Device and method for measuring refractive index of liquid by utilizing linear array CCD

Abstract

The invention relates to a device for measuring liquid refractive index by using a linear array CCD (Charge Coupled Device). The device comprises a base, a rectangular container for containing liquid to be measured and the linear array CCD; a laser, an optical attenuation sheet, a beam expander, a convex lens, an objective table for fixing the rectangular container and a translation table for horizontally moving the linear array CCD are sequentially and fixedly arranged on the base along the horizontal direction; the linear array CCD is electrically connected with a linear array CCD detection module in a wired mode. The invention also provides a method for measuring the liquid refractive index by using the linear array CCD based on the device. The liquid refractive index measurement is realized, the measurement precision is obviously improved, and in addition, the device and the measurement operation are simple.

Description

technical field [0001] The invention belongs to the technical field of optical parameter measurement, and in particular relates to a device and method for measuring the refractive index of liquid by using a linear array CCD. Background technique [0002] The refractive index is one of the important parameters of the liquid. Through the refractive index, the concentration, purity and optical properties of the liquid can be known. During the manufacture and production of the liquid, it is necessary to measure the refractive index accurately in real time. It has important application value. At present, the methods for measuring the refractive index of liquid mainly include laser irradiation method, total reflection method, equal thickness interferometry, Michelson interferometry and grating diffraction method. [0003] The invention patent with the publication number CN110927110A discloses a method for measuring the refractive index of a liquid in a cuboid container. It uses p...

AI Technical Summary

Problems solved by technology

Its device and measurement operation are simple, however, it requires that the spot center of the parallel light coincides with the center of the concentric circle of the light screen, and the laser spot is small enough to meet the paraxial requirement, and it is easy to introduce a certain error by manually judging the beam center

[0004] The invention patent with the publication number CN112285059A discloses a device for measuring the refractive index of liquid based on the CCD method. Its laser beam is injected into the measuring container containing the sample to be measured from the diameter direction, and enters the sample to be measured after being refracted by it to form an optical path. The interface refraction laser converges at one point of the interface. It is necessary to detect the laser through the two optical path widths of the sample to be tested and the distance between the two widths to calculate the refractive index. The measurement of the refractive index requires a total of five measurement values, and there are many measurement values. , The measurement operation is complicated, and the refractive index of the liquid to be measured is related to the size and refractive index of the container used. In addition, there are certain measurement errors when using a scale or an electron microscope to position the measuring beam

[0005] It can be seen that the current devices and methods for measuring the refractive index of liquids all need to adjust the position of each part of the device, the measurement operation is cumbersome, and there is a certain measurement error by manually judging the center of the beam.

Images