic cell for gas photoacoustic spectrum detection.
Background
In a conventional photoacoustic spectroscopy trace gas detection system, a photoacoustic cell is an indispensable part, and mainly plays a role of storing a gas sample. In order to reduce the influence of external noise, the acoustic signals generated by the photoacoustic effect can only be detected in the photoacoustic cell. In order to obtain accurate photoacoustic signals, the quality factor of the photoacoustic cell is a key factor that should be considered in the design of the photoacoustic cell, which directly determines the accuracy of the photoacoustic spectroscopy trace gas detection system.
The existing commonly used photoacoustic cell is a cylindrical photoacoustic cell with small volume size, and can realize low-frequency resonance. However, the figure of merit of the cylindrical photoacoustic cell is typically small, making the error in gas detection results large.
Disclosure of Invention
The invention provides a photoacoustic cell for gas photoacoustic spectrum detection, which solves the technical problem of small quality factor of the existing cylindrical photoacoustic cell.
The invention provides a photoacoustic cell for photoacoustic spectrometry detection of gas, which comprises a shell, a gas inlet, a gas outlet, a light inlet lens, a light outlet lens and at least one photoacoustic reaction module, wherein the shell is provided with a gas inlet and a gas outlet;
the photoacoustic reaction module comprises a sound sensor and a dumbbell-shaped photoacoustic reaction cavity, the photoacoustic reaction cavity is arranged in the shell and comprises a first cylindrical cavity part, a second cylindrical cavity part and a hyperbolic cavity part, the hyperbolic cavity part is communicated between the first cylindrical cavity part and the second cylindrical cavity part, the first cylindrical cavity part and the second cylindrical cavity part are symmetrical about the longitudinal symmetry axis of the hyperbolic cavity part, and the middle position of the hyperbolic cavity part is connected with or close to the sound sensor;
the gas inlet is communicated with the first cylindrical cavity part for introducing gas to be detected, and the gas outlet is communicated with the second cylindrical cavity part for discharging the gas to be detected;
the light inlet lens is arranged on one side of the shell facing the opening of the first cylindrical cavity part, and the light outlet lens is arranged on one side of the shell facing the opening of the second cylindrical cavity part.
According to one mode of the invention, when the sound sensor is close to the middle position of the hyperbolic cavity part, the distance between the sound sensor and the outer wall of the hyperbolic cavity part is not more than 0.5 mm.
According to one possible implementation of the invention, the acoustic sensor is a microphone, a piezoelectric ceramic microphone or an optical fiber acoustic sensor.
According to one implementation manner of the present invention, there are two photoacoustic reaction modules, and the two photoacoustic reaction modules are symmetrical with respect to the central axis of the housing, the light entrance lens faces the first cylindrical cavity portion of one of the photoacoustic reaction modules, and the light exit lens faces the second cylindrical cavity portion opposite to the first cylindrical cavity portion of the one of the photoacoustic reaction modules.
According to one implementation mode of the invention, a first light guide channel is arranged between the light inlet lens and the opening of the first cylindrical cavity part facing the light inlet lens;
and/or a second light guide channel is arranged between the light-emitting lens and the opening of the second cylindrical cavity part facing the light-emitting lens.
According to one implementation mode of the invention, the air inlet comprises an air inlet nozzle, a first air inlet pipe and a second air inlet pipe which are connected with the air inlet nozzle, and the air outlet comprises an air outlet nozzle, a first air outlet pipe and a second air outlet pipe which are connected with the air outlet nozzle;
the first air inlet pipe is connected with a first cylindrical cavity part of one photoacoustic reaction module, and the second air inlet pipe is connected with a first cylindrical cavity part of another photoacoustic reaction module;
the first air outlet pipe is connected with the second cylindrical cavity part of one photoacoustic reaction module, and the second air outlet pipe is connected with the second cylindrical cavity part of the other photoacoustic reaction module.
According to one implementable aspect of the present invention, the photoacoustic cell further comprises a base; the base is connected with the bottom of the shell.
