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With the development of infrared imaging detection technology, it is not enough to recognize valuable target information quickly and accurately in complex environment simply by energy and graphics. Modern infrared imaging detection and recognition systems have begun to make use of more physical features, such as dynamic or static differences of spectral energy distribution in one or more work bands, to improve the target recognition and anti-jamming ability of infrared imaging systems. Distinguishing differences in physical characteristics of objects, backgrounds or disturbances from time, space, spectrum and energy dimensions is becoming a main direction of development of IR imaging detection technology. In an effort to improve technology for performance testing and hardware-in-the-loop (HWIL) simulation of multi-spectral imagers, we have been developing a wide-band infrared spectral engine based on spatial light modulator (SLM). The wide-band infrared spectral engine is comprised of a blackbody IR source, a Digital Micromirror Device (DMD) and some optical components, and it is capable of generating the spectral distributions with programming each of the DMD’s spatial pixels. The problem of mismatch between the unit-under-test (UUT) spectral and the infrared image projector spectral in the HWIL simulation can be resolved in this way. A prototype of the wind-band infrared spectral engine has been designed and developed. A brief summary of previous work will be presented with a more detailed discussion of the recent test of the prototype. By using spectrometer, moving guide and some other devices, a set of test equipment has been built. And thought some stripe test patterns with different spatial frequencies, the key performance of the wide-band infrared spectral engine prototype has been tested. It was found that the waveband of the wind-band infrared spectral engine prototype is from 3 μm to 5μm, while the spectral control accuracy of the wavelength is less than 100 nm.
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