A light-enhanced transparent photoacoustic cell and gas detection device for gas detection

Abstract

The utility model provides a kind of light enhancement type transparent photoacoustic cell and gas detection device for gas detection, comprising: transparent ellipsoidal photoacoustic resonant cavity, hole flat concave spherical mirror, flat concave spherical mirror, first buffer chamber and second buffer chamber;First buffer chamber and second buffer chamber are diametrically opposed to be arranged in transparent ellipsoidal photoacoustic resonant cavity both ends, and with transparent ellipsoidal photoacoustic resonant cavity intercommunication;Hole flat concave spherical mirror is arranged in the left end surface of first buffer chamber, and flat concave spherical mirror is arranged in the right end surface of second buffer chamber.The utility model uses transparent ellipsoidal photoacoustic resonant cavity, both can realize the full visualization adjustment of optical path, significantly simplify laser collimation and device debugging process, and can utilize ellipsoidal geometric characteristics optimization light field distribution and energy coupling efficiency.After setting high reflectivity hole flat concave spherical mirror in both ends of cavity, incident laser can form stable reflection path in cavity interior, to extend optical path and promote gas molecule absorption efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of gas detection technology, specifically relating to a light-enhanced transparent photoacoustic cell and a gas detection device for gas detection. Background Technology

[0002] Photoacoustic gas sensing technology is a rapidly developing indirect absorption spectroscopy technique in recent years. The core of this technology lies in the conversion of light radiation into sound. A modulated or pulsed beam of light of a specific wavelength is incident into a photoacoustic cell and interacts with a gas sample containing the target gas, causing gas molecules to transition from a low-energy state to an excited state through absorption. The excited-state molecules undergo non-radiative transitions through collisional relaxation, releasing heat and causing the temperature to rise. Periodic temperature changes cause the gas volume to periodically expand and contract, thus generating sound waves. The sound wave signal is detected by a microphone and demodulated by a signal processing unit to obtain relevant information about the gas sample. Photoacoustic gas sensing technology has advantages such as zero background, no wavelength selectivity, detection sensitivity proportional to excitation light power, small size, fast response, and low cost.

[0003] In photoacoustic spectroscopy gas detection systems, the gas's absorption efficiency of light energy determines the acoustic excitation intensity, while the length of the laser optical path directly affects the total absorption by gas molecules, thus influencing the intensity of the generated photoacoustic signal. According to Beer-Lambert's law, the absorption signal intensity is linearly proportional to the optical path. Therefore, under the condition of the same target gas concentration, extending the laser's propagation path in the gas (i.e., increasing the effective optical path) can significantly enhance the energy deposition efficiency per unit volume, thereby increasing the amplitude of the photoacoustic signal. In currently common photoacoustic cell structures (such as T-type and H-type), the laser typically propagates only along a single linear path within the cavity, resulting in a limited optical path, generally on the order of several centimeters to tens of centimeters, which severely restricts the detection sensitivity of weakly absorbing gases or low-concentration components.

[0004] To address this, the design concept of a light-enhanced photoacoustic cell has been proposed in recent years. Its core lies in introducing a set of reflective mirrors (such as plano-concave spherical mirrors, cylindrical mirrors, etc.) at both ends of the cavity, causing the laser to undergo multiple reflections within the photoacoustic cavity, thereby achieving a longer effective optical path within a limited volume. By doubling the optical path, the total energy absorbed by gas molecules per unit time increases, significantly improving the photoacoustic signal intensity and achieving a lower detection limit and higher sensitivity. Patent CN202510254935 proposes a light-enhanced photoacoustic spectroscopy gas detection system and method. This system collimates the incident laser through an optical fiber collimator, then sends it into the photoacoustic cell cavity through a perforated plano-concave cylindrical mirror. After multiple reflections between the photoacoustic resonator and the plano-concave spherical mirror, the laser exits through the original hole, achieving multiple effective reflections within the cavity, improving laser utilization efficiency, and enhancing the acoustic signal intensity. While this technology improves performance, it suffers from problems such as an excessively small resonant cavity diameter (5 mm) and difficulties in optical path alignment due to opaque materials. Furthermore, its resonant cavity still uses traditional materials, lacking adaptability to corrosive or high-humidity gas environments.

