Device for testing absolute spectrum transmittance and uniformity thereof of off-axis multi-lens space camera

Abstract

The invention provides a device for testing absolute spectrum transmittance and uniformity thereof of an off-axis multi-lens space camera, belongs to the field of space optics, and aims at solving the problem of the off-axis multi-lens space camera that only the average transmission in a broadband is tested, or the transmission at some single wavelength position is tested, and the transmission of each wavelength position in the whole band cannot be tested. The device is characterized in that an all-band collimated radiating lighting source is fixed on a precise moving guide rail; the radiating light emitted by the all-band collimated radiating lighting source can be adjusted to be parallel to an optical axis of an optical system of the off-axis multi-lens space camera and then is imaged on a focus plane after passing through the optical system; an absolute spectrum radiation receiver is fixed the precise moving guide rail; an light inlet of the absolute spectrum radiation receiver can be adjusted to be reach the focus plane; a main control computer sends a control instruction to a controller, the controller controls the precise guide rail to drive the all-band collimated radiating lighting source to move, and the precise guide rail drives the absolute spectrum radiation receiver to move, so as to test the spectrum radiation quantity at different positions in the length direction of the focus plane.

Description

technical field [0001] The invention belongs to the field of space optics, and in particular relates to an off-axis multi-reflection space camera absolute spectral transmittance and a uniformity testing device. Background technique [0002] Transmittance is one of the important technical indicators of space cameras. The space camera adopts an off-axis multi-reflective optical system with a long focal plane to achieve a large field of view and wide coverage. With the development of space camera technology and multispectral and hyperspectral technology, the absolute spectral transmittance of space cameras has been paid more and more attention, and the absolute spectral transmittance has a direct impact on the imaging performance of space cameras. The main mirror of the off-axis multi-mirror optical system of the space camera is relatively long, generally greater than 800mm, and the length of the focal plane is generally greater than 300mm. Therefore, after the assembly of th...

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Problems solved by technology

[0004] In order to solve the problem that the existing off-axis multi-reflection space camera only tests the average transmittance of a wide band, or tests the transmittance at a single wavelength position, it cannot test the transmittance at each wavelength position in the full band. Problem, the present invention proposes a set of testing devices for the absolute spectral transmittance and its uniformity of off-axis multi-reflection space cameras

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