Solution concentration monitoring method and device based on Brewster law

Abstract

The invention discloses a solution concentration monitoring method and device based on a Brewster law. The method comprises the following steps: obtaining a solution sample to be tested; generating linearly polarized light; enabling the linearly polarized light to be irradiated to the surface of the solution sample to generate reflection and refraction, and receiving and observing reflection light; regulating an angle for the linearly polarized light to be injected into a liquid level, measuring and recording an acute angle included angle, i.e., an extinction angle, between the linearly polarized light and a horizontal direction at the moment when reflection light disappears; according to the Brewster law, solving a solution refractive index; according to a relationship between the solution refractive index and concentration, calculating to obtain the concentration of the concentration sample. The device has the advantages of simple structure, easiness in implementation, convenience in operation, high accuracy and low cost and can be used for monitoring the change of the solution concentration on line.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a solution concentration monitoring method and device based on Brewster's law. Background technique [0002] At present, optical measurement technology has been quite mature and has been widely used in many fields. On-line monitoring of solution concentration is of great significance in the fields of chemical industry, medicine, beverage, papermaking, food, etc. It is an important technical means to ensure and improve product quality. At present, there is no domestic monitoring of solution concentration based on Brewster's law. equipment. At present, the measurement of solution concentration mainly adopts the following methods: [0003] (1) Evaporation separation method. Take part of the solution and measure its mass, after heating to evaporate the water, measure the mass of the remaining solute, and calculate the mass percent concentration of the solution. [000...

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Problems solved by technology

[0011] (3) A device for transmitting refracted light signals needs to be inserted into the solution, and finally the refracted light is received by the detector, and the optical path design is complicated

[0012] (4) The solution should be kept in a light-transmitting state, and the light always passes through the solution to be tested vertically. The light-absorbing substance is a uniform non-scattering system, and the cost of the instrument is relatively high.

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