Electricity: measuring and testing – Magnetic – Displacement
Patent
1985-05-02
1987-11-24
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
33125W, 340365L, 367127, G01B 714, G01H 500
Patent
active
047092106
ABSTRACT:
A new form of proximity sensor is described which enables sensing of magnetic and/or metallic objects over an extended region of space. The time-varying magnetic field necessary for proximity sensing is provided by a strain wave propagating at acoustic velocity in a waveguide composed of magnetized magnetostrictive material. The propagating strain wave carries with it a disturbance in the magnetic field in the region of the waveguide. A single, elongated sensing coil is located in the same plane as the acoustic waveguide and senses changes in the flux passing through the coil when magnetic and/or metallic objects or targets are present near the waveguide. The spatial location of the targets along the length of the proximity sensor can be determined by measuring the time interval from the initial application of the strain wave until the signal corresponding to the target is induced in the sensing coil. Multiple objects can be sensed by measuring the time interval for each signal. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
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