Measuring and testing – Vibration – Sensing apparatus
Patent
1984-12-31
1986-11-04
Kreitman, Stephen A.
Measuring and testing
Vibration
Sensing apparatus
73 1DV, G01H 100
Patent
active
046204466
ABSTRACT:
An improved vibration-responsive device is provided for monitoring the condition of a selected apparatus. The improved device is adapted to be mounted to the selected apparatus and comprises a vibration-responsive transducer capable of generating an electrical output signal when the transducer is subjected to vibrations or shock, an auxiliary transducer capable of producing mechanical vibrations in response to an input electrical signal, and means mounting said auxiliary transducer in force-transmitting relation to the vibration-responsive transducer. The device is adapted to be connected to (1) a monitoring system for monitoring the electrical output of the vibration-responsive transducer (the "primary transducer") and (2) means for selectively energizing the auxiliary transducer with an externally generated test signal. When the auxiliary transducer is energized by the test signal, it will cause the associated primary transducer to vibrate. That in turn should cause a corresponding change in the signal output of the primary transducer if the latter is operating correctly. If the signal output of the primary transducer does not change when the auxiliary transducer is energized by the test signal, the interrogating party may validly conclude that the primary transducer is malfunctioning. The invention contemplates several ways of arranging the auxiliary transducer in force-transmitting relation to the primary transducer. Preferably the auxiliary transducer is disposed between the primary transducer and its mounting base. Alternatively the auxiliary transducer is clamped between the mounting base of the primary transducer and the surface to which the base is mounted. In an alternative embodiment, the primary and auxiliary transducers share common piezoelectric elements.
REFERENCES:
patent: 3076343 (1963-02-01), Dumas et al.
patent: 3120622 (1964-02-01), Dranetz et al.
patent: 3566163 (1971-02-01), Fischer et al.
patent: 4441044 (1984-04-01), Ruckenbauer et al.
patent: 4503351 (1985-03-01), Sonderegger et al.
Jensen Jorgen
Michel Gregory C.
Bruel & Kjaer Instruments, Inc.
Kreitman Stephen A.
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