The Experts below are selected from a list of 20895 Experts worldwide ranked by ideXlab platform

Wentao Zhang - One of the best experts on this subject based on the ideXlab platform.

  • high resolution static strain sensor based on random fiber laser and Beat Frequency interrogation
    IEEE Photonics Technology Letters, 2019
    Co-Authors: Shuaijie Miao, Wenzhu Huang, Wentao Zhang, Ying Song
    Abstract:

    We proposed a high-resolution static strain sensor using random fiber lasers (RFLs) and the sweep-Beat Frequency interrogation technique. An RFL with 3-dB linewidth of 548 Hz and Frequency jitter of ~±70 kHz is established by random distributed gratings and a high-precision π-phase shifted fiber Bragg grating (π-FBG) ring mirror. Two RFLs act as probes and are interrogated by Frequency-swept laser. One RFL is used for strain sensing, the other is used for compensating temperature and Frequency shift of swept laser. By using sweep-Beat Frequency demodulation, a static strain resolution of 196 pico-strain (pe) is obtained in 160 s. To the best of our knowledge, this is the first time that RFLs have been used in static strain sensing based on sweep Beat-Frequency interrogation.

  • dfb fiber laser for high resolution acoustic emission detection based on Beat Frequency interrogation
    2018 Asia Communications and Photonics Conference (ACP), 2018
    Co-Authors: Qing Jia, Wenzhu Huang, Wentao Zhang
    Abstract:

    This paper proposes a compact acoustic emission (AE) detection technique based on distributed feedback fiber laser (DFB-FL) using Beat Frequency interrogation. Because of the ultra-narrow linewidth of Beat Frequency and time-Frequency analysis method, the detection system can reach a high strain resolution of 6.4×10−9 with 1 MHz demodulation speed and 400 MHz dynamic range.

  • dfb fiber laser static strain sensor based on Beat Frequency interrogation with a reference fiber laser locked to a fbg resonator
    Optics Express, 2016
    Co-Authors: Wenzhu Huang, Shengwen Feng, Wentao Zhang
    Abstract:

    We report on a high-resolution static strain sensor developed with distributed feedback (DFB) fiber laser. A reference FBG resonator is used for temperature compensation. Locking another independent fiber laser to the resonator using the Pound-Drever-Hall technique results in a strain power spectral density better than Se(f) = (4.6 × 10−21) e2/Hz in the Frequency range from 1 Hz to 1 kHz, corresponding to a minimum dynamic strain resolution of 67.8 pe/√Hz. This Frequency stabilized fiber laser is proposed to interrogate the sensing DFB fiber laser by the Beat Frequency principle. As a reasonable DFB fiber laser setup is realized, a narrow Beat Frequency line-width of 3.23 kHz and a high Beat Frequency stability of 0.036 MHz in 15 minutes are obtained in the laboratory test, corresponding to a minimum static strain resolution of 270 pe. This is the first time that a sub-0.5 ne level for static strain measurement using DFB fiber laser is demonstrated.

  • distributed feedback fiber laser for sub nanostrain resolution static strain measurement by use of swept Beat Frequency demodulation
    Fifth Asia Pacific Optical Sensors Conference, 2015
    Co-Authors: Wenzhu Huang, Wentao Zhang
    Abstract:

    Fiber laser has the advantages of ultra-narrow linewidth, low phase and intensity noise, which is beneficial for ultra-high-resolution strain sensing. This paper presents a novel demodulation technique for sub-nanostrain-resolution static strain measurement based on two distributed feedback fiber lasers (DFB FLs). A commercial PZT-tunable laser is used to interrogate the DFB FLs and get the periodic Frequency-difference characteristics (two linear chrip signals) by swept Beat-Frequency principle. Two polarization controllers are used for adjusting the polarization direction of DFB FLs. And one of the two DFB FLs is used for temperature compensation and eliminating the Frequency shift influence of the commercial laser. Static strain is demodulated by calculating the difference of the direct current (DC) components of the two swept Beat-Frequency signals. A static-strain resolution of 0.88 ne is obtained in the laboratory test.

