Differential solution concentration measuring method and device based on CCD (Charge Coupled Device) and trapezoidal glass body

Abstract

The invention provides differential solution concentration measuring method and device based on a CCD (Charge Coupled Device) and a trapezoidal glass body. The method uses the characteristic of laser, the relationship between liquid concentration and refractive index and the optical refraction and reflection principles. The method comprises the following steps that: incident light penetrates through a liquid and then goes into the trapezoidal glass body through the breach of a wedge slot in the middle of the trapezoidal glass body, and the incident light is divided into two beams, goes out of the glass body from the trapezoid slopes at the ends after being reflected many times in the glass, and is then received by the CCD through the liquid. Since the liquid concentration is related to the refractive index, the refraction angle of the incident light is changed when the concentration is changed, and the reflection angle of the light beam in the glass is accordingly changed, thereby changing the distance between two image patches of the light beams going out of the two ends of the glass on the CCD, therefore, the distance between the image patches on the CCD can be related to the liquid concentration, and the liquid concentration can be measured by the distance between the image patches. The invention has the advantages of simple structure and easy arrangement, can measure the change of the liquid concentration in real time, and can operate in the corrosive or other severe industrial environments.

Description

technical field [0001] The invention relates to a liquid concentration measuring method. The invention also relates to a liquid concentration measuring device. Background technique [0002] In petroleum, chemical industry, metallurgy, food, medicine and other industrial fields, it is necessary to measure the concentration of the solution. In the traditional optical measurement method of liquid concentration, such as Abbe refractometer, the measurement range is relatively small, and online and automatic measurement cannot be realized; while the concentration measurement with polarimeter is only suitable for optically active solutions, and online and automatic measurement cannot be realized. , because it depends on the human eye to judge whether the brightness of the three-point field of view is the same, it is easy to produce large errors. [0003] With the advancement of modern optical technology and optoelectronic technology, the precision manufacturing technology and per...

AI Technical Summary

Problems solved by technology

This method approximates the relationship between the minimum deviation angle and the concentration as a linear fit, and the error is large when measuring the deviation angle, which is easily affected by the external environment and has low sensitivity.

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