Dual laser high precision interferometer

Details Dual laser high precision interferometer Dual laser high precision interferometer

2007-11-06

2007-11-06

Connolly, Patrick (Department: 2877)

Optics: measuring and testing

By light interference

For dimensional measurement

Reexamination Certificate

active

11193437

ABSTRACT:
An absolute distance measuring device based on laser interferometry may combine coarse, intermediate, and highest resolution measurement techniques to find the absolute distance to a sample surface with high resolution. The device may provide at least two laser wavelengths simultaneously, to allow reduction or elimination of certain common-mode error components, including dynamic error components. The device may scan at least one of the laser wavelengths over a relatively narrow range and may use quadrature detectors to provide enough signal data to allow certain self-corrections to be performed on the resulting scanned signals and measurements. A novel tunable laser and/or quadrature detector may provide advantages in combination with the device.

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