Abstract
In the process of gas measurement using non-dispersible UV detection technology, the quality of optical signal is directly related to the inversion of concentration. Traditional methods of improving the quality usually processed the detector signal directly, which destroy useful information, and is difficult to eliminate the overall interference of the environment to the detector. The analog circuit system for interference cancellation is designed based on active noise control (ANC) in the paper. The interference channel is added to obtain external noise signal, which through inverting, amplitude and phase adjustment superimposed on the measurement signal by the ANC system, and the digital potentiometer AD5263 is control to optimize by the MCU. The simulation results show that noise standard deviation decrease from 75.16mv to 10.27mv. And the correlation between the processed signal and the NO2 concentration reached 0.99768, which shows the system can be applied suitably in the non-dispersible technology.
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