TY - JOUR
T1 - Liquid level sensor based on an excessively tilted fibre grating
AU - Mou, Chengbo
AU - Zhou, Kaiming
AU - Yan, Zhijun
AU - Fu, Hongyan
AU - Zhang, Lin
PY - 2013/9/15
Y1 - 2013/9/15
N2 - We propose and demonstrate an optical liquid level sensor based on the surrounding medium refractive index (SRI) sensing using an excessively tilted fibre grating (ETFG). When the ETFG submerged in water, two sets of cladding modes are coupled, corresponding to air- and water-surrounded grating structures, respectively. The coupling strengths of the two sets of cladding modes evolve with the submerging length of the grating, providing a mechanism to measure the liquid level. Comparing with long-period fibre grating based liquid level sensor, the ETFG sensor has a much higher SRI responsivity for liquids with refractive index around 1.33 and a lower thermal cross sensitivity.
AB - We propose and demonstrate an optical liquid level sensor based on the surrounding medium refractive index (SRI) sensing using an excessively tilted fibre grating (ETFG). When the ETFG submerged in water, two sets of cladding modes are coupled, corresponding to air- and water-surrounded grating structures, respectively. The coupling strengths of the two sets of cladding modes evolve with the submerging length of the grating, providing a mechanism to measure the liquid level. Comparing with long-period fibre grating based liquid level sensor, the ETFG sensor has a much higher SRI responsivity for liquids with refractive index around 1.33 and a lower thermal cross sensitivity.
KW - fibre bragg grating
KW - tilted fibre grating
KW - fibre sensor
KW - level sensor
UR - http://www.scopus.com/inward/record.url?scp=84879050256&partnerID=8YFLogxK
U2 - 10.1016/j.optcom.2013.05.019
DO - 10.1016/j.optcom.2013.05.019
M3 - Article
AN - SCOPUS:84879050256
SN - 0030-4018
VL - 305
SP - 271
EP - 275
JO - Optics Communications
JF - Optics Communications
ER -