Article
Chemistry, Analytical
Juan Wang, Chenying Shen, Juncheng Lu, Chaofeng Yang, Qiong Wu, Daru Chen, Jie Shao
Summary: This study demonstrates the rapid and accurate measurement of microbiological total viable counts (TVC) using a wavelength-modulated tunable diode laser based on absorption spectroscopy (WM-TDLAS). The technique can effectively detect CO2 in sealed culture bottles and has a detection limit of 71.8 ppm. It also shows good correlation with the conventional method and can save at least 36 hours in obtaining results within the detection range of 1-8 log10(CFU/mL).
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Optics
Zongtai Li, Zhenhai Wang, Remy Mevel, Weitian Wang, Xing Chao
Summary: Fabry-Perot etalon is commonly used to study the wavelength response of tunable diode lasers to changes in injection current. However, for rapidly scanned and modulated tunable diode lasers, analyzing the wavelength-to-time response using an etalon can be time-consuming and tedious. This report presents a MATLAB-based graphical interface that allows for semi-automatic analysis of etalon data. A comprehensive practical guide for using this application is provided in the paper.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Article
Optics
Wenke Liang, Minghao Wang, Guangfen Wei, Yonghan Fang, Zhenyang Zhao
Summary: A composite algorithm based on two-frequency modulation technology and empirical mode decomposition is proposed to suppress the noise of the fixed-point wavelength modulation spectroscopy system. Experiments show that two-frequency modulation can effectively suppress interference fringes, and the new composite method can significantly improve the denoising effect of two-frequency modulation.
OPTICS COMMUNICATIONS
(2023)
Article
Spectroscopy
Mingli Zou, Liqun Sun, Xuan Wang
Summary: A near-infrared dual-gas sensing system based on wavelength modulation spectroscopy (WMS) was developed for sensitive and accurate simultaneous detection of methane and ethane. By processing the detected light intensity signal using a digital quadrature lock-in amplifier, first and second harmonic signals were obtained, enabling the detection of methane and ethane.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Multidisciplinary Sciences
Chao Xiang, Junqiu Liu, Joel Guo, Lin Chang, Rui Ning Wang, Wenle Weng, Jonathan Peters, Weiqiang Xie, Zeyu Zhang, Johann Riemensberger, Jennifer Selvidge, Tobias J. Kippenberg, John E. Bowers
Summary: Silicon photonics enables integration of optical functionalities on chip, and our approach of heterogeneously integrated laser soliton microcombs provides a route for large-volume, low-cost manufacturing of chip-based frequency combs. These devices can output single-soliton microcombs with a 100-gigahertz repetition rate and offer laser frequency noise reduction, showing potential for next-generation high-capacity transceivers, data centers, and mobile platforms.
Article
Optics
Shaomin Li, Liqun Sun
Summary: ln-WMS is a linear method for wavelength modulation spectroscopy that remains effective even for large absorbance, utilizing natural logarithms of transmitted intensity. By minimizing the first harmonic within the non-absorbing region, a seeking algorithm is used to determine the proper demodulation phase. The accuracy and efficiency of ln-WMS were confirmed in water vapor experiments, showcasing its potential for various applications.
CHINESE OPTICS LETTERS
(2021)
Article
Optics
Yanqi Zhang, Felipe Guzman
Summary: In this paper, a fiber-based two-wavelength heterodyne interferometer is proposed as a compact and highly sensitive displacement sensor. The effects of periodic errors due to imperfect spectral separation on displacement measurement are investigated, and algorithms to mitigate these effects are proposed.
