| 摘要 |
PURPOSE:To discriminate the position of an object in addition to the shape of the object, by allowing a coherent parallel light to pass through an freely attachable and detachable mesh shaped two-dimensional grating whose pitch is changed linearly in vertical and horizontal directions in accordance with positions. CONSTITUTION:The light from an object 30 to be recognized is reflected by a means 7 and is focused onto a filter 9 by a lens 8 and passes through an optical valve 29 to form a luminous flux 34, and this luminous flux 34 passes through an analyzer 24 and a light valve 25 and is focused onto a detector 28 through a two-dimensional grating plate 27 and a Fourier conversion lens 26. The two-dimensional grating 27 has the pitch changed linearly in vertical and horizontal directions in accordance with positions and is freely attached and detached; and in the detector 28, photoelectric converting elements are arranged into the shape of L. The laser light from a light source 10 is polarized linearly by a means 12 and is reflected by a mirror 13 to become a parallel light, and this parallel light passes through the light valve 29 and the analyzer 24 and has the amplitude modulated by the image of the object 30 on the optical valve 29 and passes through the filter 25 and the grating plate 27 and is subjected to Fourier conversion by the lens 26 and is focused onto the detector 28. Thus, the position of the object 30 is discriminated, and the grating plate 27 is removed to discriminate the attitude of the object 30. |
