Title :
Embedded dual fiber Bragg grating sensor for temperature-load (strain) discrimination
Author :
Mondal, Samir K. ; Mitra, Anupam ; Tiwari, Umesh ; Pant, Jayshreekar ; Jain, Subhash C. ; Mishra, Vandana ; Poddar, G.C. ; Singh, Nahar ; Kapur, Pawan
Author_Institution :
Central Sci. Instrumentations Organ., Chandigarh
Abstract :
An embedded dual fiber Bragg gratings sensor for temperature and strain discrimination is proposed and demonstrated. Two nearly identical gratings are mounted opposite side of an arch-shape steel strip. The gratings in concave and convex position experiences equal blue and red shift due to bending of the strip under compressive and tensile strains respectively. The thermal response and strain response are separated by addition and subtraction of the resultant shifts from two gratings. The thermal and strain sensitivity of the sensor is improved to 30 pm/degC and 2.6 pm/muepsiv. The sensor can measure strain and temperature with a permissible error of plusmn 1 muepsiv and plusmn 1.5degC respectively.
Keywords :
Bragg gratings; fibre optic sensors; intelligent sensors; optical fibres; strain sensors; temperature sensors; compressive strains; embedded dual fiber Bragg grating sensor; strain discrimination; strain response; temperature-load discrimination; tensile strains; thermal response; Bragg gratings; Capacitive sensors; Fiber gratings; Microwave sensors; Steel; Strain measurement; Strips; Temperature sensors; Tensile strain; Thermal sensors; Embedded grating sensor; FBG sensor; fiber Bragg grating (FBG); strain and temperature;
Conference_Titel :
Recent Advances in Microwave Theory and Applications, 2008. MICROWAVE 2008. International Conference on
Conference_Location :
Jaipur
Print_ISBN :
978-1-4244-2690-4
Electronic_ISBN :
978-1-4244-2691-1
DOI :
10.1109/AMTA.2008.4763110
