Ultraviolet imager out-of-band spectrum stray light depth cut-off method
An ultraviolet imaging and depth technology, applied in the field of space optical remote sensing, can solve the problems of excessive dependence on optical filters and high development costs, and achieve the effect of simple system structure, low cost, and high signal-to-noise ratio
Inactive Publication Date: 2014-09-03
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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[0003] The purpose of the present invention is to solve the problem of excessive reliance on filter technology for spectral stray light control in the development of ultraviolet imagers and the resulting high development costs, and propose a method for ultraviolet imager depth cut-off band spectral stray light
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[0024] The object of the present invention is the 300nm channel of the ultraviolet limb imager developed by Changchun Optics. The lens system filters out most of the out-of-band stray light through the ultraviolet narrow-band filter, and finally gathers the image on the focal plane.
[0025] attached figure 1 It can be used to represent the relative intensity change of ultraviolet radiation and visible / infrared radiation before and after the actual signal passes through each component of the ultraviolet edge imager. It can be seen that the ultraviolet and visible / infrared spectral radiation with a maximum difference of 4 orders of magnitude at low altitudes from 0km to 40km passes through the ultraviolet After the limb imager, the ultraviolet working band is only attenuated by less than 3 times, while the visible / infrared spectrum signal is at least attenuated to 10 -6 the following;
[0026] attached figure 2 Measure the reflectivity of the front plane reflector of the UV...
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The invention relates to an ultraviolet imager out-of-band spectrum stray light depth cut-off method which comprises the following steps: reflecting atmospheric radiation into an ultraviolet imager through a reflection optical element; carrying out transmission through a plurality of transmission optical elements; and carrying out filtration through a narrow band optical filter, wherein each transmission optical element is plated with an ultraviolet antireflection film, of which the transmissivity is 96% and the above within a working wave band and the reflection rate reduces 5-10 times beyond the working wave band; the reflection optical element is plated with an ultraviolet high-reflective film, of which the transmissivity is 98% and the above within the working wave band and the transmissivity reduces 5-10 times beyond the working wave band; and the cut-off rate of the narrow band optical filter beyond the ultraviolet working wave band is at least 4OD. According to the ultraviolet imager out-of-band spectrum stray light depth cut-off method, the narrow band optical filter technology which is mainly depended by the out-of-band stray light controlling in the past is dispersed to the reflection, transmission and optical filter elements, so that with the application of the three elements, signals in the system ultraviolet working wave band are guaranteed, and meanwhile, the influence of out-of-band stray light is greatly reduced.
Description
technical field [0001] The invention belongs to the technical field of space optics remote sensing, and relates to a method for cutting out-of-band spectral stray light, in particular to a method for ultraviolet imager depth cut-off of out-of-band spectral stray light. Background technique [0002] The strong absorption and scattering of ultraviolet radiation by trace gases such as ozone in the atmosphere makes the low-altitude ultraviolet radiation from 0km to 40km weaker than visible / infrared radiation by 2 to 4 orders of magnitude. The level of stray light is a very important indicator in the development of remote sensing instruments. In order to ensure the reversibility of the detection signal in the ultraviolet band, the simulation calculation shows that the out-of-band spectral stray light of the ultraviolet remote sensing instrument must be controlled within 10 -6 Above the order of magnitude, the total stray light signal must be better than 1%. At present, ultravio...
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IPC IPC(8): G01J3/02G02B1/11G02B1/10G02B5/20
Inventor 王淑荣黄煜杨小虎
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI