Spectral smell recognition module

Abstract

The invention belongs to the technical field of spectrum detection, and particularly relates to a spectrum smell recognition module which comprises a light source device, a first concave reflector assembly, a second concave reflector assembly, two angle-adjustable reflectors and a spectrum sensor assembly. A gas spectrum absorption cell and a gas spectrum reference cell are formed between the first concave reflector and the second concave reflector, a transparent optical window is arranged between the gas spectrum absorption cell and the gas spectrum reference cell for isolation, and an angle-adjustable reflector is arranged at each of the two ends of the gas spectrum reference cell; by synchronously switching the angles of the two angle-adjustable reflectors, the real-time switching of the spectrum smell recognition module between the gas spectrum absorption cell and the gas spectrum reference cell is realized, and the intensity of the gas spectrum absorption signal is superposed and accumulated through multiple times of switching to carry out spectrum signal analysis. According to the invention, the intensity of a gas spectrum absorption signal and the accuracy and stability of a spectrum signal are improved, and meanwhile, the self-calibration function of the spectrum smell recognition module is also realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of spectrum detection, and in particular relates to a spectrum odor recognition module. Background Art

[0002] Spectral detection has the advantages of being fast, non-destructive, and green, and is widely used in chemistry, biology, materials, agriculture, geology and other fields. Traditional spectral detection is mainly used for solid and liquid detection, but rarely involves odor detection. The main reason is that the content of odor components is low, which exceeds the sensitivity range of spectral detection and is difficult to detect. For this reason, a laser light source with very high collimation is usually used. Through multiple reflections through multiple mirrors designed in the air chamber, a folded light path of more than 2000 meters is formed to increase the content of odor components by extending the optical path, thereby realizing spectral odor detection. However, this method requires a laser light source with very stable wavelength and power, which is costly, complex laser signal control and processing, and large in size, which limits the application scenarios of spectral odor recognition. Summary of the invention

[0003] The purpose of the present invention is to provide a spectral odor recognition module that can achieve accurate analysis of odors without the need for expensive and complex laser light sources, thereby solving the shortcomings of the above-mentioned prior art caused by multiple reflections through multiple mirrors to form a folded light path of more than 2000 meters, and having the advantages of small size, simple structure, low cost, high sensitivity, etc.

[0004] To achieve the above object, the present invention adopts the following technical solution: A spectral odor recognition module comprises: a light source component, a transparent optical window, a first concave reflector component, a second concave reflector component, and a spectral sensor component; The light source assembly is used to emit light for spectral analysis; A gas spectrum absorption cell and a gas spectrum reference cell are formed between the first concave reflector assembly and the second concave reflector assembly, and a transparent optical window for isolating the gas spectrum absorption cell and the gas spectrum reference cell is provided between the gas spectrum absorption cell and the gas spectrum reference cell; An adjustable angle reflector is provided at each end of the gas spectrum reference cell; When it is necessary to obtain the gas spectrum absorption signal, the spectrum analysis light emitted by the light source component enters the gas spectrum absorption cell through the transparent optical window, forms multiple reflections between the first concave reflector component and the second concave reflector component in sequence, and then irradiates the spectrum sensor component, and the spectrum sensor component reads the gas absorption spectrum signal output; When it is necessary to obtain a gas spectrum reference signal, the angles of the two adjustable angle reflectors are synchronously adjusted so that the light emitted by the light source assembly is reflected by the two adjustable angle reflectors without passing through the transparent optical window or entering the gas spectrum absorption cell. Instead, it is directly irradiated to the spectrum sensor assembly inside the gas spectrum reference cell, and the gas reference spectrum signal output is read by the spectrum sensor assembly.

[0005] Furthermore, the light source assembly is composed of a spectral light source and a light source condenser; the spectral light source is used to emit spectral light, and the light source condenser is used to focus the spectral light and then propagate it along the propagation direction of the optical path.

[0006] Furthermore, there are three first concave reflector assemblies. Along the propagation direction of the light path, the spectral light is focused by the light source condenser and then incident on the first concave reflector through the transparent optical window. The first first concave reflector reflects the light and focuses it on the second concave reflector. The second concave reflector assembly reflects the light and focuses it on the second first concave reflector. The second first concave reflector reflects the light again and focuses it on the second concave reflector. The second concave reflector assembly reflects the light again and focuses it on the second first concave reflector. The second first concave reflector reflects the light again and focuses it on the second concave reflector. The second concave reflector assembly focuses the light on the third first concave reflector. The third first concave reflector irradiates the light through the transparent optical window onto the spectral sensor assembly, and the spectral sensor assembly reads the gas absorption spectral signal output.

