Self-contained sensor
First Claim
Patent Images
1. A self-contained sensor, comprising:
- a transducer for converting a physical stimulus to an equivalent electrical signal;
a voltage controlled oscillator having a resistive-capacitive twin-T network in its feedback path, including a field effect transistor operated as a voltage controlled resistor in the middle leg resistor of said twin-T network;
circuit means for applying the equivalent electrical signal to said oscillator for powering it including means for rectifying and filtering the signal;
circuit means for frequency modulating the output of said oscillator by the equivalent electrical signal by applying it to said field effect transistor, including means for rectifying and filtering the signal, andcircuit means for transmitting the modulated output of said oscillator to a remote location.
0 Assignments
0 Petitions
Accused Products
Abstract
A sensor for remotely monitoring a physical stimulus is rendered completely self-contained by utilizing the equivalent electrical signal transduced from the stimulus to power an A. C. signal source as well as to modulate the A. C. signal generated therefrom before transmitting the modulated A. C. signal to the remote monitoring location.
-
Citations
1 Claim
-
1. A self-contained sensor, comprising:
-
a transducer for converting a physical stimulus to an equivalent electrical signal; a voltage controlled oscillator having a resistive-capacitive twin-T network in its feedback path, including a field effect transistor operated as a voltage controlled resistor in the middle leg resistor of said twin-T network; circuit means for applying the equivalent electrical signal to said oscillator for powering it including means for rectifying and filtering the signal; circuit means for frequency modulating the output of said oscillator by the equivalent electrical signal by applying it to said field effect transistor, including means for rectifying and filtering the signal, and circuit means for transmitting the modulated output of said oscillator to a remote location.
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeRockwell International Corporation
-
Original AssigneeRockwell International Corporation
-
InventorsRobinson, Roland L.
-
Primary Examiner(s)Habecker, Thomas B.
-
Application NumberUS05/614,578Time in Patent Office474 DaysField of Search340/191, 340/189 M, 340/210, 310/6, 310/8.1US Class Current340/870.18CPC Class CodesE21C 35/18 Mining picks; Holders there...E21C 39/00 Devices for testing in situ...G01L 1/16 using properties of piezoel...
