Strain Measurement by Fiber-Loop Ring-Down Spectroscopy and Fiber Mode Converter

Qiu, Huiye; Qiu, Yishen; Chen, Zhihao; Fu, Baoyu; Li, Gaoming

doi:10.1109/jsen.2008.926884

Cited by 28 publications

(15 citation statements)

References 8 publications

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“…Therefore, a monitoring method that can overcome the complex structure of traditional fiber sensors contributes to actual field applications. Fiber loop ring-down spectroscopy (FLRDS) technology has the advantages of simple structure and good reliability, which has broad prospects in pressure measurement [ 35 , 36 , 37 ]. Wang et al [ 38 ] first applied FLRDS technology to pressure sensing.…”

Section: Introductionmentioning

confidence: 99%

Static Ice Pressure Measuring System Based on Fiber Loop Ring-Down Spectroscopy and FPGA

Deng

Wang

Pan

et al. 2020

Sensors

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Hydraulic engineering built in the cold region, such as reservoirs and hydropower stations, is often threatened by static ice pressure from nature. Therefore, it is of vital significance to research the pressure variation in the growth and melting processes of the ice layer for the design and protection of hydraulic structures in cold regions. This paper introduces an optical fiber sensor system based on the fiber loop ring-down spectroscopy technology and field-programmable gate array (FPGA) pulse modulation technology. An electro-optic modulation scheme that relied on FPGA to generate optical pulses with adjustable pulse width and period is proposed, which is more suitable for the in-situ observation. In addition, the temperature stability and repeatability of the system are also discussed. This system was applied to the real-time detection of static ice pressure on the sidewall and bottom of the polyvinyl chloride (PVC) pipe during the ice growth and melting processes. The results indicate that the system has favorable stability and sensitivity, and the relationship obtained between the static ice pressure and temperature could provide some references for the field application in the future.

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Section: Introductionmentioning

confidence: 99%

Static Ice Pressure Measuring System Based on Fiber Loop Ring-Down Spectroscopy and FPGA

Deng

Wang

Pan

et al. 2020

Sensors

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“…In the 21st century, fiber cavity ring-down (FCRD) techniques [8], [9] that not only had the same advantages as CRD, but also offered its own strong points were proposed by Stewart et al The FCRD technique, wherein a fiber loop replaces the high-reflectivity mirror resonant cavity, has been implemented in pressure [10], [11], refractive index sensor [9], [12], chemical synthesis [13], [14], and gas sensing [8], [15]. Numerous optical modulation techniques have been proposed to enhance the optical fiber sensor sensitivities of CRD schemes [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Continuous-Wave Frequency-Shifted Interferometry Cavity Ring-Down Gas Sensing With Differential Optical Absorption

et al. 2015

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This paper proposes a novel frequency-shifted interferometry (FSI) fiber cavity ring-down (CRD) gas sensing with dual-wavelength differential optical absorption that requires no modulation to a continuous-wave source or without fast detection and switching electronics. The fiber cavity is constructed from standard fiber optical components that include a micro-optical gas cell. FSI-CRD experiments are carried out with two wavelengths at 1531.770 and 1532.000 nm. The technique is successfully carried out by measuring acetylene-nitrogen mixtures with acetylene concentrations varying from 0% to 1.0%. A resolution of 7.8125%/dB is obtained. A minimum detectable acetylene concentration of 105.25 ppm was achieved with a 48-mm gas cell. The results show a good linear relationship between acetylene concentration and absorption loss and are in good agreement with existing theories. Dual-wavelength differential optical absorption can enhance measurement precision efficiently and eliminate the influence of various external factors. The relative deviation of measured concentration is less than AE0.29%, measured at 1.0% acetylene concentration over 70 min.

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“…The FLRD technique was first demonstrated by Stewart et al [36]. Later many different variants of FLRD have been reported by different research groups for different applications [37–43], including pressure, force, and strain sensors using a fiber loop combined with different types of fibers or optical components, such as FBG and long period grating [44–48]. However, to date the FLRD technique has not been explored for crack detection in concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Fiber Loop Ringdown Sensor for Potential Real-Time Monitoring of Cracks in Concrete Structures: An Exploratory Study

Sahay

Kaya

Wang

2012

Sensors

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A fiber loop ringdown (FLRD) concrete crack sensor is described for the first time. A bare single mode fiber (SMF), without using other optical components or chemical coatings, etc., was utilized to construct the sensor head, which was driven by a FLRD sensor system. The performance of the sensor was evaluated on concrete bars with dimensions 20 cm × 5 cm × 5 cm, made in our laboratory. Cracks were produced manually and the responses of the sensor were recorded in terms of ringdown times. The sensor demonstrated detection of the surface crack width (SCW) of 0.5 mm, which leads to a theoretical SCW detection limit of 31 μm. The sensor's response to a cracking event is near real-time (1.5 s). A large dynamic range of crack detection ranging from a few microns (μm) to a few millimeters is expected from this sensor. With the distinct features, such as simplicity, temperature independence, near real-time response, high SCW detection sensitivity, and a large dynamic range, this FLRD crack sensor appears promising for detections of cracks when embedded in concrete.

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Strain Measurement by Fiber-Loop Ring-Down Spectroscopy and Fiber Mode Converter

Cited by 28 publications

References 8 publications

Static Ice Pressure Measuring System Based on Fiber Loop Ring-Down Spectroscopy and FPGA

Static Ice Pressure Measuring System Based on Fiber Loop Ring-Down Spectroscopy and FPGA

Continuous-Wave Frequency-Shifted Interferometry Cavity Ring-Down Gas Sensing With Differential Optical Absorption

Fiber Loop Ringdown Sensor for Potential Real-Time Monitoring of Cracks in Concrete Structures: An Exploratory Study

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