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
Machine tool with an electrical generator for passive power generation
System and method for a TCP mapper
Spark plug
System and method for investing public deposits
Laminar library screen
Decontamination apparatus and method
Apparatus and method for multiple pagings in broadband wireless communication system
  Randomly Featured Patents
Cornice box
Three-dimensional information detecting system, three-dimensional information detecting device and input device for three-dimensional information detecting system
Kickback-inhibiting devices for cutting devices
Container collection apparatus with electromagnetic sensor and method
Local area network system
Position detecting method and position detecting device for detecting relative positions of objects having position detecting marks by using separate reference member having alignment marks
Chain link for a conveyor chain
Haloacyl and thiohaloacyl aryl-substituted oxazolidines and thiazolidines herbicidal antidotes
Device for separating solid substances from liquids
Condensed polycyclic .pi.-conjugated organic material, intermediate product therefor, and method of manufacturing condensed polycyclic .pi.-conjugated organic material