| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a light detecting device which can always accurately detect a detecting visual field without relying on an operator. SOLUTION: In this device, the light from a measuring object is condensed by a condensing part 5, and its light is transmitted through optical fiber 6, and is photoelectrically transferred by a photoelectric transfer part 7, and the existence, a temperature or the like of the measuring object are detected on the basis of its output. A light projecting means 8 which is selectively joined to the optical fiber 6 and projects the light on the measuring object side through the optical fiber 6 and the condensing part 5 and a light detector 12 to detect the light projected from this light projecting means 8 are provided, and are constituted so that a detecting visual field of the measuring object can be detected on the basis of output of this light detector 12.</p> |
