Design And Application Of Transmissive Imaging Spectrometer Components

Imaging spectrometer provides both spectral information and spatial information of the target object. It has the characteristic of image-spectrum merging and is developing rapidly. This technique is widely used in agricultural remote sensing, land resources survey, rock and mineral exploration, military reconnaissance, marine monitoring and so on.Based on the analysis of principle, a method for designing transmission and component-based imaging spectrometer system was proposed. The transmission system reduced the influence of stray light and multi diffraction. General optical components were used to simplify the construction and reduce assembly difficulty. This system is with wider application rang and lower cost compared to traditional imaging spectrometers. According to the overall scheme of system, telescope system and spectral imaging system were designed. Two sets of optical systems with different objective lenses were simulated and optimized in the ZEMAX. Parameters such as distortion, MTF and aberration were also analyzed in this software.The system device of imaging spectrometer was built with generic components. The spectral calibration and performance testing were performed in laboratory conditions. The result demonstrates that the system has good ability in distortion control and spectral resolution is2nm. A data acquisition system was designed. The software that combines push broom control and image acquisition was developed. According to the specificity of hyperspectral data, the corresponding methods about non-uniformity correction processing and image mosaics are discussed.Two groups of experiments about fruit nondestructive detection using this device achieved desirable results, which provide a new way to design fast online testing system for produce.