A method of target material recognition based on spectral emissivity curve matching is proposed to solve the problem of target material recognition in complex field environment. In this paper, the target material recognition model of spectral emissivity curve is established, and the effectiveness of the model is verified by simulation experiments. The model input data is the spectral emissivity measurement data of the target material to be measured. The model construction mainly includes weighted deviation maximization model construction, Lagrange function extremum method solution and similarity function construction. Through the simulation experiment model, the similarity between different curves is calculated and the target is effectively identified. The influence of spectral emissivity noise on similarity is analyzed. The target spectral emissivity superposition noise amplitude is 0.01 ~ 0.05 times, and the similarity is greater than 0.6. This method can accurately identify the target material. The spectral emissivity identification method proposed in this paper can provide technical support for target identification in complex
In response to the demand for remote detection of high-temperature target spectral radiation, a detection method using a large-aperture grating spectrometer is proposed and a detection system is developed. The detection system is mainly composed of a large aperture Cassegrain optical lens, a 380nm~1000nm grating spectrometer, a1000nm~2450nm grating spectrometer, the long-wave infrared imaging aiming detection components, and the spectroscopic optical components. The detection system is placed in a two-axis turntable and the long-wave infrared imaging targeting detection component is used to aim at a remote high-temperature target. After the target spectral radiation is collected by the large-aperture Cassegrain optical lens, it reaches respectively the 380nm~1000nm grating spectrometer and the 1000nm~2450nm grating spectrometer through the spectroscopic optical components. A standard blackbody of 1000℃ is used to test the performance of the detection system. The test results show that the detection accuracy of spectral radiance is within 5% at most spectral points. The remote high-temperature target spectral radiation detection method proposed in this paper can provide technical support for remote target detection, analysis, and recognition.
The importance and necessity of high temperature dynamic measurement techniques is analyzed in the paper. According to the requirement of solid rocket engine test, infrared radiation thermometry technology, colorimetric measurement technology and multi-wavelength radiation thermometry technology are used in the high temperature dynamic measurement device. The device worked well under harsh environment in the test site. Testing data is analyzed during the experiment and the results match the theoretical calculation. Application analysis of high temperature dynamic measurement techniques is made. It is clearly that optical measurement technology is quite prospected in the model test.
A novel laser heating method to heat specimen rapidly and uniformly to1800K in spectral directional emissivity of infrared stealth materials measurement is proposed, and a measurement system is developed based on this method. The measurement system is mainly composed of a laser heating device, a specimen heating bin, a reference blackbody, and a infrared spectrum radiation detecting device. The spectral directional emissivities of one kind of aluminum alloy specimen at room temperature and high temperature are measured using the measurement system, every measurement is completed in 3 minutes. The results indicate that spectral directional emissivity of infrared stealth materials at high temperature can be measured using the measurement system rapidly and accurately.
Infrared imaging technology has great applications in various fields of social life, especially in the field of remote sensing. Monitoring the ground through infrared loads on satellites can explore natural resources and improve human production. However, due to limitations of equipment, space and other factors, the cost of performance calibration of space load in space is relatively high. To solve the calibration problem of spectral parameters and imaging parameters of space load in the mid-range infrared range, the parameter calibration technique is studied. The mid-far infrared space load comprehensive performance parameter calibration test system is designed by simulating the space vacuum environment on the ground, and the mid-far infrared space load can be tested in an all-round way before going into the space. The test system consists of a vacuum chamber, an infrared collimation system, a medium-far infrared monochromatic source, a standard surface source differential black body, and a series of standard targets. It can realize comprehensive calibration of spectral parameters and imaging parameters on the same device. The load to be tested is placed in a vacuum chamber to simulate a space vacuum environment. The radiation source is radiated into the vacuum chamber through an optical window to simulate ground radiation, which can achieve relative spectral responsivity, MRTD, NETD, MTF, field of view, and magnification, distortion and other parameters of the test, and achieved good experimental results. The results show that the test system can realize the calibration of the spectral parameters and imaging parameters of the mid-far infrared spatial load.
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