A water quality monitoring device based on colorimetry

Abstract

The invention discloses a water quality monitoring device based on a colorimetric method, wherein the device comprises a light transmitter, a first convex lens, a cuvette with a spherical protuberance, a second convex lens and an optical receiver. The incident light transmitted by the light transmitter is focused after being refracted by the first convex lens and a focus point is positioned at the sphere center of the cuvette spherical protuberance, so that the incident light can verticality irradiate a water sample to be detected and the optical path of the incident light in the water sample to be detected is equal, thus the incident light meets the Lambert-Beer law and the detection precision of water quality can be improved.

Description

technical field [0001] The invention relates to the field of environmental monitoring, in particular to a water quality detection device based on colorimetry. Background technique [0002] With the intensification of environmental pollution, the water resources that people rely on for survival have also been polluted to a large extent, so that people's domestic water and production water contain a large amount of harmful substances, such as trivalent chromium ions. In order to ensure the safety of people’s water use, the water sample to be tested is usually irradiated with parallel light of a specific wavelength at present, and the substance to be tested in the water sample will absorb the light energy of this wavelength, and then the water sample to be tested can be obtained through Lambert-Beer’s law. Measure the substance concentration. [0003] It should be noted that Beer's Law of Lambert requires that the incident light be vertically incident on the water sample to be...

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Problems solved by technology

However, in the actual application process, since the cuvette containing the water sample to be tested is a cylinder, the parallel incident light does not meet the requirement of perpendicular incident on the water sample to be tested, resulting in refraction of the incident light, and different positions The optical path L of the incident light is different (see figure 1 shows the optical path diagram of the existing water quality detection device), resulting in low detection accuracy

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