Dynamic Jitter Reduction Inversion Method Based on Nondispersive Infrared
Measurement of gas volume fraction using non-dispersive infrared technology cannot avoid the effect caused by fast jitter,burr,vibration,etc.,which affect the accuracy of measurement.In this paper,a dynamic jitter reduction inversion method based on non-dispersive infrared was proposed.Through the judgment of tilt,the reset signal was extracted,and then baseline fitting and correction were performed to reduce the baseline drift.Subsequently,by automatic iterative fitting,the integral area was obtained to realize the volume fraction inversion,so as to overcome the jitter problem of the signal.And the on-board experiments were conducted in the experimental system.Experimental results show that the maximum fluctuation value amplitude of proposed method is 58.84%and the maximum fluctuation value amplitude of the differential detection method is 62.12%when the vehicle speed varies,and the correlation coefficient of two methods is 95.263,which can effectively reduce the signal jitter problem.When the vehicle speed is constant,the average value of gas volume fraction is 10.01%for the proposed method and 9.98%for the differential detection method,and the standard deviation is 0.0374 for the proposed method and 0.191 for the differential detection method,which illustrates the accuracy of the inversion volume fraction of the proposed method and improves the stability of the measurement.
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