[0005] However, most existing photoacoustic cells with enhanced optical performance are made of metal or polymer materials. Their cavities are opaque, the laser path is not visible, adjustment is difficult, and optical path alignment relies on experience and multiple trial and error, which seriously affects debugging efficiency and system stability. At the same time, materials such as metals are prone to corrosion, contamination, and performance degradation when exposed to high humidity, acidic or corrosive gas environments, making it difficult to meet the requirements for long-term stable operation under complex conditions, thus limiting the application of photoacoustic cells in complex environments. Utility Model Content

[0006] To address the aforementioned problems in the existing technology, this utility model provides a light-enhanced transparent photoacoustic cell and a gas detection device for gas detection. The technical problem to be solved by this utility model is achieved through the following technical solution: In a first aspect, this utility model provides a light-enhanced transparent photoacoustic cell for gas detection, comprising: a transparent ellipsoidal photoacoustic resonant cavity, a perforated plano-concave spherical reflector, a plano-concave spherical reflector, a first buffer cavity, and a second buffer cavity. The first buffer cavity and the second buffer cavity are positioned opposite each other at both ends of the transparent ellipsoidal photoacoustic resonant cavity and are interconnected with the transparent ellipsoidal photoacoustic resonant cavity; the perforated plano-concave spherical reflector is positioned on the left end surface of the first buffer cavity, and the plano-concave spherical reflector is positioned on the right end surface of the second buffer cavity; a microphone is provided on the transparent ellipsoidal photoacoustic resonant cavity 1, an air inlet is provided on the first buffer cavity, and an air outlet is provided on the second buffer cavity.

[0007] Optionally, the transparent ellipsoidal photoacoustic resonator may be made of any one of quartz glass, fluoride glass, and sapphire.

[0008] Optionally, the microphone is connected to an external demodulation module, and the air inlet and the air outlet are connected to an external sampling device.

[0009] Optionally, the external demodulation module is connected to an external computing device.

[0010] Optionally, the microphone may be any one of a standing wave microphone, a MEMS sensor, or a piezoelectric ceramic sensor.

[0011] Secondly, this utility model provides a gas detection device for gas detection, characterized in that it includes a light-enhanced transparent photoacoustic cell for gas detection, a demodulation module, and a computing device connected in sequence; the light-enhanced transparent photoacoustic cell for gas detection includes a transparent ellipsoidal photoacoustic resonator, a perforated plano-concave spherical reflector, a plano-concave spherical reflector, a first buffer cavity, and a second buffer cavity. The first buffer cavity and the second buffer cavity are positioned opposite each other at both ends of the transparent ellipsoidal photoacoustic resonant cavity and are interconnected with the transparent ellipsoidal photoacoustic resonant cavity; the perforated plano-concave spherical reflector is disposed on the left end surface of the first buffer cavity, and the plano-concave spherical reflector is disposed on the right end surface of the second buffer cavity; a microphone is disposed on the transparent ellipsoidal photoacoustic resonant cavity, an air inlet is disposed on the first buffer cavity, and an air outlet is disposed on the second buffer cavity.

[0012] Optionally, the transparent ellipsoidal photoacoustic resonator may be made of any one of quartz glass, fluoride glass, and sapphire.

[0013] Optionally, the microphone is connected to the demodulation module, and the air inlet and the air outlet are connected to an external sampling device.

[0014] Optionally, the microphone may be any one of a standing wave microphone, a MEMS sensor, or a piezoelectric ceramic sensor.

[0015] Beneficial effects: 1. By combining a light-enhanced reflection structure with a transparent ellipsoidal cavity, this utility model's photoacoustic cell can maintain the stability of the laser's multiple reflection paths, effectively improving the photoacoustic signal coupling efficiency and detection sensitivity.

