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Antonio Nafarrate Phones & Addresses

  • Walnut Creek, CA
  • Dublin, CA
  • San Ramon, CA
  • Lincoln, CA
  • San Jose, CA
  • Milpitas, CA
  • Palo Alto, CA

Publications

Us Patents

Fiber Optical Monitor For Detecting Motion Based On Changes In Speckle Patterns

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US Patent:
52123790, May 18, 1993
Filed:
Dec 6, 1991
Appl. No.:
7/802868
Inventors:
Antonio B. Nafarrate - San Jose CA
Eric G. Rawson - Saratoga CA
Assignee:
Alamed Corporation - Portola Valley CA
International Classification:
H01J 4014
US Classification:
25022714
Abstract:
A motion monitor using coherent or partially coherent light passing through an optical fiber which is in contact or close to an object whose motion is to be monitored. An optical speckle pattern is formed near the output of the optical fiber which pattern changes as the fiber moves in response to the motion of the object being monitored. An optical detector monitors all or a part of the speckle pattern and electronically processes the optical detector's electrical output signals to derive information on the status of the object being monitored.

Flying Spot Scanning System With Virtual Scanners

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US Patent:
39625389, Jun 8, 1976
Filed:
Nov 21, 1974
Appl. No.:
5/525695
Inventors:
Antonio B. Nafarrate - Milpitas CA
Assignee:
Xerox Corporation - Stamford CT
International Classification:
H04N 104
US Classification:
178 76
Abstract:
A flying spot scanning system is provided which uses directed light from a scanning element, which directed light is reflected through a symmetrical arrangement of prisms for scanning across a medium with a planar object surface. Virtual scanners provide a segmented focal plane whereby the effective scan angle of the system is reduced.

Fiber Optical Monitor For Detecting Normal Breathing And Heartbeat Motion Based On Changes In Speckle Patterns

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US Patent:
52910130, Mar 1, 1994
Filed:
Nov 13, 1992
Appl. No.:
7/975853
Inventors:
Antonio B. Nafarrate - San Jose CA
Eric G. Rawson - Saratoga CA
Assignee:
Alamed Corporation - Portola Valley CA
International Classification:
H01J 4014
US Classification:
25022714
Abstract:
A fiber optic body motion monitor in which light is transmitted through an optical fiber waveguide physically coupled to a body being monitored, and modal noise at the output of the optical fiber waveguide is applied to a photodetector filtered, rectified and analyzed to detect breathing and heartbeats. Detection of breathing is performed by low-pass filtering the rectified and filtered signal, and adaptive thresholding of the low-pass filtered signal. A similar but separate technique is used to detect heartbeats. In one embodiment, reliability of detection is enhanced by reducing the number of speckles of light applied to the photodetector to approximately 50%, thereby to maximize modal noise current. In another embodiment the photodetector has two halves separately illuminated by approximately two-thirds of the light from the optical fiber waveguide. Outputs of the photodetector halves are applied to the positive and negative inputs of an operational amplifier, whereby common mode noise is eliminated and modal noise current and therefore sensitivity of modal noise detection increased.
Antonio B Nafarrate from Walnut Creek, CA, age ~84 Get Report