CN216386741U - Multi-wavelength optical measurement module with LED array as core - Google Patents
Multi-wavelength optical measurement module with LED array as core Download PDFInfo
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Abstract
A multi-wavelength optical measurement module with an LED array as a core is mainly used in the field of water quality analysis, and can be coupled with devices or modules such as an online sampling module, an analysis metering module and the like in a water quality analysis system to provide multi-wavelength absorbance data. The equipment unit comprises a designed optical module and a power supply control module, can ensure that a plurality of LED light sources, silicon receivers and amplifying circuits carry out synchronous but independent measurement and data acquisition under the condition that light paths are not interfered with each other, absorbs ultraviolet and visible light of a plurality of wave bands, and shortens the measurement period to the second level. Meanwhile, the unit is small in volume and has the condition of on-site deployment as a component of an on-line optical water quality analysis module.
Description
Technical Field
The utility model relates to a multi-wavelength spectrum measuring module with an LED light source array as a core, which is mainly used for the field of water quality analysis and used for analyzing water supply, drainage and environmental water samples.
Background
The efficient online monitoring capability of the water quality index is the front-end guarantee for ensuring the accurate running state analysis in the field of environmental water supply and drainage technologies. The real-time, stable, standardized and high-flux water quality parameter collection plays an important role in model analysis and process management strategy formulation.
In recent years, thanks to the development of big data analysis capability, a fingerprint spectrum technology for performing characteristic absorption and identification on pollutants by utilizing an ultraviolet-visible light full spectrum is greatly developed. The technology mainly relies on optical means to analyze a water sample, and key pollutant indexes (such as chemical oxygen demand, nitrate nitrogen, total nitrogen, characteristic organic pollutants and the like) are quantified by comprehensively analyzing the absorbance of one or more specific wavelengths. Such as Broeke et al[1]Based on the traditional UV detection technology of CAN company, the technology of calibrating the concentration of target components by using multiple characteristic wavelengths is developed by utilizing data learning, and the test accuracy (adding a standard fitting curve R) of chemical oxygen demand, nitrate nitrogen and nitrite nitrogen is realized2Measured) from 0.08 to 0.2 to>0.9, simultaneously, the analysis of benzene series, pesticide residue and other substances in the water proves that the calibration of the composite water quality index (such as chemical oxygen demand) by the multi-wavelength fingerprint spectrum has feasibility, and the UV-VIS technology is popularized and applied in water quality monitoring.
[1]J.D.Van Broeke et.Al,Spectroscopy Europe[J],2006,18(4):1-4。
In the related art application, a spectral measurement means widely adopted is to capture the transmittance of light with specific wavelength after a deuterium lamp + tungsten lamp source or a scintillation xenon lamp source performs full-spectrum scanning, or to read the transmittance of light with target wavelength after specific wavelength light splitting is performed by a stepping motor control grating. When a deuterium lamp and a tungsten lamp are used, the core problem limiting the service life of the device is the service life and preheating stability of the deuterium lamp (in order to ensure the stability, the light source needs to be stabilized for about 15min after being lightened, and needs to be normally opened in a continuous online measurement scene), and the service life is usually only about 5000-7000 hours; when using xenon lamp sources, stroboscopic light sources and full spectrum reception usually have high technical requirements for the receiver, and naturally have a certain light source stability error.
At present, the visible light LED light source technology is quite mature, the deep ultraviolet LED light source technology is greatly developed in recent years, compared with the traditional deuterium lamp source or mercury ultraviolet lamp, the LED does not need preheating time and mercury, has the advantages of environmental protection, long service life, energy conservation, less heat loss and the like, and is more beneficial to the miniaturization of the whole equipment. Depending on a small deep ultraviolet LED light source and a visible light LED light source, a multi-wavelength LED measurement array covering an ultraviolet-visible light waveband can be developed, and a traditional optical measurement module of a deuterium lamp and tungsten lamp source coupling grating or a module of a xenon lamp and a high-efficiency optical receiver is replaced to a certain extent. Therefore, the remaining core problem lies in how to enable the module to efficiently integrate multiple measurement wavelength units by optimizing the ultraviolet-visible light LED light source array, and realize the uniform control by the upper software, so as to form a small-sized integrated light source module with low cost and high integration, and realize the quantitative analysis of some key water quality indexes through the multi-wavelength coupling measurement.
