Fiber-optic temperature-measuring apparatus
AssigneeASEA Aktiebolag
InventorsOlof Engstrom, Christer Ovren
Life of this patent
Estimating the term…
Abstract
A fiber-optic temperature-measuring apparatus which monitors the photo-luminescence of a body of solid material subjected to the temperature to be measured. Exciting radiation is conducted by means of at least one optical fiber towards a material with temperature-dependent luminescence which is in optical contact with the fiber, whereby luminescence occurs. The radiation emitted as a consequence of the luminescence is transmitted via at least one optical fiber from the body to a place of measurement, where a measure of the temperature may be obtained. The luminescent body may consist of a semiconductor material.
Claims28
A fiber-optic temperature-measuring apparatus comprising:
- a body of a temperature-dependent photo-luminescent solid semi-conductive material wherein said body is subjected to a temperature to be measured;
- a source of exciting radiation directed to said body so as to cause said body to luminesce and produce luminescent radiation;
- fiber-optic means for directing said exciting radiation to said body;
- measuring means operatively associated with said body;
- fiber-optic means for directing said luminescent radiation from said body to said measuring means;
- and
- two photodetectors having mutually dissimilar spectral response curves operatively associated with said measuring means and provided for receiving said luminescent radiation via said fiber optic means for directing said luminescent radiation from said body to said measuring means.
A fiber-optic temperature-measuring apparatus comprising first and second bodies of temperature-dependent photo-luminescent solid material, the first of which bodies is subjected to the temperature to be measured, thermal control means for modifying the temperature of the second body, means for measuring the temperature of the second body, at least one source of exciting radiation for the said bodies which will cause each to luminesce, fiber-optic means for feeding exciting radiation to the two bodies and for feeding luminescent radiation from the bodies to electro-optical measuring means, means for determining from the electrical output of the measuring means when the luminescent radiation from the two bodies is the same and thus when the temperature of the first body equals the measured temperature of the second.
Dependencies are inferred from the claim text.