Accession Number : ADA185359
Title : Fiber-Optic Accelerometer Investigation.
Descriptive Note : Master's thesis,
Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
Personal Author(s) : Zukauskas, Waldemar
PDF Url : ADA185359
Report Date : Jan 1987
Pagination or Media Count : 85
Abstract : A fiber-optic accelerometer concept based on the radial displacement of a hollow cylinder subject to acceleration is experimentally investigated. The accelerometer configuration consists of two PZT cylinders wrapped with 2.3 meters of high birefringent single mode fiber placed in a differential configuration. Cylinder radial displacement induces an axial strain into the fiber which stretches the fiber, causing a simultaneous optical path length and index of refraction change. The result is an overall phase change of the light propagating in the fiber, causing a simultaneous optical path length and index of refraction change. Acceleration is hence measured by ac detecting and scaling the phase change. Optical common mode rejection is achieved via a 90 degree fiber rotation and splice. Polarization, phase, and temperature stability for the system with and without optical common moding is investigated. A theoretical system scale factor and is calculated and used to determine the minimum detectable acceleration sensed for a 50 volt dc step input simulating induced acceleration. System noise is examined and compared to the photon shot noise limit.
Descriptors : *ACCELEROMETERS, *PIEZOELECTRIC TRANSDUCERS, *FIBER OPTICS, BIREFRINGENCE, SIMULATION, SHOT NOISE, TEMPERATURE, POLARIZATION, ROTATION, ALUMINUM, DRIFT
Subject Categories : Navigation and Guidance
Distribution Statement : APPROVED FOR PUBLIC RELEASE