| 摘要 |
Infra-red images are projected onto an infra-red detector whose output is amplified, linearized, digitized and displayed as a numerical value corresponding to the temperature of the object viewed by the infra-red optical system. The optical axis of the infra-red optical system is coaxial with the optical axis of a visible light optical system which is used for sighting and aligning the field of view of the infra-red optical system with the object. Through the eyepiece of the visible light optical system an observer sees the object, the scene area surrounding the object and the numerical value of the temperature of the object as indicated by a digital readout whose image is superimposed over the scene.
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