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对一台进口的像增强器信噪比 (SNR)测试仪进行改造 ,重新研制和设计了测试仪的信号处理模块、计算机系统和测试软件 ,采用硬件滤波、软件数字滤波和快速傅里叶变换 (FFT)相结合的方法实现了像增强器噪声的频谱特性测试。利用所研制的测试仪对多种型号的进口和国产像增强器的噪声频谱进行了测试分析 ,并给出了分析测试结果。
An imported signal-to-noise ratio (SNR) tester such as booster was modified, and the signal processing module, computer system and test software of the tester were re-developed and designed. Hardware filtering, software digital filtering and Fast Fourier Transform (FFT) method to achieve the image intensifier noise spectral characteristics of the test. Using the developed tester, the noise spectra of many kinds of imported and domestic image intensifiers were tested and analyzed, and the analysis and test results were given.