In order to realize space-based remote sensing for river, lake and ocean environment monitoring and break through the key technology of hyperspectral imaging system, based on the Ritchey-Chrétien (R-C) Cassegrain folding reflector telescope, we designed a front telescope system with a working altitude of 600 km, a working spectral band of 450-900 nm, a full field of view of 2.9°, a system focal length of 400 mm , the optical speed of F/4 and effective control of aberration and chromatic aberration of adding three-piece correction mirror to control the field of view is designed. The initial structural parameters of the front telescope system are solved according to the primary aberration theory, and the secondary mirror blocking ratio of the front telescope system is designed to be 0.35, and the simulation and optimization design are carried out in ZEMAX software. The system performance analysis shows that more than 80% of the energy of the imaging spot is concentrated within 12 μm.The maximum aberration is 0.78% and the maximum magnification chromatic aberration is 1.26 μm.The RMS (Rate-Monotonic Scheduling) radius of spot at all fields of view and wavelengths in the point column diagram is less than 2.6 μm (Airy radius is 3.3 μm). At the Nyquist frequency of 25 lp / mm, the MTF (Modulation Transfer Function) values of each spectral section in all fields of view are greater than 0.8.All the above evaluation indexes meet the performance requirements of hyperspectral imaging system
KEYWORDS: Sensors, Picosecond phenomena, Data acquisition, Charge-coupled devices, Analog electronics, Signal to noise ratio, Signal detection, Amplifiers, CCD image sensors, Computer architecture
The study of underwater in-situ detection is an important research trend in underwater detection. In view of the design requirements of the spectral data acquisition system for underwater in-situ detection, this paper used the software and hardware co-design method, from two aspects of software and hardware. A prototype system of spectral data acquisition system based on Xilinx Zynq chip and linear array CCD detector was designed and implemented. Through theoretical analyzing, experimental debugging and verification analyzing, the results shown that the system could collect and store the spectral data in real time. It also had the characteristics of low noise and had a small electronic structure, which laid a foundation for the spectral data acquisition of underwater in-situ detection.
In order to realize the self-test of the camera controller, based on the analysis of the basic functions and test tasks of the Star, GPS and other units, a design scheme of the camera sub-system geophysical controller is proposed, The design and implementation of the bus command, OC switch instruction, auxiliary data release and analog telemetry parameters are described in detail. The preparation of the host computer command and telemetry interface software is carried out in a large number of tests and tested with the controller, and the test results were analyzed and summarized.
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