Infrared radiation source and its application for gas measurement
First Claim
1. A pulsed, radiation-cooled thermal infrared radiation source comprising at least one electrically conductive element made from a thin, foil-shaped material which is partially or wholly adapted to be heated from a lower temperature level To to a certain higher temperature level Tm that is maintained for a time period of duration θ
- by means of a pulse of electric current and to be pulse-wise cooled after each of said current pulse by means of thermal radiation, and electrical means arranged to supply energy to said electrically conductive element in the form of said pulse of electric current, characterized in that the thickness of those parts of said electrically conductive element which are partially or wholly adapted to be heated to said higher temperature level Tm satisfies the relation
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Abstract
Electrically pulsed infrared radiation source made from a thin foil-shaped material, which may be operated as required with temperature amplitudes of 100 K or more at millisecond pulse lengths. The source may be manufactured from known materials, and may be mounted in a preferred design as a curve-shaped bridge between two fixtures. The radiation source is particularly well adapted to be used in connection with pulse based methods and sensors for identification, measurement and warning of gas occurrences by means of infrared radiation. Examples of such methods and sensors are included in the invention.
15 Citations
12 Claims
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1. A pulsed, radiation-cooled thermal infrared radiation source comprising at least one electrically conductive element made from a thin, foil-shaped material which is partially or wholly adapted to be heated from a lower temperature level To to a certain higher temperature level Tm that is maintained for a time period of duration θ
- by means of a pulse of electric current and to be pulse-wise cooled after each of said current pulse by means of thermal radiation, and electrical means arranged to supply energy to said electrically conductive element in the form of said pulse of electric current, characterized in that the thickness of those parts of said electrically conductive element which are partially or wholly adapted to be heated to said higher temperature level Tm satisfies the relation
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
Specification