ZHOU Pei-li2, ZHANG Ji-long1, WANG Zhi-bin1. Design of detecting circuit of weak current in photo ionization sensor[J]. 2011, 30(4): 108-110. DOI: 10.13873/j.1000-97872011.04.045.
component selection and manufacturing technique of a low-frequency extremely weak current signal amplifying circuit is introduced.This amplifying circuit is an important part of photo ionization sensor
and it can be also applied in other detecting systems.The experiments indicate that the circuit restrain noise effectively.It has good sensitivity and linearity.