Multi-source water pollutant detection device based on multi-dimensional spectral information fusion

Abstract

A multi-source water pollutant detection device based on multi-dimensional spectral information fusion comprises a base, a light shield, an electric signal detector, an absorption and fluorescence generation mechanism and a light filtering and light transmitting mechanism, the absorption and fluorescence generation mechanism and the light filtering and light transmitting mechanism are oppositely arranged on the base, and the light shield covers the base; the light filtering and transmitting mechanism comprises a plurality of light filters, through holes, light filter mounting fixing parts and photoelectric sensors; the photoelectric sensors are used for converting fluorescence signals filtered by the corresponding light filters and transmission light signals passing through the through holes into electric signals; the photoelectric sensors are connected with the electric signal detector; the absorption and fluorescence generation mechanism comprises a sample bin and a light source irradiation part for irradiating light sources with different wave bands in the sample bin, and a focusing part is arranged on the sample bin and used for focusing transmission light and fluorescence generated after irradiation and absorption of the light sources with the corresponding wave bands and irradiating the transmission light and the fluorescence to the through hole in the light filter mounting and fixing part and the light filter. According to the utility model, the advantages of absorption spectrometry and three-dimensional fluorescence spectrometry are fused, and rapid detection of pollutants is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of water quality detection, and specifically relates to a multi-source water pollutant detection device based on multi-dimensional spectral information fusion. Background Art

[0002] In recent years, water pollution has become one of the main environmental issues affecting global sustainable development. Water pollution not only harms human health, but also destroys the balance of the ecosystem and hinders sustainable development. In order to protect public health, it is necessary to use scientific means to manage water bodies. Real-time and effective monitoring of pollutants in water bodies is an important means of water management.

[0003] At present, the instruments that use absorption spectroscopy for water quality testing cannot provide sufficient pollutant specificity or sensitivity. The instruments that use three-dimensional fluorescence spectroscopy for water quality testing have limitations such as long scanning process, large amount of measurement result data, and high equipment performance requirements, which are difficult to meet the needs of portability and speed. Summary of the invention

[0004] In order to overcome the shortcomings of existing water pollutant detection instruments designed based on absorption spectroscopy and three-dimensional fluorescence spectroscopy, the utility model provides a multi-source water pollutant detection device based on multi-dimensional spectral information fusion, which integrates the advantages of absorption spectroscopy and three-dimensional fluorescence spectroscopy.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A multi-source water pollutant detection device based on multi-dimensional spectral information fusion, comprising a base, a light shield, an electrical signal detector, and an absorption and fluorescence generating mechanism, a filtering and light transmitting mechanism arranged relatively on the base, wherein the light shield covers the base; the filtering and light transmitting mechanism comprises a plurality of filters and through holes, a filter mounting fixture, and a photoelectric sensor for converting fluorescence signals filtered by corresponding filters and transmitted light signals through the through holes into electrical signals, wherein the photoelectric sensor is connected to the electrical signal detector; the absorption and fluorescence generating mechanism comprises a sample chamber and a light source irradiating member for irradiating the sample chamber with light sources of different wavelength bands, wherein a focusing member is provided on the sample chamber for focusing the transmitted light and fluorescence generated after being irradiated and absorbed by the light sources of corresponding wavelength bands, and irradiating them to the through holes and filters on the filter mounting fixture.

[0007] Furthermore, the filter mounting fixture includes a disc and a disc bracket, the disc bracket is fixedly mounted on the base, the disc is parallel to the base and rotatably mounted on the disc bracket, and a plurality of mounting grooves for detachably mounting the filter and a through hole are provided at equal arc intervals on a circle of the disc.

[0008] Furthermore, a pressing ring is provided on the inner wall of the mounting groove, and the number of the filters is consistent with the number of the pressing rings, which is 5, and the wavelength bands allowed to pass are 250-290nm, 345-385nm, 430-460nm, 555-585nm and 655-685nm respectively.

[0009] Preferably, the inner wall of the through hole is smooth, allowing full-band light to pass through, and the line connecting the center of the circular through hole and the five circular mounting grooves and the center of the disk divides the disk into six equal parts.

[0010] The disc support also includes a stepping motor for driving the disc to rotate, and the rotating shaft of the disc is linked to the output shaft of the stepping motor.

[0011] The photoelectric sensor is installed on the groove and the small hole arranged on the corresponding disc bracket.

[0012] The sample chamber comprises a sample slot and a sample chamber cover for sealing the sample chamber, an opening is provided above the sample slot, the sample chamber cover covers the opening of the sample slot, and a cuvette for carrying a sample to be tested is placed in the sample slot.

