TAILIEUCHUNG - Applying fiber bragg grating for acoustic sensor

In this work, we have interested to utilize Fiber Bragg Grating (FBG) for monitoring sound intensity level. Acoustic disturbance could induces train and changing the refractive index of FBG. Therefore, light will interfere for the trough of transmission at one specific wavelength satisfied Bragg’s condition. In our demonstrations FBG sensor was perturbed with sound intensity levels of 60, 80 and 100 dB, the measuring Bragg wavelengths were recorded at1552 nm, 1553 nm and 1555 nm, respectively. | Communications in Physics Vol. 29 No. 3 2019 pp. 215-221 DOI 0868-3166 29 3 13759 APPLYING FIBER BRAGG GRATING FOR ACOUSTIC SENSOR PARADORN PAKDEEVANICH f NATTAPON LIKITTANANAN AND WORRAPASS PROMSEN Department of Physics Faculty of Science Silpakorn University Nakorn Prathom Thailand ÌE-mail pakdeevanich_p@ Received 17 April 2019 Accepted for publication 28 June 2019 Published 15 August 2019 Abstract. In this work we have interested to utilize Fiber Bragg Grating FBG for monitoring sound intensity level. Acoustic disturbance could induces train and changing the refractive index of FBG. Therefore light will interfere for the trough of transmission at one specific wavelength satisfied Bragg s condition. In our demonstrations FBG sensor was perturbed with sound intensity levels of 60 80 and 100 dB the measuring Bragg wavelengths were recorded at1552 nm 1553 nm and 1555 nm respectively. It was found that the Bragg wavelength shift has a quite linear variation with sound intensity level. In addition the sensitivity for sensor was nm dB. The obtained results are promising for developing acoustic and vibration sensors Keywords fiber-optic detection of sound optical fibre sensors fiber Bragg grating sensor sound intensity sensor acoustic sensor. Classification numbers . 2019 Vietnam Academy of Science and Technology 216 APPLYING FIBER BRAGG GRATING FOR ACOUSTIC SENSOR I. INTRODUCTION In the last decade tremendous amount of innovation in optical fiber sensors had been challenged to monitor some physical parameters namely temperature pressure acceleration rotation force and vibration of structure. Because of many advantages including immunity towards electromagnetic interference highly sensitive and compactness fiber optic sensors perform reliable and highly sensitive tasks over conventional electrical sensors Fiber-optic sensor works by modulating one or more properties of a propagating light wave including intensity phase .

• Vật lý
• Fiber optic detection of sound
• Optical fibre sensors
• Fiber Bragg grating sensor
• Sound intensity sensor acoustic sensor
• FBG wavelength shifts