Radiant energy – Infrared-to-visible imaging – Including detector array
Patent
1997-11-20
1999-11-30
Westin, Edward P.
Radiant energy
Infrared-to-visible imaging
Including detector array
2503381, H01L 2716
Patent
active
059946997
ABSTRACT:
Thermographic infrared cameras are disclosed that comprise an infrared image sensor having linearly positioned thermosensing elements. A physical property of each thermosensing element changes in proportion to a corresponding temperature change caused by infrared irradiation incident on the thermosensing element. The infrared image sensor comprises a read device that reads signals from each thermosensing element in an ordered manner. A logarithmic converter receives signals from the infrared image sensor and outputs corresponding logarithmic values of the signals. An image information output device receives the logarithmic values from the logarithmic converter and outputs a corresponding infrared image. Such thermographic infrared cameras can further comprise a reference infrared image sensor. The reference infrared image sensor includes reference thermosensing elements each having a physical property that exhibits a change in value in proportion to a temperature change of the respective thermosensing element. A compensating logarithmic converter outputs a logarithmic value of the ratio of the signal read by the infrared sensor and the signal read by the reference infrared sensor. An image information output device receives the logarithmic values output by the compensating logarithmic converter and outputs corresponding infrared image information.
REFERENCES:
patent: 4409483 (1983-10-01), Turley
patent: 4712010 (1987-12-01), Alm
Hanig Richard
Nikon Corporation
Westin Edward P.
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