Dr. Chao Li Profile

Dr. Chao Li

at Qilu Univ of Technology (Shandong Academy of Sciences)

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Publications (2)

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Proceedings Article | 30 June 2021 Paper

Design of aquaculture monitoring system based on LoRa and 4G network of Internet of Things

Hao Zhang, Chao Li, Zhili Hua, Wanlong Ren, Yuan Gao, Zongrui Hao

Proceedings Volume 11878, 1187827 (2021) https://doi.org/10.1117/12.2601041

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Aiming at the problems of high cost, low efficiency, lack of systematic management and intelligent monitoring, a set of remote water quality monitoring system based on Lora technology and 4G Network is designed. The system uses solar battery as power supply, and F8L10T_LoRa as acquisition terminal module. The data of DO (dissolved oxygen), PH and temperature collected by the sensors are uploaded to F8926L_Router gateway. The gateway uses 4G Network to communicate with upper computer software. And the Kingview software is adopted to display and store the data in real time. The results show that the system can accurately obtain the data of each pond in real time, and the packet loss rate is less than 2% in the range of 5 km during the three-month test.

Proceedings Article | 4 December 2020 Paper

Detection of CO2 concentration using a fiber-optic cantilever acoustic sensor in 2.0-μm band

Fengxin Xin, Dewang Yang, Chao Li, Wei Yan, Yong Wang

Proceedings Volume 11617, 1161722 (2020) https://doi.org/10.1117/12.2585255

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Cantilever enhanced photoacoustic spectroscopy (CEPAS) technology improves the detection ability of weak gas photoacoustic signal effectively utilizing a micro-cantilever acoustic sensor instead of capacitive microphone, which can achieve highly sensitive detection of CO₂ and has great significance for environmental monitoring, industrial production control and regional carbon emission monitoring and other applications. A fiber-optic Fabry-Perot (F-P) sensor with a cantilever structure is designed in this work to overcome the disadvantage of the complication of traditional mechanical cantilever photoacoustic spectroscopy system. The photoacoustic spectroscopy system is established based on the resonance enhancement of the fiber cantilever acoustic sensor with a 2.0 μm distributed feedback (DFB) laser, which combines the technologies of wavelength modulation and second-harmonic detection for measuring CO₂ concentration. The experimental results show that the concentration calibration curve has a good correlation of 0.9765, and the detection limit of CO₂ concentration reaches 0.044×10^-6, which verifies the feasibility of the system for detecting atmospheric CO₂ concentration.

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