[0007] Furthermore, the focal lengths of the first first concave reflecting mirror, the second first concave reflecting mirror, and the third first concave reflecting mirror and the second concave reflecting mirror assembly are all the same.

[0008] Furthermore, the spectral sensor assembly is composed of a spectral sensor condenser and a spectral detector. The spectral sensor condenser receives the light emitted by the third first concave reflector and focuses it onto the spectral detector.

[0009] Furthermore, the spectral sensor component reads the gas spectral signal by integration. The specific integration method is to accumulate the gas absorption spectral signal read by the spectral sensor component N times at T time intervals, where N is the inverse of the switching frequency of the adjustable angle reflector.

[0010] Furthermore, the spectral sensor component adopts a reference method to read the gas spectrum signal. The specific reference method is to subtract or divide the signal P1 passing through the gas spectrum reference cell by the signal P2 passing through the gas spectrum absorption cell, and read it as a primary gas absorption spectrum signal P.

[0011] After adopting the above technical solution, the present invention has the following advantages: 1) The present invention realizes the isolation and real-time switching of the gas spectrum absorption light path and the gas spectrum reference light path through a transparent optical window and an adjustable angle reflector arranged in the gas spectrum reference cell. By switching the gas spectrum absorption light path and the gas spectrum reference light path at preset time intervals, the actual absorption spectrum signal of the gas is calculated and integrated multiple times, thereby forming a relationship in which the intensity of the gas spectrum absorption signal is proportional to the number of light path switching times, thereby achieving the effect of improving the intensity of the gas spectrum absorption signal by accumulating the number of light path switching times.

[0012] 2) The present invention reduces the requirements on the collimation of the light source and reduces the complexity and cost of the spectral light source by adopting the cooperation of the light source condenser, the spectral sensor condenser and a plurality of first concave reflectors and second concave reflectors.

[0013] 3) The present invention achieves the unification of the optical parameters of the concave reflecting mirrors by using a plurality of first concave reflecting mirrors and second concave reflecting mirror assemblies with the same focal length, thereby reducing the processing and manufacturing costs of the optical parts of the system.

[0014] 4) The present invention realizes real-time reference calibration of the light source intensity and the sensitivity of the spectral sensor detector of the system by setting a gas spectral reference cell isolated from the gas spectral absorption cell, thereby improving the accuracy and stability of the spectral odor recognition module.

[0015] 5) The present invention effectively improves the intensity and stability of the gas spectrum signal by designing an integration method of the gas spectrum signal. The present invention effectively improves the sensitivity and accuracy of the gas spectrum signal by designing a reference method of the gas spectrum signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the spectral odor recognition module of the embodiment; Figure 2 Schematic diagram of the reference optical path of the gas spectrum in the spectrum odor recognition module of the embodiment; Figure 3 Schematic diagram of the gas spectral absorption light path in the spectral odor recognition module of the embodiment; Reference numerals: 800 is a second concave reflector assembly, 801 is a first concave reflector, 802 is a second first concave reflector, 803 is a third concave reflector, 804 is a first adjustable angle reflector, 805 is a second adjustable angle reflector, 806 is a light source condenser, 807 is a spectrum sensor condenser, 808 is a spectrum light source, 809 is a spectrum detector, 810 is a gas spectrum absorption cell, 811 is a gas spectrum reference cell, and 812 is a transparent optical window. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a spectrum odor recognition module in an embodiment. Figure 1 As shown, a spectral odor recognition module provided in this embodiment includes: a light source assembly, a transparent optical window 812, a first concave reflector assembly, a second concave reflector assembly 800, two adjustable angle reflectors, and a spectral sensor group; the first concave reflector assembly is respectively a first first concave reflector 801, a second first concave reflector 802 and a third first concave reflector 803, and the three first concave reflectors are arranged in the same row. The two adjustable angle reflectors are respectively: a first adjustable angle reflector 804 and a second adjustable angle reflector 805. The light source assembly is used to emit spectral analysis light, and is composed of a spectral light source 808 and a light source condenser 806; the spectral sensor assembly is composed of a spectral sensor condenser 807 and a spectral detector 809. The transparent optical window 812 is located between the three first concave reflectors and the second concave reflector assembly 800, and a gas spectral absorption cell 810 is formed between the three first concave reflectors and the transparent optical window 812, and the gas to be measured flows inside the gas spectral absorption cell 810. A gas spectral reference cell 811 is formed between the second concave reflector assembly 800 and the transparent optical window 812 , and a reference gas or a vacuum flows inside the gas spectral reference cell 811 .

