LED array multi-gas detection device

Abstract

The utility model discloses an LED (light-emitting diode) array multi-gas detection device which comprises a shell, a bottom plate arranged at the bottom of the shell, and an acousto-optic cavity component mounted on the bottom plate, the acousto-optic cavity assembly comprises two lens supports which are arranged in an aligned mode, and lenses are installed in the lens supports. The acousto-optic cavity assembly further comprises a tuning fork base, the tuning fork base is arranged between the two lenses, and a tuning fork is vertically installed in the tuning fork base. An LED lamp is installed in the shell and located at one end of the acousto-optic cavity assembly, light emitted by the LED lamp passes through a lens and irradiates gas around the tuning fork to generate a photoacoustic signal, and the tuning fork collects the photoacoustic signal for detection.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas detection, and particularly relates to an LED array multi-gas detection device. Background Art

[0002] Photoacoustic spectroscopy technology is an advanced spectroscopic detection method based on the photoacoustic effect. It belongs to a part of the spectroscopy field. Different from traditional spectroscopic analysis technologies, photoacoustic spectroscopy does not measure the optical signals after the interaction between light and gas molecules or atoms, but captures the vibration acoustic wave signals generated when these molecules or atoms absorb photons and undergo energy level transitions to improve the detection sensitivity.

[0003] To achieve gas detection, a quantum cascade laser gas detector has been proposed, which uses the method of emitting laser irradiation for detection. Since the laser is installed on the gas detection device, it has a large volume and a high cost. Content of the Utility Model

[0004] The purpose of the utility model is to provide an LED array multi-gas detection device, which integrates LED lights on the gas detection device to emit light, reduces the volume of the gas detection device, and lowers the cost.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An LED array multi-gas detection device includes a housing, a bottom plate is arranged at the bottom of the housing, and further includes an acousto-optic cavity assembly, and the acousto-optic cavity assembly is installed on the bottom plate;

[0007] The acousto-optic cavity assembly includes two lens brackets placed in alignment, and lenses are installed in the lens brackets; the acousto-optic cavity assembly further includes a tuning fork base, the tuning fork base is arranged between the two lenses, and a tuning fork is vertically installed in the tuning fork base;

[0008] An LED light is installed inside the housing and at one end of the acousto-optic cavity assembly, and the light emitted by the LED light irradiates the gas around the tuning fork through one of the lenses to generate a photoacoustic signal, and the tuning fork collects the photoacoustic signal for detection.

[0009] Preferably, a plurality of the acousto-optic cavity assemblies are installed inside the housing; a plurality of LED lights are arranged inside the housing; the LED lights and the acousto-optic cavity assemblies are in one-to-one correspondence.

[0010] Preferably, the LED light can alternately emit lights of multiple colors, and lights of various colors correspond to different wavelengths for detecting various different gases.

[0011] Preferably, within one of the acousto-optic cavity assemblies, four screws are respectively installed at the four corners of two lens brackets (11) to fix the two lens brackets together.

[0012] Preferably, a light source path simulator is installed on each side of the lens bracket; after the light emitted by the LED lamp is converged by the light source path simulator, it irradiates the gas around the tuning fork.

[0013] Preferably, a fixing base is installed on the bottom plate, and the tuning fork is installed on the fixing base.

[0014] The beneficial effects of the present utility model are as follows:

[0015] An LED lamp is installed inside the housing, and the LED lamp is located at one end of the acousto-optic cavity assembly. The light emitted by the LED lamp irradiates the gas around the tuning fork through one of the lenses to generate a photoacoustic signal, and the tuning fork collects the photoacoustic signal for detection.

[0016] Let the LED light irradiate into the gas in the photoacoustic cavity. Since the absorption peak of each gas is different, it will only respond to light of the corresponding wavelength. According to the absorption peak of the gas, the corresponding wavelength of light emitted by the LED is adjusted so that the corresponding gas responds to achieve the detection of this type of gas.

[0017] By using the light emitted by the LED lamp for detection, compared with a laser emitter, the LED lamp is integrated inside the LED array multi-gas detection device. Replacing the QCL quantum cascade laser with the LED lamp can reduce the volume of the gas detection device, and the cost of the LED lamp is lower than that of the QCL quantum cascade laser. Description of the Drawings

[0018] Figure 1 An exploded view of the LED array multi-gas detection device as viewed from one perspective;

[0019] Figure 2 An exploded view of the LED array multi-gas detection device as viewed from another perspective;

[0020] Figure 3 A schematic diagram of multi-gas detection achieved through an LED array.

