Back to results
US 4,270,050 AGranted
Apparatus for measuring pressure by absorption spectrum change
AssigneeASEA Aktiebolag
InventorTorgny Brogardh
Life of this patent
Estimating the term…
Abstract
A fiber optical measuring device for measuring physical magnitudes comprises a transducer having a body constituting an optical modulator. The optical properties of the modulator are dependent on the mechanical forces acting on the modulator. The optical property utilized is the pressure dependency of at least one light-absorption edge of the absorption spectrum of the modulator material. Optical fibers are used for leading light into the modulator and for leading out light that has passed through the modulator.
Claims15
Optical measuring device for measuring physical parameters, comprising:
- a transducer for transforming a physical parameter to be measured into mechanical stresses in at least one modulator included in the transducer, said modulator comprising a material having optical properties dependent on said mechanical stresses;
- means for radiating said transducer with light;
- and
- means for measuring the optical properties of said modulator by means of light affected by said modulator, said optical properties being varied by the pressure dependency of at least one absorption edge in the light-absorption spectrum of said material.
1 more element
Dependencies are inferred from the claim text.