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Method and device for in-situ determination of chlorophyll and turbidity in water body

A measuring device and measuring method technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of decreased measurement accuracy, small optical path distance, inability to effectively detect colored substances in water bodies, etc., and achieve the effect of real-time measurement and high precision

Active Publication Date: 2016-10-05
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are two problems in the measurement of turbidity by this principle: one is that in the case of low concentration, the measurement accuracy decreases due to the small optical path distance and fewer scattering particles; the other is that in natural waters (especially aquaculture waters) It often contains colored substances such as algae. At present, commercial turbidimeters cannot effectively detect such colored substances in water bodies.
[0005] So far, there is no measurement method and measurement device that can simultaneously measure the two kinds of water quality information of water body chlorophyll and turbidity

Method used

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  • Method and device for in-situ determination of chlorophyll and turbidity in water body
  • Method and device for in-situ determination of chlorophyll and turbidity in water body
  • Method and device for in-situ determination of chlorophyll and turbidity in water body

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Effect test

no. 1 example

[0061] In this embodiment, photodiodes with two wavelength bands (410nm and 676nm) are selected as the light source 1113. Considering that when two LED light sources 1113 emit light at the same time, the corresponding photodetector 1114 will be affected by other light sources, so in this embodiment, use The I / O port in the JN5139 communication module controls the two LEDs to turn on and off in sequence. The optical path-circuit conversion unit 13 includes an amplifier circuit, a filter circuit, and a JN5139 communication module, etc., and is responsible for pre-processing, A / D conversion, and data transmission of optical signals. ZigBee technology is used to provide wireless communication services between the information measuring device 1 (consisting of multiple sensors) and the data collector 2 .

[0062] Such as image 3 As shown, the in-situ measurement device of the present invention selects LEDs with center wavelengths of 410 nm and 676 nm as the active light source 111...

no. 2 example

[0071] Such as Figure 10 As shown, in this embodiment, the processor 21 preferably adopts a PDA, which is mainly used for the control of the measurement and the coordination of the wireless network. It is preferable to embed a JN5139 communication module 121 in it to realize the wireless combination with the node of the information measuring device 1. network. The JN5139 communication module 121 receives the data wirelessly transmitted by the node 1 of the information measuring device, and then transmits the data to the PDA processor through the serial port, so as to be displayed, stored and processed on the PDA processor.

[0072] Such as Figure 11 As shown, the serial port circuit adopts the MAX3232E chip, and the power supply voltage of the chip is 3V. The chip has the characteristics of low power consumption, high data rate, and enhanced ESD protection. JN5139 communication module 121 provides two serial ports, in order to save space and simplify circuit design, realiz...

no. 3 example

[0079] 1. Determination of water chlorophyll and turbidity sensitive wavelength

[0080] Such as Figure 13 As shown, the present invention performs two-dimensional correlation calculation on the spectral data of water samples containing different chlorophyll content collected from actual aquaculture ponds, and uses synchronous correlation spectrum to analyze the band interval most sensitive to the change of chlorophyll content. The synchrocorrelation spectrum is symmetric about the main diagonal, indicating the degree of synergy between the two dynamic spectral signals. The peaks on the diagonal are obtained by the autocorrelation of dynamic spectral signals and are called autopeaks. Its intensity represents the sensitivity of chemical group changes caused by external disturbances. In the figure, autocorrelation peaks are formed at variable 410nm and 676nm, indicating that the spectral intensity at these two wavelengths fluctuates with the change of chlorophyll content. At...

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Abstract

The invention discloses an in-situ measurement method for water chlorophyll and turbidity, which comprises the following steps: 1) establishing a water chlorophyll measurement model and a water turbidity measurement model respectively; 2) establishing a node between a data collector and an information measurement device Link to the network; 3) Start the information measuring device and collect the chlorophyll and turbidity signals of the water body, and send the signals to the data collector; 4) The data collector calculates the chlorophyll content and turbidity value of the measured water body, and performs a process on the obtained data deal with. The in-situ measurement method of the present invention aims at real-time, convenient and multi-parameter measurement, and realizes simultaneous measurement of dual parameters of water chlorophyll and turbidity based on the principle of spectral reflection; in addition, the present invention also provides a water chlorophyll and turbidity The level measurement device can simultaneously measure the water quality information of the two parameters of water body chlorophyll and turbidity, and output the information for processing.

Description

technical field [0001] The invention relates to the technical field of water quality testing of water bodies, in particular to an in-situ measuring method and measuring device for water chlorophyll and turbidity. Background technique [0002] Water quality detection is the real-time monitoring, measurement, analysis and evaluation of the quality status and changing laws of water resources, and it is an important means to grasp the dynamic changes of the natural water environment and aquatic biological ecosystem. Water quality indicators can be divided into three categories: physical, chemical and biological according to the nature of the detected substances. Among them, chlorophyll and turbidity belong to the biological indicators and physical indicators in the water quality parameters respectively, which can reflect the photosynthetic biomass, productivity, eutrophication and pollution degree in the water body. Therefore, rapid and convenient determination of comprehensive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/27
Inventor 郑立华张瑶李民赞张琴孙红糜修尘
Owner CHINA AGRI UNIV
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