Absolute spectral radiance luminance responsivity calibrating system utilizing wide tunable laser

Abstract

The invention relates to an absolute spectral radiance luminance responsivity calibrating system utilizing a wide tunable laser, which comprises a two-dimensional moving platform, wherein the two-dimensional moving platform is controlled by a computer through a stepping motor control box; a standard detector and a detector to be calibrated are arranged on the two-dimensional moving platform. The absolute spectral radiance luminance responsivity calibrating system also comprises a calibrating light source, wherein the calibrating light source comprises an integrating sphere and a tunable lasersystem; the emitting light of the tunable laser is guided into the integrating sphere and emitted at a light outlet of the integrating sphere to form the calibrating light source; the standard detector and the detector to be calibrated are sequentially aligned to the center of the light outlet of the integrating sphere to detect by the motion of the two-dimensional moving platform; the standard detector calibrates the absolute spectral radiance luminance of the light source of the integrating sphere, and a response signal of the detector to be calibrated is divided by the absolute spectral radiance luminance of the light source of the integrating sphere to obtain the absolute spectral radiance luminance responsivity. The invention can carry out whole machine calibration on a wave band typeradiance luminance detector, the calibrating parameter comprises the absolute spectral radiance luminance responsivity, and the stability and the linearity of the responsivity, and the calibrating precision of the spectral radiance luminance responsivity is effectively improved.

Description

technical field [0001] The invention relates to the fields of remote sensing science and optical radiation measurement, in particular to a set of experimental devices for calibrating the absolute spectral radiance responsivity of sensors. Background technique [0002] Precise spectral characterization of band-type radiance detectors requires the calibration light source to have the following requirements: (i) high spectral resolution; (ii) light source area filling the detector field of view; (iii) uniform radiance; (iv) relatively High radiation flux levels. For traditional calibration light sources, including lamp-monochromator systems and integrating sphere light sources with built-in lamps, one or more of the above requirements must be reduced due to their own characteristics. Tunable lasers have the following advantages: narrow spectral linewidth, high spectral radiant flux, good wavelength accuracy, and wavelength tuning in a wide range. The integrating sphere can fo...

AI Technical Summary

Problems solved by technology

Although the calibration method based on radiation sources has a long history and mature technology, it is difficult to improve the accuracy and cannot meet the needs of quantitative remote sensing for high-precision radiation calibration.

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