| 摘要 |
PURPOSE:To remove the narcissus phenomenon by making use of a narcissus signal that a detecting element which scans optically the shielding part of a visual-field limit frame generates, by providing this detecting element independently. CONSTITUTION:One element Di in an element array photodetects the infrared ray of an object to be observed arriving along optical axis 1a. On photodetecting an infrared ray radiated by limit frame FS, detecting element Do receives its own radiated ray reflected by relay lens 2a. The output signal of detecting element Di for temperature sensing is subtracted from that of detecting element Do for the temperature sensing of the visual-field limit frame to eliminate a narcissus signal component that detecting elements for the temperature sensing of the oabserved object, so that the uniform temperature of the object can be obtained. |
