Photoacoustic spectrum multi-component monitoring device

Abstract

The utility model relates to the technical field of photoacoustic spectrum monitoring, and discloses a photoacoustic spectrum multi-component monitoring device, which comprises a shell, an air inlet chamber and a buffer chamber are arranged in the shell, a communicated resonant cavity is arranged between the air inlet chamber and the buffer chamber, a microphone is arranged at the top end of the resonant cavity, and the air inlet chamber is communicated with the buffer chamber. The adjusting block and the buffer chamber slide in the air inlet and the buffer chamber respectively to adjust the air inlet flow and the size of the buffer area respectively, and the Brewster window is arranged to optimize the transmission path of the laser light source, reduce laser reflection and improve the quality of the laser light source. The device not only improves the sensitivity, accuracy and stability of gas monitoring, but also improves the use convenience and adaptability of the device, and solves some problems in a traditional device, such as low light source transmission efficiency, inaccurate gas flow control, gas pressure fluctuation and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to photoacoustic spectrum monitoring technical field, concretely is a kind of photoacoustic spectrum multi-component monitoring device. BACKGROUND

[0002] Photoacoustic spectrum monitoring is a kind of gas analysis technology based on photoacoustic effect (Photoacoustic Effect), is widely used in environmental monitoring, industrial process control, gas analysis, medical diagnosis and other fields. Through the technology, the composition in gas sample and its concentration can be detected and monitored very sensitively and accurately.

[0003] There are still some deficiencies in the existing photoacoustic spectrum monitoring technology, which affect the accuracy and sensitivity of detection. For example, the light source in the traditional device often cannot provide stable wavelength and light intensity, resulting in unstable photoacoustic signal. In addition, the flow control of gas sample is not accurate, and the photoacoustic effect in the photoacoustic cell cannot be fully utilized, which affects the detection sensitivity of low concentration gas. Especially in multi-component gas analysis, the absorption spectrum lines of different gases may overlap, and the signal is difficult to distinguish, increasing the complexity of analysis.

[0004] Therefore, it is necessary to design a photoacoustic spectrum multi-component monitoring device to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of photoacoustic spectrum multi-component monitoring device, for solving the technical problem proposed in the above background art.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme: a kind of photoacoustic spectrum multi-component monitoring device, including shell, the inside of the shell is provided with air inlet chamber and buffer chamber, and the air inlet chamber and buffer chamber are connected with resonant cavity, and the top of the resonant cavity is installed with microphone, and the outer surface of the shell is provided with Brewster window on air inlet chamber side, the adjacent side of the air inlet chamber and buffer chamber is respectively provided with air inlet and air outlet, and the top of the air inlet and air outlet is respectively connected with air inlet pipe and exhaust pipe, the inside of the air inlet is rotatably connected with first threaded rod, and one end of the first threaded rod penetrates the outside of shell, and one end of the first threaded rod is fixedly connected with first knob outside the shell, and the outer surface of the first threaded rod is threadedly sleeved with adjusting block, the both sides of the shell are installed with the symmetry of two exhaust valves, and the inside of two exhaust valves is communicated with air inlet chamber and buffer chamber respectively.

[0007] Preferably, the shape of the air inlet and the air outlet is L-shaped, and the width of the air inlet is greater than that of the air outlet, and the adjusting block is slidably arranged in the inside of the air inlet.

[0008] Preferably, the adjusting block is L-shaped, and the outer surface of the adjusting block is in close contact with the inner wall of the air inlet, and the top end of the adjusting block is in close contact with the bottom end of the air inlet pipe.

[0009] Preferably, the second threaded rod is rotatably connected inside the buffer chamber, one end of the second threaded rod penetrates outside the shell, a second knob is fixedly connected to the one end of the second threaded rod outside the shell, and the outer surface of the second threaded rod is threadedly sleeved with a sliding block.

[0010] Preferably, the sliding block is square-shaped, and the outer surface of the sliding block is in close contact with the inner surface of the first threaded rod.

[0011] Preferably, the top of the air inlet pipe and the air outlet pipe is provided with a piston block, the air inlet and the air outlet are located directly above the resonant cavity, and the air inlet and the air outlet are located on the two sides of the microphone, respectively.

