EP 0819242 A1 19980121 - BIREFRINGENT OPTICAL TEMPERATURE SENSOR WITH ADJUSTABLE TEMPERATURE SENSITIVITY
Title (en)
BIREFRINGENT OPTICAL TEMPERATURE SENSOR WITH ADJUSTABLE TEMPERATURE SENSITIVITY
Title (de)
OPTISCHER, DOPPELBRECHENDER TEMPERATURSENSOR MIT EINSTELLBARER EMPFINDLICHKEIT
Title (fr)
CAPTEUR DE TEMPERATURE DE TYPE OPTIQUE BIREFRINGENT A SENSIBILITE REGLABLE
Publication
Application
Priority
- US 9604555 W 19960403
- US 41589495 A 19950403
Abstract (en)
[origin: WO9631763A1] An optical temperature sensor for use in a temperature detector system having at least two birefringent crystal elements arranged in tandem. A collimated broad band light source is transmitted via a fiber optic cable, a polarizer to a first birefringent crystal element. The first crystal element decomposes the light wave into first and second orthogonally polarized waves and transmits the wave components to a second birefringent crystal element. The linearly polarized waves propagate through the birefringent crystals, and the environmental temperature introduces a temperature dependent phase shift between the two polarized waves. The light waves exit the second crystal to a second polarizer producing a modulated light spectrum. A focusing element collects the light and transmits it down another fiber optic cable. The cable transmits the light to an opto-electronic interface where the fringe pattern is extracted and a computer compatible signal is generated for a CPU. The CPU performs a Fourier transform on the fringe pattern, where the phase term for a selected frequency is the measure of the environmental temperature experienced by the birefringent crystals.
IPC 1-7
IPC 8 full level
G01K 11/18 (2006.01); G01K 11/32 (2006.01)
CPC (source: EP)
G01K 11/18 (2013.01); G01K 11/3206 (2013.01)
Citation (search report)
See references of WO 9631763A1
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
DOCDB simple family (application)
US 9604555 W 19960403; EP 96911553 A 19960403