[0021] Reference Numerals:

[0022] 1. Housing; 2. Bottom plate; 3. Screw; 4. LED lamp; 5. Main control unit; 6. Lens; 7. Light source path simulator; 8. Tuning fork; 9. Tuning fork base 10. Fixing base; 11. Lens bracket. Detailed Description of the Invention

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0024] To achieve the detection of gases, a quantum cascade laser gas detector is proposed, which uses the method of emitting laser irradiation for detection. Since the laser is installed on the gas detection device, it is very large in volume and the cost of the laser is very high.

[0025] In view of the above technical problems, referring to Figure 1 and Figure 2 , this embodiment provides an LED array multi-gas detection device, including a housing 1. A bottom plate 2 is provided at the bottom of the housing 1, and it further includes an acousto-optic cavity assembly, and the acousto-optic cavity assembly is installed on the bottom plate 2.

[0026] Referring to Figure 1 , the acousto-optic cavity assembly includes two lens brackets 11 placed in alignment. A lens 6 is installed in the lens bracket 11, and the lens 6 is used to converge light.

[0027] The acousto-optic cavity assembly further includes a tuning fork base 9. The tuning fork base 9 is disposed between the two lenses 6, and a tuning fork 8 is vertically installed in the tuning fork base 9. The tuning fork 8 is located between the two lenses 6.

[0028] An LED lamp 4 is installed inside the housing 1, and the LED lamp 4 is located at one end of the acousto-optic cavity assembly. The light emitted by the LED lamp 4 irradiates the gas around the tuning fork 8 through one of the lenses 6 to generate a photoacoustic signal, and the tuning fork 8 collects the photoacoustic signal for detection.

[0029] Specifically, photoacoustic spectroscopy is an advanced spectroscopic detection method based on the photoacoustic effect. It belongs to a part of the field of spectroscopy. Different from traditional spectroscopic analysis techniques, photoacoustic spectroscopy does not measure the optical signal after the interaction between light and gas molecules or atoms, but captures the vibration acoustic wave signal generated when these molecules or atoms absorb photons and undergo energy level transitions, that is, the photoacoustic signal.

[0030] Let the LED light irradiate into the gas in the photoacoustic cavity. Since the absorption peak of each gas is different, it will only respond to light of the corresponding wavelength. According to the absorption peak of the gas, the LED is adjusted to emit light of the corresponding wavelength, so that the corresponding gas responds to achieve the detection of this type of gas.

[0031] By using the LED lamp to emit light for detection, compared with the laser emitter, the LED lamp has lower requirements for the power supply, thereby reducing the requirements of the LED array multi-gas detection device for the power supply and reducing the cost.

[0032] Reference Figure 1 , a plurality of the acousto-optic cavity components are installed in the housing 1, and a plurality of LED lights 4 are arranged inside the housing 1, and the LED lights 4 and the acousto-optic cavity components are in one-to-one correspondence.

[0033] The LED lights 4 can alternately emit lights of multiple colors, and lights of various colors correspond to different wavelengths, which are used to detect various different gases.

[0034] When the gas contains multiple gases, the LED lights are adjusted to emit lights of multiple different bands, and the gases are irradiated in sequence by the LED lights of multiple different bands. Among them, when a gas is irradiated by the light of one band, the corresponding gas responds to generate an optoacoustic signal, and the tuning fork 8 collects the corresponding optoacoustic signal to measure the concentration of this type of gas. Measuring the concentration of a gas by collecting an optoacoustic signal through an acousto-optic reaction is an existing technology in the art and will not be elaborated in detail.

[0035] The LED lights emit lights of multiple different bands and irradiate the gas in sequence, so that the concentrations of multiple gases can be detected.

[0036] Reference Figure 3 , a schematic diagram of detecting multiple gases by arranging a plurality of LED lights in an array form.

[0037] For a plurality of LED light arrays, optoacoustic signals of multiple gases can be collected. The concentrations of multiple gases can be collected in a complex atmosphere environment.

[0038] Reference Figure 2 , in one of the acousto-optic cavity components, four screw rods 3 are respectively installed at four included angles of two lens brackets 11 to fix the two lens brackets 11 together, so as to firmly fix the two lenses 2 together and improve the structural stability. Moreover, the four screw rods 3 can align the two lens brackets 11 axially along the axial direction.

