NDLI: Phase length optical phase-locked-loop sensor

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Phase length optical phase-locked-loop sensor

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1988
Description	The invention is a device that provides a high resolution measurement of the change in optical phase length from the device optical system source to an optical reflector. The invention consists of a optical phase locked loop that uses a laser beam as a carrier of an intensity modulated energy source. The novelty of the invention appears to lie in the overall combination of elements which provide high resolution without loss of wide dynamic range. The invention does not depend on coherent reflection from a target, and thus can measure targets that do not have special preparation or corner reflectors. The use of carrier modulation achieves high resolution without the problems of high speed pulse duration systems. Thus the invention has the advantages of simplicity, low cost, and small size without sacrificing resolution.
File Size	620062
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19880015918
Archival Resource Key	ark:/13960/t08w89m3h
Language	English
Publisher Date	1988-02-11
Access Restriction	Open
Subject Keyword	Optics Laser Outputs Optical Paths High Resolution Phase Modulation Wavelengths Phase Locked Systems Optical Reflection Loops Optical Measuring Instruments Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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