[0016] 2. This invention utilizes transparent quartz glass to construct a transparent ellipsoidal photoacoustic resonator, which possesses excellent optical transmittance. Furthermore, quartz material exhibits superior chemical stability and corrosion resistance, allowing for stable operation over extended periods in high humidity, acidic, or complex gas environments, thus solving the problems of easy corrosion and short lifespan associated with traditional metal cavities. Simultaneously, it enables visualization of the multiple laser reflection paths, significantly simplifying system debugging and laser coupling processes, and improving the convenience and accuracy of optical path calibration.

[0017] 3. The photoacoustic cell structure of this utility model has a compact design and small size, which can be easily integrated into various laser detection platforms. It is compatible with various types of lasers and signal acquisition modules, which is conducive to practical engineering deployment and mass production. It is suitable for complex working conditions such as high background interference, multi-component gas analysis and long-term online monitoring. It has good application prospects and promotion value in the fields of environmental monitoring, industrial emission control and safety early warning.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a light-enhanced transparent photoacoustic cell for gas detection provided by this utility model; Figure 2 This is a schematic diagram of the sound pressure signal distribution of a light-enhanced transparent photoacoustic cell for gas detection provided by this utility model. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0021] This invention aims to provide a light-enhanced transparent photoacoustic cell and gas detection device for gas detection, solving problems such as invisible optical path, difficult alignment, opaque structure, complex debugging, and poor material corrosion resistance in existing light-enhanced photoacoustic cells. Existing photoacoustic cells often use metals or opaque materials when constructing the light-enhancing structure, making the laser path inside the cavity impossible to observe, leading to difficulties in optical path debugging and affecting system stability and detection sensitivity. Furthermore, traditional materials are prone to aging or corrosion in high-humidity, acidic, or corrosive gas environments, limiting the long-term use of the device under complex conditions. Therefore, this invention uses transparent quartz glass to fabricate an ellipsoidal resonant cavity, combined with a plano-concave spherical mirror to achieve multiple effective reflections of the laser within the transparent cavity, thereby significantly improving laser utilization and photoacoustic signal intensity. This transparent ellipsoidal structure not only enhances light focusing and reflection efficiency but also makes the internal optical path visible, facilitating rapid adjustment and precise alignment. Quartz glass possesses excellent optical transmittance, thermal stability, and chemical corrosion resistance, greatly improving the adaptability and long-term stability of the photoacoustic cell in complex gas environments. This invention can be widely applied to industrial online monitoring, environmental detection, and high-precision laboratory gas analysis, achieving highly sensitive and reliable gas concentration detection.

[0022] like Figure 1 As shown, this utility model provides a light-enhanced transparent photoacoustic cell for gas detection, comprising: a transparent ellipsoidal photoacoustic resonator 1, a perforated plano-concave spherical reflector 2, a plano-concave spherical reflector 3, a first buffer cavity 4, and a second buffer cavity 5; The first buffer cavity 4 and the second buffer cavity 5 are positioned opposite each other at both ends of the transparent ellipsoidal photoacoustic resonant cavity 1 and are interconnected with the transparent ellipsoidal photoacoustic resonant cavity 1; the perforated plano-concave spherical reflector 2 is disposed on the left end surface of the first buffer cavity 4, and the plano-concave spherical reflector 3 is disposed on the right end surface of the second buffer cavity 5; a microphone 6 is disposed on the transparent ellipsoidal photoacoustic resonant cavity 1, an air inlet 7 is disposed on the first buffer cavity 4, and an air outlet 8 is disposed on the second buffer cavity 5.

[0023] The microphone 6 is connected to an external demodulation module, and the air inlet 7 and air outlet 8 are connected to an external sampling device. The external demodulation module is connected to an external computing device. The microphone 6 is any one of a standing wave microphone, a MEMS sensor, or a piezoelectric ceramic sensor.

