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Article
Optics
Shunda Qiao et al.
Summary: This Letter presents a sensitive light-induced thermoelastic spectroscopy (LITES)-based trace gas sensor using a super tiny quartz tuning fork (QTF). The QTF has a prong length and width of 3500 μm and 90 μm, respectively, with a resonant frequency of 6.5 kHz. The use of the super tiny QTF achieved a 1.64-times signal improvement compared with the commercial QTF. The system shows excellent long-term stability and a minimum detection limit (MDL) of 190 ppb with an integration time of 220 s.
Article
Optics
Yahui Liu et al.
Summary: This paper summarizes the design theory and research results of various types of multipass cells (MPCs) based on two and more than two mirrors in recent years, and introduces the applications of some processed products. The design theory of modified ABCD matrix and vector reflection principle are explained in detail. Finally, the future development trends are predicted.
CHINESE OPTICS LETTERS
(2023)
Article
Optics
Xiaonan Liu et al.
Summary: A carbon monoxide (CO) sensor based on light-induced thermoelastic spectroscopy (LITES) with a fiber-coupled multipass cell was demonstrated, showing excellent linear concentration response and system stability. The sensor achieved a minimum detection limit of 9 ppm and a calculated normalized noise equivalent absorption coefficient of 1.15 x 10(-7) cm(-1).W.Hz(-1/2).
CHINESE OPTICS LETTERS
(2022)
Article
Chemistry, Analytical
Zhengang Li et al.
Summary: This article introduces an improved photoacoustic detection setup, which increases the detection sensitivity by increasing the optical path and amplifying the acoustic signals.
Article
Optics
Lixian Liu et al.
Summary: This paper investigates the problem of multi-gas detection in photoacoustic spectroscopy using blackbody radiators. By optimizing T-resonators and applying digital signal processing algorithms, the detection sensitivity and capability are improved. The use of dimension-optimized T-resonators and wavelet denoising algorithm significantly enhances the detection performance.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Xinyu Zhao et al.
Summary: This study presents a high-sensitivity photoacoustic (PA) gas detector based on differential multi-pass cell (DMPC) for real-time online monitoring of CH4 in the atmosphere. The detector enhances PA signal using DMPC, achieving a minimum detection limit of 0.6 ppb, demonstrating high sensitivity and reliability.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Acoustics
Haoyang Lin et al.
Summary: This paper presents an on-beam QEPAS sensor utilizing a custom QTF as a photoacoustic transducer, demonstrating improved sensitivity for H2O and CO2 detection through optimization of AmR geometry and coupling distance. The system performance was further enhanced by adjusting the laser beam focus position.
Article
Acoustics
Yufei Ma et al.
Summary: This paper reports on the performance of quartz tuning fork (QTF) based laser spectroscopy sensing using multiple QTFs. Two resonance frequency matching methods are proposed to avoid degradation of sensor performance. Experimental results validate the effectiveness of the proposed methods.
Article
Acoustics
Hanping Xiao et al.
Summary: This paper proposes and demonstrates an ultra-sensitive all-optical PAS gas sensor using a near-infrared diode laser, fiber-optic microphones, and a double channel differential T-type photoacoustic cell. The sensor shows high sensitivity and a flat frequency response, making it suitable for CH4 detection with a low minimum detection limit.
Article
Acoustics
Andrea Zifarelli et al.
Summary: This study reports on a gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) that can detect multiple gas species for environmental monitoring applications, utilizing a Vernier effect-based quantum cascade laser as the excitation source. The sensor can detect several gases, including carbon monoxide (CO), nitrous oxide (N2O), carbon dioxide (CO2), and water vapor (H2O), with high accuracy and minimum detection limits. It has been successfully calibrated and tested for monitoring gas concentrations in indoor laboratory air.
Article
Optics
Zhengang Li et al.
Summary: A high-sensitivity differential Helmholtz photoacoustic cell based on multiple reflection was reported, achieving a long absorption path and noise reduction. The technology achieved an extremely low detection limit for methane within a short detection time.
Article
Chemistry, Analytical
Xiaonan Liu et al.
Summary: This paper demonstrates a temperature measurement method based on the tunable diode laser absorption spectroscopy (TDLAS) technique using a single diode laser. The TDLAS system showed advantages such as immunity to laser wavelength shift, simple system structure, reduced cost, and increased system robustness. The system was tested on a McKenna flat flame burner and a scramjet model engine, and exhibited excellent dynamic range and fast response.
Article
Acoustics
Shunda Qiao et al.
