Temperature Compensated Refractometer Based on a Cascaded SMS/LPFG Fiber Structure
A hybrid optical fiber structure for refractive index (RI) measurement with the temperature compensation capability is reported. The structure consists of a CO2 laser-induced long period fiber grating (LPFG) and a section of single mode-multimode-single mode (SMS) fiber structure. The LPFG serves as a refractometer with a temperature compensator using a simple SMS fiber structure. The sensing mechanism of this device has been investigated and experimentally demonstrated. The SMS structure was insensitive towards the change in the ambient RI but was sensitive towards the changes in the ambient temperature whereas the LPFG was sensitive towards both. A sensitivity matrix was built to compensate the temperature-RI crosstalk. The capability of simultaneous measurement of temperature and RI of the sensor was experimentally validated.
J. Huang et al., "Temperature Compensated Refractometer Based on a Cascaded SMS/LPFG Fiber Structure," Sensors and Actuators B: Chemical, vol. 198, pp. 384-387, Elsevier, Jul 2014.
The definitive version is available at https://doi.org/10.1016/j.snb.2014.03.062
Electrical and Computer Engineering
National Energy Technology Laboratory (U.S.)
Keywords and Phrases
Carbon dioxide; Fiber optic sensors; Fibers; Refractive index; Refractometers, Long period fiber grating; Mode structure; Optical fiber structures; Refractive index measurement; Simultaneous measurement; Temperature compensated; Temperature compensation; Temperature compensators, Multimode fibers; Single mode-multimode-single mode structure; Temperature compensated refractometer
International Standard Serial Number (ISSN)
Article - Journal
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