TY - JOUR
T1 - Reliability-guided Rayleigh backscattering spectrum correlation method for distributed strain measurements in optical fibres
AU - Suo, Liujia
AU - Lei, Zhenkun
AU - Takezawa, Akihiro
AU - Wu, Zhanjun
N1 - Funding Information:
The authors acknowledge the support of the National Natural Science Foundation of China (11772081, 11772075 and 11602048).
PY - 2019/3/12
Y1 - 2019/3/12
N2 - We present a method of reliability-guided Rayleigh backscattering correlation for distributed strain measurements in optical fibres. In this method, a reference Rayleigh-backscattering-spectrum (RBS) range that is larger than the measurement RBS range is defined to extend the matching range. To obtain the best match between reference and measurement spectra, the zero-mean normalized cross correlation (ZNCC) is employed to evaluate the degree of similarity. The path for searching the maximum similarity matching pattern is guided using Newton’s iteration method. The reliability of the computed RBS shift is identified by the ZNCC coefficient distribution. The experiments show that the proposed method has high reliability in computing the RBS shift. Even at a relatively large strain (e.g. 5000 µϵ), the proposed method can stably demodulate the strain within a relative error of −1% and a spatial resolution of 1.6 cm over a 22-meter-long single-mode fibre. This shows that the proposed method has an advantage in regard to relatively large strain measurements.
AB - We present a method of reliability-guided Rayleigh backscattering correlation for distributed strain measurements in optical fibres. In this method, a reference Rayleigh-backscattering-spectrum (RBS) range that is larger than the measurement RBS range is defined to extend the matching range. To obtain the best match between reference and measurement spectra, the zero-mean normalized cross correlation (ZNCC) is employed to evaluate the degree of similarity. The path for searching the maximum similarity matching pattern is guided using Newton’s iteration method. The reliability of the computed RBS shift is identified by the ZNCC coefficient distribution. The experiments show that the proposed method has high reliability in computing the RBS shift. Even at a relatively large strain (e.g. 5000 µϵ), the proposed method can stably demodulate the strain within a relative error of −1% and a spatial resolution of 1.6 cm over a 22-meter-long single-mode fibre. This shows that the proposed method has an advantage in regard to relatively large strain measurements.
KW - cross correlation
KW - Distributed strain measurement
KW - high reliability
KW - optical frequency domain reflectometry
KW - Rayleigh backscattering spectrum shift
UR - http://www.scopus.com/inward/record.url?scp=85060306931&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85060306931&partnerID=8YFLogxK
U2 - 10.1080/09500340.2018.1549288
DO - 10.1080/09500340.2018.1549288
M3 - Article
AN - SCOPUS:85060306931
VL - 66
SP - 512
EP - 520
JO - Journal of Modern Optics
JF - Journal of Modern Optics
SN - 0950-0340
IS - 5
ER -