| 摘要 |
PURPOSE:To measure a distance to an object by radiating an electromagnetic wave to the object existing in an unknown place and allowing its reflected wave to be made incident on a receiving part, and also, allowing an electromagnetic wave of the same wavelength to be made incident on the receiving part existing in a place of a known distance, and detecting the interference intensity which is generated thereby. CONSTITUTION:A light beam from a spectroscope 6 is split by a beam splitter 7, and one light beam is brought to a light quantity detection 8 and goes to a signal S1 through an amplifier 12, and inputted to a dividing circuit 14. The other light beam is split into two directions by a beam splitter 9, and one light beam travels toward a fixed reflecting mirror 10, and the other light beam travels toward an object 15 whose distance is measured. Subsequently, both the light beams are reflected by the reflecting mirror 10 and the object 15, and the intensity of an interference light generated on the splitter 9 is brought to a light quantity detection 11, and its light goes to a signal S2 through an amplifier 13 and inputted to the circuit 14. A signal S3 which is brought to the signal S1 and S2 is inputted to a CPU16, and by analyzing the signal S3, the maximum value or the minimum value generated by an interference is detected. At that time, wavelength information from the spectroscope 6 is inputted to the CPU16, and a wavelength when the intensity takes an extreme value is detected. By the detected wavelength and a known distance (d), a measuring distance (x) can be measured.
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