Fiber optical temperature measurement devices
AssigneeASEA Aktiebolag
InventorsTorgny Brogardh, Lars Sander
Life of this patent
Estimating the term…
Abstract
The invention relates to a fiber optical temperature measuring device of the pyrometer type, comprising a transducer section and an electronic section, which are mutually interconnected by at least one optical fiber. The electronic section includes at least one light source and the light therefrom is arranged to be emitted via the optical fiber to the transducer, and in the transducer at least part of the light is reflected back into the fiber and is conducted through the optical fiber together with an output measuring signal from the transducer to one or more detectors included in the electronic section.
Claims15
Fiber optical measuring device for measuring the temperature of a temperature sensitive object, comprising:
- means for radiating light;
- a transducer reflecting light from said means for radiating light and including said temperature sensitive object emitting temperature induced radiation, said reflected light and said emitted radiation respectively representing a reference signal and a measuring signal and forming a composite signal;
- detector means for detecting said composite signal and providing a composite output signal;
- separating means responsive to said composite output signal for separating said reference signal and said measuring signal to produce an electrical reference signal and an electrical measuring signal, respectively;
- at least one optical fiber for interconnecting said means for radiating light and said transducer, and for interconnecting said detector means and said transducer to transmit said composite signal;
- means for combining said electrical reference and said electrical measuring signal to provide an output signal representative of the temperature of said temperature sensitive object compensated for instabilities in said transducer, detector means, separating means, and said at least one optical fiber;
- and
- wherein said means for combining further includes circuit means responsive to said electrical reference signal for generating another output signal representative of the square root thereof, and said another output signal and said electrical measuring signal are combined to produce said output signal.
Dependencies are inferred from the claim text.