[0024] The photoacoustic cell of this utility model consists of a perforated plano-concave spherical reflector, a plano-concave spherical reflector, a transparent ellipsoidal photoacoustic resonant cavity, a first buffer cavity, a second buffer cavity, an air inlet, an air outlet, and a microphone. A perforated plano-concave spherical mirror serves as the laser incident component, used to collimate the laser beam into the resonant cavity. The mirror surface has openings to facilitate laser transmission and subsequent use. The plano-concave spherical mirror, located at the other end of the photoacoustic cell, features a highly reflective curved surface structure, enabling multiple effective reflections of the laser within the cavity and improving photoacoustic conversion efficiency. The transparent ellipsoidal photoacoustic resonant cavity is made of quartz glass, possessing excellent optical transmittance and corrosion resistance, ensuring stable laser propagation and enhancing the system's environmental adaptability. Buffer cavities are located at both ends of the resonant cavity, connecting to the main gas flow path, effectively suppressing airflow disturbances and background noise, and enhancing system signal stability. Gas inlets are used for gas introduction and discharge, ensuring uniform entry of the measured gas into the resonant cavity and maintaining stable sampling conditions. A microphone is installed near the resonant cavity to receive the photoacoustic signal generated after the measured gas absorbs the laser beam and converts it into an electrical signal for subsequent processing.

[0025] The transparent ellipsoidal photoacoustic resonant cavity 1 has a hollow tubular structure, with its two ends connected to two first buffer cavities 4 and a second buffer cavity 5 respectively via sealed connectors. High-reflectivity spherical mirrors are installed at the outer ends of the two buffer cavities. One end of the mirror is a perforated plano-concave spherical mirror 2 for laser incident light; the other end is a non-perforated plano-concave spherical mirror 3 for reflecting the laser to form a multiple reflection path. A microphone 6 is located near the center of the resonant cavity sidewall, with its acoustic surface facing the inside of the cavity. Its output is connected to a signal demodulation module via a wire. An air inlet 7 and an air outlet 8 are respectively located on the sides of the first buffer cavity 4 and the second buffer cavity 5, and are connected to an external gas source or sampling device via pipelines, forming a complete flow path.

[0026] The collimated laser beam output from the modulated laser is aligned with the central hole of the perforated plano-concave spherical mirror 2. The mirror frame is precisely adjusted to ensure the laser enters the transparent ellipsoidal photoacoustic resonant cavity 1 at a specific angle, ensuring the optical path length during reflection within the cavity meets requirements. Under the influence of the perforated plano-concave spherical mirror 2 and the plano-concave spherical mirror 3, the laser forms multiple round-trip reflection paths within the cavity, achieving light enhancement and significantly increasing the interaction length between the laser and the gas being tested, thereby improving signal strength. The gas being tested is introduced through the inlet 7 and flows along the resonant cavity to the outlet 8, interacting with the laser during its flow. The presence of a first buffer cavity 4 and a second buffer cavity 5 at both ends effectively suppresses airflow disturbances and background aerodynamic noise, ensuring stable gas flow and enhancing signal detection stability. After gas molecules absorb the laser, they induce periodic local heating, which in turn excites the acoustic resonance mode in the resonant cavity. The acoustic wave is received by microphone 6 and converted into an electrical signal, which is transmitted to lock-in amplifier and coherently demodulated with the modulation reference signal to extract the first or second harmonic signal containing gas concentration information. Finally, the local computing device performs concentration inversion based on the preset gas absorption coefficient and system response model to obtain the concentration information analysis results of the target gas.

[0027] This invention combines a light-enhanced reflective structure with a transparent ellipsoidal cavity. Because the photoacoustic cell can maintain the stability of the laser's multiple reflection paths, it effectively improves the photoacoustic signal coupling efficiency and detection sensitivity.

[0028] In one specific embodiment of this utility model, the transparent ellipsoidal photoacoustic resonant cavity 1 is made of any one of quartz glass, fluoride glass, and sapphire.

[0029] The key to this invention lies in the optimization of the photoacoustic resonator materials and structure based on existing optical enhancement structures. By using high-transmittance, corrosion-resistant quartz glass to fabricate a transparent ellipsoidal photoacoustic resonator, the laser path can be visualized and adjusted while maintaining the laser's multiple reflection enhancement effect. This significantly reduces the difficulty of system debugging and improves the stability and coupling efficiency of the photoacoustic signal. Compared to traditional photoacoustic cells using opaque and easily corroded materials, the quartz cavity possesses superior chemical stability and environmental adaptability, enabling long-term stable operation in complex gas environments such as high humidity and high corrosiveness. This invention, combined with existing optical enhancement mirror assembly structures, improves the system's practicality and reliability in engineering applications through material and structural optimization without altering the laser enhancement mechanism. It is suitable for gas detection in high-precision, multi-component, or high-background-interference scenarios and has promising prospects for widespread application.

