Career records & work history
Medicine Doctors
Gregory C Hildebrand, 62Grand Rapids, MI
Gregory Hildebrand Phones & Addresses
Grand Rapids, MI
1001 Hayer Cir, Rio Linda, CA 95673 916-9221617 916-9921617
Lansing, MI
Indianapolis, IN
Le Mars, IA
Middletown, CT
Littleton, CO
La Mesa, CA
Mentions for Gregory C Hildebrand
Publications & IP owners
Us Patents
Passive Transmitting Sensor
US Patent:
5227798, Jul 13, 1993
Filed:
Jun 24, 1992
Appl. No.:
7/904624
Inventors:
Gregory C. Hildebrand - Rio Linda CA
Assignee:
The United States of America as represented by the Secretary of the Air
Force - Washington DC
Force - Washington DC
International Classification:
G01S 1380
US Classification:
342 51
Abstract:
The disclosed system comprises a receiver that is inductively coupled to one or more passive transmitters by means of a receiving inductor. The receiver comprises a sweep signal source which is coupled equally to the receiving inductor and a reference inductor. The receiving inductor is coupled to a passive transmitter which includes an L-R-C circuit comprised of a transmitting inductor, a temperature-dependent capacitor, and a resistor that may be variable or fixed, depending upon the application. As the sweep signal source passes through the resonant frequency of the passive transmitter, the passive transmitter forms a low impedance load magnetically coupled to the receiving inductor by means of the near or induction electromagnetic field produced by the inductor. Changes in the resonant frequency are used to determine temperature variation. Changes in the peak voltages are a determinant of resistor variation resulting from changes in pressure or strain, or they are a determinant of changes in proximity of the passive transmitter to the receiver, or the resistor variation resulting from changes in pressure or strain.
System And Method Of Embedding Optical Fibers In Honeycomb Panels
US Patent:
5299271, Mar 29, 1994
Filed:
Feb 26, 1993
Appl. No.:
8/033082
Inventors:
Gregory C. Hildebrand - Rio Linda CA
Assignee:
The United States of America as represented by the Secretary of the Air
Force - Washington DC
Force - Washington DC
International Classification:
G02B 600
G02B 642
G02B 642
US Classification:
385 12
Abstract:
For the purpose on monitoring the condition in the interior of a closed metallic honeycomb panel, an optical fiber is embedded therein. An optical connector, secured within a groove has one end exposed to a source of external light, while the optical fibers are connected to the other end of the connector. In the example disclosed, the end of the optical fiber within the structure is coated with a sensor material subject to the same condition (corrosion) taking place within the structure. The reflectivity of the coating from a source of light applied through an optical connector is a measure of the condition.
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