| 摘要 |
A range finder for optically or electronically measuring distance from an object by comparison of a known curvilinear form or spectrum of points with the object being measured. The range finder, whether optical or electronic, is provided with different size outlines or stored images of the object, the different sizes representing the object as it would appear at different distances from the viewer. In its optical form, a number of different size outlines are provided on a transparency through which the object itself is viewed. The outline of the object as actually viewed is compared or matched with the known outline and the distance to the object is determined by relating the size of the actual outline to the closest size outline. In the electronic form, the comparison is made electronically rather than optically or visually. In both forms, only a portion of the object being measured need be visible for making the comparison.
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