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Ralph A Kelliher

age ~74

from Acton, ME

Also known as:
  • Ralph A Kellher
Phone and address:
870 Route 109, Acton, ME 04001
(207)8501195

Ralph Kelliher Phones & Addresses

  • 870 Route 109, Acton, ME 04001 • (207)8501195
  • Andover, ME
  • Greenwood, ME
  • Wayland, MA
  • Newton, MA

Us Patents

  • Reference Point Talbot Encoder

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  • US Patent:
    20030047674, Mar 13, 2003
  • Filed:
    Aug 13, 2002
  • Appl. No.:
    10/217756
  • Inventors:
    William Thornburn - Whitinsville MA, US
    Norman Tobey - Bedford MA, US
    Melvin Teare - Ashland MA, US
    Douglas Klingbeil - Niwot CO, US
    Ralph Kelliher - Newton MA, US
  • Assignee:
    MicroE Systems, Inc. - Natick MA
  • International Classification:
    G01D005/34
  • US Classification:
    250/231130
  • Abstract:
    The disclosed optical encoder includes a scale and a sensor head. The scale includes an optical grating and an optical element. The sensor head includes a light source, a detector array, and an index detector all of which are disposed on a substrate. The scale is disposed opposite the sensor head and is disposed for movement relative to the sensor head. The distance between the scale and the sensor head is selected so that the detector array lies near a talbot imaging plane. The light source emits a diverging beam of light, which is directed towards the scale. Light from the diverging beam of light is diffracted by the grating towards the detector array. Light from the diverging beam of light is diffracted by the optical element towards the index detector. The detector array provides a measurement of the position of the sensor head relative to the scale. The index detector provides a reference measurement of the position of the sensor head relative to the scale.
Name / Title
Company / Classification
Phones & Addresses
Ralph A. Kelliher
President
Neolith Corporation
Business Services at Non-Commercial Site
25 Chestnut Ter, Newton, MA 02459

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Ralph Kelliher Photo 1

Ralph Kelliher

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Friends:
Ann Goodwin, Julia Kelliher, Willow Hein, Merrie Nydam, David Kelliher

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