Absolute calibration method for radiation intensity of Hadamard transform imaging spectrometer

Abstract

The invention relates to an absolute calibration method for the radiation intensity of a Hadamard transform imaging spectrometer. In the method, an integrating sphere light source, a uniform attenuation sheet, an electric translation platform capable of translating along a direction vertical to an optical axis, a Hadamard transform spectrometer, a spectrometer radiation intensity meter, a main control computer and a camera obscura are arranged, wherein the Hadamard transform spectrometer and the spectrum radiation intensity meter are fixedly arranged on the electric translation platform respectively, and are arranged at the two ends of the electric translation table along the translation direction; the electric main control computer can be used for controlling the translation of the electric translation table; the electric main control computer is connected with the Hadamard transform spectrometer and the spectrum radiation intensity meter respectively to acquire output data of the Hadamard transform spectrometer and the spectrum radiation intensity meter; and light emitted from the integrating sphere light source can vertically enter the Hadamard transform spectrometer or the spectrum radiation intensity meter after passing through the attenuation sheet. Due to the adoption of the method, the technical problem of the lack of a calibration method for the radiation intensity ofa front slot type Hadamard transform spectrum spectrometer is solved. The calibration method is simple, and has high efficiency.

Description

technical field [0001] The invention relates to a radiometric absolute calibration method of a Hadamard transform imaging spectrometer. Background technique [0002] Hadamard Transform (Hadamard Transform) is a transformation method established based on the rectangular wave orthogonal base. The core idea is to detect the superimposed signal of multi-channel linear combination, and then inversely transform the detection signal to obtain a single-channel signal. The imaging spectrometer designed and manufactured based on this transformation principle has the characteristics of high throughput and multi-channel, and the calculation amount of spectral restoration is much smaller than that of Fourier transform spectrometer. [0003] At present, the Hadamard transform spectrometer has two structural forms, one is the spatial modulation form, which combines and superimposes the spectral data of different space objects; the other is the spectral modulation form, which combines and s...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to propose a method for absolute calibration of radiance of a Hadamard transform imaging spectrometer, which solves the technical problem that the radiance calibration method of a Hadamard transform spectrometer without a pre-slit is lacking at present

Images