Detection system and detection method for concentration of light-transparent liquid

Abstract

The invention discloses a detection system for the concentration of light-transparent liquid. The detection system is characterized in that detected light-transparent liquid is enclosed in a standing container; a second reflecting mirror is arranged on the inner wall of one side of the standing container; a first reflecting mirror and a third reflecting mirror are respectively arranged on the inner wall, opposite to the second reflecting mirror, of the other side of the standing container; laser beams emitted by a laser device outside the container are projected to the first reflecting mirror and then are sequentially refracted by the second reflecting mirror and the third reflecting mirror; the emitted light after refraction is used as detection light; a photoelectric detector receives a detection light spot position signal; the detection light spot position signal is processed to obtain the concentration of the detected light-transparent liquid. The detection system disclosed by the invention has the advantages of high detection precision, high speed, simple structure, easiness for operation and wider refractive index detection range, and can be used for quickly detecting small change of the liquid concentration in real time.

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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