Light path design of automatic Abbe refractometer
An Abbe refractometer, optical path technology, applied in optics, instruments, optical components, etc., can solve the problems of affecting accuracy, high price, insensitive changes, etc., and achieve the effect of improving stability, simple structure, and improving accuracy
Inactive Publication Date: 2008-07-16
SHANGHAI PRECISION SCI INSTR
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Problems solved by technology
[0011] 1. The optical path is complex and there are many optical components, which will inevitably cause difficulties in optical path debugging. Users need to have certain professional skills to operate the instrument
[0012] 2. A large number of optical components lead to high instrument costs
[0013] 3. 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
[0014] 4. The CCD array deviates from the rear focal plane of the lens, resulting in a too wide transition from the dark area to the bright area, that is, the change is not sharp, which affects the accuracy
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[0033] specific implementation
[0034] As shown in Figure 1, select a super bright yellow LED light-emitting tube with a dominant wavelength of 589.3±7nm to form a stable light source, turn on the power, and the divergent monochromatic light emitted by the light-emitting diode will form a converging lens group with a focal length of 36.9mm The light spot, the condenser lens group is composed of two convex lenses with focal lengths of 31.9mm and 26.5mm that are close together. The condenser lens group produces a convergence angle of Converging light of ±25 degrees, the converging angle can just meet the measurement requirements, the light waves passing through the tested sample enter the high refractive index prism from different directions, in order to ensure that the light wave can pass through the interface between the tested sample and the high refractive index prism Total reflection occurs at the center, and a high-refractive index prism with a base angle of 60 degrees an...
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Abstract
The invention provides an optical path design of an automatic Abbe refractometer which includes an LED optical source set and a deviation prism with high refractive index. Along the transmitting direction of a light wave emitted by the LED optical source set, a plane light sequentially passes through a collector lens set, a trapezium deviation prism with high refractive index, one waist of which is vertical to a main optical shaft of the collector lens set, an imaging lens set, the main shaft of which is vertical to the other waist of the trapezium deviation prism with high refractive index and an array CCD receiving surface on a focus plane of the imaging lens set. The whole optical path forms an optical module through an optical path seat and is arranged inside a host. The optical path design utilizes an optical path which is simpler than before for designing an automatic Abba refractometer with the advantages of light weight, small volume, high precision, and low manufacturing cost.
Description
technical field [0001] The invention relates to an optical path design of an optical measuring instrument, in particular to an optical path design of an automatic Abbe refractometer. 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 ...
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IPC IPC(8): G02B27/00G01N21/41
Inventor 孙流星
Owner SHANGHAI PRECISION SCI INSTR