[0019] The gas spectrum absorption cell 810, the spectrum light source 808, the light source condenser 806, the first adjustable angle reflector 804, the transparent optical window 812, the first first concave reflector 801, the second first concave reflector 802, the third first concave reflector 803, the second concave reflector assembly 800, the second adjustable angle reflector 805, the spectrum sensor condenser 807, and the spectrum detector 809 together constitute the gas spectrum absorption optical path. The gas spectrum reference cell 811, the spectrum light source 808, the light source condenser 806, the first adjustable angle reflector 804, the second adjustable angle reflector 805, the spectrum sensor condenser 807, and the spectrum detector 809 together constitute the gas spectrum reference optical path.

[0020] The gas spectrum absorption light path is as follows Figure 2 As shown, the spectrum analysis light emitted by the spectrum light source 808 is focused by the light source condenser 806, and reflected by the first adjustable angle reflector 804 to the third concave reflector 803. The third concave reflector focuses the light through the spectrum sensor condenser 807 to the spectrum detector 809 to obtain the gas reference absorption spectrum signal output. The schematic diagram of the gas spectrum reference light path is shown in Figure 3As shown, the spectral analysis light emitted by the spectral light source 808 is focused by the light source condenser 806, reflected by the first adjustable angle reflector 804 to the second adjustable angle reflector 805, and then passed through the spectral sensor condenser 807 to be focused on the spectral detector 809 to obtain a gas reference spectral signal output.

[0021] The gas spectrum absorption signal intensity of this embodiment is achieved in two aspects. The first is: by setting a folded reflection light path formed by a multi-faceted first concave reflector, the optical path is increased, thereby increasing the gas spectrum absorption intensity. The second is: using a transparent optical window 812 and a first adjustable angle reflector 804 and a second adjustable angle reflector 805 to achieve sealing and isolation between the gas spectrum absorption light path and the gas spectrum reference light path. By synchronously adjusting the angles of the first adjustable angle reflector 804 and the second adjustable angle reflector 805, the continuous switching of the gas spectrum absorption light path and the gas spectrum reference light path is achieved, and the gas spectrum absorption signal intensity is accumulated by the number of switching times, thereby achieving an increase in the gas spectrum absorption signal intensity.

[0022] The process of increasing the intensity of gas spectrum absorption signal by setting a multi-faceted first concave reflector is as follows: Figure 2 As shown, the spectral analysis light emitted by the spectral light source 808 is focused by the light source condenser 806, and irradiated on the first first concave reflector 801 through the transparent optical window 812. The first first concave reflector 801 reflects and focuses the light on the second concave reflector assembly 800. The second concave reflector assembly 800 reflects and focuses the light on the second first concave reflector 802. The second first concave reflector reflects and focuses the light on the second concave reflector assembly 800 again. The second concave reflector assembly 800 reflects and focuses the light on the second first concave reflector 802 again. The second first concave 802 reflector reflects and focuses the light on the second concave reflector assembly 800 again. The second concave reflector assembly 800 focuses the light on the third first concave reflector 803. The third first concave reflector 803 focuses the light on the spectral detector 809 through the transparent optical window 812 and the spectral sensor condenser 807 to obtain the gas absorption spectrum signal output.

[0023] In this embodiment, the first adjustable angle reflector 804 and the second adjustable angle reflector 805 can adjust the angles synchronously multiple times according to needs. After each N-times angle adjustment, the gas absorption spectrum signal and the gas reference absorption spectrum signal are superimposed and calculated to obtain N times the gas spectrum absorption intensity signal, thereby achieving the purpose of improving the intensity of the gas spectrum absorption signal.

