Detectable element and sensor

Details Detectable element and sensor Detectable element and sensor

1982-07-26

1985-07-02

Myracle, Jerry W.

Communications: electrical

Condition responsive indicating system

Specific condition

73654, G08B 1324

Patent

active

045271534

ABSTRACT:
A detectable element is attached to an object for detecting the presence or passage of the object and comprises a capsule and a permanent magnet rotatably and vibratably mounted in the capsule. When the detectable element enters an alternating magnetic field, the permanent magnet rotates or vibrates within the capsule to thereby produce a magnetic wave or an audible sound, which is picked up to detect the detectable element.

REFERENCES:
patent: 3754225 (1973-08-01), Gleason

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