| 摘要 |
PROBLEM TO BE SOLVED: To find a range with precision between an object which is to be measured and the imaging lens of a observation optical system, for improved, in precision, image magnification and sensitivity correction for an accurate solid form information of the body, by flag-displaying a range-finding reference point of the object on a monitor for observing a moire fringe, related to a lattice projection type moire device provided with a fringe scan function. SOLUTION: A moire fringe measurement is performed while a projection lattice is fringe-scanned, a 3-dimension data of a body which is to be measured is calculated from the measuring result, a range-finding reference point P (X, Y, Z) of the object is selected from the 3-dimension data, and the range-finding reference point P (X, Y, Z) is flag-displayed on a monitor 18 for observing a moire fringe measurement. Thus, with a pixel flag-displayed as an index, a range between the object and the imaging lens is measured.
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