Frank K Tittel - One of the best experts on this subject based on the ideXlab platform.

  • Beat Frequency quartz enhanced photoacoustic spectroscopy for fast and calibration free continuous trace gas monitoring
    Nature Communications, 2017
    Co-Authors: Lei Dong, Huadan Zheng, Lei Zhang, Wangbao Yin, Liantuan Xiao, Suotang Jia, Frank K Tittel
    Abstract:

    Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a sensitive gas detection technique which requires frequent calibration and has a long response time. Here we report Beat Frequency (BF) QEPAS that can be used for ultra-sensitive calibration-free trace-gas detection and fast spectral scan applications. The resonance Frequency and Q-factor of the quartz tuning fork (QTF) as well as the trace-gas concentration can be obtained simultaneously by detecting the Beat Frequency signal generated when the transient response signal of the QTF is demodulated at its non-resonance Frequency. Hence, BF-QEPAS avoids a calibration process and permits continuous monitoring of a targeted trace gas. Three semiconductor lasers were selected as the excitation source to verify the performance of the BF-QEPAS technique. The BF-QEPAS method is capable of measuring lower trace-gas concentration levels with shorter averaging times as compared to conventional PAS and QEPAS techniques and determines the electrical QTF parameters precisely. Quartz-enhanced photoacoustic spectroscopy is a sensitive gas detection method whereby radiation-induced sound waves from gas absorption are detected. Here, Wuet al. use the Beat Frequency between a modulated laser and a tuning fork resonance to increase sensitivity and avoid frequent calibrations.

  • Beat Frequency quartz enhanced photoacoustic spectroscopy for fast and calibration free continuous trace gas monitoring
    Nature Communications, 2017
    Co-Authors: Lei Dong, Huadan Zheng, Lei Zhang, Wangbao Yin, Liantuan Xiao, Suotang Jia, Frank K Tittel
    Abstract:

    Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a sensitive gas detection technique which requires frequent calibration and has a long response time. Here we report Beat Frequency (BF) QEPAS that can be used for ultra-sensitive calibration-free trace-gas detection and fast spectral scan applications. The resonance Frequency and Q-factor of the quartz tuning fork (QTF) as well as the trace-gas concentration can be obtained simultaneously by detecting the Beat Frequency signal generated when the transient response signal of the QTF is demodulated at its non-resonance Frequency. Hence, BF-QEPAS avoids a calibration process and permits continuous monitoring of a targeted trace gas. Three semiconductor lasers were selected as the excitation source to verify the performance of the BF-QEPAS technique. The BF-QEPAS method is capable of measuring lower trace-gas concentration levels with shorter averaging times as compared to conventional PAS and QEPAS techniques and determines the electrical QTF parameters precisely.

Huadan Zheng - One of the best experts on this subject based on the ideXlab platform.

  • Beat Frequency quartz enhanced photoacoustic spectroscopy for fast and calibration free continuous trace gas monitoring
    Nature Communications, 2017
    Co-Authors: Lei Dong, Huadan Zheng, Lei Zhang, Wangbao Yin, Liantuan Xiao, Suotang Jia, Frank K Tittel
    Abstract:

    Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a sensitive gas detection technique which requires frequent calibration and has a long response time. Here we report Beat Frequency (BF) QEPAS that can be used for ultra-sensitive calibration-free trace-gas detection and fast spectral scan applications. The resonance Frequency and Q-factor of the quartz tuning fork (QTF) as well as the trace-gas concentration can be obtained simultaneously by detecting the Beat Frequency signal generated when the transient response signal of the QTF is demodulated at its non-resonance Frequency. Hence, BF-QEPAS avoids a calibration process and permits continuous monitoring of a targeted trace gas. Three semiconductor lasers were selected as the excitation source to verify the performance of the BF-QEPAS technique. The BF-QEPAS method is capable of measuring lower trace-gas concentration levels with shorter averaging times as compared to conventional PAS and QEPAS techniques and determines the electrical QTF parameters precisely. Quartz-enhanced photoacoustic spectroscopy is a sensitive gas detection method whereby radiation-induced sound waves from gas absorption are detected. Here, Wuet al. use the Beat Frequency between a modulated laser and a tuning fork resonance to increase sensitivity and avoid frequent calibrations.

