Capturing device, capturing method, and capturing program

摘要

There have been problems that a capturing device requires an optical source having a large power output, and a scanning operation and a capturing operation must be alternately performed by the respective devices.;A capturing device is provided with an optical receiver which receives a beam from outside as a reception beam, a reception beam capturing unit which performs a capturing operation by which the reception beam is introduced to the optical receiver, an optical transmitter which generates a transmission beam transmitted to the outside, a transmission beam scanning unit which performs a scanning operation of the transmission beams, and an optical circulator wherein the incidence of the reception beam and the exit of the transmission beam are performed at the same terminal.

主权项

1. A capturing device comprising:
an optical receiver configured to receive a beam from outside, as a reception beam; a reception beam capturing unit adapted to perform a capturing operation to introduce the reception beam to the optical receiver; an optical transmitter configured to generate a transmission beam to transmit to outside; a transmission beam scanning unit configured to perform a scanning operation of the transmission beams; and an optical circulator in which the same terminal is used for incidence of the reception beam and exit of the transmission beam;
wherein the transmission beam scanning unit comprises:a capture controller configured to control a coarse scanning unit and a fine scanning unit by at least a first signal, a second signal, a third signal and a fourth signal;the coarse scanning unit configured to be controlled by the first signal from the capture controller to perform a part of the scanning operation by moving the transmission beam through a predetermined angle; andthe fine scanning unit configured to be controlled by the second signal from the capture controller to perform another part of the scanning operation by moving the transmission beam through an angle narrower than the predetermined angle, wherein the fine scanning unit is further configured to be controlled by the third signal from the capture controller to scan the transmission beam in accordance with a predetermined scanning path which is an overlapped spiral path which spirals from the center of a scanning range to an outside of the scanning range, and the fine scanning unit is further configured to be controlled by the fourth signal from the capture controller to scan the transmission beam in accordance with the predetermined scanning path which is the overlapped spiral path from the center of the scanning range to the outside of the scanning range such that at least one of a plurality of overlapped portions of the overlapped spiral path is a cluster of a finer overlapped spiral path within the scanning range from the center of the cluster to an outside of the cluster.