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Abstract

A method for sensing a spatial coordinate of a point of an article, wherein a main coherent light field is formed in the area of the article and an approximate coordinate of a selected point of the article is found by means of an optical characteristic of this field. Simultaneously, a system of additional coherent light fields is formed in the area of the article, said light fields having periodic spatial and temporal modulation of illumination, and engaged in no interaction with the main coherent light field and between one another. The phase of each additional coherent light field in the selected point of the article is measured. Making use of the already obtained approximate coordinate of the selected point of the object and the measured phases, increasingly accurate coordinates of the selected point of the article are successively found. An apparatus for realizing the proposed method includes transmitting and receiving sections. The transmitting section is intended to form the main coherent light field and a system of additional coherent light fields, and has a main transmitting optical channel and a set of additional transmitting optical channels. The receiving section has a main and additional receiving channels and a coordinate computing unit. The receiving channels measure the optical characteristic and the phase of, respectively, the main and each of the additional coherent light fields, the resulting measurements being fed to the coordinate computing unit.

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First Claim