| 摘要 |
PURPOSE:To measure the length of the optical path between a projection light source and one point on the surface of a body, to calculate the shape of the body by specific arithmetic, and to improve the measurement accuracy by reflecting a projection wave which is distributed at one focus of an elliptic reflecting mirror by the elliptic reflecting mirror, and scanning the wave on the body. CONSTITUTION:This method consists of an optical distance measuring instrument 10 which employs a phase difference system, a scanner 11, the elliptic reflecting mirror 12, etc. When the capacity of a cargo mounted on, for example, a truck T is measured, the light of the device 10 is distributed 11 and reflected 12 and the truck T is moved at the same time to take a measurement 10 of the distance to the surface of the cargo, i.e. optical path length. This optical path length is measured by inputting signals when a sine wave, a rectangular wave, a pulse wave, etc., modulated to a constant frequency are projected by the device 10 and photodetected and detecting the phase difference between the projection wave and received wave, and then converting the phase difference into the length. The capacity W of the cargo is calculated by a CPU, etc., from a specific expression based upon this value.
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