[0013] The light source irradiation member includes a first fluorescent LED lamp installation column. Since the fluorescent signal needs to be detected in a direction perpendicular to the excitation light, the first fluorescent LED lamp installation column is arranged on the side wall surface adjacent to the sample compartment and the turntable directly opposite. Two visible light LED lamp path channels are arranged inside the first fluorescent LED lamp installation column, and each visible light LED lamp path channel is connected to the sample compartment. An LED light source is placed in each visible light LED lamp path channel, including a purple light-emitting LED and a green light-emitting LED, which can emit excitation light sources with wavelengths of 410-430nm and 540-560nm respectively.

[0014] As a preferred embodiment, the light source irradiation member also includes a second fluorescent LED lamp mounting column. Since the fluorescent signal needs to be detected in a direction perpendicular to the excitation light, the second fluorescent LED lamp mounting column is arranged on the other side wall of the sample bin directly opposite to the first fluorescent LED lamp mounting column. The second fluorescent LED lamp mounting column is provided with an ultraviolet LED lamp path channel inside, which is connected to the sample bin. An ultraviolet LED light source is placed in the ultraviolet LED lamp path channel, and the emission wavelength is 270-280nm. In order to maintain the stability of the excitation light intensity, the LED lamp needs to be fixed on the mounting column, and the fixing structure is designed according to the appearance of different LED light sources. The visible light LED is fixed by a fixed bracket. The ultraviolet LED itself has a large power when irradiated, and a heat dissipation substrate needs to be added, and it is fixed by a mechanical gripper.

[0015] The light source irradiation component includes a third absorbing LED lamp mounting column. Since the transmitted light signal needs to be detected in the direction of the incident light, the third absorbing LED lamp mounting column is arranged on the side wall surface directly opposite the turntable on the sample bin. A visible light LED light path channel and an ultraviolet LED light path channel are provided inside the third absorbing LED lamp mounting column, and each light path channel is connected to the sample bin. A visible light LED light source with an emission center wavelength of 546nm is placed in the visible light LED light path channel. An ultraviolet LED light source with an emission center wavelength of 254nm is placed in the ultraviolet LED light path channel. The visible light LED is fixed by a small hole on the mounting column. The ultraviolet LED needs to be added with a heat dissipation substrate and is fixed by a mechanical gripper.

[0016] The focusing component includes a focusing lens, which is arranged on the wall of the sample chamber on one side of the turntable and fixed by a mounting groove and a pressure ring. The fluorescence generated in the sample chamber and the transmitted light absorbed by the sample are converged to the filter and the through hole through the focusing lens.

[0017] During the test, put the sample to be tested into the cuvette in the sample chamber, first cover the sample chamber cover, and then cover the light shield to ensure that it is not affected by external light during the test.

[0018] The beneficial effects of the utility model are mainly manifested in: integrating the fluorescence optical path structure and the absorption optical path structure, integrating the advantages of absorption spectroscopy and three-dimensional fluorescence spectroscopy; by switching multiple LED light sources and filters, completing the rapid scanning of samples in the sample chamber, and realizing the measurement of fluorescence intensity and absorbance of multiple excitation bands-emission bands; it can simultaneously detect pollutants such as phenol, tryptophan, fluorescent whitening agents, fluorescein, chlorophyll, rhodamine and COD, and realize rapid detection of the types and concentrations of various pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a multi-source water pollutant detection device based on multi-dimensional spectral information fusion;

[0020] Figure 2 It is a front view of a multi-source water pollutant detection device based on multi-dimensional spectral information fusion;

[0021] Figure 3 A top view of a multi-source water pollutant detection device based on multi-dimensional spectral information fusion;

[0022] In the figure: 1. base, 2. light shield, 31. sample slot, 32. sample compartment cover, 3. first fluorescent LED lamp mounting column, 4. second fluorescent LED lamp mounting column, 5. third absorption LED lamp mounting column, 51. focusing lens, 6. filter and through hole, 7. filter mounting fixture, 8. cuvette, 71. disc, 72. disc bracket, 73. stepping motor. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings.