  • Beat Frequency quartz enhanced photoacoustic spectroscopy for fast and calibration free continuous trace gas monitoring
    Nature Communications, 2017
    Co-Authors: Lei Dong, Huadan Zheng, Lei Zhang, Wangbao Yin, Liantuan Xiao, Suotang Jia, Frank K Tittel
    Abstract:

    Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a sensitive gas detection technique which requires frequent calibration and has a long response time. Here we report Beat Frequency (BF) QEPAS that can be used for ultra-sensitive calibration-free trace-gas detection and fast spectral scan applications. The resonance Frequency and Q-factor of the quartz tuning fork (QTF) as well as the trace-gas concentration can be obtained simultaneously by detecting the Beat Frequency signal generated when the transient response signal of the QTF is demodulated at its non-resonance Frequency. Hence, BF-QEPAS avoids a calibration process and permits continuous monitoring of a targeted trace gas. Three semiconductor lasers were selected as the excitation source to verify the performance of the BF-QEPAS technique. The BF-QEPAS method is capable of measuring lower trace-gas concentration levels with shorter averaging times as compared to conventional PAS and QEPAS techniques and determines the electrical QTF parameters precisely.

Wenzhu Huang - One of the best experts on this subject based on the ideXlab platform.

  • high resolution static strain sensor based on random fiber laser and Beat Frequency interrogation
    IEEE Photonics Technology Letters, 2019
    Co-Authors: Shuaijie Miao, Wenzhu Huang, Wentao Zhang, Ying Song
    Abstract:

    We proposed a high-resolution static strain sensor using random fiber lasers (RFLs) and the sweep-Beat Frequency interrogation technique. An RFL with 3-dB linewidth of 548 Hz and Frequency jitter of ~±70 kHz is established by random distributed gratings and a high-precision π-phase shifted fiber Bragg grating (π-FBG) ring mirror. Two RFLs act as probes and are interrogated by Frequency-swept laser. One RFL is used for strain sensing, the other is used for compensating temperature and Frequency shift of swept laser. By using sweep-Beat Frequency demodulation, a static strain resolution of 196 pico-strain (pe) is obtained in 160 s. To the best of our knowledge, this is the first time that RFLs have been used in static strain sensing based on sweep Beat-Frequency interrogation.

  • dfb fiber laser for high resolution acoustic emission detection based on Beat Frequency interrogation
    2018 Asia Communications and Photonics Conference (ACP), 2018
    Co-Authors: Qing Jia, Wenzhu Huang, Wentao Zhang
    Abstract:

    This paper proposes a compact acoustic emission (AE) detection technique based on distributed feedback fiber laser (DFB-FL) using Beat Frequency interrogation. Because of the ultra-narrow linewidth of Beat Frequency and time-Frequency analysis method, the detection system can reach a high strain resolution of 6.4×10−9 with 1 MHz demodulation speed and 400 MHz dynamic range.

  • dfb fiber laser static strain sensor based on Beat Frequency interrogation with a reference fiber laser locked to a fbg resonator
    Optics Express, 2016
    Co-Authors: Wenzhu Huang, Shengwen Feng, Wentao Zhang
    Abstract:

    We report on a high-resolution static strain sensor developed with distributed feedback (DFB) fiber laser. A reference FBG resonator is used for temperature compensation. Locking another independent fiber laser to the resonator using the Pound-Drever-Hall technique results in a strain power spectral density better than Se(f) = (4.6 × 10−21) e2/Hz in the Frequency range from 1 Hz to 1 kHz, corresponding to a minimum dynamic strain resolution of 67.8 pe/√Hz. This Frequency stabilized fiber laser is proposed to interrogate the sensing DFB fiber laser by the Beat Frequency principle. As a reasonable DFB fiber laser setup is realized, a narrow Beat Frequency line-width of 3.23 kHz and a high Beat Frequency stability of 0.036 MHz in 15 minutes are obtained in the laboratory test, corresponding to a minimum static strain resolution of 270 pe. This is the first time that a sub-0.5 ne level for static strain measurement using DFB fiber laser is demonstrated.

