Two-wire constant current powered transducer
First Claim
1. A circuit for processing a vibration signal in a vibration monitoring device comprising in combination:
- a constant current source providing power;
power supply lines operatively coupled to said constant current source;
a transistor operatively coupled to said power supply lines;
a high gain op-amp having an inverting input terminal, a noninverting input terminal, an output terminal and power supply terminals;
said output terminal of said high gain op-amp operatively coupled to said transistor;
a voltage signal into one of said input terminals of said high gain op-amp;
whereby an output from said output terminal of said high gain op-amp causes an impedance change of said transistor wherein said impedance change along with an amount of said constant current through said transistor provide an output signal voltage to said power supply lines wherein said output signal voltage corresponds to the vibration signal of a machine being monitored.
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Accused Products
Abstract
A two-wire constant current powered transducer (10) for detecting, integrating and transmitting an acceleration signal (50) received from a piezoelectric crystal (12). The crystal is operatively coupled to rotating machinery (M) such that rotating anomalies correlative of wear or potential failure can be detected early enough for preventative maintenance. The transducer (10) includes two stages (30, 40). The first stage (30) is an integrator which integrates the acceleration to velocity. The second stage (40) is a gain stage. The gain stage operates with a PNP transistor emitter follower to control the output DC bias level and route the integrated acceleration signal back to the control system.
17 Citations
17 Claims
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1. A circuit for processing a vibration signal in a vibration monitoring device comprising in combination:
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a constant current source providing power; power supply lines operatively coupled to said constant current source; a transistor operatively coupled to said power supply lines; a high gain op-amp having an inverting input terminal, a noninverting input terminal, an output terminal and power supply terminals; said output terminal of said high gain op-amp operatively coupled to said transistor; a voltage signal into one of said input terminals of said high gain op-amp; whereby an output from said output terminal of said high gain op-amp causes an impedance change of said transistor wherein said impedance change along with an amount of said constant current through said transistor provide an output signal voltage to said power supply lines wherein said output signal voltage corresponds to the vibration signal of a machine being monitored. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification