Study of a Long-Gauge FBG Strain Sensor with Enhanced Sensitivity and Its Application in Structural Monitoring

Yang, Jing; Yang, Caiqian; Yang, Ning

doi:10.3390/s21103492

Cited by 21 publications

(9 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The second type is a fiber Bragg grating strain sensor, which is mainly used for structural health monitoring in the engineering field [ 8 ]. For example, fiber grating combined with the lever principle to achieve micro-strain measurement [ 9 ], a long-gauge fiber Bragg grating (FBG) strain sensor with enhanced strain sensitivity [ 10 ], or a silver-coated, 45-degree-radiated tilted fiber used for strain sensing [ 11 ], using three-dimensional (3D) printing technology to embed the FBG into a thermoplastic polyurethane filament can be effective in strain measurement [ 12 ], etc. The third type is the optical fiber surface plasmon resonance (SPR) strain sensor [ 13 , 14 , 15 , 16 ], which mainly makes the transmission light with total reflection at the fiber core and cladding interface contact with the metal film.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Compensated Multi-Point Strain Sensing Based on Cascaded FBG and Optical FMCW Interferometry

Feng

Cheng

Chen

et al. 2022

Sensors

View full text Add to dashboard Cite

We proposed a novel temperature-compensated multi-point strain sensing system based on cascaded FBG and optical FMCW interferometry. The former is used for simultaneous sensing of temperature and strain, and the latter is used for position information reading and multiplexing. In the experiment, a narrow linewidth laser with continuous frequency-sweeping was used as the light source. After demodulating the beat-frequency signal, the link information of the 16 m fiber was obtained, and the measured result was identical to the actual position. The measurement accuracy reached 50.15 mm, and the dynamic range was up to 22.68 dB. Meanwhile, we completed the sensing experiments for temperature range from 20 °C to 90 °C and strain range from 0 με to 7000 με. The sensitivity of the sensing system to temperature was 10.21 pm/°C, the sensitivity and accuracy to strain were as high as 1.163 pm/με and 10 με, respectively. Finally, the measured strain and temperature values were obtained using the sensing matrix. The sensing system has important practical significance in the field of quasi-distributed strain measurement.

show abstract

Section: Introductionmentioning

confidence: 99%

Temperature-Compensated Multi-Point Strain Sensing Based on Cascaded FBG and Optical FMCW Interferometry

Feng

Cheng

Chen

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…In recent years, FBG sensors have been used in civil engineering as an effective means for monitoring the health of buildings. The FBG sensor uses an optical signal as the carrier of conversion and transmission and is characterized by a small size, light weight, high sensitivity, corrosion resistance, and strong anti-electromagnetic interference [18][19][20]. Particularly in humid environments, the FBG sensor has high test accuracy, good long-term stability, and no zero-shift, thus making it particularly suitable to the long-term safety monitoring of coal-mine shaft lining structures.…”

Section: Introductionmentioning

confidence: 99%

Application of FBG Sensor to Safety Monitoring of Mine Shaft Lining Structure

Yao

et al. 2022

Sensors

View full text Add to dashboard Cite

The use of fiber Bragg grating (FBG) sensors is proposed to solve the technical problem of poor sensor stability in the long-term safety monitoring of shaft lining structures. The auxiliary shaft of the Zhuxianzhuang coal mine was considered as the engineering background, and a test system implementing FBG sensors was established to monitor the long-term safety of the shaft lining structure. Indoor simulation testing revealed that the coefficient of determination (r2) between the test curves of the FBG sensor and the resistance strain gauge is greater than 0.99 in both the transverse and vertical strains. Therefore, the FBG sensor and resistance strain gauge test values are similar, and the error is small. The early warning value was obtained by calculation, according to the specific engineering geological conditions and shaft lining structure. The monitoring data obtained for the shaft lining at three test levels over more than three years reveal that the measured vertical strain value is less than the warning value, indicating that the shaft lining structure is currently in a safe state. The analysis of the monitoring data reveals that the vertical strain increment caused by the vertical additional force is approximately 0.0752 με/d. As the mine drainage progresses, the increasing vertical additional force acting on the shaft lining will compromise the safety of the shaft lining structure. Therefore, the monitoring must be enhanced to facilitate decision-making for safe shaft operation.

show abstract

“…(5) Owing to the wavelength modulation, changes in the light source intensity, link loss, and the electrical signal intensity of an optical fiber sensing system will not influence the measurement results. Therefore, FBG sensors are widely used to monitor physical parameters such as temperature, (6,7) strain, (8) and displacement in the aerospace, civil engineering, petroleum, and petrochemical fields. (9)(10)(11) Accurate wavelength demodulation is the key to FBG sensing systems.…”

Section: Introductionmentioning

confidence: 99%

Demodulation Algorithm for Fiber Bragg Grating Sensors

Jianxin¹,

Yang²,

Wang³

et al. 2022

Sensors and Materials

View full text Add to dashboard Cite

A demodulation algorithm is vital for a fiber Bragg grating (FBG) sensing system. In this paper, a novel demodulation algorithm based on the variable-step-size method and crosscorrelation algorithm is proposed to demodulate the wavelength of an FBG. By changing the step size of each calculation, the amount of calculation can be greatly reduced, and pm-level resolution can be achieved over the whole bandwidth. A simulation shows that the demodulation results are not affected by noise, and the algorithm can accurately demodulate the FBG wavelength in a large range. The stability of the algorithm is also tested using three FBG sensors, and the results show that the difference among 25 measurements is only 4 pm. Moreover, the results of temperature calibration experiments show that the sensitivity of the sensor is 41.9 pm/℃, which is similar to the value of 45 pm/℃ provided by the manufacturer. The R 2 value of the fitting curve is 0.9994, which means that the demodulation algorithm can be effectively used in sensing measurement.

show abstract

Study of a Long-Gauge FBG Strain Sensor with Enhanced Sensitivity and Its Application in Structural Monitoring

Cited by 21 publications

References 23 publications

Temperature-Compensated Multi-Point Strain Sensing Based on Cascaded FBG and Optical FMCW Interferometry

Temperature-Compensated Multi-Point Strain Sensing Based on Cascaded FBG and Optical FMCW Interferometry

Application of FBG Sensor to Safety Monitoring of Mine Shaft Lining Structure

Demodulation Algorithm for Fiber Bragg Grating Sensors

Contact Info

Product

Resources

About