[0012] Compared with the prior art, the technical scheme provided by the utility model has the beneficial effects as follows:

[0013] The utility model discloses a adjusting block and buffer chamber are slidably adjusted in air inlet and buffer chamber inside respectively, thereby respectively adjusting air intake and buffer area size, and through the setting of the Brewster window, the transmission path of the laser light source is optimized, laser reflection is reduced, thereby improving the light transmission efficiency of the system, the device not only improves the sensitivity, accuracy and stability of gas monitoring, but also improves the use convenience and adaptability of the device, solves some problems in the traditional device, such as low light source transmission efficiency, inaccurate gas flow control, gas pressure fluctuation and the like. ACCURACY

[0014] Fig. 1 It is the structural schematic diagram of the utility model;

[0015] Fig. 2 It is the exploded view of the shell structure of the utility model;

[0016] Fig. 3 It is the second threaded rod structure schematic diagram of the utility model;

[0017] In the drawing: 1, shell;2, Brewster window;3, exhaust valve;4, first knob;5, air inlet pipe;6, air outlet pipe;7, piston block;8, adjusting block;9, first threaded rod;10, air inlet;11, air outlet;12, air inlet chamber;13, buffer chamber;14, sliding block;15, second threaded rod;16, second knob;17, microphone;18, resonant cavity. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described in the following with reference to the drawings in the embodiments of the utility model.

[0019] Obviously, a lot of specific details are set forth in the following description in order to provide a thorough understanding of the utility model, but the utility model can also be implemented in other ways different from the description, therefore, the utility model is not limited to the specific embodiments disclosed in the following description.

[0020] Please refer to Figs. 1-3 The utility model provides a kind of photoacoustic spectrum multi-component monitoring device, the inside of the shell 1 is equipped with air inlet chamber 12 and buffer chamber 13, and the air inlet chamber 12 and buffer chamber 13 are equipped with the resonant cavity 18 that is connected in series between being equipped, and the top of the resonant cavity 18 is equipped with microphone 17, and the outer surface of the shell 1 is provided with Brewster window 2 on air inlet chamber 12 side, the adjacent side of the air inlet chamber 12 and buffer chamber 13 is equipped with air inlet 10 and air outlet 11 respectively, and the top of the air inlet 10 and air outlet 11 is connected with air inlet pipe 5 and exhaust pipe 6 respectively, the inside of the air inlet 10 is rotatably connected with first threaded rod 9, and one end of the first threaded rod 9 is penetrated to the outside of shell 1, and the first threaded rod 9 is fixedly connected with first knob 4 on the outside of shell 1, and the outer surface of the first threaded rod 9 is threadedly sleeved with adjusting block 8, the both sides of the shell 1 are equipped with the symmetrical two exhaust valves 3 of buffer chamber 13, and the inside of air inlet chamber 12 is communicated respectively, the device is provided with air inlet pipe 5 and exhaust pipe 6, so that gas enters from air inlet 10, and is discharged from buffer chamber 13, so as to utilize the gas communication of resonant cavity 18, when laser light source is aligned with Brewster window 2, gas is monitored and analyzed using microphone 17 for photoacoustic spectrum, in addition, the position arrangement between resonant cavity 18 and first threaded rod 9 significantly enhances photoacoustic effect, improves the sensitivity and accuracy of gas analysis, the flow of gas entering the inside of air inlet 10 can be adjusted by the sliding adjustment of adjusting block 8 in the inside of air inlet 10, Brewster window 2 is located at the entrance of shell 1, when laser irradiation, the setting of Brewster window 2 allows laser light source to pass through and interact with gas sample, optimizes the transmission path of laser light source, reduces laser reflection, thereby improves the light transmission efficiency of system, the setting of buffer chamber 13 is used for adjusting gas flow rate, stabilizing gas flow, ensuring the uniform distribution of gas in photoacoustic cell. It also helps to prevent the impact of sudden fluctuations or shock waves of gas on the system, and by the setting of two exhaust valves 3, the gas pressure inside air inlet chamber 12 or buffer chamber 13 can be adjusted at any time, through these technical improvements, photoacoustic spectrum monitoring device will be more accurate, efficient and flexible, so as to promote the wide application of the technology in the field of gas analysis.

[0021] In order to facilitate the air inlet and outlet of the device, the air inlet 10 and the air outlet 11 are both in the shape of L, and the width of the air inlet 10 is greater than that of the air outlet 11, and the adjusting block 8 is slidably arranged in the air inlet 10.

[0022] In order to facilitate the control of the gas flow into the air inlet 10 by the sliding arrangement of the adjusting block 8, the adjusting block 8 is in the shape of L, and the outer surface of the adjusting block 8 is in close contact with the inner wall of the air inlet 10, and the top end of the adjusting block 8 is in close contact with the bottom end of the air inlet pipe 5.

