Interferometry systems and methods of using interferometry systems
First Claim
1. A method, comprising:
- interferometrically monitoring a distance between an interferometry assembly and a measurement object along each of three different measurement axes while moving the measurement object relative to the interferometry assembly;
determining values of a first parameter and a second parameter for different positions of the measurement object from the monitored distances, wherein for a given position the first parameter is based on the monitored distances of the measurement object along each of the three different measurement axes at the given position, and for a given position the second parameter is based on the monitored distance of the measurement object along each of two of the measurement axes at the given position;
deriving information about a surface figure profile of the measurement object from the first and second parameter values; and
outputting a signal based on the derived information.
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Abstract
In general, in one aspect, the invention features methods that include interferometrically monitoring a distance between an interferometry assembly and a measurement object along each of three different measurement axes while moving the measurement object relative to the interferometry assembly, determining values of a first parameter and a second parameter for different positions of the measurement object from the monitored distances, wherein for a given position the first parameter is based on the monitored distances of the measurement object along each of the three different measurement axes at the given position, and for a given position the second parameter is based on the monitored distance of the measurement object along each of two of the measurement axes at the given position, and deriving information about a surface figure profile of the measurement object from the first and second parameter values.
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Citations
45 Claims
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1. A method, comprising:
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interferometrically monitoring a distance between an interferometry assembly and a measurement object along each of three different measurement axes while moving the measurement object relative to the interferometry assembly; determining values of a first parameter and a second parameter for different positions of the measurement object from the monitored distances, wherein for a given position the first parameter is based on the monitored distances of the measurement object along each of the three different measurement axes at the given position, and for a given position the second parameter is based on the monitored distance of the measurement object along each of two of the measurement axes at the given position; deriving information about a surface figure profile of the measurement object from the first and second parameter values; and outputting a signal based on the derived information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 36, 37, 40)
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32. An apparatus, comprising:
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a interferometer assembly configured to produce three output beams each including interferometric information about a distance between the interferometer and a measurement object along a respective axis; and an electronic processor configured to determine values of a first parameter and a second parameter for different positions of the measurement object from the interferometric information, wherein for a given position the first parameter is based on the distances of the measurement object along each of the respective measurement axes at the given position, and for a given position the second parameter is based on the monitored distance of the measurement object along two of the respective measurement axes at the given position and the monitored distance of the measurement object along one of the respective measurement axes at another position, the electronic processor being further configured to derive information about a surface figure profile of the measurement object from the interferometric information. - View Dependent Claims (33, 34, 35, 38, 39)
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41. A method, comprising:
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interferometrically monitoring a distance between an interferometry assembly and a measurement object along each of three different measurement axes while moving the measurement object relative to the interferometry assembly; determining values of a first parameter for different positions of the measurement object from the monitored distances, wherein for a given position the first parameter based on the monitored distance of the measurement object along each of two of the measurement axes at the given position and on the monitored distance of the measurement object along one of the measurement axes at another position; deriving information about a surface figure profile of the measurement object from the first parameter values; and outputting a signal based on the derived information. - View Dependent Claims (42, 43, 44, 45)
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Specification