[0024] Reference Figure 1 to Figure 3 , a multi-source water pollutant detection device based on multi-dimensional spectral information fusion, comprising a base 1, a light shield 2, an electric signal detector, and an absorption and fluorescence generating mechanism, a light filtering and light transmitting mechanism arranged relatively on the base 1, wherein the light shield 2 covers the base 1;

[0025] The filtering and light transmission mechanism includes a plurality of filters and through holes 6 and a filter mounting fixture 7, and also includes a photoelectric sensor for converting the optical signal filtered by the corresponding filters and through the through holes into an electrical signal, and the photoelectric sensor is connected to the electrical signal detector. The wavelength ranges allowed to pass by the plurality of filters and through holes 6 are 250-290nm, 345-385nm, 430-460nm, 555-585nm, and 655-685nm, respectively, and the through holes allow the passage of light of the full wavelength band.

[0026] The filter mounting fixture 7 includes a disc 71 and a disc bracket 72, wherein the disc bracket 72 is fixedly mounted on the base 1, the disc 71 is perpendicular to the base 1, and the disc is rotatably mounted on the disc bracket 72. The disc 71 is provided with a plurality of mounting grooves for detachably mounting the filter, and a pressure ring is provided on the inner wall of the mounting groove; the stepping motor 73 is fixedly mounted on the disc bracket 72, and the rotating shaft of the disc 71 is linked with the output shaft of the stepping motor 73.

[0027] The absorption and fluorescence generating mechanism includes a sample chamber, a light source irradiating part for irradiating the sample chamber with light sources of different wavelengths, and a focusing part is provided on the sample chamber for focusing the transmitted light absorbed by the pollutant and the fluorescence generated by the pollutant after being irradiated by the light source of the corresponding wavelength and irradiating the light to the filter on the filter mounting fixture. The sample chamber includes a sample slot 31 and a sample chamber cover 32 for covering the sample slot, an opening is provided above the sample slot 31, the sample chamber cover 32 covers the opening of the sample slot 31, and a cuvette 8 for carrying the sample to be tested is placed at the bottom of the sample slot 31. The chamber wall of the sample chamber close to the disc 71 is opened, and a mounting slot is provided to place the focusing lens 51.

[0028] The light source irradiation member includes a first fluorescent LED lamp mounting column 3, a second fluorescent LED lamp mounting column 4, and a third absorption LED lamp mounting column 5. The first fluorescent LED lamp mounting column 3 is arranged on the side wall surface adjacent to the sample slot 31 and the turntable, and two visible light LED lamp path channels are arranged inside the first fluorescent LED lamp mounting column 3, and the two visible light LED lamp path channels are both connected to the sample slot. The second fluorescent LED lamp mounting column 4 is arranged on the other side wall surface adjacent to the sample slot 31 and the turntable, and an ultraviolet LED lamp path channel is arranged inside the second fluorescent LED lamp mounting column 4, and the ultraviolet LED lamp path channel is connected to the sample slot 31. The third absorption LED lamp mounting column 5 is arranged on the wall surface opposite to the sample slot 31 and the turntable, and an ultraviolet LED lamp path channel and a visible light LED lamp path channel are arranged inside the third absorption LED lamp mounting column 5, and the two light path channels are both connected to the sample slot.

[0029] The number of optical path channels is consistent with the number of light sources. The connecting wires of the light sources are fixed to the base through a light source fixing bracket or a mechanical gripper. The first fluorescent LED lamp mounting column 3 has two optical path channels for placing the purple light-emitting LED and the green light-emitting LED, which are fixed by a light source fixing bracket. The second fluorescent LED lamp mounting column 4 has one optical path channel for placing the ultraviolet light-emitting LED, which is fixed by a mechanical gripper. The third absorption LED lamp mounting column 5 has two optical path channels for placing the ultraviolet light-emitting LED and the green light-emitting LED, respectively, which are fixed by mechanical grippers and small holes on the mounting column. In order to maintain the stability of the excitation light intensity, the LED lamp needs to be fixed on the mounting column. The fixing structure is designed according to the appearance of different LED light sources. The visible light LED is fixed by a fixing bracket. The ultraviolet LED has a large power when irradiated, and a heat dissipation substrate is required, which is fixed by a mechanical gripper.

[0030] The light sources are respectively an ultraviolet LED capable of emitting light with a wavelength of 270-280nm, an ultraviolet LED capable of emitting light with a central wavelength of 254nm, a purple LED capable of emitting light with a wavelength of 410-430nm, a green LED capable of emitting light with a wavelength of 540-560nm, and a green LED capable of emitting light with a central wavelength of 546nm.

[0031] The electrical signal detector comprises a fluorescence absorption signal selection circuit, a signal amplification circuit and a microprocessor for analyzing and processing the signal, and the signal amplification circuit is connected to the photoelectric sensor.

