Apparatus and method for measuring spectral reflectance and apparatus for measuring film thickness
First Claim
1. A spectral reflectance measurement apparatus for measuring spectral reflectance of a measurement object, comprising:
- an image pickup part for picking up an image of an object to acquire a plurality of single-band images corresponding to a plurality of wavelengths;
a correction factor setting part for setting a plurality of correction factors in accordance with distances from a specified pixel by using a plurality of reference single-band images of a reference object which are acquired by said image pickup part; and
a spectral reflectance calculation part for obtaining a corrected value of a specified pixel for each of a plurality of measurement single-band images of a predetermined area on a measurement object which are acquired by said image pickup part, by using a value of said specified pixel, values of pixels surrounding said specified pixel and said plurality of correction factors and calculating a reflectance of a position on said measurement object which corresponds to said specified pixel on the basis of said corrected value.
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Accused Products
Abstract
A film thickness measurement apparatus has an image pickup part (32) for acquiring a plurality of single-band images corresponding to a plurality of wavelengths, and the image pickup part (32) acquires a plurality of reference single-band images representing a pattern on a reference substrate. A correction factor setting part (51) performs setting of a plurality of correction factors in accordance with distances from a specified pixel by using a plurality of reference single-band images. Subsequently, the image pickup part (32) acquires a plurality of measurement single-band images representing a pattern on an objective substrate and corrects a value of the specified pixel for each of a plurality of measurement single-band images by using the value of the specified pixel and values of pixels surrounding the specified pixel and the correction factors. A spectral reflectance calculation part (52) thereby calculates a reflectance at a measurement point on the objective substrate which corresponds to the specified pixel on the basis of the corrected value of the specified pixel with high accuracy.
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Citations
20 Claims
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1. A spectral reflectance measurement apparatus for measuring spectral reflectance of a measurement object, comprising:
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an image pickup part for picking up an image of an object to acquire a plurality of single-band images corresponding to a plurality of wavelengths; a correction factor setting part for setting a plurality of correction factors in accordance with distances from a specified pixel by using a plurality of reference single-band images of a reference object which are acquired by said image pickup part; and a spectral reflectance calculation part for obtaining a corrected value of a specified pixel for each of a plurality of measurement single-band images of a predetermined area on a measurement object which are acquired by said image pickup part, by using a value of said specified pixel, values of pixels surrounding said specified pixel and said plurality of correction factors and calculating a reflectance of a position on said measurement object which corresponds to said specified pixel on the basis of said corrected value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A film thickness measurement apparatus for measuring the thickness of a film formed on a measurement object, comprising:
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an image pickup part for picking up an image of an object to acquire a plurality of single-band images corresponding to a plurality of wavelengths; a moving mechanism for moving an object relatively to said image pickup part; a control part for controlling said moving mechanism on the basis of an image acquired by said image pickup part; a correction factor setting part for setting a plurality of correction factors in accordance with distances from a specified pixel by using a plurality of reference single-band images of a reference object which are acquired by said image pickup part; a spectral reflectance calculation part for obtaining a corrected value of a specified pixel for each of a plurality of measurement single-band images of a predetermined area on a measurement object which are acquired by said image pickup part, by using a value of said specified pixel, values of pixels surrounding said specified pixel and said plurality of correction factors and calculating a reflectance of a position on said measurement object which corresponds to said specified pixel on the basis of said corrected value; and a film thickness calculation part for calculating the thickness of a film formed on said measurement object on the basis of reflectances obtained by said spectral reflectance calculation part. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A spectral reflectance measurement method for measuring spectral reflectance of a measurement object, comprising the steps of:
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picking up images of a reference object to acquire a plurality of reference single-band images; setting a plurality of correction factors in accordance with distances from a specified pixel by using said plurality of reference single-band images; picking up images of a predetermined area on a measurement object to acquire a plurality of measurement single-band images corresponding to a plurality of wavelengths; obtaining a corrected value of a specified pixel for each of said plurality of measurement single-band images by using a value of said specified pixel, values of pixels surrounding said specified pixel and said plurality of correction factors; and calculating a reflectance of a position on said measurement object which corresponds to said specified pixel on the basis of said corrected value, the calculated reflectance being stored on a computer medium. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification