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Design considerations and validation of the MSTAR absolute metrology system

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dc.contributor.author Peters, Robert D.
dc.contributor.author Lay, Oliver P.
dc.contributor.author Dubovitsky, Serge
dc.contributor.author Burger, Johan P.
dc.contributor.author Jeganathan, Muthu
dc.date.accessioned 2006-04-12T18:20:42Z
dc.date.available 2006-04-12T18:20:42Z
dc.date.issued 2004-08-02
dc.identifier.citation SPIE Optical Science and Technology 49th Annual Meeting, Denver, Colorado, August 2-6, 2004. en
dc.identifier.clearanceno 04-1488
dc.identifier.uri http://hdl.handle.net/2014/39099
dc.description.abstract Absolute metrology measures the actual distance between two optical fiducials. A number of methods have been employed, including pulsed time-of-flight, intensity-modulated optical beam, and two-color interferometry. The rms accuracy is currently limited to -5 microns. Resolving the integer number of wavelengths requires a 1-sigma range accuracy of -0.1 microns. Closing this gap has a large pay-off the range (length measurement) accuracy can be increased substantially using the unambiguous optical phase. The MSTAR sensor (Modulation Sideband Technology for Absolute Ranging) is a new system for measuring absolute distance, capable of resolving the integer cycle ambiguity of standard interferometers, and making it possible to measure distance with sub-nanometer accuracy. In this paper, we present recent experiments that use dispersed white light interferometry to independently validate the zero-point of the system. We also describe progress towards reducing the size of optics, and stabilizing the laser wavelength for operation over larger target ranges. MSTAR is a general-purpose tool for conveniently measuring length with much greater accuracy than was previously possible, and has a wide range of possible applications. en
dc.description.sponsorship NASA/JPL en
dc.format.extent 945731 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004. en
dc.subject absolute metrology en
dc.subject distance measurement en
dc.title Design considerations and validation of the MSTAR absolute metrology system en
dc.type Preprint en


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