[0032] Preferably, the first fluorescent LED lamp mounting column 3, the second fluorescent LED lamp mounting column 4 and the third absorption LED lamp mounting column 5 are all cylindrical. The photoelectric sensor is a S1227-BQ photodiode with a sensitivity of 0.36A / W, a maximum dark current of 5pA, and a wavelength response range of 190-1000nm.

[0033] The working process of the multi-source water pollutant detection device based on multi-dimensional spectral information fusion of this embodiment is as follows:

[0034] Place the cuvette containing the sample to be tested into the bottom of the sample tank 31, cover the sample compartment cover 32 and the light shield 2 in turn, control the switching of LED light sources of different wavelengths, the fluorescent part LED light source includes ultraviolet light-emitting LED, purple light-emitting LED and green light-emitting LED, which can respectively emit excitation light sources with wavelengths of 270-280nm, 410-430nm and 540-560nm, corresponding to different excitation modes, the absorption part LED light source includes a central wavelength of 254nm ultraviolet light-emitting LED and a central wavelength of 546nm green light-emitting LED, and the LED light source emits light beams to the sample compartment in turn. The light shield 2 and the sample compartment cover 32 are used to shield external light during measurement to avoid being affected.

[0035] Under the illumination of the light source, the fluorescence generated by the sample to be tested in the sample chamber and the transmitted light absorbed by the sample to be tested are focused by the focusing lens 51, and then the bandpass filters and through holes of different wavelengths are switched in sequence through the filter mounting fixture 7, thereby realizing a rapid scan of the sample to be tested and combining LEDs and filters of different wavelength bands to obtain a measurement area block of a specific substance.

[0036] A photoelectric sensor is arranged behind the filtering mechanism. The photoelectric sensor receives the light signal filtered by the filter and the through hole 6 and converts it into an electrical signal. The absorption and fluorescence signals are respectively selected by the absorption and fluorescence signal selection circuit in the electrical signal detector. The signal amplification circuit amplifies the tiny electrical signal. The microprocessor in the electrical signal detector uses multi-dimensional spectral information fusion modeling to analyze the types and concentrations of pollutants in the water body, and finally realizes the measurement of the types and concentrations of pollutants such as phenol, tryptophan, fluorescent whitening agent, fluorescein, chlorophyll, rhodamine, COD, etc. in the water body.

[0037] The combination of excitation band 270-280nm and emission band 250-290nm represents pollutants: phenol, the combination of excitation band 270-280nm and emission band 345-385nm represents pollutants: tryptophan, the combination of excitation band 270-280nm and emission band 430-460nm represents pollutants: fluorescent whitening agent, the combination of excitation band 410-430nm and emission band 555-585nm represents pollutants: fluorescein, the combination of excitation band 410-430nm and emission band 655-685nm represents pollutants: chlorophyll pollutants, the combination of excitation band 540-560nm and emission band 655-685nm represents pollutants: rhodamine. The excitation-emission fluorescence information and the 254nm and 546nm absorbance information are fused into a multi-dimensional spectral information model to accurately detect COD concentration and perform turbidity compensation.

[0038] By using a multi-source water pollutant detection device with multi-dimensional spectral information fusion provided in this embodiment, the requirements of a detection instrument being able to detect a variety of pollutants and a fast detection speed can be met, and it has a good prospect for application and promotion.

[0039] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope of the present invention.

Claims

1. A multi-source water pollutant detection device based on multi-dimensional spectral information fusion, characterized in that: The device comprises a base, a light shield, an electric signal detector, and an absorption and fluorescence generating mechanism and a filtering and light transmitting mechanism arranged relatively on the base, wherein the light shield covers the base; the filtering and light transmitting mechanism comprises a plurality of filters and through holes, a filter mounting fixture, and a photoelectric sensor for converting the fluorescence signal filtered by the filters and the transmission light signal through the through holes into electric signals, wherein the filters and the through holes are located on the filter mounting fixture, and the photoelectric sensor is connected to the electric signal detector; the absorption and fluorescence generating mechanism comprises a sample chamber and a light source irradiating member for irradiating the sample chamber with light sources of different wavelength bands, wherein a focusing member is provided on the sample chamber for focusing the transmission light and fluorescence generated after being irradiated and absorbed by the light sources of corresponding wavelength bands, and irradiating the transmission light and fluorescence to the through holes and filters located on the filter mounting fixture.

