Abbe refractometer and light path realization method

Abstract

The invention relates to an Abbe refractometer, which comprises an LED light source group, a linear array CCD receiving surface and a light path seat, and is characterized by also comprising a condensing and refracting component, wherein the condensing and refracting component has a sample measuring surface, an incident surface and an exit surface; the incident surface of the condensing and refracting component is perpendicular to a hole axis in the light path seat which is perpendicular to the luminescentsurface of the LED light source group; the exit surface of the condensing and refractingcomponent is parallel to the linear array CCD receiving surface; the incident surface of the condensing and refracting component is an incident surface of a planoconvex condenser lens; and the exit surface of the condensing and refracting component is a waist surface of a prism. In the invention, the automatic Abbe refractometer has the advantages of light weight, small volume, easy production and assembly, low manufacturing cost, large measurement range and simple operation, and the precision of the Abbe refractometer is one magnitude order higher than the traditional Abbe refractometer.

Description

technical field [0001] The invention relates to the field of optical measuring instruments, in particular to an Abbe refractometer and an optical path realization method. Background technique [0002] Refractive index is one of the important physical constants of matter. Many pure substances have a certain refractive index. If there are impurities in them, the refractive index will change, and there will be deviations. The more impurities, the greater the deviation. Therefore, by measuring the refractive index, the purity of the substance can be determined. Abbe refractometer (also known as Abbe refractometer) is an instrument designed according to the principle of total reflection of light. It uses the method of measuring the critical angle of total reflection to measure the refractive index of unknown substances, and can quantitatively analyze certain components in the solution. It is one of the indispensable and commonly used equipment for factories, schools and research...

AI Technical Summary

Problems solved by technology

[0012] 2. The condenser lens and prism are separated, which increases the volume of the instrument

[0013] 3. A large number of optical components lead to high instrument costs

[0014] 4. Using multiple LED light source groups to achieve large-scale measurement makes the system more complex, bulky, and expensive, which is not conducive to the miniaturization of the instrument

[0015] 5. The CCD array deviates from the rear focal plane of the lens, causing the transition from the dark area to the bright area to be too wide, that is, the change is not sharp, which affects the accuracy

[0016] 6. Since the existing automatic Abbe refractometers all use lens imaging, and the lens always has aberrations, which restricts the further improvement of the accuracy of the existing automatic Abbe refractometers

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