DAVID K NERGAARD
Radio and Television Technicians in Littleton, MA
License number
Massachusetts 8993
Issued Date
Mar 13, 1985
Expiration Date
Dec 31, 1988
Type
Master Technician
Address
Address
Littleton, MA 01460
Professional information
Remote Optical Sensing Device And Method
US Patent:
4939482, Jul 3, 1990
Filed:
Jun 24, 1987
Appl. No.:
7/066210
Inventors:
David K. Nergaard - Littleton MA
Richard Scarlet - Boxborough MA
Seymour Goldberg - Saugus MA
Richard Scarlet - Boxborough MA
Seymour Goldberg - Saugus MA
Assignee:
EG&G, Inc. - Wellesley MA
International Classification:
H04B 900
US Classification:
455613
Abstract:
A remote sensing system including a control module coupled to a remote device module via an optical fiber is disclosed. The device module includes circuitry for detecting changes in physical parameters and for transmitting data relating thereto back to the control module in serial form via the optical fiber. Power for the circuitry within the device module is obtained from a photodiode which receives light from the control module via the optical fiber and no power multiplication is utilized except which the remote module is transmitting serial data back to the control module. Data signals are also provided from which monitoring of the integrity of the device module and connections thereto can be obtained.
Sensor
US Patent:
6946650, Sep 20, 2005
Filed:
Feb 27, 2003
Appl. No.:
10/375449
Inventors:
Dana R. Yoerger - North Falmouth MA, US
David K. Nergaard - Littleton MA, US
Albert M. Bradley - North Falmouth MA, US
David K. Nergaard - Littleton MA, US
Albert M. Bradley - North Falmouth MA, US
Assignee:
Independence Technology, L.L.C. - Warren NJ
International Classification:
G01D005/34
US Classification:
25023118, 25023114, 250226, 2505781, 356419, 356420
Abstract:
The relative position of two members is determined based upon a detected relative intensities of first and second colors of light. The intensity balance associated with relative occlusion of first and second color filter portions on one member by a mask on the other member. An exemplary use is in rotational position sensing within a limited rotation range. With a given compliance between the two members, the position sensing can be used as a proxy for torque sensing.