Method to athermalize a long-period fiber grating for interrogation of fiber Bragg grating-based sensors

作者：Mamidi Venkata Reddy^*; Kamineni Srimannarayana; Ravinuthala L N Sai Prasad; Thumu Venkatapparao; Pachava Vengal Rao

来源：Optical Engineering, 2014, 53(9): 096111.

DOI：10.1117/1.OE.53.9.096111

• long-period grating
• wavelength conversion
• intensity modulation
• fiber Bragg grating interrogation

A method is proposed to minimize the effect of temperature on a long-period fiber grating (LPG), enabling its effective use for the interrogation of wavelength-modulated fiber Bragg grating (FBG) sensors. The temperature dependence of LPG is compensated by means of creating the opposite effect from the temperature-induced strain, attributed by appropriately encapsulating in a specially designed Teflon tube. The encapsulated LPG has achieved six times stabilization over the bare LPG response for the temperature range of 20 degrees C to 50 degrees C. Application of the athermalized LPG for interrogation of an FBG-based temperature sensor is experimentally demonstrated.

• 出版日期2014-9