[1] YANG J T, LEI X Q, KOU H N. New type of oil well liquid level measurement system[J]. Journal of Instrumentation, 2007, 28(4): 682-686(in Chinese).
[2] ZHANG D F, YANG Zh B. Oil quantity monitoring system based on capacitive liquid level sensor[J]. Bus Technology and Research, 2020, 42(5): 29-31(in Chinese).
[3] MA J F, WANG L, MA X F, et al. Design of ultrasonic liquid level measuring device and its application in laboratory[J]. Experimental Technology and Management, 2012, 29(10): 74-75(in Chinese).
[4] HOU Y L, ZHANG H X, ZHENG F Ch, et al. Optical fiber cladding mode suppressed total internal reflection sensing mechanism and liquid level probe design[J]. Journal of Luminescence, 2015, 36(3): 333-338(in Chinese). doi: 10.3788/fgxb20153603.0333
[5] ZHOU P, WU M G, ZHOU Ch H. Liquid level measurement under variable density conditions[J]. Chinese Journal of Scientific Instrument, 1998, 19(2): 3-5(in Chinese).
[6] JIN Y, REN D W, YU K, et al. Mode interference type sensor based on few-mode fiber[J]. Technological Wind, 2019, 32(13): 241(in Chinese).
[7] ZHANG X L, CHENG X Y, YAN B, et al. Research on the key factors affecting the backward rayleigh scattering waveform of distributed optical fiber sensors[J]. Optical Engineering, 2012, 39(8): 80-85(in Chinese).
[8] QU H Q, GU Y X, WU K P, et al. Design of liquid level detection system for planar capacitance sensor[J]. Laser Technology, 2021, 45(1): 48-52(in Chinese).
[9] JIANG L, SUN Zh H, TANG J, et al. Research on a measurement method of aircraft fuel level based on fiber Bragg grating pressure sensing array[J]. Journal of Sensor Technology, 2020, 33(12): 1707-1712(in Chinese).
[10] OLIVEIRA R, ARISTILDE S, OSÓRIO J H, et al. Intensity liquid level sensor based on multimode interference and fiber Bragg grating[J]. Measurement Science and Technology, 2016, 27(12): 125104. doi: 10.1088/0957-0233/27/12/125104
[11] WANG Ch, DONG X Y, CHENG D B, et al. Research on liquid level sensor based on fiber core dislocation welding in fast axis of polarization maintaining paper[J]. Sensors and Microsystems, 2016, 35(4): 42-44(in Chinese).
[12] WANG J. Research on optical fiber liquid level sensor based on high birefringence ring mirror[J]. Optica and Optoelectronics Technology, 2017, 15(3): 49-52(in Chinese).
[13] FENG D J, CHENG C, FENG W L, et al. Design and performance of liquid level sensor based on coreless fiber intensity modulation[J]. Acta Photonica Sinica, 2020, 49(5): 0506003(in Chinese). doi: 10.3788/gzxb20204905.0506003
[14] SHAO M, HAN L, ZHAO X, et al. Liquid level sensor based on on-line fiber optic Michelson interferometer[J]. Acta Optica Sinica, 2018, 38(3): 0328021(in Chinese). doi: 10.3788/AOS201838.0328021
[15] LIU Y, LL Y, YAN X J, et al. High refractive index liquid level measurement via coreless multimode fiber[J]. IEEE Photonics Technology Letters, 2015, 27(20): 2111-2114. doi: 10.1109/LPT.2015.2449279
[16] PANG Sh, LUO Zh Ch, WANG Zh M, et al. Interferometric optical fiber water level sensing system for ocean water level monitoring[J]. Acta Photonica Sinica, 2019, 48(9): 0906003(in Chinese). doi: 10.3788/gzxb20194809.0906003
[17] ALAYLI Y, TOPCU S, CHASSAGNE L, et al. Compensation of the thermal influence on a high accuracy optical fibre displacement sensor[J]. Sensors & Actuators, 2004, A120(2): 343-348.
[18] ANTONIO-LOPEZ J E, SANCHEZ-MONDRAGON J J, LIKAMWA P, et al. Fiber-optic sensor for liquid level measurement[J]. Optics Letters, 2011, 36(17): 3425-3431. doi: 10.1364/OL.36.003425
[19] ZU P, XIANG W H, BAI Y B, et al. A new type of optical fiber Sagnac magnetic field sensor based on magnetic liquid[J]. Acta Optica Sinica, 2011, 31(8): 0806005(in Chinese). doi: 10.3788/AOS201131.0806005
[20] SOLDANO L B, PENNINGS E C M. Optical multi-mode interference devices based on self-imaging: Principles and applications[J]. Journal Lightwave Technology, 1995, 13(4): 615-627. doi: 10.1109/50.372474