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Dual-channel optical fiber turbidity measurement method and sensor

A turbidity sensor, dual-channel technology, applied in the field of sensor measurement, can solve the problems of not considering the influence of temperature on turbidity detection, the measurement system not realizing temperature compensation, and the inability to realize remote data transmission, etc. Effectiveness of service life and extended measurement range

Active Publication Date: 2018-04-03
CHINA AGRI UNIV
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  • Abstract
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Problems solved by technology

The measurement system can only realize online monitoring of turbidity, but cannot realize remote transmission of data
The measurement system designed by this patent does not realize temperature compensation, and does not take into account the influence of temperature on turbidity detection

Method used

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  • Dual-channel optical fiber turbidity measurement method and sensor
  • Dual-channel optical fiber turbidity measurement method and sensor
  • Dual-channel optical fiber turbidity measurement method and sensor

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Embodiment Construction

[0060] Below, the invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0061] Such as figure 1 As shown, the optical fiber turbidity sensor of the present embodiment forms, among the figure:

[0062] Optical measurement module 1, including signal generator 2, dual-way selector 4, LED drive circuit, LED1 light source 7 with a wavelength of 880nm, LED2 light source 8 with a wavelength of 660nm, two bundles of radiation optical fibers, four bundles of receiving optical fibers, four Sapphire lens and corresponding filters, four photodetectors and corresponding sapphire lenses and band-pass filters; signal generator 2, rectifier 3, dual-way selector 4, and LED drive circuit to periodically select two wavelengths Different LED light sources, every 1S, two LEDs turn on and off alternately;

[0063] The temperature measurement module 36 includes a temperature probe 37, and the probe adopts a Pt100 platinum resistor for collect...

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Abstract

A dual-channel optical fiber turbidity measurement method and sensor, using dual light sources + four light beams + four photoelectric detection methods, the optical measurement module realizes dual light sources with different wavelengths alternately emit light, and alternately measures 90-degree scattered light and transmitted light; temperature measurement module The temperature signal of the water body is collected; the signal conditioning module processes the collected turbidity signal and temperature signal; the data processing module performs calculation and processing, generates turbidity value and temperature value, and wirelessly transmits the data collected in situ to the host computer. Simultaneous measurement of light sources with different wavelengths eliminates the influence of stray light on turbidity measurement; optical fiber transmission avoids external influence on optical signals, high temperature and high pressure resistance, and anti-electromagnetic interference; temperature compensation for measured turbidity values ​​improves the accuracy of turbidity measurement precision. The in-situ on-line detection of the turbidity value is realized, the sensitivity is high, the linearity is good, and the cost is low, it is easy to carry and install, and it can be applied to occasions where the detection space is small and the detection liquid capacity is limited.

Description

technical field [0001] The invention relates to a water quality monitoring turbidity measurement method and a sensor, in particular to a four-beam optical fiber turbidity measurement method and sensor with dual light sources and dual photoelectric detectors. It belongs to the technical field of sensor measurement. Background technique [0002] Turbidity is a measure of how transparent water is. Because the water contains suspended and colloidal particles, the originally colorless and transparent water is turbid, and the degree of turbidity is called turbidity. Turbidity indicates the presence of large amounts of bacteria, pathogens, or certain particulate matter in the water. These particles may protect harmful microorganisms from being removed during the disinfection process. Turbidity is therefore a very important parameter whether in drinking water, industrial processes or products. High turbidity means that the content of various toxic and harmful substances in the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/47G01N21/59
Inventor 位耀光张力彩李道亮陈英义胡雪伦刘春红孙明
Owner CHINA AGRI UNIV
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