Disclosure of Invention
In order to meet the quantitative requirements of multi-index spectral analysis, the utility model aims to: the method comprises the steps that a set of light measurement module using a plurality of LED lamps with specific wavelengths and a receiver array is constructed, and the traditional analysis means that a light source obtains absorbance data through full-spectrum scanning or specific wavelength light splitting by using a grating is replaced, so that direct reading of target multiple wavelengths is realized; and based on the characteristics of no need of preheating of the LED and long service life, a control mode of quick starting, measurement and reading is established, and quick absorbance measurement can be realized when the LED is coupled with an external upper control element (such as a control board card, a single chip microcomputer or a computer).
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a multi-wavelength spectrum measuring module with an LED light source array as a core is characterized by comprising three parts;
the main body bearing piece (A2) is processed by a cuboid acrylic material with the thickness of 40mm (W) multiplied by 90mm (H) multiplied by 30mm (D), a square hole with the thickness of 10mm (W) multiplied by 90mm (H) multiplied by 5mm (D) is opened on the W multiplied by D plane by taking the W direction bisector as a symmetry axis from the top to the bottom, and the edge of the square hole is 10mm away from the inner edge along the depth direction, namely the D direction;
on the internal plane in the square hole, 6 openings are arranged along the depth direction (D direction)
Penetrate through the round hole to be communicated with the square hole, 6
The depth of the penetrating round holes is 10 mm; 6 are
The circle centers of the penetrating round holes are all positioned on the middle line in the W direction, and the adjacent holes are adjacent
The penetrating circular holes are spaced by 15mm from top to bottom;
corresponding to the central axes of the 6 inner circular holes, 6 inner circular holes are arranged on the outer plane except the square hole along the depth direction, namely the D direction
Penetrating the round hole to communicate with the square hole, 6 of the holes
The depth of the penetrating circular hole is 15mm, and the same central shaft is used between the inner penetrating circular hole and the outer penetrating circular hole;
the quartz capsule (A1) is inserted into the square hole of the main body bearing member (A2), and water sample enters from bottom to top and fills the quartz capsule (A1);
the 6 LED light sources (B2) with different wavelengths are sequentially arranged according to the sequence of the lower long wave and the upper short wave, and the light path is kept horizontal; the 6 light sources are respectively arranged on 6
The power supply control module penetrates through the round holes, is respectively connected with 6 power supply circuits and is uniformly led out to the power supply control module;
6 identical receivers and amplifying circuits (C2) are respectively arranged in the 6 receivers
In the through-going circular hole.
Further, flat cylindrical LED light sources with 6 different wavelengths of 254nm, 273nm, 285nm, 317nm, 345nm and 455nm are sequentially assembled from top to bottom.
Further, 6 filters were placed in 6 filters, respectively
In the through-going circular hole.
Full text
The diameter is indicated.
The module is divided into an outer part structure, a middle part structure and an inner part structure. Wherein, the middle part is a water passing quartz cuvette assembly, and a quartz cuvette with an optical path of 5mm or 2mm is inserted into the structural part according to the optical path requirement; the outside is a receiver assembly, which uses 6 independent silicon wide spectrum receivers plus filters to receive the transmitted light; the interior is LED light source subassembly, disposes the LED lamp of 6 selected specific wavelengths, provides the multi-wavelength light source. Meanwhile, a power supply control module of the LED lamp and a receiver data acquisition card are arranged inside and outside the module and used for signal transmission and measurement control.
The module and external connection includes: firstly, an LED lamp and a receiver amplifying circuit are connected with a 12V power supply control module through a power line; secondly, the signal output of the receiver amplifying circuit is connected with a digital acquisition card connected with the control main board through an SMA cable; thirdly, the front end of the quartz capsule is connected with a sampling head through a sampling tube and is arranged in a sampling water pool; the rear end is connected with the collecting module buffer cavity through the sampling tube.
The system adopts a 12V direct current module for power supply and supplies power to 6 groups of LED lamps and receiver amplifying circuits.
In the above process, when the power control module in the light measurement module is powered on, the LED lamp is turned on to continuously generate 6 bands of uv-visible light. Under the action of the partition board, the light path passes through the quartz capsule approximately in parallel to generate transmission and absorption, and the transmitted light outside the measuring wavelength is filtered by the optical filter. The receiver is continuously excited by the transmitted light to generate a photoelectric signal, and the photoelectric signal is amplified by the amplifier and then output.
