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Remotely Powered Measurement Systems

IP.com Disclosure Number: IPCOM000073634D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Barr, ER: AUTHOR

Abstract

In measurement systems, it is often desirable to measure in extremely small or relatively inaccessible volumes. In such situations, it is still necessary to transfer power to the remote measurement circuits as well as sense the condition being measured. In many instances, the number of electrical wires leading to and from the remote measurement circuits have to be minimized, such as using a single conductor. For example, the remote measurement circuits may be in a moving member requiring a slip ring connection between a control console and the measurement circuits. For noise reduction purposes, it is highly desirable that the number of slip rings be kept to a minimum.

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Remotely Powered Measurement Systems

In measurement systems, it is often desirable to measure in extremely small or relatively inaccessible volumes. In such situations, it is still necessary to transfer power to the remote measurement circuits as well as sense the condition being measured. In many instances, the number of electrical wires leading to and from the remote measurement circuits have to be minimized, such as using a single conductor. For example, the remote measurement circuits may be in a moving member requiring a slip ring connection between a control console and the measurement circuits. For noise reduction purposes, it is highly desirable that the number of slip rings be kept to a minimum.

Console circuits 10 supply sine-wave power over coaxial conductor 11 to power remote measurement circuits 12. Circuits 13 are responsive of a selected condition to vary Die AC load. Circuits 10 detect changes in the power supplied over conductor 11. An indicating signal is generated and supplied over line 13 indicative of the condition being measured.

Sine-wave power source 15 supplies pure sine-wave power through measurement resistor 16 to circuits 12. Detector 17 is responsive to voltage drop changes across resistor 16 to supply a signal over line 13 indicative of the measurements being made by circuits 12.

In circuits 12, power is supplied through transformer 20 to AC excite AC measurement bridge 21. In this embodiment, strain gauges 22 and 23 form two legs of the measurement bridge. Any bridge imbalance results in a signal being supplied through amplifier 24, thence to comparator 25. Reference sour...