Design of polarization direction detection circuit

Abstract In the polarized light angle measurement system, it is important to detect polarization direction of linearly light. First, principle introduced, and then detection circuit designed. This receives intensity output signal from Polarization State Analysis converts an electrical signal. The filtered, amplified, sampled, integrated obtain a stable useful waveform. judged by waveform, which plays role in field realizes accurate measurement. simulation results show that can weak signals achieve 71.45 dB–97.95 dB adjustable gain. A clear waveform be obtained. determined using has simple structure, good stability, easy realization.