Two-channel optical fiber method and sensor for measuring turbidity

A measurement method and dual-channel technology, applied in the field of sensor measurement, can solve the problems that the measurement system does not realize temperature compensation, does not consider the influence of temperature on turbidity detection, and cannot realize remote data transmission, etc., so as to achieve low cost and improve use Effects of life and extended measurement range

Active Publication Date: 2015-05-06
CHINA AGRI UNIV
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  • Application Information

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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 desi

Method used

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  • Two-channel optical fiber method and sensor for measuring turbidity
  • Two-channel optical fiber method and sensor for measuring turbidity
  • Two-channel optical fiber method and sensor for measuring turbidity

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Embodiment Construction

[0060] The invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0061] like figure 1 As shown, the fiber optic turbidity sensor of this embodiment is composed, in the figure:

[0062] Optical measurement module 1, including signal generator 2, two-way gate 4, LED drive circuit, LED1 light source 7 with a wavelength of 880nm, LED2 light source 8 with a wavelength of 660nm, two radiation fibers, four receiving fibers, four Sapphire lens and corresponding filter, four photodetectors and corresponding sapphire lens and band-pass filter; signal generator 2, rectifier 3, dual-channel gate 4, LED drive circuit periodically gate two wavelengths Different LED light sources, every 1S, the 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 resistance for collecting the temperature signal of the water body;

[0064] The si...

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Abstract

The invention discloses a two-channel optical fiber method and two-channel optical fiber sensor for measuring turbidity. The method is characterized in that a detection mode adopting double light sources, four laser beams and four photo-electricity is adopted, and the double different-wavelength light sources can be alternately lightened by an optical measuring module, so that 90-degree scattered lights and transmission lights can be alternately measured; a temperature measuring module is used for collecting temperature signals of water; a signal adjusting module is used for processing collected turbidity signals and temperature signals; a data processing module is used for calculation and treatment so that turbidity values and a temperature values are generated, and the in-site collecting data are transmitted to an upper computer. The different-wavelength light sources are simultaneously measured so that the stray light impact on turbidity measurement is eliminated; the external impact on the light signals is avoided through optical fiber transmission, thus the method has the high-temperature and high-pressure resisting performances and the anti-electromagnetic interference performance; temperature compensation is performed on the measured turbidity values so as to improve the measurement precision of turbidity. In-site online detection for the turbidity values is realized by the method, thus the method is high in sensitivity, excellent in linearity, low in cost and easy to carry and install, and the method is applied to narrow detection space and occasions where detected liquid is limited in capacity.

Description

technical field [0001] The invention relates to a turbidity measurement method and sensor for water quality monitoring, 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 clear water is. Because the water contains suspended and colloidal particles, the original 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 particles in the water. These particles may protect harmful microorganisms from being removed during the disinfection process. Turbidity is therefore a very important parameter in drinking water, industrial processes or products. High turbidity means high content of various toxic and harmful substances in the water. Therefore, the turbi...

Claims

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Application Information

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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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