As to the video signal , alarm signal , control signal , are all weak electricity signal , exceedingly easily be subjected to the jam , in case the power supply system does not steady , wave propag ation is greatly , the harmonic content of power source overtops , the veins wave factors are great unduly , and even power source equipment breakdown , outputting abnormal , will be about to affect the video signal image effect , and dependability cuts downs to the security and alarming system . we adopt fast fu lye ' s mutation rule - fft alternatives , by the way of carrying fft alternatives to the local junction circuit , regulated power supply , ups ' s power source , and switch power source , thereby diagnose every degree harmonious wave content of power souse , and abnormal coefficient , compared to the normal working situation . thereby diagnose out the working condition of the regulated power supply , ups ' s power source , and switch power source 如果有供电系统不稳定、波动大，电源的谐波含量过高，纹波系数过大，乃至电源设备损坏、输出异常等情况出现，将会严重影响视频信号的图像效果，大大降低防盗系统的稳定性和可靠性，我们采用快速傅利叶变换原理，即fft变换，通过对市电、稳压电源、 ups电源、开关电源等的电压信号进行fft变换，从而得出信号中各次谐波的含量及信号畸变系数，并将其与正常工况下的参数进行对比，从而进一步诊断出稳压电源、 ups电源、开关电源等设备的运行状况；组成监控系统的设备长期处于工作状态，往往由于设备散热条件不好、设备老化故障等原因导致设备表面温度过高，从而影响设备的正常运行，降低设备的使用寿命。
The results of experiment indicate the precision of the interior position elements and optical lens distortion coefficient of the digital camera reaches the design requirement and meets the close shot photogrammetry requisition for the general digital camera , so this camera can be used in the close shot photogrammetry 实验结果表明，数码相机的内方位元素及物镜畸变系数的精度均已达到设计的要求，满足近景摄影测量对普通数码相机的要求，故被标定的相机可用于近景摄影测量。