Compared with the traditional ultraviolet-visible light measuring module, the ultraviolet-visible light measuring module has the beneficial effects that: by using the LED lamp array, the absorption of ultraviolet and visible light of 6 wave bands can be synchronously obtained in a short time, the measurement period is shortened to the second level, and the time delay caused by the operations of lamp changing and the like during the switching of the ultraviolet/visible light wave bands is avoided; the volume of the measuring module is reduced to 100 multiplied by 100mm by utilizing integrated design, and the measuring module is taken as a component part of an on-line optical water quality analysis module and has the condition of on-site deployment.
Drawings
FIG. 1 is a side sectional view of the structure of the black box part system of the present light measuring module. The figure contains the following elements: A1. a water-permeable quartz vessel; A2. a body carrier; A3. the inner structure is a round hole,
A4. the round hole of the external structure is provided with a round hole,
B1. a light source integration chassis; b2.led light sources (6 in total as shown); C1. an optical filter; C2. a silicon receiver and an amplifier circuit; C3. receiver integrated bottom plate and fixing bolt
FIG. 2 is a schematic three-dimensional structure of the main body carrier
FIG. 3 is a schematic view of the coaxial structure of each part
Detailed Description
FIG. 1 shows the structural arrangement of a measurement black box, which is a core component of a light measurement module; the whole module adopts a vertical arrangement (fig. 1 is a side sectional view along a bit line in the W direction), and is divided into three parts according to the inner part, the middle part and the outer part (the right side in fig. 1, namely the direction of the original part of the B group is defined as the inner part). The main body bearing piece (A2) made of acrylic material is a structural core of the black box part, and other components are fixed on the bearing piece through structural insertion or fixing bolts.
The middle part: the main body bearing part (a2) is a core of the structure, and is formed by processing a rectangular acrylic material with the thickness of 40mm (W) × 90mm (h) × 30mm (D), the top part to the bottom part (W × D plane) of the main body bearing part is provided with a square hole with the middle line of the W direction as a symmetry axis, the square hole is provided with 10mm (W) × 90mm (h) × 5mm (D) < penetration, and the edge of the square hole is 10mm away from the inner part (the right side in the figure 1) along the depth direction (D direction). On the inner plane (W × H plane on the right side in FIG. 1), 6 openings are formed in the depth direction (D)
The round hole is penetrated to be communicated with the square hole (namely the depth of the round hole is 10 mm); the circle centers of the round holes are all positioned on the middle parting line in the W direction, and the distance from the top to the bottom is 15 mm. Corresponding to the central axes of the 6 inner circular holes, 6 inner circular holes are opened in the depth direction (D) on the outer plane (W × H plane on the left side in FIG. 1)
The penetrating circular holes are communicated with the square holes (the depth of the 6 circular holes is 15mm), and the same central shaft is ensured to be used between the 6 penetrating circular holes inside and outside. The figures are marked with a lower dimension, including the axis
The water sample can enter and fill the quartz capsule (A1) from bottom to top to ensure that all gas in the quartz capsule (A1) is discharged and prevent the generated bubbles from interfering the measurement result.
Inside: flat cylindrical LED light sources (B2) with 6 specific wavelengths of 254nm, 273nm, 285nm, 317nm, 345nm and 455nm are sequentially assembled on a light source integrated bottom plate (B1) from top to bottom, the circle centers of all the cylindrical LED light sources (B2) are ensured to be arranged on a central line in the W direction, the distance between the circle centers of adjacent light sources is 15mm, and the adjacent light sources are connected with 6 LED light sources on a main body bearing member (A2)
The structural holes are in one-to-one correspondence. The 6 flat cylindrical LED light sources (B2) with specific wavelengths are firstly assembled on a light source integrated base plate (B1) on an optical platform, are arranged on a branch line in the W direction, are sequentially arranged according to the sequence of a lower long wave and an upper short wave, and keep the light path horizontal. The distance between the center points of two adjacent LED light sources (B2) is 15mm, and the distance corresponds to the direction of 6 structural holes on the main body bearing piece (A2). Structural hole sites on the body carrier (A2)
The structure is designed for ensuring that emergent light of each light source is relatively horizontal and adjacent emergent light does not interfere with each other, so that the ratio of the center distance of adjacent structure holes to the height of the spacing section meets the requirement<1:3, the ratio of the length to the diameter of the structural hole satisfies>2:1；
External: because the half-peak width of emergent light of the LED light source (B2) in an ultraviolet band is large (average is 5-10nm), target wavelengths of selected LED light sources in several ultraviolet regions are relatively close to- (273nm and 285nm have a 12nm difference, output peaks of the selected LED light sources in the ultraviolet regions are overlapped), the shielding by using optical filters (C1) corresponding to the wavelengths of the LED light sources (B2) one by one, and the optical filters (C1) need to transmit the half-peak width<2.5nm to ensure that there is no crossover in the wavelengths of transmitted light that can be received by adjacent silicon receivers (C2). The diameter should be selected structurally
Left and right circular filters with transmission surfaces facing the transmission light and fixed on the outer side of the main body bearing member (A2)
In the structural hole. The silicon receiver and amplifier circuits (C2) using 6 identical wide-spectrum (200-1100nm) responses were first assembled on the optical bench onto the receiver integrated backplane (C3), split-lined in the W direction, keeping the optical path horizontal, and corresponded to the structural holes on the bulk carrier (A2). The 6 silicon receivers and the amplifying circuit (C2) can share a power supply circuit, but need to be connected to a data acquisition card by using independent SMA cables to realize independent data collection; power supply and signal lines are led out from the upper part of the black box, so that water and electricity are separated, and the problem of short circuit caused by the fact that the interface of the water passing quartz capsule (A1) is disconnected due to the problem of sampling pressure is solved.