According to the technical scheme, the invention has the following advantages:
the invention relates to a photoacoustic cell for photoacoustic spectrometry detection of gas, which comprises a shell, a gas inlet, a gas outlet, a light inlet lens, a light outlet lens and at least one photoacoustic reaction module, wherein the shell is provided with a gas inlet and a gas outlet; the photoacoustic reaction module comprises a sound sensor and a dumbbell-shaped photoacoustic reaction cavity, the photoacoustic reaction cavity comprises a first cylindrical cavity part, a second cylindrical cavity part and a hyperbolic cavity part, the first cylindrical cavity part and the second cylindrical cavity part are communicated with each other, the first cylindrical cavity part and the second cylindrical cavity part are symmetrical about the longitudinal symmetry axis of the hyperbolic cavity part, and the middle position of the hyperbolic cavity part is connected with or close to the sound sensor; the gas inlet is communicated with the first cylindrical cavity part for introducing gas to be detected, and the gas outlet is communicated with the second cylindrical cavity part for discharging the gas to be detected; the light inlet lens is arranged on one side of the shell facing the opening of the first cylindrical cavity part, and the light outlet lens is arranged on one side of the shell facing the opening of the second cylindrical cavity part; the invention optimizes the structure of the existing photoacoustic cell, designs the photoacoustic cell with the bus in a hyperbolic curve, has simple structure, is easy to process, and improves the quality factor to a certain extent.
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 inventive exercise.
Fig. 1 is a schematic structural diagram of a photoacoustic cell for photoacoustic spectroscopy of a gas according to an alternative embodiment of the present invention;
fig. 2 is a schematic structural diagram of a photoacoustic cell for photoacoustic spectroscopy of a gas according to another alternative embodiment of the present invention.
Reference numerals:
1-a shell; 2-an air inlet; 3-air outlet; 4-a light-entering lens; 5-a light-emitting lens; 6-a photoacoustic reaction module; 7-a base; 21-an air inlet nozzle; 22-a first inlet duct; 23-a second inlet line; 31-an air outlet nozzle; 32-a first air outlet pipe; 33-a second outlet pipe; 61-a sound sensor; 62-a photoacoustic reaction chamber; 621-a first cylindrical cavity portion; 622-second cylindrical cavity part; 623-hyperbolic cavity part.
Detailed Description
The embodiment of the invention provides a photoacoustic cell for gas photoacoustic spectrum detection, which is used for solving the technical problem of small quality factor of the existing cylindrical photoacoustic cell.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a schematic structural diagram of a photoacoustic cell for photoacoustic spectroscopy detection of a gas according to an embodiment of the present invention.
Referring to fig. 1, the hyperbolic photoacoustic cell provided by the embodiment of the present invention includes a housing 1, an air inlet 2, an air outlet 3, an optical input lens 4, an optical output lens 5, a photoacoustic reaction module 6, and a base 7.
Wherein the base 7 is connected to the bottom of the housing 1. The bottom of the base 7 may be provided with associated fixing means to fix the hyperbolic photoacoustic cell in a suitable detection position.
The photoacoustic reaction module 6 is a single module, and comprises an acoustic sensor 61 and a dumbbell-shaped photoacoustic reaction cavity 62, wherein the photoacoustic reaction cavity 62 is arranged in the housing 1, the photoacoustic reaction cavity 62 comprises a first cylindrical cavity 621, a second cylindrical cavity 622 and a hyperbolic cavity 623, the hyperbolic cavity 623 is communicated between the first cylindrical cavity 621 and the second cylindrical cavity 622, and the first cylindrical cavity 621 and the second cylindrical cavity 622 are symmetrical with respect to the longitudinal symmetry axis of the hyperbolic cavity 623;
the middle position of the hyperbolic cavity portion 623 is connected with the sound sensor 61;
the gas inlet 2 is communicated with the first cylindrical cavity 621 for introducing gas to be tested, and the gas outlet 3 is communicated with the second cylindrical cavity 622 for discharging the gas to be tested;
the light inlet lens 4 is disposed on the side of the housing 1 facing the opening of the first cylindrical cavity 621, and the light outlet lens 5 is disposed on the side of the housing 1 facing the opening of the second cylindrical cavity 622.
As a way of implementation, the acoustic sensor 61 may also be not connected to the middle of the hyperbolic cavity portion 623, but near the middle of the hyperbolic cavity portion 623. The distance between the sound sensor 61 and the outer wall of the hyperbolic cavity portion 623 needs to be no more than 0.5mm, so that the detection accuracy of the sound sensor 61 on the sound signal is guaranteed.
