Large width and low distortion were the two developing trends of space remote technique. An isometric scanning system was introduced. The scanning field of view was in front of the sub-satellite point. The width of the camera was about 2006km when the orbit altitude of satellite was 705km. The distortion of the camera image was 29.3%.
In this paper, a high-speed hyperspectral target detection system based on high-efficiency spectrographs and illumination devices is proposed. The system includes a hyperspectral imager, an illumination system, and a data processing system with spectral target recognition. The system can be used for fast impurity rejection on industrial lines. By adopting a high diffraction efficiency grating and a low distortion spectral spectroscopic system, the system realizes spectral imaging with high throughput and low distortion. Compact linear light source is used to achieve high irradiance full-spectrum illumination. The edge computing system adopts a spectral target recognition method combining CTBS with RTCEM and RTRAD. The spectral range of the system is 400 nm to 1000nm, the spectral resolution is 5 nm. The system can be used for the assembly line with a transportation speed of 1m/s, and the unknown debris detection with an accuracy of more than 87% and the known debris detection with an accuracy of 96% can be carried out on debris with a size of less than 2 mm. The method proposed in this paper increases the detection speed of existing hyperspectral detection systems by more than three times, which is expected to improve the practicability of hyperspectral detection technology in the field of industrial production.
The infrared multi-spectral camera on near-space vehicle had the characteristics of high spatial resolution, high time resolution. A new dual-channel infrared multi-spectral remote sensing camera was developed. It included a middle wave (MW) channel (3.7μm~4.8μm) and a long wave (LW) channel (8μμm~12.5μm). The optical system adopted a refract system, a dichroic beam-splitter was utilized to separate LM form MW. The MW and LW channel all had five spectral bands , and filter wheel assemblies were used to split the in-coming MW and LW radiant flux into 5 spectral bands. The optical system aperture was 45mm, and the focal of the two infrared channels were 62.5m. The full field modulation transfer function (MTF) of MW channel was over 0.67, and the MTF of LW was over 0.329. The focal of MW and LW channel had 640×512 pixels, and the pixel size was 25μm. Because of the high integrated design, the total weight of the camera was 18.5kg. The camera would be used to monitor the fire and the forest fires and marine pollution on a airship.
KEYWORDS: Black bodies, Body temperature, Calibration, Temperature metrology, Resistance, Control systems, Satellites, Platinum, Infrared radiation, Cameras
This article elaborates on the working principle of the on-board blackbody calibration system, through the high-performance design and accurate index accuracy of the key indicators of high and low large-aperture surface blackbody (effective emission surface normal emissivity, temperature stability, temperature uniformity) Effective control, so as to obtain high and low temperature blackbody normal emissivity 0.98, temperature stability ≤ ± 0.15K/30min, temperature uniformity ±0.25K high-performance calibration indicators. By adding different thermal control measures to the high temperature black body and the low temperature black body, the temperature stability of the working temperature control interval required by each can be obtained. Among them, the temperature of the high-temperature black body is realized by applying a heat sheet with a reasonable cloth, while the temperature of the low-temperature black body is lower than the ambient temperature in the camera, and the temperature compensation is realized by installing a heat sink in the cold space, and then attaching the heating sheet to the heat pipe. For both high temperature blackbody and low temperature blackbody, precision platinum resistance thermometers are used to accurately monitor their temperature in real time. By reasonably arranging the position of the platinum resistance and the platinum resistance test line, the blackbody temperature measurement accuracy can be controlled within ±0.05°C. In the end, the high-stability large-aperture blackbody calibration system through the comprehensive work of various structural components, thermal control components and the main optical system to obtain the high-precision infrared temperature calibration requirements required by the load, which provides for subsequent model development. Successful engineering experience.
The geostationary orbit water color remote sensing satellite has the unique advantage of high time resolution observation, which can accurately obtain the information of ocean color elements, coastal zone observation elements, sea surface temperature and large sea targets. The onboard optical imaging system has the characteristics of large aperture, large incident angle, wide spectrum and multi-channel detection at the same time, so it has high polarization sensitivity. In order to achieve high quantitative application of water-color remote sensing, it is necessary to reduce the influence of polarization sensitivity. According to the characteristics of the water-color remote sensing payload in geostationary orbit, the polarization sensitivity of the system is suppressed by optimizing the structure of the optical system and controlling the polarization sensitivity of the optical film. Then the polarization sensitivity of the system is simulated and modeled by CODEV software, and the macro file based on Mueller matrix is compiled to accurately calculate the polarization of the system in different spectral bands and different fields of view. The results indicated that the polarization sensitivity of the imaging system is better than 1.5% in the visible and near-infrared band.
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