A light-transmitting liquid concentration detection system and detection method

Abstract

The invention discloses a light-transmitting liquid concentration detection system, which is characterized in that: the measured light-transmitting liquid is sealed in a static container; The inner wall on the other side is respectively provided with a first reflector and a third reflector. The laser beam emitted by the laser outside the container is projected to the first reflector, and then refracted by the second reflector and the third reflector in turn and then emitted. And as the detection light, the photodetector receives the position signal of the detection light spot, and obtains the concentration of the light-transmitting liquid to be measured through signal processing. The invention has high detection precision, high speed, simple structure, easy operation, wide detection range of refractive index, and can be used for real-time and rapid detection of small changes in liquid concentration.

Description

technical field [0001] The invention relates to a light-transmitting liquid concentration detection system and a detection method, belonging to the detection field. Background technique [0002] Concentration is a very important index to measure the quality of industrial products and an important physical parameter of liquid substances. Therefore, in the production of chemical, pharmaceutical, food and other industries, as well as in some scientific research, it is often necessary to accurately and quantitatively measure the concentration of specific substances in liquids. Traditional methods for measuring liquid concentration mainly include specific gravity method, chemical analysis method, ultrasonic method, optical method and so on. Although the specific gravity method has high precision, it needs to be weighed many times with an analytical balance, and can only detect the concentration of the upper surface solution; the chemical analysis method has high detection precis...

AI Technical Summary

Problems solved by technology

It uses light reflection and refraction in a tight container with a light-transmitting cover to measure the refractive index and concentration of an unknown liquid, which can achieve the purpose of quickly detecting the liquid’s refractive index. However, in this device, the number of refractions in the optical path is small, and the spot displacement Δd is small , the sensitivity is not high

[0004] In the patent "a liquid concentration detection device" with publication number 102590098A, a photoelectric element is used to detect the intensity of refracted light on the exit surface, which is costly, and the system is complicated and difficult to build

[0005] In the paper (Research on Optical Salinity Detection Technology Based on Position Sensitive Devices[J]. To change the salinity of the measured brine to obtain the relationship between the salinity and the position of the light point on the photosensitive detector, to stabilize the salinity of the brine, but the process takes a long time, which is not conducive to real-time online detection

[0006] In the paper (Performance Analysis of Photoelectric Detection System for Solution Mass Fraction [J]. Sensors and Microsystems, 2013, 31(11): 8-10.), scholars proposed to optimize the optical path and increase the light through multiple reflections. The process can effectively overcome the above defects, but the spot displacement caused by the change of unit concentration is small, and the sensitivity cannot meet the requirements

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