To highly accurately observe a relative position relation between two points separated by several meters or more, and to provide an unequal displacement state observation device which is easy to handle without using a measurement system including complicated analysis software.
A projector including a laser light emitting part for radiating a laser beam spread horizontally in a fan shape and a light receiver incorporating a light receiving element array in which a plurality of light receiving elements are arrayed at equal intervals in a vertical direction are used. The projector and the light receiver are installed between two points to be observed, and a direction is adjusted and fixed so that the laser beam of the projector enters the light receiving elements inside the light receiving element array. The light receiver is provided with a display part for displaying which light receiving element in the light receiving element array the laser beam is entering to facilitate adjustment work for the time of installation and for the time of inspections. The light receiver is provided with an output part for outputting which light receiving element the laser beam is entering, and by observing fluctuation of the output signals at a remote location, the fluctuation of relative positions between two points is accurately monitored.
TOMITA TSUNEHIRO
KICHIJI HIROSHI
KAWAGUCHI YOSHIHIRO
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