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Class Information
Number: 324/176
Name: Electricity: measuring and testing > Electrical speed measuring > Including object displacement varied variable circuit impedance
Description: Subject matter in which the means for producing the electric speed signal includes a variable circuit element whose impedance varies as a function of the position of the object in the path along which its speed is being measured.

Patents under this class:

Patent Number Title Of Patent Date Issued
8575944 Foreign object detection in inductive coupled devices Nov. 5, 2013
8549922 Motion detection using capacitor having different work function materials Oct. 8, 2013
8531182 Control system and method for providing position measurement with redundancy for safety checking Sep. 10, 2013
8169214 Angular position sensor May. 1, 2012
8138771 Touch controller with read-out line Mar. 20, 2012
7855550 Velocity-detecting device Dec. 21, 2010
7576532 Motion transducer for motion related to the direction of the axis of an eddy-current displacement sensor Aug. 18, 2009
7345471 Device and method for detecting the position and the velocity of a test object Mar. 18, 2008
6933735 Ramp arrangement and method for measuring the position of an actuator in a rotating media data storage device Aug. 23, 2005
6519538 Method for predicting stability characteristics of power supplies Feb. 11, 2003
5712574 Apparatus for position detection and verification thereof using pulse patterns having sequentially unique properties Jan. 27, 1998
5537322 System and method for determining a gradient speed of a shaft driven by an internal combustion engine Jul. 16, 1996
5459397 Speed sensor for rotatable shaft using shaft mounted antenna Oct. 17, 1995
5438261 Inductive sensing apparatus for a hydraulic cylinder Aug. 1, 1995
5210488 Projectile velocity measurement system and method May. 11, 1993
4963829 Shaft rotation analyzer using variable capacitance transducer maintained at a constant voltage Oct. 16, 1990
4732034 Tachometer kit with alternator pick up Mar. 22, 1988
4715009 Device for determining angular position of a rotating part Dec. 22, 1987
4455555 Control transducer Jun. 19, 1984
4445087 Process and an apparatus for measuring the angular velocity of a rotating member Apr. 24, 1984
4391250 System for detecting the operation of the throttle valve Jul. 5, 1983
4355364 Velocity sensing system Oct. 19, 1982
4255976 Apparatus and method for measuring the velocity of a moving dielectric material Mar. 17, 1981
4214483 Apparatus for measuring angular speed Jul. 29, 1980
4203074 Potentiometer circuit May. 13, 1980

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