  • distributed feedback fiber laser for sub nanostrain resolution static strain measurement by use of swept Beat Frequency demodulation
    Fifth Asia Pacific Optical Sensors Conference, 2015
    Co-Authors: Wenzhu Huang, Wentao Zhang
    Abstract:

    Fiber laser has the advantages of ultra-narrow linewidth, low phase and intensity noise, which is beneficial for ultra-high-resolution strain sensing. This paper presents a novel demodulation technique for sub-nanostrain-resolution static strain measurement based on two distributed feedback fiber lasers (DFB FLs). A commercial PZT-tunable laser is used to interrogate the DFB FLs and get the periodic Frequency-difference characteristics (two linear chrip signals) by swept Beat-Frequency principle. Two polarization controllers are used for adjusting the polarization direction of DFB FLs. And one of the two DFB FLs is used for temperature compensation and eliminating the Frequency shift influence of the commercial laser. Static strain is demodulated by calculating the difference of the direct current (DC) components of the two swept Beat-Frequency signals. A static-strain resolution of 0.88 ne is obtained in the laboratory test.

Lei Dong - One of the best experts on this subject based on the ideXlab platform.

  • Beat Frequency quartz enhanced photoacoustic spectroscopy for fast and calibration free continuous trace gas monitoring
    Nature Communications, 2017
    Co-Authors: Lei Dong, Huadan Zheng, Lei Zhang, Wangbao Yin, Liantuan Xiao, Suotang Jia, Frank K Tittel
    Abstract:

    Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a sensitive gas detection technique which requires frequent calibration and has a long response time. Here we report Beat Frequency (BF) QEPAS that can be used for ultra-sensitive calibration-free trace-gas detection and fast spectral scan applications. The resonance Frequency and Q-factor of the quartz tuning fork (QTF) as well as the trace-gas concentration can be obtained simultaneously by detecting the Beat Frequency signal generated when the transient response signal of the QTF is demodulated at its non-resonance Frequency. Hence, BF-QEPAS avoids a calibration process and permits continuous monitoring of a targeted trace gas. Three semiconductor lasers were selected as the excitation source to verify the performance of the BF-QEPAS technique. The BF-QEPAS method is capable of measuring lower trace-gas concentration levels with shorter averaging times as compared to conventional PAS and QEPAS techniques and determines the electrical QTF parameters precisely. Quartz-enhanced photoacoustic spectroscopy is a sensitive gas detection method whereby radiation-induced sound waves from gas absorption are detected. Here, Wuet al. use the Beat Frequency between a modulated laser and a tuning fork resonance to increase sensitivity and avoid frequent calibrations.

  • Beat Frequency quartz enhanced photoacoustic spectroscopy for fast and calibration free continuous trace gas monitoring
    Nature Communications, 2017
    Co-Authors: Lei Dong, Huadan Zheng, Lei Zhang, Wangbao Yin, Liantuan Xiao, Suotang Jia, Frank K Tittel
    Abstract:

    Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a sensitive gas detection technique which requires frequent calibration and has a long response time. Here we report Beat Frequency (BF) QEPAS that can be used for ultra-sensitive calibration-free trace-gas detection and fast spectral scan applications. The resonance Frequency and Q-factor of the quartz tuning fork (QTF) as well as the trace-gas concentration can be obtained simultaneously by detecting the Beat Frequency signal generated when the transient response signal of the QTF is demodulated at its non-resonance Frequency. Hence, BF-QEPAS avoids a calibration process and permits continuous monitoring of a targeted trace gas. Three semiconductor lasers were selected as the excitation source to verify the performance of the BF-QEPAS technique. The BF-QEPAS method is capable of measuring lower trace-gas concentration levels with shorter averaging times as compared to conventional PAS and QEPAS techniques and determines the electrical QTF parameters precisely.