Method and device for measuring turbidity

A technology of a measuring device and a measuring method, which is applied in the measurement of scattering characteristics and other directions, can solve the problems of being difficult to fully satisfy and overcome the error of window contamination, and achieve the effects of reducing temperature error, prolonging the period of manual cleaning and maintenance, and high precision.

Active Publication Date: 2012-05-09
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0012] The purpose of the present invention is to provide a turbidity measurement method and device to overcome the existing turbidity measurement device, especially the online water body turbidity probe, it is generally difficult to fully meet the ISO7027 standard, and the detection method is generally single-point detection, which is easy Affected by external factors such as temperature, it is difficult to overcome defects such as window pollution and errors introduced by light source drift

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  • Method and device for measuring turbidity
  • Method and device for measuring turbidity
  • Method and device for measuring turbidity

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Embodiment Construction

[0047] with P 0 Indicates the incident light intensity, h indicates the absorption coefficient of the sample, and k indicates its scattering coefficient. When the parallel beam passes through the sample with thickness x, the optical power should be:

[0048] P(x)=P 0 exp[-(k+h)x]

[0049] Deriving the above formula, the scattered power of a parallel beam of power P(x) passing through a sample with a thickness of dx can be obtained. For liquids with low absorption (h·x approaches 0), the scattered light power P S for

[0050] P s ( x ) = - dP ( x ) dx ≈ k · P 0 exp [ - ( k + h ) x ...

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Abstract

The invention discloses a method and a device for measuring turbidity, related to the turbidity detection technology. The method comprises the steps of irradiating an environment to be detected by using a beam of parallel light, and detecting 90-degree scattered light power in a plurality of positions in the light path of the parallel light, thus obtaining the turbidity value of the environment to be detected by performing mathematic processing on the detected value. The measuring device of the method is packaged in the form of a probe and comprises a housing, a parallel light emitting system, a photoelectric receiving system and a signal processing circuit. The light path structure is capable of satisfying 90-degree scattering detection under any condition and the volume of the device can be reduced. The method and the device provided in the invention eliminate the influence of the unstability of a light source on the measurement, reduce the interference of temperature errors and window pollution to the turbidity measurement, extend the cycle of manual cleaning and maintenance and improve the measurement accuracy. The measuring device is small in volume, low in power consumption, high in sensitivity and good in anti-jamming capability; and the device follows ISO7027 standards, and is convenient for mounting and adjustment and applicable to turbidity measurement and intelligent monitoring of various environments.

Description

technical field [0001] The invention relates to the technical field of turbidity measurement, and relates to a turbidity detection method that uses a single parallel light beam to irradiate the environment to be measured and simultaneously detects 90-degree scattered light power at multiple positions on the same side of the optical axis and at an equal distance from the optical axis. The turbidity measurement device based on the method can be used for turbidity measurement in the fields of water environment monitoring, sewage treatment, chemical industry, food medicine and the like. Background technique [0002] Optical sensor refers to the sensor whose core sensitive mechanism is the optical part. Optical sensors have many advantages such as high sensitivity, good electrical insulation, anti-electromagnetic interference, and easy miniaturization, and are especially suitable for long-term online detection. Taking water environment monitoring as an example, typical applicati...

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Application Information

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IPC IPC(8): G01N21/49
Inventor 祁志美刘桥刘瑞鹏
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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