Infrared imaging detection technology has been widely used. In the process of using infrared images for target observation, a large amount of typical target infrared radiation characteristic data is needed as infrared reference information to eliminate interference factors such as environment, time period, and false targets to achieve accurate target identification. The acquisition of typical target infrared radiation characteristic data is to use infrared characteristic measurement equipment to accurately measure the measured target under various external environments and conditions, and finally form the available target infrared radiation characteristic data through data analysis and arrangement. Since infrared target characteristic data needs to be acquired in the field, these devices generally have the characteristics of working environment in the field environment, multiple types of measurement targets, long measurement distance and wide measurement space. Therefore, in order to eliminate the influence of external environmental factors and accurately obtain the infrared characteristics of the target, it is necessary to calibrate the key parameters of the large-aperture infrared characteristics measurement equipment on the test site. However, there is currently no field calibration capability for large-aperture infrared characteristic measurement equipment, which has a negative impact on the application of infrared imaging detection systems. In order to solve the above problems, this paper develops a large-aperture long-focus optical system in an external field environment, which mainly includes a high-temperature standard infrared radiation source, a large-aperture off-axis primary mirror, a secondary mirror, and a target. After the development was completed, it was applied in the external field environment to calibrate a certain high-resolution infrared characteristic measurement equipment, and the relevant data were analyzed. The analysis results show that the uniformity measurement uncertainty is better than 0.4K (k=2), the distortion measurement uncertainty is better than 1% (k=2). And a good application effect is achieved.
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.
In this paper, a research of PMMA optical fiber reflectivity changing along with the angle of tips has been studied. A type of integrated conical fiber probe is designed. Nine angles of cone fiber tips were fabricated and tested in 0.4 L /min continuous uniform bubble flow (air) in this study to validate the performance of each cone angle. A simulation model of PMMA optical fiber tip was established based on physical properties of fiber to simulate the reflectivity of different angle tips set into gas/liquid environment. The first and second high peaks of experimental data agree well with the positions of those calculated using the simulation.
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