Design of the NDUV detection circuit for the NO concentration of the vehicle exhaust emissions

Kai Zhang; Yujun Zhang; Ying He; Kun You; Yanwei Gao; Chen Chen; Guohua Liu; Chungui He; Yibing Lu; Wenqing Liu

doi:10.1117/12.2244559

25 October 2016 Design of the NDUV detection circuit for the NO concentration of the vehicle exhaust emissions

Kai Zhang, Yujun Zhang, Ying He, Kun You, Yanwei Gao, Chen Chen, Guohua Liu, Chungui He, Yibing Lu, Wenqing Liu

Proceedings Volume 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology; 101560E (2016) https://doi.org/10.1117/12.2244559
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China

Abstract

With the increasing number of vehicles, the harm from NO to the environment becomes more and more prominent. So the monitoring of the NO concentration of the vehicle exhaust emissions is very important to assess the emission levels. In this paper, the NO detection system designing for vehicle exhaust emissions based on the non-dispersive ultraviolet principle (NDUV) has been researched. The technical indexes of the two-way modulation UV signal detection circuit are discussed in detail. And then a precision detection circuit is designed, which is composed of a trans-impedance amplifier and a lock-in amplifier, with which the output of the UV photoelectric detector can be amplified to a suitable voltage range, and the DC noise of the pre-stage amplifier is effectively removed by the lock-in amplifier. An experimental system was set up to test the designed circuit. To ensure the consistency of the two channels, the method of exchange calibration was adopted in the test. It’s drawn that the designed circuit is of high SNR, measuring accuracy and a large dynamic range from the test results. The NO concentration detection limit of vehicle emissions can reach 1ppm, and the detection precision is ±15ppm.

Citation Download Citation

Kai Zhang, Yujun Zhang, Ying He, Kun You, Yanwei Gao, Chen Chen, Guohua Liu, Chungui He, Yibing Lu, and Wenqing Liu "Design of the NDUV detection circuit for the NO concentration of the vehicle exhaust emissions", Proc. SPIE 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology, 101560E (25 October 2016); https://doi.org/10.1117/12.2244559

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