[0030] This invention uses quartz glass as the main cavity material, leveraging its high light transmittance, excellent thermal stability, and corrosion resistance to construct a transparent ellipsoidal photoacoustic resonant cavity. This ellipsoidal structure differs from traditional cylindrical cavities, improving the spatial coupling efficiency of photoacoustic energy through geometric focusing effects, while maintaining multiple effective reflections and stable propagation of the laser within the cavity. The transparent cavity structure design makes the laser path propagation process within the resonant cavity clearly visible, facilitating precise optical path adjustment and stable operation, thereby enhancing the system's debuggability, repeatability, and signal stability.

[0031] This invention emphasizes material substitutability. While maintaining optical transmittance and mechanical strength of the cavity, other transparent materials with corrosion resistance, such as fluoride glass and sapphire, can also be used for manufacturing.

[0032] This utility model has good system compatibility and can be connected with various wavelength laser sources, laser modulation methods and signal demodulation systems. It can upgrade the structure without changing the existing laser and optical path layout, thereby enhancing the system's adaptability and promotional value.

[0033] The photoacoustic cell provided by this utility model is suitable for various complex gas detection scenarios, such as high humidity, high corrosiveness, and severe cross-interference environments. It has broad engineering application potential. Any engineering implementation scheme that applies the structure of this utility model to such gas detection systems is applicable.

[0034] Secondly, this utility model provides a gas detection device for gas detection, comprising a light-enhanced transparent photoacoustic cell, a demodulation module, and a computing device connected in sequence for gas detection; the light-enhanced transparent photoacoustic cell for gas detection includes a transparent ellipsoidal photoacoustic resonator 1, a perforated plano-concave spherical reflector 2, a plano-concave spherical reflector 3, a first buffer cavity 4, and a second buffer cavity 5. The first buffer cavity 4 and the second buffer cavity 5 are positioned opposite each other at both ends of the transparent ellipsoidal photoacoustic resonant cavity 1 and are interconnected with the transparent ellipsoidal photoacoustic resonant cavity 1; the perforated plano-concave spherical reflector 2 is disposed on the left end surface of the first buffer cavity 4, and the plano-concave spherical reflector 3 is disposed on the right end surface of the second buffer cavity 5; a microphone 6 is disposed on the transparent ellipsoidal photoacoustic resonant cavity 1, an air inlet 7 is disposed on the first buffer cavity 4, and an air outlet 8 is disposed on the second buffer cavity 5.

[0035] The microphone 6 is connected to the demodulation module, and the air inlet 7 and the air outlet 8 are connected to an external sampling device. The microphone 6 is any one of a standing wave microphone, a MEMS sensor, or a piezoelectric ceramic sensor.

[0036] The gas detection process includes: aligning the collimated laser beam output from the modulated laser with the central hole of the perforated plano-concave spherical mirror 2; and precisely adjusting the mirror frame to allow the laser to enter the transparent ellipsoidal photoacoustic resonant cavity 1 at a certain angle. Under the action of the perforated plano-concave spherical mirror 2 and the plano-concave spherical mirror 3, the laser forms multiple back-and-forth reflection paths within the cavity, achieving light enhancement and significantly increasing the interaction length between the laser and the gas to be tested, thereby improving signal strength. The gas to be tested is introduced through the inlet 7 and flows along the resonant cavity to the outlet 8, interacting with the laser during its flow. The presence of a first buffer cavity 4 and a second buffer cavity 5 at both ends effectively suppresses airflow disturbances and background aerodynamic noise, ensuring stable gas flow and enhancing signal detection stability. After gas molecules absorb the laser, they induce periodic local heating, which in turn excites the acoustic resonance mode in the resonant cavity. The acoustic wave is received by microphone 6 and converted into an electrical signal, which is transmitted to lock-in amplifier and coherently demodulated with the modulation reference signal to extract the first or second harmonic signal containing gas concentration information. Finally, the local computing device performs concentration inversion based on the preset gas absorption coefficient and system response model to obtain the concentration information analysis results of the target gas.