Article
Instruments & Instrumentation
Wenke Liang, Guangfen Wei, Aixiang He, Hui Shen
Summary: A novel wavelength modulation spectroscopy (WMS) technique is proposed, which improves detection sensitivity by adding a triple frequency modulation current. Experimental results verify theoretical expectations, and this method can be applied for detection of other gas molecules.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Fanghao Lu, Lijun Xu, Yigong Wu, Zhang Cao
Summary: A novel downsampling scheme was proposed to directly extract a precise and bias-immune absorption spectrum for dynamic gas temperatures. Multiple direct absorption profiles were generated by downsampling the absorbed wavelength-modulated laser intensity at equal phases in each modulation cycle. These profiles were employed to remove intensity biases from thermal radiations and obtain an entire absorption spectrum. Experimental results showed that the proposed method achieved higher precision and noise reduction compared to direct absorption spectroscopy and wavelength modulation spectroscopy methods. It also successfully evaluated the temporal variations of an acoustically excited flame.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Spectroscopy
Shaomin Li, Liqun Sun
Summary: In this paper, the technique of Natural Logarithm Wavelength Modulation Spectroscopy (ln-WMS) and the application of the eta-seeking algorithm were introduced. The effectiveness of the technique was validated through simulations and experimental measurement of water vapor. The linearity between the amplitudes of harmonics and concentration was established, even with large absorbance.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Engineering, Electrical & Electronic
Mingli Zou, Liqun Sun, Xuan Wang
Summary: We proposed a six-gas simultaneous detection system based on wavelength modulation spectroscopy (WMS), using five different lasers combined with a wavelength division multiplexer to detect the six gases. The gases were measured using frequency division multiplexing (FDM) and time division multiplexing (TDM) principles. A Raspberry Pi was used for data processing and displaying the detected gas concentrations. The system exhibited fast response time, compact size, and high detection sensitivity, making it promising for dissolved gas analysis (DGA) in transformer oil and other material aging processes.
IEEE SENSORS JOURNAL
(2022)
Article
Optics
Przemyslaw ChmielowskI, Michal Nikodem
Summary: In this paper, a continuous-wave widely wavelength-tunable fiber laser based on erbium- and bismuth-doped fibers in parallel configuration is experimentally demonstrated. A diffraction grating is used for wavelength tuning, and a tuning range of 268 nm is achieved, which is significantly greater than previously demonstrated erbium or bismuth doped fiber lasers in the same spectral region.
Article
Engineering, Chemical
Jing Sun, Yuxiao Song, Dongxin Shi, Feifei Wang, Yong Yang, Pengyu Yao, Binghong Song, Yang Yu, Chenyu Jiang, Bingqiang Cao
Summary: This paper introduces a CO2 measurement system designed using DLWMS technology, which can assess the infection situation by automatically and rapidly detecting the concentration of CO2 produced by microorganisms in the blood. The research results show that this technology has high accuracy and fast response, meeting the requirements of clinical applications.
Article
Engineering, Electrical & Electronic
Harith Ahmad, Siti N. Aidit, Muhamad Z. Samion, Siyi Wang, Yu Wang, Jayanta K. Sahu
Summary: The study presents a tunable dual-wavelength Brillouin-bismuth fiber laser with stable dual-wavelength lasing and the potential for low phase noise source for microwave generation, demonstrating tuning capability at different frequency spacings.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Moritz Bartnick, Gayathri Bharathan, Thorsten A. Goebel, Ria G. Kraemer, Stefan Nolte, Camille-Sophie Bres
Summary: We have developed a widely tunable mode-locked thulium-doped fiber laser based on a robust chirped fiber Bragg grating (CFBG). By applying mechanical tension and compression, the CFBG achieved an overall tunability of 20.1 nm, ranging from 2022.1 nm to 2042.2 nm. The mode-locked pulse train from this fiber laser has a repetition rate of 9.4 MHz, average power of 12.6 dBm, and pulse duration between 9.0 ps and 12.8 ps. This is the first demonstration of a tunable mode-locked thulium-doped fiber laser operating beyond 2 μm using a CFBG as a wavelength-selective element.