The sound sensor 61 may be a microphone, a piezo ceramic microphone or a fiber optic sound sensor. Preferably, the sound sensor 61 is a microphone. The microphone has high sensitivity and can ensure the detection precision of the acoustic signal.
As a way of implementation, a channel for guiding light may be provided between the light entrance lens 4 and the opening of the facing first cylindrical cavity portion 621. Likewise, a channel for guiding light may also be provided between the light-exiting lens 5 and the opening of the facing second cylindrical cavity portion 622. Through setting up the light guide channel, can retrain the light direction of incident photoacoustic reaction chamber 62, and avoid casing 1 other positions to absorb light to be favorable to improving gaseous photoacoustic effect intensity at photoacoustic reaction chamber 62.
When the hyperbolic photoacoustic cell of the embodiment is used for gas detection, gas to be detected enters from the gas inlet 2, modulated laser is emitted into the photoacoustic reaction cavity 62 from the light inlet lens 4, the gas is excited by the laser to generate an acoustic signal, the gas resonates in the hyperbolic cavity 623, and the acoustic signal is detected by the acoustic sensor 61. By processing the acoustic signal detected by the acoustic sensor 61, the concentration information of the detected gas can be determined.
In order to test the performance of the hyperbolic photoacoustic cell structure of the above embodiment of the invention, according to finite element analysis, a model is constructed by using COMSOL software, and the sound pressure response and the quality factor of the hyperbolic photoacoustic cell structure and the existing cylindrical photoacoustic cell at the eigenfrequency above 1000Hz are compared and analyzed. Simulations have found that the sound pressure response and quality factor of the hyperbolic photoacoustic cell structure of the above-described embodiment of the present invention are 20% higher than those of the conventional cylindrical photoacoustic cell at high frequencies.
In addition, further carrying out experimental tests, measuring the structures of the cylindrical photoacoustic cell and the hyperbolic photoacoustic cell under a high-frequency condition, recording the sound pressure response of the cylindrical photoacoustic cell and calculating the quality factors of the cylindrical photoacoustic cell and the hyperbolic photoacoustic cell. The results show that the sound pressure response and quality factor of the hyperbolic photoacoustic cell structure at high frequency are 12% higher than that of the cylindrical photoacoustic cell.
Fig. 2 is a schematic structural diagram of a photoacoustic cell for photoacoustic spectroscopy detection of a gas according to another alternative embodiment of the present invention.
Referring to fig. 2, compared with the hyperbolic photoacoustic cell structure in fig. 1, the hyperbolic photoacoustic cell according to the embodiment of the present invention has two photoacoustic reaction modules 6.
The two photoacoustic reaction modules 6 of the present embodiment are symmetrical with respect to the central axis of the housing 1, the light entrance lens 4 faces the first cylindrical cavity 621 of one of the photoacoustic reaction modules 6, and the light exit lens 5 faces the second cylindrical cavity 622 opposite to the first cylindrical cavity 621 of the one of the photoacoustic reaction modules 6.
A first light guide channel is disposed between the light-entering lens 4 and the facing opening of the first cylindrical cavity 621, and a second light guide channel is disposed between the light-exiting lens 5 and the facing opening of the second cylindrical cavity 622.
The air inlet 2 comprises an air inlet nozzle 21, a first air inlet pipe 22 and a second air inlet pipe 23 which are connected with the air inlet nozzle 21, and the air outlet 3 comprises an air outlet nozzle 31, a first air outlet pipe 32 and a second air outlet pipe 33 which are connected with the air outlet nozzle 31; the first air inlet pipe 22 is connected to the first cylindrical cavity 621 of one photoacoustic reaction module 6, the second air inlet pipe 23 is connected to the first cylindrical cavity 621 of another photoacoustic reaction module 6, the first air outlet pipe 32 is connected to the second cylindrical cavity 622 of one photoacoustic reaction module 6, and the second air outlet pipe 33 is connected to the second cylindrical cavity 622 of another photoacoustic reaction module 6.