[0023] Further, in order to adjust the buffer size of the buffer chamber 13 by adjusting the internal space of the buffer chamber 13, the second threaded rod 15 is rotatably connected to the inside of the buffer chamber 13, and one end of the second threaded rod 15 penetrates the outside of the shell 1, and the second threaded rod 15 is fixedly connected with the second knob 16 at one end outside the shell 1, and the outer surface of the second threaded rod 15 is threadedly sleeved with the sliding block 14.

[0024] Further, in order to facilitate the stable sliding of the sliding block 14 and the adjustment of the buffer space inside the buffer chamber 13, the sliding block 14 is in the shape of a square, and the outer surface of the sliding block 14 is in close contact with the inside of the first threaded rod 9.

[0025] In order to close the inside of the device when it is not in use, and avoid internal pollution, the top of the air inlet pipe 5 and the exhaust pipe 6 is provided with a piston block 7, the air inlet 10 and the air outlet 11 are located directly above the resonant cavity 18, and the air inlet 10 and the air outlet 11 are respectively located on both sides of the microphone 17.

[0026] The preferred embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical scheme of the utility model within the technical concept of the utility model, and these simple modifications all belong to the protection scope of the utility model.

[0027] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the utility model will not further describe various possible combinations.

[0028] In addition, various different embodiments of the utility model can also be combined arbitrarily, as long as they do not deviate from the idea of the utility model, and they should also be considered as disclosed by the utility model.

Claims

1. A photoacoustic spectroscopy multi-component monitoring device comprising a housing (1), characterized in that: The inside of the shell (1) is provided with an air inlet chamber (12) and a buffer chamber (13), and a resonant cavity (18) is provided between the air inlet chamber (12) and the buffer chamber (13) and communicates with each other, and the top end of the resonant cavity (18) is provided with a microphone (17), and the outer surface of the shell (1) on one side of the air inlet chamber (12) is provided with a Brewster window (2), and the adjacent sides of the air inlet chamber (12) and the buffer chamber (13) are provided with an air inlet (10) and an air outlet (11), respectively, and the top end of the air inlet (10) and the air outlet (11) is respectively connected with an air inlet pipe (5) and an exhaust pipe (6), the inside of the air inlet (10) is rotatably connected with a first threaded rod (9), one end of the first threaded rod (9) penetrates the outside of the shell (1), and the first threaded rod (9) is fixedly connected with a first knob (4) at one end outside the shell (1), and the outer surface of the first threaded rod (9) is threadedly sleeved with an adjusting block (8), and the both sides of the shell (1) are provided with two symmetrical exhaust valves (3), and the two exhaust valves (3) respectively communicate with the inside of the air inlet chamber (12) and the buffer chamber (13).

2. The photoacoustic spectroscopy multi-component monitoring device according to claim 1, characterized in that: The shapes of the air inlet (10) and the air outlet (11) are both L-shaped, the width of the air inlet (10) is greater than that of the air outlet (11), and the adjusting block (8) is slidably arranged in the air inlet (10).

3. The photoacoustic spectroscopy multi-component monitoring device according to claim 1, characterized in that: The shape of the adjusting block (8) is L-shaped, the outer surface of the adjusting block (8) is fitted with the inner wall of the air inlet (10), and the top end of the adjusting block (8) is fitted with the bottom end of the air inlet pipe (5).

4. The photoacoustic spectroscopy multi-component monitoring device according to claim 1, characterized in that: The inside of the buffer chamber (13) is rotatably connected with a second threaded rod (15), one end of the second threaded rod (15) penetrates the outside of the shell (1), and the second threaded rod (15) is fixedly connected with a second knob (16) at one end outside the shell (1), and the outer surface of the second threaded rod (15) is threadedly sleeved with a sliding block (14).

5. A photoacoustic spectroscopy multi-component monitoring device according to claim 4, characterized in that: The shape of the sliding block (14) is square, and the outer surface of the sliding block (14) is fitted with the inside of the first threaded rod (9).

6. The photoacoustic spectroscopy multi-component monitoring device according to claim 1, characterized in that: The top of the air inlet pipe (5) and the exhaust pipe (6) is provided with a piston block (7), the air inlet (10) and the air outlet (11) are located directly above the resonant cavity (18), and the air inlet (10) and the air outlet (11) are located on both sides of the microphone (17).

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