Kim, Yong Hyun Lee, Kwanil Song, Kwang Yong 2024-01-20T05:30:45Z 2024-01-20T05:30:45Z 2021-09-03 2015-12-28 1094-4087 https://pubs.kist.re.kr/handle/201004/124608 Large increase of effective sensing points in Brillouin optical correlation domain analysis (BOCDA) is achieved by simultaneously applying double modulation and optical time gate based on differential measurement scheme. The noise substructure of Brillouin gain spectrum induced by the double modulation is effectively suppressed by the differential measurement, leading to 2,000 times enlargement of the measurement range. Distributed strain and temperature sensing along a 10.5 km fiber with spatial resolution of less than 1 cm is experimentally demonstrated which corresponds to over 1 million effective sensing points. (C) 2015 Optical Society of America English OPTICAL SOC AMER DISTRIBUTED STRAIN-MEASUREMENT ORDER SPATIAL-RESOLUTION MEASUREMENT SCHEME SENSOR MODULATION SCATTERING AMPLIFICATION PROPOSAL Brillouin optical correlation domain analysis with more than 1 million effective sensing points based on differential measurement Article 10.1364/OE.23.033241 1 OPTICS EXPRESS, v.23, no.26, pp.33241 - 33248 OPTICS EXPRESS 23 26 33241 33248 scie scopus 000368004600036 2-s2.0-84961801449 Optics Optics Article DISTRIBUTED STRAIN-MEASUREMENT ORDER SPATIAL-RESOLUTION MEASUREMENT SCHEME SENSOR MODULATION SCATTERING AMPLIFICATION PROPOSAL