OPTICAL DEVICE, AND METHOD OF MEASURING THE DIMENSION OF OBJECT USING OPTICAL DEVICE

摘要

A device and a method for measuring the sizes of a remote object, for example, concrete crack, without using a high-place work vehicle or a ladder. An optical apparatus (e. g. a measuring device (10)) used for this purpose is provided with a telescope (16) having a reticule plate (46). The reticule plate (46) is provided with a plurality of reference scales (52) used for comparison with the size (W) of the image (C') of an object (C) projected onto the reticule plate (46). The size of the object can be measured using the size of the object image measured with the reference scales (52) and a distance (a distance from a reference point P 0 to the object) measured with a distance measuring unit (20) of the optical apparatus.