Portable ground hyperspectral imager

Abstract

The invention relates to a portable ground hyperspectral imager. The portable ground hyperspectral imager comprises a lens, a liquid crystal tunable filter imaging unit, an InGaAs area array detector,an optical signal acquisition and processing module, a data acquisition module and a data recording processing module which are connected with one another sequentially; the portable ground hyperspectral imager further comprises a power source module which is connected with the liquid crystal tunable filter imaging unit, the InGaAs area array detector, the photoelectric signal acquisition and processing module, the data acquisition module, and the data recording processing module; and the portable ground hyperspectral imager also comprises a two-dimensional pointing bracket used for placing and fixing the spectral imager; and the liquid crystal tunable filter imaging unit and the data acquisition module are connected to a computer. Compared with the prior art, the portable ground hyperspectral imager of the present invention uses an optimized integral time method to obtain optimal integral time required for each band through dynamic measurement of a site, thereby compensating the inconsistency of the spectral response of a system due to factors such as LCTF diffraction efficiency, extending the dynamic range of data and improving the accuracy of data processing.

Description

technical field [0001] The invention relates to the field of ground hyperspectral measurement, in particular to a portable ground hyperspectral imager. Background technique [0002] At present, most of the imagers used for ground hyperspectral measurement are non-imaging, and the spectroscopic components are mainly gratings, using a single-point measurement method. The more famous one is the FieldSpec series of portable hyperspectral fiber optic spectrometers of the American Analytical Spectroscopy Devices (ASD) company. , while traditional imaging spectrometers mostly use push-broom or swing-broom working methods. The spectroscopic principle is mainly of prism, grating spectroscopic or interference spectroscopic type. Spectrometers with these spectroscopic principles require moving parts, have large volume and power consumption, and are not suitable for portable , low power consumption, portable ground-to-ground field hyperspectral imaging detection. Different from the tra...

AI Technical Summary

Problems solved by technology

The LCTF-based spectral imaging system has been used for close-range spectral measurement examples. Because the transmittance of light intensity is largely restricted by the diffraction efficiency of LCTF, and the quantum efficiency of image sensors in different wavelength ranges is different, resulting in different There is a large inconsistency in the spectral response of the band, especially when the spectral resolution is high. When used in field remote sensing measurements, due to the constraints of the external environment, the signal-to-noise ratio and The dynamic range brings greater difficulty to subsequent application processing

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