Optical design for laser encoder resolution extension and angular measurement

Title: Optical design for laser encoder resolution extension and angular measurement

Abstract

A laser Doppler encoder includes a set of prisms mounted on a fixed base along with an additional prism, an end retroreflector and a laser/detector and a second set of prisms mounted on a moving/rotating base. The laser/detector generates a laser beam that is transmitted through the sets of prisms on the fixed and moving bases as well as the additional prism and the end retroreflector until the laser beam finally reaches a heterodyning detector that is housed coaxially inside the laser/detector. The laser beam is a frequency-stabilized laser beam such that the laser beam that is reflected back to the heterodyning detector is frequency-shifted by the movement of the moving base relative to the fixed base so that the amount of movement (either rotational or linear) of the moving base can be accurately determined. Moreover, the end retroreflector enables the laser Doppler encoder to be readily self-aligned such that the alignment time is substantially reduced and the three-dimensional optical path configuration results in a compact and integrated optical design which optimizes the system's anti-vibration performance. The laser Doppler encoder can be used in conjunction with a high energy resolution monochromator for accurately determining the rotational movement of an armmore »« less

Inventors:: Shu, Deming

Issue Date:: 1999-04-20

Research Org.:: Univ. of Chicago, IL (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1531822

Patent Number(s):: 5896200

Application Number:: 08/902,115

Assignee:: The University of Chicago (Chicago, IL)

Patent Classifications (CPCs):: G - PHYSICS G01 - MEASURING G01B - MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS

G - PHYSICS G01 - MEASURING G01S - RADIO DIRECTION-FINDING

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G - PHYSICS G01 - MEASURING G01B - MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS
G01B11/272 - {using photoelectric detection means}

G - PHYSICS G01 - MEASURING G01S - RADIO DIRECTION-FINDING
G01S17/58 - Velocity or trajectory determination systems

G - PHYSICS G01 - MEASURING G01B - MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS
G01B11/026 - {by measuring distance between sensor and object

G - PHYSICS G01 - MEASURING G01S - RADIO DIRECTION-FINDING
G01S7/481 - Constructional features, e.g. arrangements of optical elements

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DOE Contract Number:: W-31-109-ENG-38

Resource Type:: Patent

Resource Relation:: Patent File Date: 1997-07-29

Country of Publication:: United States

Language:: English

Citation Formats


                    Shu, Deming. Optical design for laser encoder resolution extension and angular measurement.  United States: N. p., 1999. 
        Web.

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                    Shu, Deming. Optical design for laser encoder resolution extension and angular measurement.  United States.

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                    Shu, Deming. Tue .  
        "Optical design for laser encoder resolution extension and angular measurement".  United States.  https://www.osti.gov/servlets/purl/1531822.

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@article{osti_1531822,

  title        = {Optical design for laser encoder resolution extension and angular measurement},

  author       = {Shu, Deming},

  abstractNote = {A laser Doppler encoder includes a set of prisms mounted on a fixed base along with an additional prism, an end retroreflector and a laser/detector and a second set of prisms mounted on a moving/rotating base. The laser/detector generates a laser beam that is transmitted through the sets of prisms on the fixed and moving bases as well as the additional prism and the end retroreflector until the laser beam finally reaches a heterodyning detector that is housed coaxially inside the laser/detector. The laser beam is a frequency-stabilized laser beam such that the laser beam that is reflected back to the heterodyning detector is frequency-shifted by the movement of the moving base relative to the fixed base so that the amount of movement (either rotational or linear) of the moving base can be accurately determined. Moreover, the end retroreflector enables the laser Doppler encoder to be readily self-aligned such that the alignment time is substantially reduced and the three-dimensional optical path configuration results in a compact and integrated optical design which optimizes the system's anti-vibration performance. The laser Doppler encoder can be used in conjunction with a high energy resolution monochromator for accurately determining the rotational movement of an arm in the monochromator or can be used in conjunction with a closed looped motion controller for providing feedback on the rotational displacement of the arm of the monochromator so that the arm can be accurately positioned.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1999},

  month        = {4}

}

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Works referenced in this record:

Method and apparatus for improving the measuring accuracy of a micrometer
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Schaffer, Michael J.
US Patent Document 4,922,307
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Works referencing / citing this record:

Redundantly constrained laminar structure as weak-link mechanisms
patent, August 2003

Shu, Deming; Toellner, Thomas S.; Alp, E. Ercan
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Redundantly constrained laminar structure as weak-link mechanisms
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Optical device and method for measuring the rotation of an object
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Bach, Olivier
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Optical design for laser encoder resolution extension with three-dimensional motion decoupling
patent, November 2004

Shu, Deming
US Patent Document 6,822,733
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Inertial sensor misalignment and compensation
patent, November 2011

Grossman, Owen D.; Vallot, Lawrence C.
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Inertial sensor misalignment and compensation
patent, November 2011

Grossman, Owen D.; Vallot, Lawrence C.
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Mechanical design of multiple zone plates precision alignment apparatus for hard X-ray focusing in twenty-nanometer scale
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Mechanical design of laminar weak-link rotary mechanisms with ten-degree-level travel range and ten-nanoradian-level positioning resolution
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Shu, Deming; Maser, Jorg M.
US Patent Document 8,089,199
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Inverse corner cube for non-intrusive three axis vibration measurement
patent, December 2003

Hadden, George D.
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Precision mechanical structure of an ultra-high-resolution spectrometer for inelastic X-ray scattering instrument
patent, April 2015

Shu, Deming; Shvydko, Yury; Stoupin, Stanislav A.
US Patent Document 9,008,272
URL: http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=9008272

Mechanical design of deformation compensated flexural pivots structured for linear nanopositioning stages
patent, February 2015

Shu, Deming; Kearney, Steven P.; Preissner, Curt A.
US Patent Document 8,957,567
URL: http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=8957567

Optomechanical structure for a multifunctional hard x-ray nanoprobe instrument
patent, February 2008

Shu, Deming; Maser, Jorg M.; Lai, Barry
US Patent Document 7,331,714
URL: http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=7331714

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Title: Optical design for laser encoder resolution extension and angular measurement

Abstract

Citation Formats

Method and apparatus for improving the measuring accuracy of a micrometer patent, May 1990

Redundantly constrained laminar structure as weak-link mechanisms patent, August 2003

Portable music player with pay per play usage and method for purchase of credits for usage patent, December 2005

Redundantly constrained laminar structure as weak-link mechanisms patent, January 2006

Optical device and method for measuring the rotation of an object patent, August 2013

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Inertial sensor misalignment and compensation patent, November 2011

Inertial sensor misalignment and compensation patent, November 2011

Mechanical design of multiple zone plates precision alignment apparatus for hard X-ray focusing in twenty-nanometer scale patent, April 2017

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Inverse corner cube for non-intrusive three axis vibration measurement patent, December 2003

Precision mechanical structure of an ultra-high-resolution spectrometer for inelastic X-ray scattering instrument patent, April 2015

Mechanical design of deformation compensated flexural pivots structured for linear nanopositioning stages patent, February 2015

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patent, May 1990

Redundantly constrained laminar structure as weak-link mechanisms
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Inertial sensor misalignment and compensation
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Mechanical design of multiple zone plates precision alignment apparatus for hard X-ray focusing in twenty-nanometer scale
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Mechanical design of laminar weak-link rotary mechanisms with ten-degree-level travel range and ten-nanoradian-level positioning resolution
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