Dr. Kai Zhang Profile

Dr. Kai Zhang

at Anhui Institute of Optics and Fine Mechanics CAS

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Publications (2)

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Proceedings Article | 18 January 2019 Paper

The design of motor vehicle exhaust carbon monoxide concentration detection system based on tunable diode laser absorption spectroscopy

Yi-bing Lu, Wen-qing Liu, Yu-jun Zhang, Kai Zhang, Dong-qi Yu

Proceedings Volume 10839, 108390I (2019) https://doi.org/10.1117/12.2504900

KEYWORDS: Carbon monoxide, Signal detection, Absorption spectroscopy, Tunable diode lasers

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As motor vehicle exhaust emission causes more and more serious pollution in recent years, the natural environment and human health are facing great threats. It is of great significance to accurately measure the concentration of carbon monoxide, as one of the main pollutants of vehicle exhaust emissions. The detection system based on tunable diode laser absorption spectroscopy (TDLAS) is featured by high resolution, high sensitivity and fast response. Besides, TDLAS can eliminate the interference of the remaining gas by using tunable and narrow linewidth characteristics of semiconductor lasers, and selecting the single absorption line of specific gas, and finally realize the gas concentration inversion of high precision. Based on TDLAS, the motor vehicle exhaust component CO concentration detection system was designed and realized by using DFB laser with the center wavelength of 2330nm and selecting the absorption lines of CO gas at 2333nm. The hardware composition and software design of the system were introduced. In the experiment, motor vehicle exhaust of different vehicles was collected, and spectrum data obtained through the system components were used for CO concentration inversion. To improve the signal-to-noise ratio of the system and reduce the detection limit of the system, the balance detection technology was used in the system. Experiments show that the system has excellent stability, and can ensure accurate inversion of concentration results, and meet the real-time on-line detection of vehicle exhaust CO concentration.

Proceedings Article | 25 October 2016 Paper

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, 101560E (2016) https://doi.org/10.1117/12.2244559

KEYWORDS: Modulation, Amplifiers

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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.

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