| 摘要 |
PURPOSE:To adjust simply the optical axis of an optical transmitter/receiver without deteriorating the strength of reception by detecting light passing through a slit by a linear light sensor and using an output of the said sensor to detect the shift of optical axes between the transmitted light and received light. CONSTITUTION:A part of the received light 11 from a satellite station passes through a slit 22 and the image of the slit is formed on the linear light sensor 21. Since the received light 11 is radial light, when the optical axis of the transmitted and received light of the transmitter/receiver is coincident, four slit images 23U, 23D, 23L and 23R are formed on a position of an equal distance from a center point of a sensor mounting board. Thus, the optical axes between transmission and reception are made coincident by controlling a universal head with a differential output of the linear light sensors 21U, 21D, 21L and 21R mounted at an equal distance from the center point so that the four slit images 23U, 23D, 23L and 23R are formed equally from the center. |
