title: Liquid-level sensor with a high-birefringence-fiber loop mirror.
abstract: A novel liquid-level sensor with a high-birefringence-fiber loop mirror (HBFLM) based on a uniform-strength cantilever beam (UCB) is proposed and demonstrated. Part of the high-birefringence fiber is pasted onto the central surface of the UCB. A hollow suspending pole is utilized to apply force at the end of the beam. The applied force varies with the change of the liquid level, leading to a change of transmission intensity. Thus the variation of liquid level can be determined via the laser wavelength within the quasi-linear transmission range of the HBFLM filter. Its sensitivity, resolution, and linear measurement range reach 0.047/cm, 10 mm, and 140 mm, respectively. The advantages of the sensor include simple structure, high sensitivity, low cost, and good repeatability, etc. The sensing signal can be directly detected by a photodetector and does not require complicated demodulation devices.
authors.affiliation: Institute of Modern Optics, Nankai University, Tianjin, China. dbo1978@163.com
authors.forename: Dong
authors.initials: D
authors.lastname: Bo
authors.forename: Zhao
authors.initials: Z
authors.lastname: Qida
authors.forename: Lvjun
authors.initials: L
authors.lastname: Feng
authors.forename: Guo
authors.initials: G
authors.lastname: Tuan
authors.forename: Xue
authors.initials: X
authors.lastname: Lifang
authors.forename: Li
authors.initials: L
authors.lastname: Shuhong
authors.forename: Gu
authors.initials: G
authors.lastname: Hong