• Piezoelectrics & Acoustooptics
  • Vol. 46, Issue 5, 794 (2024)
DU Feng1、2, YAO Jiannan2, TAO Yifei2, XU Yuan2, DING Chao2, and LIU Yang2
Author Affiliations
  • 1Jiangsu Vocational College of Electronic Information, Huai’an 223003, China
  • 2Chongqing Key Laboratory of Modern Photoelectric Detection Technology and Instrument, Intelligent Fiber Sensing Technology of Chongqing Municipal Engineering Research Center of Institutions of Higher Education, Chongqing Key Laboratory of Optical Fiber Sensing and photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China
  • show less
    DOI: 10.11977/j.issn.1004-2474.2024.05.028 Cite this Article
    DU Feng, YAO Jiannan, TAO Yifei, XU Yuan, DING Chao, LIU Yang. Fiber Bragg Grating Elastic Diaphragm Sensor for Accurate Detection of Liquid Level[J]. Piezoelectrics & Acoustooptics, 2024, 46(5): 794 Copy Citation Text show less

    Abstract

    To detect liquid levels accurately, a liquid-level sensor is fabricated by coupling fiber Bragg grating (FBG) and an elastic diaphragm. The sensor is composed of two FBGs (FBG_1 and FBG_2), an elastic diaphragm, an elastic rubber sealing gasket, a hollow tube (an air duct), and an FBG fixing device. The FBG fixing device is composed of polymethyl methacrylate. FBG_1 and FBG_2 are fixed to the surfaces of elastic diaphragms. FBG_1 is used to monitor the liquid level and temperature. FBG_2 is encapsulated in a stainless-steel capillary tube to detect the temperature and mitigate the adverse effect of liquid-phase temperature changes on liquid-level measurement. The effect of the elastic-diaphragm thickness on liquid-level measurement is experimentally investigated to improve the linearity of the sensor’s liquid-level measuring capabilities. Additionally, we investigate the effect of the liquid-level change rate and external vibration on the liquid-level measurement accuracy. The results show that under an elastic-diaphragm thickness of 2 mm, the sensor’s linear range for detecting the liquid level is 0-380 cm, with a sensitivity of (19.65±6.3) pm/cm. The sensor can accurately monitor the liquid level within a liquid-level change rate of 0-100 cm/min and an external vibration intensity of 0-5.27 mm/s, with a maximum detection error of 7.2%.
    DU Feng, YAO Jiannan, TAO Yifei, XU Yuan, DING Chao, LIU Yang. Fiber Bragg Grating Elastic Diaphragm Sensor for Accurate Detection of Liquid Level[J]. Piezoelectrics & Acoustooptics, 2024, 46(5): 794
    Download Citation