[0024] In summary, this embodiment realizes the real-time switching of the spectral odor recognition module between the gas spectral absorption cell 810 and the gas spectral reference cell 811 which are sealed and isolated by the transparent optical window 812 by adopting the method of synchronously adjusting the angle of the first adjustable angle reflector 804 and the second adjustable reflector 805, and the gas spectral absorption intensity is superimposed and accumulated by multiple switching to perform spectral signal analysis. The accumulated result greatly improves the intensity of the gas spectral absorption signal, and also realizes the self-calibration function of the spectral odor recognition module, thereby improving the accuracy and stability of the spectral signal. In terms of structure, the commonly used structures such as the light source condenser 806, the three first concave reflectors and the second concave reflector assembly 800, and the spectral sensor condenser 807 are adopted, which greatly simplifies the structure of the spectral odor recognition module and greatly reduces the cost of the spectral odor recognition module. In addition, the first concave reflector and the second concave reflector assembly 800 are both of the same focal length, which not only unifies the optical parameters of the concave reflectors, but also reduces the processing and manufacturing cost of the optical parts of the system.

[0025] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A spectrum odor recognition module, characterized in that: include: A light source assembly, a transparent optical window, a first concave reflector assembly, a second concave reflector assembly, and a spectrum sensor assembly; The light source assembly is used to emit light for spectral analysis; A gas spectrum absorption cell and a gas spectrum reference cell isolated from each other are formed between the first concave reflector assembly and the second concave reflector assembly, a transparent optical window for isolating the gas spectrum absorption cell and the gas spectrum reference cell is provided between the gas spectrum absorption cell and the gas spectrum reference cell, and the transparent optical window does not absorb light for spectrum analysis; An adjustable angle reflector is provided at each end of the gas spectrum reference cell; When it is necessary to obtain the gas spectrum absorption signal, the light emitted by the light source assembly enters the gas spectrum absorption cell through the transparent optical window, and then forms multiple reflections between the first concave reflector assembly and the second concave reflector assembly, and then irradiates the spectrum sensor assembly, and the spectrum sensor assembly reads the gas absorption spectrum signal output; When it is necessary to obtain a gas spectrum reference signal, the angles of the two adjustable angle reflectors are synchronously adjusted so that the light emitted by the light source assembly is reflected by the two adjustable angle reflectors without passing through the transparent optical window or entering the gas spectrum absorption cell. Instead, it is directly irradiated to the spectrum sensor assembly inside the gas spectrum reference cell, and the gas reference spectrum signal output is read by the spectrum sensor assembly.

2. A spectrum odor recognition module according to claim 1, characterized in that: The light source assembly is composed of a spectral light source and a light source condenser; the spectral light source is used to emit light for spectral analysis, and the light source condenser is used to focus the spectral analysis light and then propagate it along the propagation direction of the light path.

3. The spectral odor recognition module according to claim 1, characterized in that: There are three first concave reflector assemblies. Along the propagation direction of the light path, after being focused by the light source condenser, the light is incident on the first concave reflector through the transparent optical window. The first first concave reflector reflects the light and focuses it on the second concave reflector assembly. The second concave reflector assembly reflects the light and focuses it on the second first concave reflector. The second first concave reflector reflects the light again and focuses it on the second concave reflector assembly. The second concave reflector reflects the light again and focuses it on the second first concave reflector. The second first concave reflector reflects the light again and focuses it on the second concave reflector. The second concave reflector focuses the light on the third first concave reflector. The third first concave reflector irradiates the light through the transparent optical window onto the spectral sensor assembly. The spectral sensor assembly reads the gas absorption spectrum signal output.

4. The spectral odor recognition module according to claim 3, characterized in that: The spectrum sensor assembly consists of a spectrum sensor condenser and a spectrum detector. The spectrum sensor condenser receives the light emitted by the third first concave reflector and focuses it onto the spectrum detector.

5. The spectral odor recognition module according to claim 3, characterized in that: The focal lengths of the first first concave reflecting mirror, the second first concave reflecting mirror, and the third first concave reflecting mirror and the second concave reflecting mirror assembly are all the same.

6. The spectral odor recognition module according to claim 1, characterized in that: The spectral sensor component adopts an integration method to read the gas absorption spectral signal; the specific integration method is to accumulate the gas absorption spectral signals read by the spectral sensor component (NM) times at a time interval of T; wherein: N is the reciprocal of the switching frequency of the adjustable angle reflector, and after reading the signal N times, the spectral signal is sorted from weak to strong, M is the number of the weakest spectral signal in the N spectral signal sorting, and the value range of M is between 0 and 6.

7. The spectral odor recognition module according to claim 1, characterized in that: The spectral sensor assembly adopts a reference method to read the gas absorption spectrum signal. The specific reference method is to divide the cube of the signal P2 passing through the gas spectrum absorption cell by the cube of the signal P1 passing through the gas spectrum reference cell, and then take the logarithm. The result is read as a primary gas absorption spectrum signal P.

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