Vibration resistant interferometry
First Claim
1. A method comprising:
- providing scanning interferometry data for a test object, the data comprising intensity values for each of multiple scan positions for each of different spatial locations of the test object, the intensity values for each spatial location defining an interference signal for the spatial location, the intensity values for a common scan position defining a data set for that scan position;
providing a scan value for each scan position, wherein increments between the scan values are non-uniform, the scan values being determined based on the scanning interferometry data and an initial estimate of values for the scan positions;
transforming at least some of the interference signals into a frequency domain with respect to the scan values;
determining information about the test object based on the transformed interference signals; and
outputting a value based on the information about the test object.
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Abstract
A method includes providing scanning interferometry data for a test object, the data including intensity values for each of multiple scan positions for each of different spatial locations of the test object, the intensity values for each spatial location defining an interference signal for the spatial location, the intensity values for a common scan position defining a data set for that scan position. The method includes providing a scan value for each scan position, wherein increments between the scan values are non-uniform, transforming at least some of the interference signals into a frequency domain with respect to the scan values, and determining information about the test object based on the transformed interference signals.
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Citations
21 Claims
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1. A method comprising:
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providing scanning interferometry data for a test object, the data comprising intensity values for each of multiple scan positions for each of different spatial locations of the test object, the intensity values for each spatial location defining an interference signal for the spatial location, the intensity values for a common scan position defining a data set for that scan position; providing a scan value for each scan position, wherein increments between the scan values are non-uniform, the scan values being determined based on the scanning interferometry data and an initial estimate of values for the scan positions; transforming at least some of the interference signals into a frequency domain with respect to the scan values; determining information about the test object based on the transformed interference signals; and outputting a value based on the information about the test object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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providing scanning interferometry data for a test object, the data comprising intensity values for each of multiple scan positions for each of different spatial locations of the test object, the intensity values for each spatial location defining an interference signal for the spatial location, the intensity values for a common scan position defining a data set for that scan position; determining information about the test object by transforming at least some of the interference signals into a frequency domain with respect to initial values for the scan positions; determining, based on the scanning interferometry data and the information about the test object, a scan value for each of at least some of the scan positions; and outputting a value based on the scan value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A system, comprising:
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an interferometer configured to provide scanning interferometry data for a test object, the data comprising intensity values for each of multiple scan positions for each of different spatial locations of the test object, the intensity values for each spatial location defining an interference signal for the spatial location, the intensity values for a common scan position defining a data set for that scan position; a processor configured to; transform at least some of the interference signals into a frequency domain with respect to initial values for the scan positions; and determine, based on at least some of the transformed interference signals, a respective scan value for each of at least some of the scan positions.
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18. A system, comprising:
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an interferometer configured to provide scanning interferometry data for a test object, the data comprising intensity values for each of multiple scan positions for each of different spatial locations of the test object, the intensity values for each spatial location defining an interference signal for the spatial location, the intensity values for a common scan position defining a data set for that scan position; and a processor configured to; determine scan values based on the scanning interferometry data and an initial estimate of values for the scan positions, each scan value corresponding to a scan position; transform the interference signals for each of different spatial locations into a spatial frequency domain with respect to scan values; wherein increments between the scan values are non-uniform. - View Dependent Claims (19, 20, 21)
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Specification