Summary: In this paper, an ultra-highly sensitive light-induced thermoelastic spectroscopy (LITES) based HCl sensor using a custom low-frequency QTF and a fiber-coupled MPC was demonstrated. The results showed that the low-frequency QTF provided improved signal enhancement compared to a standard QTF, and the fiber-coupled MPC enhanced system robustness. The sensor exhibited an excellent linear response to HCl gas concentration.
Article
Acoustics
Xiaonan Liu et al.
Summary: A highly sensitive hydrogen fluoride (HF) sensor based on light-induced thermoelastic spectroscopy (LITES) technique is reported in this study. The sensor utilizes a simple structure and a robust shallow neural network (SNN) fitting algorithm for denoising the spectroscopy data. The system stability is demonstrated through Allan variance analysis and a low minimum detection limit (MDL) is achieved.
Article
Optics
Daoqian Yang et al.
Summary: The needle probe presented in this study allows for photoacoustic viscoelasticity measurements at a depth of 1 cm below the sample surface. The feasibility of this technique was demonstrated on gelatin phantoms and in vitro biological tissues, showing great potential for in vivo tumor boundary detection.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
Xukun Yin et al.
Summary: A ppb-level H2S and CO photoacoustic spectroscopy gas sensor was developed using a two-stage commercial optical fiber amplifier with a full output power of 10 W. The sensor employed near-infrared diode lasers and a time-division multiplexing method for simultaneous detection. A dual-resonator structural photoacoustic cell was designed for achieving low background noise and minimum detection limits.
Article
Acoustics
Zhenfeng Gong et al.
Summary: This paper introduces an optimized T-type resonant photoacoustic cell for methane gas detection, evaluating its performance using finite element method and thermoviscous acoustic theory. The system, including NIR DFB laser source, high-speed spectrometer, and fiber-optic acoustic sensor, achieves high sensitivity and a minimum detectable limit.
Article
Chemistry, Multidisciplinary
Yexiang Jiao et al.
Summary: This paper presents an integrated spherical photoacoustic cell (SPAC) for trace methane gas detection. The SPAC, in combination with a high-speed spectrometer and a distributed feedback laser source, forms a photoacoustic spectroscopy (PAS) system for CH4 detection with a minimum detection limit of 126.9 parts per billion (ppb). The proposed SPAC features an integrated, miniaturized, and all-optical structure for remote and long-distance trace gas detection.
APPLIED SCIENCES-BASEL
(2021)
Article
Acoustics
Ziting Lang et al.
Summary: A gas sensing method based on QEPTS demodulated by QTF sensing acoustic wave is proposed in this study, which can avoid laser irradiation on QTF and achieve better detection sensitivity. The experimental results show that the method has an enhanced SNR compared to traditional QEPTS.
Article
Optics
Lijun Deng et al.
Summary: Photoacoustic microscopy (PAM) has rapidly developed into a noninvasive biomedical imaging technique, using low-cost and small-size laser diodes as alternative light sources to achieve miniaturization and integration. By employing a reflective objective, a compact visible LD-based PAM system has been able to achieve long working distances and high resolution imaging, successfully reproducing subcutaneous microvascular networks in mouse ears.
CHINESE OPTICS LETTERS
(2021)
Article
Optics
Guangjie Zhang et al.
Summary: This study introduces a simple method to substantially increase the view angle in photoacoustic imaging (PAI) with the help of two US reflectors. Both phantom and in vivo animal study results demonstrate that imaging quality can be greatly improved without sacrificing imaging speed.
CHINESE OPTICS LETTERS
(2021)
Article
Optics
Bo Zhang et al.
Article
Optics
Huadan Zheng et al.
Article
Engineering, Electrical & Electronic
Ke Chen et al.
SENSORS AND ACTUATORS A-PHYSICAL
(2018)
Article
Chemistry, Analytical
Ke Chen et al.
SENSORS AND ACTUATORS B-CHEMICAL
(2018)
Article
Optics
Yufei Ma et al.
Article
Optics
I. E. Gordon et al.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2017)
Article
Instruments & Instrumentation
Qixin He et al.
INFRARED PHYSICS & TECHNOLOGY
(2016)
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Chemistry, Analytical
Justin Rouxel et al.
SENSORS AND ACTUATORS B-CHEMICAL
(2016)
Article
Optics
Yufei Ma et al.
Article
Optics
Kun Liu et al.
Article
Chemistry, Analytical
J Uotila et al.
VIBRATIONAL SPECTROSCOPY
(2005)