[0037] In one specific embodiment, the transparent ellipsoidal photoacoustic resonant cavity 1 is made of any one of quartz glass, fluoride glass, and sapphire.

[0038] The key to this invention lies in introducing a transparent ellipsoidal resonant cavity, fabricated using quartz glass, based on existing optical enhancement structures. This achieves optimized visualization of the optical path and photoacoustic energy coupling. By using high-transmittance, corrosion-resistant quartz glass to fabricate the transparent ellipsoidal photoacoustic resonant cavity, the laser path can be visualized and adjusted while maintaining the laser's multiple reflection enhancement effect. This significantly reduces the difficulty of system debugging and improves the stability and coupling efficiency of the photoacoustic signal. Compared to traditional cylindrical cavities using opaque, easily corroded materials, the ellipsoidal cavity can better converge the sound and light fields, improving the intensity and stability of the photoacoustic signal. Simultaneously, quartz glass possesses excellent corrosion resistance, allowing for long-term stable operation in high-humidity and highly corrosive gas environments. This invention, combined with existing optical enhancement mirror structures, improves the system's practicality and reliability in engineering applications through material and structural optimization without altering the laser enhancement mechanism. It is suitable for gas detection in high-precision, multi-component, or high-background-interference scenarios and has promising prospects for widespread application.

[0039] This invention uses quartz glass to prepare a transparent ellipsoidal resonant cavity, which has both excellent optical transmittance and corrosion resistance, enabling visual adjustment of the laser path and high environmental adaptability.

[0040] This invention improves the cavity material and structure based on the existing optical path design of the photoacoustic cell. The transparent design greatly enhances the visibility of laser incidence and adjustment, and significantly simplifies the system debugging and calibration process. The related transparent cavity structure and adjustment method are all within the protection scope of this invention.

[0041] This invention emphasizes material substitutability. While maintaining optical transmittance and mechanical strength of the cavity, other transparent materials with corrosion resistance, such as fluoride glass and sapphire, can also be used for manufacturing.

[0042] This utility model has good system compatibility and can be connected with various wavelength laser sources, laser modulation methods and signal demodulation systems. It can upgrade the structure without changing the existing laser and optical path layout, thereby enhancing the system's adaptability and promotional value.

[0043] The gas detection device provided by this utility model is suitable for various complex gas detection scenarios, such as environmental conditions with high humidity, high corrosiveness, and severe cross-interference. It has broad engineering application potential. Any engineering implementation scheme that applies the structure of this utility model to such gas detection systems is applicable.

[0044] To verify the performance advantages of this invention, finite element simulations were performed on three different photoacoustic cell structures using COMSOL Multiphysics software. The simulation parameters were set as follows: the resonant cavity of the ordinary H-type photoacoustic cell had a length of 40 mm and a radius of 4 mm, while the buffer cavity had a length of 10 mm and a radius of 10 mm. The light-enhanced photoacoustic cell maintained the same dimensions, but added spherical high-reflectivity mirrors at both ends of the cavity, causing the laser to reflect multiple times within the cavity, increasing the optical path by approximately five times compared to the H-type photoacoustic cell. Simulation results showed that the sound pressure signal intensity increased by approximately five times accordingly. Based on this, the light-enhanced transparent ellipsoidal photoacoustic cell proposed in this invention further changed the resonant cavity from a cylinder to a transparent ellipsoid, and adjusted the ellipsoid's geometric dimensions to maintain a resonant frequency similar to the previous two. Simulation results showed that the sound pressure signal was enhanced by approximately 1.85 times compared to the light-enhanced photoacoustic cell. In summary, compared to the traditional H-type photoacoustic cell, the sound pressure signal intensity of the photoacoustic cell described in this invention is increased by approximately 9.25 times. The simulated sound pressure signal distribution is shown below. Figure 2 As shown, the differences in sound pressure intensity between different structured photoacoustic cells and the signal enhancement effect brought about by this invention can be intuitively reflected.

