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针对光纤陀螺(FOG)PIN光电探测器在空间应用环境下受辐照影响暗电流增大、性能指标劣化的特性,提出了FOG空间在轨条件下PIN光电探测器工作状态开机自检方法。陀螺开机时,调节光源驱动电流使光源处于无光输出状态,此时PIN光电探测器输出噪声中主要包括由暗电流引起的低频1/f噪声和散粒噪声,通过低通滤波和低噪声放大电路使对PIN光电控制器输出信号进行预处理;根据低频1/f噪声和散粒噪声功率谱密度的特点,使用Allan方差法对经A/D转换后的数据进行分析,得到不同噪声类型的强度信息。通过PIN光电探测器的γ射线辐照试验对该方法进行了验证,试验结果表明,该方法能够有效地表征PIN光电探测器在受辐照前后1/f噪声和散粒噪声的变化。
Aiming at the characteristics that the FOG PIN photodetector is affected by the irradiation dark current and the degradation of the performance index under the environment of space application, a method of power on self-test of the PIN photodetector under the FOG space orbit is proposed. When the gyroscope is turned on, the light source driving current is adjusted so that the light source is in a state of no light output. At this time, the output noise of the PIN photodetector mainly includes low frequency 1 / f noise and shot noise caused by dark current, and low pass filtering and low noise amplification The circuit preprocesses the output signal of the PIN photoelectric controller. Based on the characteristics of low-frequency 1 / f noise and shot noise power spectral density, the Allan variance method is used to analyze the A / D converted data to obtain different noise types Intensity information. The method is verified by the γ-ray irradiation test of PIN photodetector. The experimental results show that this method can effectively characterize the 1 / f noise and shot noise of PIN photodetector before and after irradiation.