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本文描述了为测弱光用的选频放大器,当f_0=85Hz,Δf=2Hz时,噪音2×10~(-7)伏,在室温条件下用此放大器可以测到10~(-12)流明的弱光。“弱光测试”要求一台噪音低、放大倍数高、通频带窄、稳定性和线性好的选频放大器。本文简述装调“弱光测试用选频放大器”的过程中所碰到的主要问题的分析及其解决的方法和措施。弱光测试用选频放大器的性能指标:放大倍数为2.17×10~5、噪音电平为2.0×10~(-7)伏、通频带宽为2周/秒、中心频率为85.6周/秒。
This paper describes the frequency selective amplifier used to detect weak light. When f_0 = 85Hz and Δf = 2Hz, the noise is 2 × 10 ~ (-7) volts. Under this condition, the amplifier can measure 10 ~ (-12) Low light lumens. Low Light Test requires a frequency selective amplifier with low noise, high magnification, narrow passband, good stability and linearity. This article briefly describes the main problems encountered in the process of adjusting the “frequency selective amplifier for low light test” and the solutions and measures. Flicker test with frequency selective amplifier performance indicators: magnification 2.17 × 10 ~ 5, the noise level of 2.0 × 10 ~ (-7) volts, pass frequency bandwidth of 2 weeks / second, the center frequency of 85.6 weeks / second .