When gas detection is performed by using the hyperbolic photoacoustic cell of the present embodiment, gas to be detected enters from the gas inlet 2, modulated laser light is emitted from the light entrance lens 4 into one of the photoacoustic reaction cavities 62, the gas expands in the one of the photoacoustic reaction cavities 62 and is compressed in the other photoacoustic reaction cavity 62, and thus the gas generates acoustic signals with opposite phases in the two hyperbolic cavity portions 623 serving as resonant cavities. The concentration information of the detection gas is determined based on the two acoustic signals, so that the quality factor of the photoacoustic cell can be further improved.
In order to detect the performance of the hyperbolic photoacoustic cell structure provided by the embodiment of the invention, according to finite element analysis, a model is constructed by utilizing COMSOL software, and the sound pressure response and the quality factor of the hyperbolic photoacoustic cell structure and the existing cylindrical photoacoustic cell under the intrinsic frequency of more than 1000Hz are compared and analyzed. Simulations have found that the sound pressure response and quality factor of the hyperbolic photoacoustic cell structure of the above-described embodiment of the present invention are 25% higher than those of the conventional cylindrical photoacoustic cell at high frequencies.
In addition, further carrying out experimental tests, measuring the structures of the cylindrical photoacoustic cell and the hyperbolic photoacoustic cell under a high-frequency condition, recording the sound pressure response of the cylindrical photoacoustic cell and calculating the quality factors of the cylindrical photoacoustic cell and the hyperbolic photoacoustic cell. The results show that the sound pressure response and quality factor of the hyperbolic photoacoustic cell structure at high frequency are 18% higher than that of the cylindrical photoacoustic cell.
The embodiment of the invention has the advantages of simple structure, easy processing, certain improvement of quality factors, better performance and higher degree of designability compared with the existing cylindrical photoacoustic cell, and important application prospect.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A photoacoustic cell for gas photoacoustic spectrum detection is characterized by comprising a shell, a gas inlet, a gas outlet, a light inlet lens, a light outlet lens and at least one photoacoustic reaction module;
the photoacoustic reaction module comprises a sound sensor and a dumbbell-shaped photoacoustic reaction cavity, the photoacoustic reaction cavity is arranged in the shell and comprises a first cylindrical cavity part, a second cylindrical cavity part and a hyperbolic cavity part, the hyperbolic cavity part is communicated between the first cylindrical cavity part and the second cylindrical cavity part, the first cylindrical cavity part and the second cylindrical cavity part are symmetrical about the longitudinal symmetry axis of the hyperbolic cavity part, and the middle position of the hyperbolic cavity part is connected with or close to the sound sensor;
the gas inlet is communicated with the first cylindrical cavity part for introducing gas to be detected, and the gas outlet is communicated with the second cylindrical cavity part for discharging the gas to be detected;
the light inlet lens is arranged on one side of the shell facing the opening of the first cylindrical cavity part, and the light outlet lens is arranged on one side of the shell facing the opening of the second cylindrical cavity part.
2. The photoacoustic cell for photoacoustic spectroscopy of claim 1 wherein the acoustic sensor is located at a distance of no more than 0.5mm from the outer wall of the hyperbolic cavity part when the acoustic sensor is located near the middle of the hyperbolic cavity part.
3. The photoacoustic cell for photoacoustic spectroscopy of claim 2 wherein the acoustic sensor is a microphone, a piezoelectric ceramic microphone or a fiber optic acoustic sensor.
4. The photoacoustic cell for photoacoustic spectroscopy of claim 1 wherein there are two photoacoustic reaction modules, and the two photoacoustic reaction modules are symmetrical about the central axis of the housing, the light-entering lens faces a first cylindrical cavity of one of the photoacoustic reaction modules, and the light-exiting lens faces a second cylindrical cavity opposite to the first cylindrical cavity of the one of the photoacoustic reaction modules.
5. The photoacoustic cell for photoacoustic spectroscopy of claim 4 wherein a first light guide channel is disposed between the light entrance lens and the opening of the first cylindrical cavity portion;
and/or a second light guide channel is arranged between the light-emitting lens and the opening of the second cylindrical cavity part facing the light-emitting lens.