[0045] Through the above structural design and implementation methods, this utility model not only achieves visual adjustment of the optical path in terms of structure, reducing the difficulty of optical path alignment, but also ensures long-term stable operation in complex gas environments by utilizing the high light transmittance and excellent corrosion resistance of quartz glass. In terms of performance, simulation results show that the acoustic pressure signal is significantly improved through the coupling of the transparent ellipsoidal resonant cavity and the light-enhancing reflection structure, providing a reliable design basis and technical solution for high-sensitivity gas detection under complex working conditions.

[0046] It is worth noting that the terms "first" and "second" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A light-enhanced transparent photoacoustic cell for gas detection, characterized in that, include: Transparent ellipsoidal photoacoustic resonator (1), perforated plano-concave spherical reflector (2), plano-concave spherical reflector (3), first buffer cavity (4), and second buffer cavity (5); The first buffer cavity (4) and the second buffer cavity (5) are positioned opposite each other at both ends of the transparent ellipsoidal photoacoustic resonant cavity (1) and are interconnected with the transparent ellipsoidal photoacoustic resonant cavity (1); the perforated plano-concave spherical reflector (2) is positioned on the left end surface of the first buffer cavity (4), and the plano-concave spherical reflector (3) is positioned on the right end surface of the second buffer cavity (5); a microphone (6) is provided on the transparent ellipsoidal photoacoustic resonant cavity (1), an air inlet (7) is provided on the first buffer cavity (4), and an air outlet (8) is provided on the second buffer cavity (5).

2. The light-enhanced transparent photoacoustic cell for gas detection according to claim 1, characterized in that, The transparent ellipsoidal photoacoustic resonant cavity (1) is made of any one of quartz glass, fluoride glass and sapphire.

3. The light-enhanced transparent photoacoustic cell for gas detection according to claim 1, characterized in that, The microphone (6) is connected to an external demodulation module, and the air inlet (7) and the air outlet (8) are connected to an external sampling device.

4. The light-enhanced transparent photoacoustic cell for gas detection according to claim 3, characterized in that, The external demodulation module is connected to an external computing device.

5. The light-enhanced transparent photoacoustic cell for gas detection according to claim 1, characterized in that, The microphone (6) is any one of a standing wave microphone, a MEMS sensor, or a piezoelectric ceramic sensor.

6. A gas detection device for gas detection, characterized in that, It includes a light-enhanced transparent photoacoustic cell for gas detection, a demodulation module, and a computing device connected in sequence; the light-enhanced transparent photoacoustic cell for gas detection includes a transparent ellipsoidal photoacoustic resonator (1), a perforated plano-concave spherical mirror (2), a plano-concave spherical mirror (3), a first buffer cavity (4), and a second buffer cavity (5); The first buffer cavity (4) and the second buffer cavity (5) are positioned opposite each other at both ends of the transparent ellipsoidal photoacoustic resonant cavity (1) and are interconnected with the transparent ellipsoidal photoacoustic resonant cavity (1); the perforated plano-concave spherical reflector (2) is positioned on the left end surface of the first buffer cavity (4), and the plano-concave spherical reflector (3) is positioned on the right end surface of the second buffer cavity (5); a microphone (6) is provided on the transparent ellipsoidal photoacoustic resonant cavity (1), an air inlet (7) is provided on the first buffer cavity (4), and an air outlet (8) is provided on the second buffer cavity (5).

7. The gas detection device for gas detection according to claim 6, characterized in that, The transparent ellipsoidal photoacoustic resonant cavity (1) is made of any one of quartz glass, fluoride glass and sapphire.

8. The gas detection device for gas detection according to claim 6, characterized in that, The microphone (6) is connected to the demodulation module, and the air inlet (7) and the air outlet (8) are connected to an external sampling device.

9. The gas detection device for gas detection according to claim 6, characterized in that, The microphone (6) is any one of a standing wave microphone, a MEMS sensor, or a piezoelectric ceramic sensor.

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