Imaging simulation becomes an effective and necessary way to see how the wide-field sensor performs because design and analysis of a wide-field sensor requires a lot of rigid conditions. Here, a long-wave infrared panoramic scanning sensor is designed for small target detection. Space-based imaging simulation based on the characteristics of the panoramic scanning sensor is realized. Serial images covering 360°×10° field of view is generated. Stars, long-distance satellites, and space debris appear as point sources in the images. It is demonstrated that the panoramic scanning sensor has the capability of observing a long-distance small target and can be used for space target detection.
CCD is a charge-coupled device, which is a new type of solid-state imaging device. It is an analog integrated circuit chip developed on the basis of large-scale silicon integration process. In the process of photoelectric countermeasures, the CCD detector is the core device of optoelectronic equipment. Due to its sensitivity to light, and the focusing effect of the optical system, the CCD is easily damaged by the laser interference, causing the system to be paralyzed and huge losses. So studies on the damage mechanism of laser to CCD detector and characteristics of different laser damage to CCD become the key technology of CCD protection. The temperature rise of the CCD detector after laser irradiation leads to thermal saturation of the device, changes in internal microstructure, thermal strain and thermal stress, and thermal and mechanical effects are important causes of damage. The CCD detector mainly comprises a multi-layer material such as a Si substrate and a SiO<sub>2</sub> oxide layer light-shielding film. When the laser irradiates the surface of the detector, since the SiO<sub>2</sub> layer is thin, the laser energy is hardly absorbed, and the laser energy is completely absorbed by the Si substrate material. The laser irradiation on CCD detector can be simplified as the thermal action of the laser on the Si material. Using finite element analysis, combined with the structural characteristics and heat transfer theory of CCD detector, the theoretical model of laser irradiated CCD detector is established. The temperature and stress of the detector after laser irradiation are numerically analyzed, and the Si base of the detector is calculated. The temperature and thermal stress distribution at the interface between the bottom layer and the SiO<sub>2</sub> oxide layer and the intersection of the two are discussed. The damage mechanism of the laser irradiation detector is discussed, and the continuous laser and the repetitive pulse laser pair detection are compared under the same average power density. The calculation results show that under the condition of constant average power density, detector irradiated by the repetitive pulsed laser has higher temperature and higher stress; the thermal stress of the SiO<sub>2</sub> oxide layer is larger, and the opaque aluminum film layer and the SiO<sub>2</sub> layer may separate, while the Si material mainly suffered compressive stress and the stress value is small, and the possibility of damage is small.
One of the main tasks of the spacecraft is to carry out long-term spaceflights, science research and other activities. For different scientific applications, we need to know about the strain of cabin for evaluating the health condition of spacecraft. Here, two factors mainly work. One is the temperature, and another is refueling operations. For the latter, it is necessary to carry out the unscheduled refueling for life or experiments. The advantages of FBG sensor is suitable for application in aircraft. This paper shows the detection of static and dynamic strain under in flight environment of a certain aircraft by FBG sensors and resistance strain gauge. In the static strain detection, taking the resistance strain gauge as measurement standard, FBG sensors have a large measurement error. For example, for testing position "A", the initial error is around 28.13%. After thermal compensation of bulkhead for FBG sensors, error value reduces to 5.95%. After thermal compensation of bulkhead both for FBG sensors and resistance strain gauge, error value reduces to 0.36%. In the dynamic strain measurement, the impact test of different positions in the same height and different heights on the same position for the bulkhead is carried out. The results show that the two measurement methods are accordant in high frequency and able to identify impact signals effectively. It is very important for structure prediction and health assessment.