Simultaneous measurement of gas composition and concentration combined fiber cavtiy ringdown and frequency-shifted interferometry

Yang, Zhangyong; Ou, Yiwen; Chen, Zehao; Chen, Jiaxuan; Lv, Hui

doi:10.1016/j.yofte.2019.01.032

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…Compared with the conventional FCRD method, this new scheme was more cost-effective because it utilizes a low-cost CW laser and slow detector without the need of expensive pulsed laser and fast electronics. Due to its excellent characteristics, such as low cost and high stability, the space-domain passive FCRD technique has attracted more and more interests and been widely used for many sensing applications, such as gas detection [22], pressure [23], magnetic field sensing [24] and so on.…”

Section: Conventional Fcrd Methods Belongs To Time-domain Sensing Technique Because It Usuallymentioning

confidence: 99%

Optical Sensor Using Space-Domain Active Fiber Cavity Ringdown Technique

Chen

Zhu

et al. 2021

Preprint

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A novel active fiber cavity ringdown (FCRD) technique using frequency-shifted interferometry (FSI) is proposed for the first time. Using this scheme, external parameters can be monitored in the space domain by measuring the ringdown distance instead of ringdown time. A bidirectional erbium-doped fiber amplifier (Bi-EDFA) is employed to compensate the inherent cavity loss for achieving higher sensitivity. And two band-pass filters are used to reduce the amplified spontaneous emission (ASE) noise of the Bi-EDFA. Compared with the well-known time-domain active FCRD scheme, our proposed method enables us to avoid using pulsed laser needed in time-domain active FCRD, it uses continuous-wave laser to inject into the fiber cavity and stabilize the optical power in the fiber cavity, which can suppress gain fluctuations of the EDFA and thus improve the detecting precision. Moreover, this novel method enables us to use differential detection method for further reducing the ASE noise, and thus eliminating the baseline drift of ringdown signal. A magnetic field sensor was developed as a proof-of-concept demonstration. The experimental results demonstrate that the proposed sensor with a sensitivity of 0.01537 (1/km·Gs) was achieved. This is the highest magnetic field sensitivity compared to the time-domain active FLRD method. Due to the reduced ASE noise, the stability of the proposed sensing system was also greatly improved.

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Section: Conventional Fcrd Methods Belongs To Time-domain Sensing Technique Because It Usuallymentioning

confidence: 99%

Optical Sensor Using Space-Domain Active Fiber Cavity Ringdown Technique

Chen

Zhu

et al. 2021

Preprint

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“…The frequency shift is usually introduced by an acousto-optic modulator (AOM), while a balanced detector is used to subtract the two interference signals to remove noise and effects of outside disturbances. The resultant FFT signal is converted to distance, which provides the CRD signals in the spatial domain. ,, This circumvents the need for fast detectors and fast data acquisition systems, making the system cost-effective.…”

Section: Optical Cavity-based Advanced Techniquesmentioning

confidence: 99%

“…Cheng and co-workers in their study employed the FSI-CRDS in fiber loop for pressure sensing by applying weights on the fiber-based sensor. They also demonstrated spectral determination and detection of acetylene gas in the region 1525–1540 nm with a minimum detection sensitivity of ∼263 ppm, by using a gas cell within the fiber loop. Figure depicts FSI-CRDS using a fiber loop .…”

Section: Optical Cavity-based Advanced Techniquesmentioning

confidence: 99%

Cavity Ring-Down Spectroscopy: Recent Technological Advancements, Techniques, and Applications

2020

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“…(6) In recent years, the continuous development of communication technology has contributed to sensing technology using optical fibers. (7,8) Accordingly, fiber-optic sensors, e.g., functional fiber and non-functional fiber sensors, have been rapidly developed as they have advantages such as a small size, high sensitivity, strong anti-interference ability, and so forth. The sensors are widely applied in many fields including pharmaceutical manufacturing, shipping, and civil engineering.…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg Grating Inclinometer-enabled IoT Sensing System with Low Power Consumption and Small Size

Cui¹,

Le²,

Dai³

2021

Sensors and Materials

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The application of fiber Bragg grating (FBG) sensors in the Internet of Things (IoT) has attracted wide attention for promising scenarios, such as remote monitoring of the subsidence of transformer substations, intelligent sensing of the power grid, and monitoring the safety of mines. However, disaster prewarning and forecasting in infrastructure construction require the key technology of remote sensing and monitoring. To resolve the current problems existing in monitoring the subsidence of substations built on a slope, an inclinometer based on FBG sensor technology is developed in this study. The FBG inclinometer sensor includes a rigid unit, a flexible sensing unit, and a connecting pin shaft. The flexible sensing unit is equipped with an FBG beam structure with uniform strength. The designed FBG is arranged symmetrically on the surface of the beam structure to eliminate the influence of temperature on measurement. In addition, a system that uses the FBG inclinometer sensor for remotely monitoring the subsidence of a transformer substation is designed. This system can display the subsidence of the substation on-site or at a remote terminal in real time. Indoor and field tests are carried out on the remote monitoring system. The test results show that the minimum resolution of the system is 0.1 mm and the maximum measurement error is less than 3%, which meet the requirements of on-site use.

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Simultaneous measurement of gas composition and concentration combined fiber cavtiy ringdown and frequency-shifted interferometry

Cited by 14 publications

References 18 publications

Optical Sensor Using Space-Domain Active Fiber Cavity Ringdown Technique

Optical Sensor Using Space-Domain Active Fiber Cavity Ringdown Technique

Cavity Ring-Down Spectroscopy: Recent Technological Advancements, Techniques, and Applications

Fiber Bragg Grating Inclinometer-enabled IoT Sensing System with Low Power Consumption and Small Size

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