Optical non-chromatic-aberration focusing system
A focus system, no chromatic aberration technology, applied in the field of optical measurement, can solve the problems of lower measurement accuracy, difficult to realize, lens chromatic aberration, etc., and achieve the effect of low price and simple structure
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[0017] First introduce the Czerny-Turner structure, such as image 3 As shown, the structure is mainly composed of concave mirror B, concave mirror E and a grating D in between. The polychromatic light A from the incident slit B passes through the first concave mirror C and becomes parallel light, and the parallel light is incident on the second concave mirror E after diffracting through the grating, and the second concave mirror E makes the beam G of a specific wavelength pass through the grating Focus on exit slit F. By rotating the grating D, the wavelength of the beam G passing through the exit slit F can be changed, which is the principle of a monochromator. If a photodiode array is placed at the position of the exit slit, it becomes a grating spectrometer (see US patents US5497230, US6507398).
[0018] Compared with the Czerny-Turner structure in the prior art, the reflective focusing system of the present invention can use a low-cost spherical reflector instead of a c...
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