A New Technique to Sense Humidity Based on Optical Heterodyne detection

2nd International Conference on Sustainable Engineering Techniques

工业技术（总论）

Resen, D.A.^1 ; Kadhim, S.A.^2 ; Lateef, A.T.^2 ; Mahmood, A.I.^2

Institute of Technology, Middle Technical University, Baghdad, Iraq^1

Materials Research Dir., Ministry of Science and Technology, Iraq^2

关键词: Beat frequency;    Heterodyne technique;    Humidity sensing;    Laser sources;    Reflected light;    Sensing elements;    Single fiber;    Single source;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/518/4/042029/pdf
DOI  :  10.1088/1757-899X/518/4/042029

学科分类：工业工程学

来源: IOP

【 摘 要 】

A new method of shifting in phase of optical heterodyne detection for humidity sensing have been proposed and demonstrated. In this paper, optical heterodyne techniques by using single source with single Fiber Brag Grating (FBG) were designed and studied. In this work FBG has been used as a light source and sensing element at the same time. FBG used as a laser source to achieve heterodyne detection through combine its reflected light with main laser source. Furthermore a combined lights was generated a beat frequency (F-B). The simulation results proved the ability of the proposed technique to achieve the requires sensitivity about 0.142 GHz / %RH.