Article
Nanoscience & Nanotechnology
Zhenhua Tang, Shuhai Jia, Fei Wang, Changsheng Bian, Yuyu Chen, Yonglin Wang, Bo Li
ACS APPLIED MATERIALS & INTERFACES
(2018)
Article
Instruments & Instrumentation
Pengfei Zhao, Bo Li, Zhenhua Tang, Yang Gao, Hongmiao Tian, Hualing Chen
SMART MATERIALS AND STRUCTURES
(2019)
Article
Polymer Science
Zhenhua Tang, Shuhai Jia, Xuesong Shi, Bo Li, Chenghao Zhou
Article
Physics, Applied
Fei Wang, Shuhai Jia, Yonglin Wang, Zhenhua Tang, Jun Dong, Shunjian Xu
APPLIED PHYSICS LETTERS
(2019)
Article
Nanoscience & Nanotechnology
Zhenhua Tang, Shuhai Jia, Chenghao Zhou, Bo Li
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Instruments & Instrumentation
Shiping Li, Hu Liu, Zicai Zhu, Xiaofei Sun, Zhenhua Tang, Yan Guo, Qiao Hu, Yong Zhang
Summary: Three typical ionic polymer materials, Nafion, poly(vinylidene fluoride)/ionic liquid (IL/PVDF) composite, and thermoplastic polyurethane/ionic liquid (IL/TPU) composite, were compared for their sensing properties under applied pressure. Nafion sensor's sensitivity was highly influenced by ambient humidity, while IL/TPU and IL/PVDF sensors were stable in humidity but sensitive to IL content. IL/PVDF sensor with 50 wt.% IL content showed the best sensing performance in air and is promising for practical applications.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Materials Science, Composites
Zhen-Hua Tang, Yuan-Qing Li, Pei Huang, Hao Wang, Ning Hu, Shao-Yun Fu
Summary: In this paper, a comprehensive analytical model is developed to predict the electro-mechanical response of conductive CNT-based composite sensors by considering critical factors such as CNT dimensions, interphase, nanotube waviness, and dispersion state. The key factors were found to play important roles in determining the sensitivity of CNT-based composite strain sensors, and the validity of the developed model was demonstrated through comparisons with existing numerical and experimental data. The developed model provides a deeper understanding of the piezoresistive behavior of CNT-based composite sensors compared to existing models, and a meaningful recommendation is made to optimize the design of highly sensitive CNT-based composite sensors.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Composites
Zhen-Hua Tang, Yuan-Qing Li, Pei Huang, Ya-Qin Fu, Ning Hu, Shao-Yun Fu
Summary: The study developed an effective and comprehensive analytical model to predict the electrical conductivity of CNT/polymer nanocomposites by considering the effects of CNT waviness and dispersion. Results indicated that both CNT waviness and dispersion significantly impact the composite conductivity. The predicted results aligned well with experimental data and showed higher accuracy compared to previous models.
COMPOSITES COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Hongchen Wang, Ruicong Zhou, Donghai Li, Linrong Zhang, Guozhang Ren, Li Wang, Jinhua Liu, Deyang Wang, Zhenhua Tang, Gang Lu, Gengzhi Sun, Hai-Dong Yu, Wei Huang
Summary: The study presented a high-performance foam-shaped strain sensor composed of Ti3C2Tx MXene, multiwalled carbon nanotubes (MWCNTs), and thermoplastic polyurethane (TPU), with a wide working strain range and outstanding sensitivity. The sensor is lightweight, easily processable, and suitable for detecting various human movements, showing great potential in flexible and wearable electronics.
Article
Nanoscience & Nanotechnology
Zhen-Hua Tang, Shan-Shan Xue, Yuan-Qing Li, Zi-Cai Zhu, Pei Huang, Shao-Yun Fu
Summary: A mold-free, scalable, low-cost, and environmentally friendly thermofoaming strategy is proposed to fabricate microdome-patterned composites, which are then coated with highly conductive graphene to prepare a microstructured pressure sensor with better overall sensing performance. The electromechanical response model and finite-element analysis are used to clarify the sensing mechanisms of the pressure sensor.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Composites
Shan-Shan Xue, Zhen-Hua Tang, Wei-Bin Zhu, Yuan-Qing Li, Pei Huang, Shao-Yun Fu
Summary: This article introduces a new strategy to significantly enhance the electrical and sensing performance of flexible strain sensors by tailoring the segregated conductive networks (SCNs) structure. By incorporating thermally expanded microspheres (TEMs) into CNT/Ecoflex composites and post-processing the internal microstructures, the SCNs are reconstituted, leading to greatly improved electrical conductivity, percolation threshold, and sensitivity. The post-processing concept presented here offers a universal technology platform for enhancing the performance of conducting polymer composites (CPCs) in practical applications.
COMPOSITES COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Wang Fei, Jia Shu-hai, Tang Zhen-hua, Wang Yong-lin
CAILIAO GONGCHENG-JOURNAL OF MATERIALS ENGINEERING
(2018)
