Communications – electrical: acoustic wave systems and devices – Distance or direction finding
Patent
1984-03-23
1991-07-09
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
181106, 175 45, 367 25, G01V 140
Patent
active
050311581
ABSTRACT:
Method and apparatus for determining the precise location of a drill bit tip relative to specified locations on a workpiece in precision automatic machining operations. Elastic waves are induced in a drill shank, guided through the shank to the drill bit tip and couple to the surrounding workpiece material in contact with the tip of the drill bit. Elastic wave sensors are disposed in elastic wave transmitting relation with the workpiece to detect the induced elastic waves. The precise location of the drill bit tip is determined by computing the propagation time of elastic waves from the drill bit tip to each of the respective sensors. In one embodiment, elastic waves are induced with contactless electromagnetic coupling via a magnetostrictive transduction technique. Other techniques for inducing elastic waves in a drill bit are described.
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"Magnetostriction Phenomena", Williams, W. D., general Electric Review, Mar. 1942.
Lobo Ian J.
The Charles Stark Draper Laboratory Inc.
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