Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Fiber optic rotation sensor utilizing high birefringence fiber and having reduced intensity type phase errors










Image Number 5 for United States Patent #4881817.

A fiber optic rotation sensor using birefringent optical fiber includes an uncorrelating element, an equalizing element and a polarizer in the common input and output fiber portions of the sensor to reduce or eliminate the intensity type phase errors caused by interference between lightwaves originally in the same polarization mode on entry to the sensor loop that cross couple into another polarization mode. In the preferred embodiment, the uncorrelating element comprises a birefringence modulator and a length of birefringent fiber. The equalizing element comprises a birefringent fiber having a splice at which the axes of birefringence of the spliced portions of the fiber are positioned at 45.degree. relative to each other. The preferred embodiment also advantageously includes a birefringence modulator that introduces a time-varying birefringence into the optical fiber to introduce a deterministic phase error that reduces or eliminates amplitude type phase error caused by coherent interference between field components of light that are orthogonally polarized at the input of the sensor loop and that couple to the same polarization mode within the loop.








 
 
  Recently Added Patents
Method for controlling operation of a wind turbine
Reconfigurable barrel shifter and rotator
Method and system for testing indirect bandgap semiconductor devices using luminescence imaging
System for alarming upon occurrence of secession of smart key for vehicles
Rotating-body electrification mechanism, image carrier unit, process cartridge, image forming apparatus, and method for electrifying image carrier unit
Laser marking of a card
Data processing apparatus including reconfigurable logic circuit
  Randomly Featured Patents
Hair brush stand
Methods and compositions for treating allergic disorders and other disorders metabolic derivatives of terfenadine
Treating meat from dark-cutting carcasses using an acidification process
Networked health care and monitoring system
Identifier vocabulary data access method and system
Golf driver head
Unsaturated ketones as accelerators for hydrosilation
Direct acting hydraulic tappet
High-fidelity reflection electron beam lithography
Turbo-charged relaxation oscillator method and apparatus