Digital lock - in amplifier based on dsp and sampling adc 的數(shù)字鎖定放大器
Lock - in amplifiers 鎖定放大器
A computer controls the whole process of measurements by communicating with the lock - in amplifier via rs232 interface 計(jì)算機(jī)通過rs232接口與鎖相放大器通信,控制測(cè)量的全過程。
A lock - in amplifier is used to supply the driving signal and to detect the output signal corresponding to the sample ' s strain 使用鎖相放大器提供驅(qū)動(dòng)信號(hào),并同時(shí)檢測(cè)對(duì)應(yīng)于樣品形變的輸出信號(hào)。
Photoelectric detecting circuit is constituted of four parts , i / v conversion , lock - in amplifier , low - pass filter and operation 光電檢測(cè)電路由四部分組成,分別是i / v轉(zhuǎn)換環(huán)節(jié)、鎖相放大環(huán)節(jié)、低通濾波環(huán)節(jié)、運(yùn)算環(huán)節(jié)。