2. The multi-source water pollutant detection device based on multi-dimensional spectral information fusion as claimed in claim 1, characterized in that: The filter mounting fixture comprises a disc and a disc bracket, wherein the disc bracket is fixedly mounted on the base, the disc is parallel to the base and rotatably mounted on the disc bracket, and the plurality of mounting grooves for detachably mounting the filter and a through hole are arranged at equal arc intervals on a circle of the disc.

3. The multi-source water pollutant detection device based on multi-dimensional spectral information fusion as claimed in claim 2, characterized in that: A pressing ring is provided on the inner wall of the mounting groove. The number of the filters is consistent with the number of the pressing rings, which is 5. The wavelength bands allowed to pass are 250-290nm, 345-385nm, 430-460nm, 555-585nm and 655-685nm respectively.

4. The multi-source water pollutant detection device based on multi-dimensional spectral information fusion as claimed in claim 3, characterized in that: The inner wall of the through hole is smooth, allowing full-band light to pass through. The line connecting the center of the circular through hole and the positions where the five circular mounting grooves are set and the center of the circular disk divides the circular disk into six equal parts.

5. The multi-source water pollutant detection device based on multi-dimensional spectral information fusion according to any one of claims 2 to 4, characterized in that: The disc support also includes a stepping motor for driving the disc to rotate, and the rotating shaft of the disc is linked to the output shaft of the stepping motor.

6. The multi-source water pollutant detection device based on multi-dimensional spectral information fusion according to any one of claims 1 to 4, characterized in that: The sample chamber comprises a sample slot and a sample chamber cover for sealing the sample chamber, an opening is provided above the sample slot, the sample chamber cover covers the opening of the sample slot, and a cuvette for carrying a sample to be tested is placed in the sample slot.

7. The multi-source water pollutant detection device based on multi-dimensional spectral information fusion according to any one of claims 1 to 4, characterized in that: The light source irradiation component includes a first fluorescent LED lamp mounting column. Since the fluorescent signal needs to be detected in a direction perpendicular to the excitation light, the first fluorescent LED lamp mounting column is arranged on the side wall surface adjacent to the sample bin and directly opposite the turntable. Two visible light LED lamp path channels are arranged inside the first fluorescent LED lamp mounting column, and each visible light LED lamp path channel is connected to the sample bin; an LED light source is placed in each visible light LED lamp path channel, including a purple light-emitting LED and a green light-emitting LED, which can emit excitation light sources with wavelengths of 410-430nm and 540-560nm respectively.

8. The multi-source water pollutant detection device based on multi-dimensional spectral information fusion as claimed in claim 7, characterized in that: The light source irradiation component also includes a second fluorescent LED lamp mounting column. Since the fluorescent signal needs to be detected in a direction perpendicular to the excitation light, the second fluorescent LED lamp mounting column is arranged on the other side wall of the sample chamber directly opposite to the first fluorescent LED lamp mounting column. An ultraviolet LED lamp path channel is provided inside the second fluorescent LED lamp mounting column. The ultraviolet LED lamp path channel is connected to the sample chamber. An ultraviolet LED light source is placed in the ultraviolet LED lamp path channel, and the emission wavelength is 270-280nm; the visible light LED is fixed to the mounting column by a fixed bracket, a heat dissipation substrate is provided on the ultraviolet LED, and the ultraviolet LED is fixed to the mounting column by a mechanical gripper.

9. The multi-source water pollutant detection device based on multi-dimensional spectral information fusion as claimed in claim 8, characterized in that: The light source irradiation component also includes a third absorbing LED lamp mounting column. Since the transmitted light signal needs to be detected in the direction of the incident light, the third absorbing LED lamp mounting column is arranged on the side wall surface directly opposite the turntable on the sample bin. A visible light LED light path channel and an ultraviolet LED light path channel are provided inside the third absorbing LED lamp mounting column, and each light path channel is connected to the sample bin. A visible light LED light source is placed in the visible light LED light path channel, and the emission center wavelength is 546nm. An ultraviolet LED light source is placed in the ultraviolet LED light path channel, and the emission center wavelength is 254nm. The visible light LED is fixed by a small hole on the mounting column, and the ultraviolet LED needs to be added with a heat dissipation substrate, which is fixed by a mechanical gripper.

10. The multi-source water pollutant detection device based on multi-dimensional spectral information fusion according to any one of claims 1 to 4, characterized in that: The focusing component includes a focusing lens, which is arranged on the wall of the sample chamber on one side of the turntable and fixed by a mounting groove and a pressure ring. The fluorescence generated in the sample chamber and the transmitted light absorbed by the sample are converged to the filter and the through hole through the focusing lens.

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