Low-Cost Technique for Measuring Distributed Strain and Temperature in Long Optical Fibers

Period of Performance: 09/22/1998 - 12/31/2000


Phase 2 SBIR

Recipient Firm

In-harmony Technology Corp.
101 South San Antonio Rd.
Petaluma, CA 94952
Principal Investigator

Research Topics


In Phase I research effort, we proposed and developed a novel Fourier transform based fiber optic sensor for distributed strain measurement along a fiber coil. This novel sensing system uses a wavelength tunable laser diode, an inexpensive single mode fiber, a photo detector and an electronic signal processing unit. Unlike the existing and reported distributed fiber sensor system that uses the polarization preserving fiber, our proposed fiber sensor system uses an inexpensive single mode fiber. This is very important for measuring strain distribution of fiber coil in missile guiding system where single mode fiber is commonly used. Our Phase I effort has demonstrated experimentally the feasibility of this novel sensing technique. During the Phase II research stage, we will continue to improve and refine the fiber sensor system developed in Phase I. A user-friendly prototype will be built. The prototype can be used for measuring the stress, strain, and temperature distribution of the fiber coil in the fiber-optics-guided missile system.