Fiber optical devices for measuring physical phenomenon
AssigneeASEA Aktiebolag
InventorsMorgan Adolfsson, Torgny Brogardh
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Abstract
The invention relates to a fiber optical device for measuring physical magnitudes such as force, elongation, pressure, acceleration, temperature, etc., comprising a transducer unit and an electronic unit, in which the quantity to be measured is supplied to the transducer unit to affect the resonance frequency of an oscillating body included in the tansducer unit by changing the dimensions, mass, density, modulus of elasticity and/or mechanical stress of the body. A property of the body oscillation, such as frequency, phase position and/or amplitude, is used as a value of the quantity to be measured. The oscillations of the body are detected optically by means of a fiber optical position/movement detector.
Claims20
Fiber optical device for measuring physical phenomenon, comprising:
- a transducer unit including an object mounted therein and adapted to oscillatate at a resonant frequency thereof and having a property of oscillation altered in response to a change in physical characteristic of said object induced by stimulus of the physical phenomena being measured, and including at least one light conducting fiber having a fiber optical position/movement detector element mounted in operative association with said object to detect said altered oscillation property;
- processing means for generating an output signal representative of the phenemena being measured in response to an output of said fiber optical detector element;
- and
- excitation means for generating energy causing said object to oscillate, and including optical transmission means for transmitting oscillating energy to said transducer unit, said means for transmitting including at least one light conducting fiber for optically transmitting said oscillating energy.
Dependencies are inferred from the claim text.