6. The photoacoustic cell for photoacoustic spectroscopy of claim 4, wherein the gas inlet comprises a gas inlet nozzle and first and second gas inlet tubes connected to the gas inlet nozzle, and the gas outlet comprises a gas outlet nozzle and first and second gas outlet tubes connected to the gas outlet nozzle;
the first air inlet pipe is connected with a first cylindrical cavity part of one photoacoustic reaction module, and the second air inlet pipe is connected with a first cylindrical cavity part of another photoacoustic reaction module;
the first air outlet pipe is connected with the second cylindrical cavity part of one photoacoustic reaction module, and the second air outlet pipe is connected with the second cylindrical cavity part of the other photoacoustic reaction module.
7. The photoacoustic cell for photoacoustic spectroscopy of any one of claims 1 to 6, further comprising a base;
the base is connected with the bottom of the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210480960.7A CN114858714A (en) | 2022-05-05 | 2022-05-05 | Photoacoustic cell for gas photoacoustic spectrum detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210480960.7A CN114858714A (en) | 2022-05-05 | 2022-05-05 | Photoacoustic cell for gas photoacoustic spectrum detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114858714A true CN114858714A (en) | 2022-08-05 |
Family
ID=82635127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210480960.7A Pending CN114858714A (en) | 2022-05-05 | 2022-05-05 | Photoacoustic cell for gas photoacoustic spectrum detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114858714A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116539535A (en) * | 2023-04-14 | 2023-08-04 | 华南师范大学 | Photoacoustic cell, system and method for aerosol acidity detection |
-
2022
- 2022-05-05 CN CN202210480960.7A patent/CN114858714A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116539535A (en) * | 2023-04-14 | 2023-08-04 | 华南师范大学 | Photoacoustic cell, system and method for aerosol acidity detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11300499B2 (en) | Multi-cavity semi-open resonant photoacoustic cell and multi-gas simultaneous measurement system | |
| WO2023213067A1 (en) | Horn-shaped photoacoustic cell for photoacoustic spectroscopy gas detection | |
| US10670564B2 (en) | Photoacoustic detector | |
| JP2008532036A (en) | Photoacoustic spectroscopy detector and system | |
| CN114858714A (en) | Photoacoustic cell for gas photoacoustic spectrum detection | |
| CN109765185A (en) | A kind of Laser Photoacoustic Spectroscopy detection device using single photoacoustic cell measurement multicomponent gas | |
| WO2022213584A1 (en) | Differential photoacoustic spectroscopy gas detection device based on single cantilever beam | |
| CN217586869U (en) | Photoacoustic cell for gas photoacoustic spectrum detection | |
| CN207850906U (en) | A kind of resonant mode photoacoustic cell for the detection of gas optoacoustic spectroscopy | |
| CN114813574A (en) | Differential photoacoustic spectrum gas concentration detection device based on dual-channel T-shaped photoacoustic cell | |
| Cheng et al. | The effect of the photoacoustic Field-Photoacoustic cell coupling term on the performance of the gas detection system | |
| CN113109268B (en) | Photoacoustic spectroscopy enhancement apparatus and method for gas detection using the same | |
| CN110361332A (en) | A kind of photoacoustic cell for the detection of gas optoacoustic spectroscopy | |
| CN114002184B (en) | Multi-resonance enhanced photoacoustic spectrum multi-component gas simultaneous detection device and method | |
| CN217304882U (en) | Horn-shaped photoacoustic cell for gas photoacoustic spectrum detection | |
| CN115032153A (en) | Photoacoustic cell for photoacoustic spectrum detection | |
| CN217586890U (en) | Ellipsoidal resonance photoacoustic cell based on photoacoustic spectrum | |
| CN109374529B (en) | Semi-open cavity resonance type photoacoustic cell | |
| CN111007014A (en) | First-order longitudinal full-resonance ellipsoidal cylindrical photoacoustic cell | |
| CN208937490U (en) | A kind of oil gas online detection instrument | |
| CN111413281B (en) | High-sensitivity telemetering type gas sensor | |
| CN114659988A (en) | Ellipsoidal resonance photoacoustic cell based on photoacoustic spectrum | |
| CN220730049U (en) | Miniature Raman probe | |
| CN219065274U (en) | Photoacoustic spectrum gas circulation detection system | |
| CN117007531B (en) | Gas concentration detection device and method based on Mie resonance transceiver pair |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |