Micrometric displacement sensor based on the strain of a fiber Bragg grating with heterodyne detection of intensity in a Mach-Zehnder interferometer.

8th International Congress of Engineering Physics

物理学;工业技术

Gonzalez, H.^1,2 ; Alvarez, F.J.^1,2 ; Sandoval, G.E.^2

Pograma de Maestría y Doctorado en Ingeniería, Universidad Nacional Autónoma de México, Ciudad Universitaria, Av. Uni. 3000, Pri. piso Edif. T Ber. Qui. A., Coyoacán, Ciudad

CP 04510, Mexico^1

Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Ciudad Universitaria, Apdo. Postal 70-186, Coyoacán, Ciudad

CP 04510, Mexico^2

关键词: Angular displacement;    Displacement sensor;    Dynamic range;    High-precision;    Linear response;    Mach Zehnder interferometry;    Micrometer scale;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/792/1/012030/pdf
DOI  :  10.1088/1742-6596/792/1/012030

学科分类：工业工程学

来源: IOP

【 摘 要 】

This paper describes the implementation and characterization of a displacement sensor according to the strain of a fiber Bragg grating. The system is able to obtain measurements on micrometer scales through heterodyne detection of intensity in a Mach-Zehnder interferometry in fiber optic. For the displacement characterization, the fiber Bragg grating was attached from one end meanwhile at the other end a tension was induced by a high-precision rotation mount. Experimental results are presented for which varying the angular displacement we obtain a linear response in the amplitude of the intensity, determining a sensitivity of 0.77 pW/μm with a displacement size of 48.80 μm in a dynamic range from 0 μm to 488 μm.