[0039] Reference Figure 1 , a light source path simulator 7 is respectively installed on both sides of the lens bracket 11,

[0040] The light source path simulator 7 is conical in shape, and the inside is a conical cavity. Light travels along the inside of the light source path simulator 7 for converging light.

[0041] The light emitted by the LED lights 4 is converged by the light source path simulator 7 and then irradiates the gas around the tuning fork 8.

[0042] A fixing seat 10 is installed on the bottom plate 2 with bolts, and the tuning fork 8 is installed on the fixing seat 10.

[0043] The main control unit 5 is installed inside the housing 1. The main control unit 5 is implemented by a digital signal processor (DSP). Specifically, the DSP processor TMS320LF286 chip is used as the main control chip.

[0044] Working principle:

[0045] (1) An LED lamp 4 is installed inside the housing 1, and the LED lamp 4 is located at one end of the acousto-optic cavity assembly. The light emitted by the LED lamp 4 irradiates the gas around the tuning fork 8 through a lens 6 to generate a photoacoustic signal, and the tuning fork 8 collects the photoacoustic signal for detection.

[0046] Let the LED light irradiate into the gas in the photoacoustic cavity. Since the absorption peak of each gas is different, it will only respond to light of the corresponding wavelength. According to the absorption peak of the gas, adjust the light of the corresponding wavelength emitted by the LED to make the corresponding gas respond, so as to realize the detection of this type of gas.

[0047] By using the LED lamp to emit light for detection, compared with a laser emitter, the LED lamp is integrated inside the LED array multi-gas detection device. Replacing the QCL quantum cascade laser with the LED lamp can reduce the volume of the gas detection device, and the cost of the LED lamp is lower than that of the QCL quantum cascade laser.

[0048] (2) When the gas contains multiple gases, adjust the LED lamp to emit light of multiple different bands. The LED lights of multiple different bands irradiate the gas in turn. Among them, when a gas is irradiated by light of a certain band, the corresponding gas responds to generate a photoacoustic signal, and the tuning fork 8 collects the corresponding photoacoustic signal to measure the concentration of this type of gas. The LED lamp emits light of multiple different bands and irradiates the gas in turn, so that the concentration of multiple gases can be detected.

[0049] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An LED array multi-gas detection device, comprising a housing (1), a bottom plate (2) being arranged at the bottom of the housing (1), characterized in that , further comprising an acousto-optic cavity assembly, wherein the acousto-optic cavity assembly is mounted on the bottom plate (2); The acousto-optic cavity assembly comprises two lens brackets (11) placed in an aligned manner, and a lens (6) is installed in the lens bracket (11); the acousto-optic cavity assembly also comprises a tuning fork base (9), and the tuning fork base (9) is arranged between the two lenses (6), and a tuning fork (8) is vertically installed in the tuning fork base (9); An LED lamp (4) is installed inside the housing (1) and is located at one end of the acousto-optic cavity assembly; the light emitted by the LED lamp (4) passes through a lens (6) and irradiates the gas around the tuning fork (8) to generate a photoacoustic signal; the tuning fork (8) collects the photoacoustic signal for detection.

2. According to claim 1, the LED array multi-gas detection device is characterized in that , a plurality of the acousto-optic cavity components are installed in the housing (1); a plurality of LED lamps (4) are arranged inside the housing (1); and the LED lamps (4) correspond one to one with the acousto-optic cavity components.

3. According to claim 2, the LED array multi-gas detection device is characterized in that The LED lamp (4) can emit light of multiple colors in turn, and each color of light corresponds to a different wavelength, which is used to detect various gases.

4. The LED array multi-gas detection device according to claim 1 is characterized in that In one of the acousto-optic cavity components, four screws (3) are respectively installed at four angles of two lens supports (11) to fix the two lens supports (11) together.

5. The LED array multi-gas detection device according to claim 1 is characterized in that A light source path simulator (7) is installed on each side of the lens bracket (11); the light emitted by the LED lamp (4) is converged by the light source path simulator (7) and then irradiated to the gas around the tuning fork (8).

6. The LED array multi-gas detection device according to claim 1 is characterized in that A fixing seat (10) is mounted on the bottom plate (2), and the tuning fork (8) is mounted on the fixing seat (10).

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