Wide-range linearity testing device and method of ultraviolet spectrum remote sensing instrument

Abstract

The invention discloses a wide-range linearity testing device of an ultraviolet spectrum remote sensing instrument. The wide-range linearity testing device comprises an ultraviolet light source, an ignition power supply, a neutral dimming sheet, a diffusion plate, a guide rail and a testing module, wherein the ultraviolet light source, the neutral dimming sheet and the diffusion plate are mountedon the guide rail, and the diffusion plate is mounted at one end, close to a spectrograph to be detected, of the guide rail; the neutral dimming sheet is arranged between the ultraviolet light sourceand the diffusion plate and is close to the diffusion plate; the ultraviolet light source is used for providing ultraviolet radiation required by a linearity test of the spectrograph; the neutraldimming sheet is used for reducing radiation intensity of the ultraviolet light source and expanding alinear test range of the spectrograph; the diffusion plate is used for converting light emitted by theultraviolet light source into an area light source so as to fill the field of view of the spectrograph; the test module is used for recording signal output in aspectral band of the spectrograph to betested and drawing a spectral intensity curve when the ultraviolet light source and the diffusion plate are located at different positions; and whether the spectrograph to be testedis linear or not isdetermined according to the spectral intensity curve.

Description

technical field [0001] The invention relates to the technical field of spectral remote sensing instruments, in particular to a large-scale linearity testing device and method for ultraviolet spectral remote sensing instruments. Background technique [0002] For spectral remote sensing instruments, it is very important to measure the linearity within the range. In order to measure its linear characteristics, one method is to use the point light source, its irradiance on a certain area is inversely proportional to the square of the distance from the area to the point light source, that is, using the inverse square law of irradiance, to carry out Linearity measurement. The disadvantage of this method is that it is limited by the point light source assumption, the distance measurement error and the length of the guide rail, and it is not suitable for the measurement of linearity in a large range. Another method is the dual-aperture stacking method. That is, the field of view ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the test of the linearity of a large-range ultraviolet spectrometer in the prior art needs a large-scale change of light source intensity and a special long guide rail; a kind of spectrometer linearity test device based on the combination of distance change and spectral intensity change is proposed

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