Ultraviolet photoelectric microsensor device for monitoring water quality on line and monitoring method

A micro-sensor, ultraviolet light technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of large volume, large deviation of detection data, long test time, etc., to achieve safe multi-point measurement, small size, low power consumption. Effect

Inactive Publication Date: 2010-09-15
NANJING UNIV
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Problems solved by technology

[0002] Changes in water pollution will seriously affect the growth and balance of aquatic organisms. Therefore, monitoring changes in water pollution indicators is very important and has been widely used in various fields such as environmental monitoring and production process pollution monitoring. However, due to the national standard method (GB11914-89 The COD test method in ) has problems such as long test time, complicated operation, need for pretreatment, secondary pollution of chemical reagents, etc., making rapid detection difficult
Using the UV absorption spectrum of the water body to measure can achieve the goal of accurately testing water body pollution indicators, but the traditional UV detection device is bulky and difficult to achieve multi-point online monitoring
Existing on-line monitoring instruments usually use a single wavelength (usually the 254nm wavelength of a low-pressure mercury lamp) detection method, and the disadvantage is that some organic compounds do not absorb at 254nm, which makes the detection data deviate from the actual data. Therefore, , it is particularly important to realize online rapid and accurate monitoring of water pollution.

Method used

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  • Ultraviolet photoelectric microsensor device for monitoring water quality on line and monitoring method
  • Ultraviolet photoelectric microsensor device for monitoring water quality on line and monitoring method
  • Ultraviolet photoelectric microsensor device for monitoring water quality on line and monitoring method

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Embodiment 1

[0015] Embodiment 1: the embodiment that is used for the ultraviolet photoelectric miniature sensor device of on-line monitoring, see figure 1 , the ultraviolet light source is a light source composed of multiple ultraviolet LEDs. The UV detector consists of 6 GaN-based Schottky UV detectors (including 5 AlGaN and 1 InGaN). AlGaN and InGaN can be used as laboratory samples or commercial products, and their response window covers the LED wavelength range; There is a water tank between the light source 1 and the ultraviolet detector 2, which can evenly flow the water flow samples to be monitored. The ultraviolet detector 2 data acquisition and transmission module, the above data acquisition and transmission module can also be composed of a data acquisition card and a wireless transmission module. Including data acquisition and transmission functions; the power supply can be solar cells, dry batteries or rechargeable batteries; the support 5 is made of metal materials; the sealin...

Embodiment 2

[0016] Example 2: Monitoring of water pollution index COD.

[0017] This method was applied to the water quality of Qinhuai River in Nanjing for on-line COD monitoring test. The ultraviolet light source (1) is composed of 6 ultraviolet LEDs, and the center wavelengths are 220nm, 255nm, 280nm, 300nm, 365nm, 400nm; the ultraviolet detector (2) is composed of 6 GaN-based Schottky ultraviolet detectors (5 AlGaN and 1 InGaN), the response wavelength corresponds to the center wavelength of the above-mentioned LED; the data acquisition and transmission module (3) is composed of a single-chip microcomputer, and the single-chip microcomputer is responsible for data collection and transmission; the power supply (4) is a solar cell, for ultraviolet The LED in the light source (1) and the data acquisition and transmission module (3) are powered, the solar panel is placed on the street light pole by the river, and the ultraviolet light source (1) and the data acquisition and transmission m...

Embodiment 3

[0019] Can refer to Chinese patent CN200810196207.5, the ultraviolet light source adopts the ultraviolet LED light source of Seoul Company. Establish the functional relationship between ultraviolet spectrum data and COD Embodiment, the functional relationship between COD and ultraviolet absorbance UVA preset by the server 8 is: COD=A+B*UVA255+C*UVA300, parameters A, B, and C are preset according to different modes Corresponding values ​​(corresponding to the setting values ​​of urban lake mode A=4.4, B=14, C=27). The ultraviolet light source is a light source composed of 3 ultraviolet LEDs, the center wavelengths are 255nm, 300nm, 400nm respectively, and the ultraviolet detector is composed of 3 GaN-based Schottky ultraviolet detectors (including 2 AlGaN and 1 InGaN), 2 The absorbance UV255 and UV300 at 255nm and 300nm measured by an AlGaN detector subtract the absorbance UV400 at 400nm measured by an InGaN detector to obtain the absorbance UVA255 and UVA300 values ​​at 255nm ...

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Abstract

The invention discloses an ultraviolet photoelectric microsensor device used for monitoring water quality on line, which comprises an ultraviolet light source, an ultraviolet detector, a data acquisition and transmission module, a bracket and a seal cover. A water flow sample to be monitored is placed between the ultraviolet light source and the ultraviolet detector, wherein the ultraviolet light source and the ultraviolet detector are fixed on the bracket, two ends of the ultraviolet light source are connected with a power supply through a lead, and two ends of the ultraviolet detector are connected with the data acquisition and transmission module through a lead. The ultraviolet photoelectric microsenser device is characterized in that the ultraviolet light source, the ultraviolet detector and the stand are encapsulated in the seal cover, the ultraviolet detector comprises a GaN based Schottky type ultraviolet detector, and a response window of the ultraviolet detector corresponds to the center wavelength of an LED; and the ultraviolet light source consists of 3-7 ultraviolet LEDs with the wavelength covering a region ranging from 200nm to 400nm. The device has small volume and low power consumption, can timely and accurately monitor the change conditions of environmental pollution indexes (such as TOC (Total Organic Carbon), COD (Chemical Oxygen Demand) and the like), and has wide application prospect.

Description

1. Technical field [0001] The invention relates to a method for monitoring water quality pollution indicators and a water quality pollution indicator monitoring device using the method, which are used in the fields of water quality pollution monitoring and pollution treatment. 2. Background technology [0002] Changes in water pollution will seriously affect the growth and balance of aquatic organisms. Therefore, monitoring changes in water pollution indicators is very important and has been widely used in various fields such as environmental monitoring and production process pollution monitoring. However, due to the national standard method (GB11914-89 The COD test method in ) has problems such as long test time, complicated operation, need for pretreatment, secondary pollution of chemical reagents, etc., making rapid detection difficult. Using the ultraviolet absorption spectrum of the water body to measure can achieve the goal of accurately testing the water body pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 陈敦军张开骁胡立群张荣郑有炓
Owner NANJING UNIV
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