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为使红外探测器在振动干扰的环境下仍具有足够高的探测率,必须降低其因振动而产生的噪声幅度。控制探测器振动噪声的主要手段之一是控制其机械振动幅度,尤其是共振振幅。采用锤击法,利用冲击激励的宽频特性,研究了金属结构红外探测器的共振特性及影响振动噪声的力学因素。通过改变探测器结构的动力学特性,探寻了减振降噪的几种途径。实验结果表明,探测器悬臂冷指的结构参数对探测器的振动特性起主要作用。在冷指自由端与壳体间填胶做支撑、或冷指固定端与壳体间用胶粘隔振的减振降噪效果最好,可使振动噪声降至原值的1/20。
In order to make the infrared detector still have a sufficiently high detection rate in the environment of the vibration interference, the amplitude of the noise caused by the vibration must be reduced. One of the main measures to control the vibration noise of the detector is to control its mechanical vibration amplitude, especially the resonant amplitude. By using the hammering method and using the broadband characteristics of impact excitation, the resonance characteristics of metal structure infrared detectors and the mechanical factors affecting vibration and noise are studied. By changing the dynamic characteristics of the detector structure, several ways of vibration and noise reduction are explored. The experimental results show that the structure parameters of detector cantilever finger play the main role on the vibration characteristics of the detector. In the cold finger between the free end of the shell and the plastic filler to do support, or cold finger between the fixed end and the shell with vibration isolation vibration damping the best noise reduction, vibration noise can be reduced to the original value of 1/20.