Optical Sensors

Highly sensitive liquid-level sensor based on weak uniform fiber Bragg grating with narrow-bandwidth

[+] Author Affiliations
Yi Dai, Qizhen Sun, Jianghai Wo, Xiaolei Li, Manliang Zhang, Deming Liu

National Engineering Laboratory, for Next Generation Internet Access System, Wuhan 430074, Hubei, China

Huazhong University of Science and Technology, The College of Optoelectronic Science and Engineering, Wuhan 430074, Hubei, China

Opt. Eng. 51(4), 044401 (Mar 28, 2012). doi:10.1117/1.OE.51.4.044401
History: Received November 7, 2011; Revised February 1, 2012; Accepted February 6, 2012
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Abstract.  A highly sensitive liquid-level sensor based on weak uniform fiber Bragg grating (FBG) with narrow-bandwidth is proposed and demonstrated. The resonance wavelength of FBG varies as a result of the change of axial strain. According to this characteristic, a precise approach utilizing fiber grating as sensing element to measure height of liquid is achieved. The grating is directly bonded to a float which can transfer buoyancy into axial strain on the fiber. Measurement of liquid level can be realized by monitoring the central wavelength shift of the sensing FBG. The experimental results show that for a liquid-level variation of 25 mm, a high sensitivity of 5.9×106m/pm with a good linearity of 0.991 is achieved. Within bidirectional change of liquid level, crossing sensitivity and long term stability taken into account, the system is of good reliability and stability.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Yi Dai ; Qizhen Sun ; Jianghai Wo ; Xiaolei Li ; Manliang Zhang, et al.
"Highly sensitive liquid-level sensor based on weak uniform fiber Bragg grating with narrow-bandwidth", Opt. Eng. 51(4), 044401 (Mar 28, 2012). ; http://dx.doi.org/10.1117/1.OE.51.4.044401


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