A Wide-Range Displacement Sensor Based on Plastic Fiber Macro-Bend Coupling

Liu, Jia; Hou, Yuguang; Zhang, Huixin; Jia, Pinggang; Su, Shan; Fang, Guocheng; Liu, Wenyi; Xiong, Jijun

doi:10.3390/s17010196

Cited by 17 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Detecting such small local displacements can assist in effectively preventing large-scale collapse accidents. For this reason, various techniques have been studied to measure the displacement of structures, such as using sensors inside structures, e.g., displacement gauges and clinometers [ 7 , 8 , 9 , 10 , 11 , 12 ], for short-period displacements, and using laser scanners [ 13 , 14 , 15 , 16 ], total stations [ 17 ], the Global Navigation Satellite System (GNSS) [ 17 , 18 , 19 ], and images [ 15 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ] for long-period displacements.…”

Section: Introductionmentioning

confidence: 99%

Marker-Based Structural Displacement Measurement Models with Camera Movement Error Correction Using Image Matching and Anomaly Detection

Kim

Jeong

Lee³

et al. 2020

Sensors

View full text Add to dashboard Cite

To prevent collapse accidents at construction sites, the marker-based displacement measurement method was developed. However, it has difficulty in obtaining accurate measurements at long distances (>50 m) in an outdoor environment because of camera movements. To overcome this problem, marker-based structural displacement measurement models using image matching and anomaly detection were designed in this study. Then, the performance of each model in terms of camera movement error correction was verified through comparison with that of a conventional model. The results show that the systematic errors due to camera movements (<1.7°) were corrected. The detection rate of markers with displacement reached 95%, and the probability that the error size would be less than 10 mm was ≥ 95% with a 95% confidence interval at a distance of more than 100 m. Moreover, the normalized mean square error was less than 0.1. The models developed in this study can measure the pure displacement of an object without the systematic errors caused by camera movements. Furthermore, these models can be used to measure the displacements of distant structures using closed-circuit television cameras and markers in an outdoor environment with high accuracy.

show abstract

Section: Introductionmentioning

confidence: 99%

Marker-Based Structural Displacement Measurement Models with Camera Movement Error Correction Using Image Matching and Anomaly Detection

Kim

Jeong

Lee³

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…However, this type of sensor is complex in its fabrication. On the other hand, intensity modulated sensor has low fabrication complexity due to its simplest configuration, but has drawback in its sensitivity performance and can be easily influenced by intensity fluctuation of the laser source [11]- [13]. As for Mach-Zhender, Sagnac and Fabry-Perot interferometric sensors, the sensors have comparable sensitivity to wavelength modulated sensor with easier fabrication process and more stable compared to intensity modulated sensor [14]- [19].…”

Section: Introductionmentioning

confidence: 99%

Optical Temperature Sensor based on Sagnac Interferometer

Omar¹,

Cholan²,

Mohd³

et al. 2018

IJET

View full text Add to dashboard Cite

Optical temperature sensors gain interest from the community recently due to their immunity to electromagnetic interference and ruggedness against chemical and mechanical disturbances as opposed to the conventional temperature sensors such as thermocouples and resistance temperature detectors. Optical temperature sensors come with many varieties and Sagnac interferometer is one of them. In this work, an all-fiber temperature sensor is proposed and experimentally demonstrated. The proposed optical temperature utilizes Sagnac interferometer as the temperature head. The underlying mechanism for this sensor is based on the temperature dependence of a polarization maintaining fiber (PMF) in the Sagnac interferometer. The PMF birefringence which is influenced by temperature affects the phase difference of two incoming lights that enter the Sagnac interferometer and this contributes to the shifting of the transmission spectrum. The input light for the sensor characterization is provided by a custom-made amplified spontaneous emission source which comprises of a tunable laser source, a 980 nm laser diode pump, a wavelength division multiplexing coupler and a 10 m long erbium-doped fiber. Experimental results indicate that the temperature does affect the PMF characteristic. As the temperature increases from 30°C to 45°C, the wavelength dip reduced from 1553.8 nm to 1536.78nm. This proposed optical temperature sensor has a sensitivity of-1.0345 nm/°C. The development of this optical temperature sensor is promising especially for the measurement in the harsh environment.

show abstract

“…For example, a reference POF is adopted in a refractive index sensor to remove the source power variation [ 18 ]. The dark field characteristics of a twisted macro-bend coupling structure (TMBCS) are used to improve the signal to noise ratio, which realizes the liquid level detection in [ 19 ] and displacement sensing in [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

A Cost-Effective Relative Humidity Sensor Based on Side Coupling Induction Technology

Zhang

Hou

Liu

et al. 2017

Sensors

Self Cite

View full text Add to dashboard Cite

A intensity-modulated optical fiber relative humidity (RH) sensor based on the side coupling induction technology (SCIT) is presented and experimentally demonstrated. The agarose gel and the twisted macro-bend coupling structure are first combined for RH sensing applications. The refractive index (RI) of the agarose gel increases with the increase of the RH and is in linear proportion from 20 to 80%RH. The side coupling power, which changes directly with the RI of the agarose gel, can strip the source noise from the sensor signal and improve the signal to noise ratio substantially. The experiment results show that the sensitivity of the proposed sensor increases while the bend radius decreases. When the bend radius is 8 mm, the sensor has a linear response from 40% to 80% RH with the sensitivity of 4.23 nW/% and the limit of detection of 0.70%. A higher sensitivity of 12.49 nW/% is achieved when RH raises from 80% to 90% and the limit of detection decreases to 0.55%. Furthermore, the proposed sensor is a low-cost solution, offering advantages of good reversibility, fast response time, and compensable temperature dependence.

show abstract

A Wide-Range Displacement Sensor Based on Plastic Fiber Macro-Bend Coupling

Cited by 17 publications

References 16 publications

Marker-Based Structural Displacement Measurement Models with Camera Movement Error Correction Using Image Matching and Anomaly Detection

Marker-Based Structural Displacement Measurement Models with Camera Movement Error Correction Using Image Matching and Anomaly Detection

Optical Temperature Sensor based on Sagnac Interferometer

A Cost-Effective Relative Humidity Sensor Based on Side Coupling Induction Technology

Contact Info

Product

Resources

About