Liquid refractive index CCD real-time measuring device and measuring method

Abstract

The invention relates to a liquid refractive index CCD real-time measuring device, wherein the lower end of the inside of a dark cassette is provided with a luminescent element, a diaphragm with a light-admitting orifice is arranged above the luminescent element on the dark cassette, the upper surface of the diaphragm is provided with flat-plate transmitting glass, the upper surface of the flat transmitting glass is provided with flat-plate image display glass with an upper optical surface and a lower frosted surface, a shading cover is arranged on the left side of the dark cassette, and the upper end of the inside of the dark cassette is provided with a CCD camera which is connected with a computer through a cable. A method which adopts the measuring device to measure the liquid refractive index is as follows: liquid to be measured forms a liquid film between the flat-plate transmitting glass and the flat-plate image display glass, visible light penetrates through the light-admitting orifice, the flat-plate transmitting glass and the liquid film of the liquid to be measured to form a circular dark spot using an incident light spot as the centre of the circle on the frosted surface of the flat-plate image display glass; the CCD camera converts the received circular dark spot to a digital signal to output to the computer through a cable, and the computer calculates the refractive index of the liquid to be measured.

Description

technical field [0001] The invention belongs to the technical field of using optical means, that is, using infrared light, visible light or ultraviolet light to test or analyze materials, and specifically relates to using an interference measurement method and a schlieren method to test the refractive index of a liquid. Background technique [0002] The refractive index of liquid is not only an important optical parameter of materials, but also an important metrological parameter in industrial and agricultural production and scientific research. At present, the measurement of liquid refractive index can be divided into two categories: geometric optics and wave optics. Compared with the two categories, each has its own characteristics. The geometric optics instrument is simple in structure, easy to operate, low in the measurement conditions, and the measurement accuracy can meet the requirements. At present, the geometric optics method is more widely used in the measurement ...

AI Technical Summary

Problems solved by technology

However, the structure of the device system is complicated, the debugging is difficult, and the measurement environment conditions are high. In particular, the measurement of the liquid refractive index must first establish a corresponding standard curve with a standard sample, and then according to the measured deflection angle θ′ of the liquid with an unknown refractive index, Read the refractive index of an unknown liquid in comparison to a standard curve

Obviously its existence is the defect that the measurement process is complicated and the human measurement error is large

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