On the whole light path, light emitted by each group of LED light sources (B2) respectively passes through the corresponding internal structure round holes, vertically enters at 90 degrees and penetrates through the water quartz vessel (A1), then passes through the optical filter (C1) on the external structure round hole and reaches the silicon receiver (C2), and the structure of the main bearing part (A2) ensures that all components are on the same light path central axis and do not interfere with each other.
An external 220V alternating current power supply enters a power supply control module and is converted into 12V direct current power supply to be output; wherein, 6 paths of independent outputs are connected with 6 LED light sources (B2) in the black box to supply power for the black box, and 1 path of combined outputs are used for supplying power for an amplifying circuit of 6 silicon receivers (C2); the power control module is controlled by the command of the control mainboard, and simultaneously starts or stops 7 paths of output.
Claims (3)
1. A multi-wavelength optical measurement module taking an LED array as a core is characterized by comprising three parts;
the main body bearing piece (A2) is processed by a cuboid acrylic material with the thickness of 40mm (W) multiplied by 90mm (H) multiplied by 30mm (D), a square hole with the thickness of 10mm (W) multiplied by 90mm (H) multiplied by 5mm (D) is opened on the W multiplied by D plane by taking the W direction bisector as a symmetry axis from the top to the bottom, and the edge of the square hole is 10mm away from the inner edge along the depth direction, namely the D direction;
on the internal plane in the square hole, 6 openings are arranged along the depth direction (D direction)
Penetrate through the round hole to be communicated with the square hole, 6
The depth of the penetrating round holes is 10 mm; 6 are
The circle centers of the penetrating round holes are all positioned on the middle line in the W direction, and the adjacent holes are adjacent
The penetrating circular holes are spaced by 15mm from top to bottom;
corresponding to the central axes of the 6 inner circular holes, 6 inner circular holes are arranged on the outer plane except the square hole along the depth direction, namely the D direction
Penetrating the round hole to communicate with the square hole, 6 of the holes
The depth of the penetrating circular hole is 15mm, and the same central shaft is used between the inner penetrating circular hole and the outer penetrating circular hole;
the quartz capsule (A1) is inserted into the square hole of the main body bearing member (A2), and water sample enters from bottom to top and fills the quartz capsule (A1);
the 6 LED light sources (B2) with different wavelengths are sequentially arranged according to the sequence of the lower long wave and the upper short wave, and the light path is kept horizontal; the 6 light sources are respectively arranged on 6
Penetrate through the circular hole, are respectively connected into 6 power supply lines and are uniformly led out to the power supply linesA source control module;
6 identical receivers and amplifying circuits (C2) are respectively arranged in the 6 receivers
In the penetrating circular hole of (2), above
The diameter is indicated.
2. The LED array-based multi-wavelength optical measurement module of claim 1, wherein: the LED light sources are assembled in sequence from top to bottom by using flat cylindrical LED light sources with 6 different wavelengths, namely 254nm, 273nm, 285nm, 317nm, 345nm and 455 nm.
3. The LED array-based multi-wavelength optical measurement module of claim 1, wherein: using 6 filters respectively placed in 6 filters
In the through-going circular hole.
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