| 摘要 |
PURPOSE: To easily pick up a grained spot pattern as an interference pattern of a reflected laser light in a degree of an environment of an ordinary office. CONSTITUTION: When an object is illuminated by the laser light, the grained spot pattern appears. The pattern can not be directly viewed and picked up in the degree of the environment of the ordinary office. Previously, there has been an indirect image pickup method in which the pattern has been projected on a screen using a frosted glass in a dark room and a projected pattern has been picked up by a digital camera or a video camera. An imaging lens of the digital camera or the video camera is detached, a pipe of several centimeters for shielding an incoming light, is mounted in the front of a charge coupled device, and the grained spot pattern can be easily and directly picked up in the degree of the environment of the ordinary office.
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