Application of laser absorption spectroscopy for identification gases in industrial production processes and early safety warning

Zhirong, 张志荣 Zhang; Pengshuai, 孙鹏帅 Sun; Tao, 庞涛 Pang; Zhe, 李哲 Li; Hua, 夏滑 Xia; Xiaojuan, 崔小娟 Cui; Bian, 吴边 Wu; Qiming, 徐启铭 Xu; Fengzhong, 董凤忠 Dong

doi:10.3788/ope.20182608.1925

Cited by 6 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, letW (U ) = α∈U W (e(α)),W = α∈J W (e(α)),T (U ) = α∈U W (t(α)), andT = α∈J W (t(α)). Using a result about the weighting function [3], the number of bins generated by First Fit (FF) on a set U i is bounded byW (U i ) +T (U i ) + 1 + 1. This implies that the total number of bins w Algorithm1 ≤…”

Section: Optimization Algorithm For Heterogeneous Communicationmentioning

confidence: 99%

See 1 more Smart Citation

UAV Cluster-Based Video Surveillance System Optimization in Heterogeneous Communication of Smart Cities

2020

View full text Add to dashboard Cite

Video surveillance system is the integration of computers, networks, communications, and video CODEC, etc. Because of its distributed architecture, parallel image processing and ease of installation and expansion, it is widely used in many fields such as education, transportation and industry. However, there are some challenges of video surveillance applications in smart cities such as large scale of video events, low quality and big delay of video data transmission, and the loss of video surveillance data integrity. In order to solve the above problems, this paper designs a series of optimization algorithms and scheduling strategies based on Unmanned Aerial Vehicle (UAV) cluster. Firstly, we construct a full device coverage network with UAV cluster in heterogeneous communication environment of smart cities. Secondly, we formulate the scheduling problem of UAV cluster as bi-objective fragile bin packing problem, and design an optimal scheduling algorithm with constant approximation performance ratio. The simulation experimental results fully demonstrate the effectiveness, feasibility and robustness of the proposed solution in terms of system life cycle, video decodable frame rate, the ratio of UAV flight time to system life cycle, throughput and delay. INDEX TERMS Smart city, video surveillance, unmanned aerial vehicle (UAV) cluster, scheduler, bin packing, heterogeneous communication.

show abstract

Section: Optimization Algorithm For Heterogeneous Communicationmentioning

confidence: 99%

“…as safety production monitoring [3], automatic pipeline [4], automatic driving [5], and intelligent transportation [6], etc.…”

Section: Introductionmentioning

confidence: 99%

UAV Cluster-Based Video Surveillance System Optimization in Heterogeneous Communication of Smart Cities

2020

View full text Add to dashboard Cite

show abstract

基于波长调制光谱非线性特征的气体浓度宽量程检测方法

Wang Qianjin,

Sun Pengshuai,

Zhang Zhirong

et al. 2024

中国激光

View full text Add to dashboard Cite

Objective Tunable diode laser absorption spectroscopy, a commonly used gas concentration detection technology, has the advantages of noncontact realtime measurement, high sensitivity, and strong selectivity. It includes direct absorption spectroscopy and wavelength modulation spectroscopy. Compared to direct absorption spectroscopy, wavelength modulation spectroscopy technology has a strong antiinterference ability, higher sensitivity, and lower detection limit; it has been widely used in environmental monitoring, industrial gas detection, combustion diagnosis, and other fields. However, realtime widerange detection of gas concentration has increasingly become a necessity. For example, the volume fraction of methane in coal mines and petrochemical pipelines varies from 0% to 100%, and the water vapor in air fluctuates significantly. Therefore, there is an urgent need for a new 0511001 -7 研究论文第 51 卷第 5 期/2024 年 3 月/中国激光 method for widerange detection of gas concentration in petrochemical pipelines, coal mines, and other fields.Methods To meet the requirements of widerange detection of gas concentration in many fields, this study utilizes the high sensitivity characteristics of wavelength modulation spectroscopy, examines the nonlinear characteristics of wavelength modulation spectrum (WMS -NL), and then achieves high sensitivity and wide range detection of gas concentration using the wavelength modulation method. According to the principle of laser absorption spectroscopy, the Taylor expansion of the absorption term is analyzed. Specifically, linear approximation and cubic polynomial approximation of the Taylor expansion are adopted at low concentration (low absorbance) and high concentration (high absorbance), respectively. Moreover, methane (CH 4 ) is taken as an example to verify the feasibility of this method in the widerange detection of gas concentration. Additionally, combined with the three parameters of absorption line intensity, effective optical length, and gas concentration, the specific details of the method are described based on the calculation of the absorbance of CH 4 .Results and Discussions Based on experimental verification, this method can achieve the detection of CH 4 volume fraction in the range of four orders of magnitude (1.5×10 -6 -10000×10 -6 ). The volume fractions below and above 1000×10 -6 (the corresponding integrated absorbance is below and above 0.0236) are detected separately, and there is a good linear correlation between the inverted concentration and the standard concentration. The correlation coefficients in both the low and high concentration ranges are 0.999. In addition, combined with this method, the error, detection limit, and stability of the CH 4 detection system are analyzed. In the range where the volume fraction exceeds 1000×10 -6 , the maximum relative measurement error is 0.93% and the absolute error is 92.1× 10 -6 . Similarly, in the range where the volume fraction is lower than 1000×10 -6 , the maximum relative measurement error is 4.00% and the absolute error ...

show abstract