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Measurement of Dynamic Tension in a Moving Foil Web

IP.com Disclosure Number: IPCOM000077334D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Durbeck, RC: AUTHOR [+3]

Abstract

The measurement of dynamic tension in a moving tape or foil web has long been a problem, due to the difficulty of entering the moving system with sensitive instrumentation. The method described below allows a means of measurement using a proximity probe.

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Measurement of Dynamic Tension in a Moving Foil Web

The measurement of dynamic tension in a moving tape or foil web has long been a problem, due to the difficulty of entering the moving system with sensitive instrumentation. The method described below allows a means of measurement using a proximity probe.

It is known that there is a physical relationship between the tension in a tape system and the height at which that tape flies above the surface of a pressurized air bearing in the system path.

The capacitance probe distance meter is capable of measuring change in tape height to an accuracy of 2-3 mu'', with a frequency response of 15-30 MHz. The probe does not contact the tape. By using a properly calibrated probe, tape tension is measured as an analog of tape height for any linear velocity.

The apparatus is shown in Fig. 1. The curves shown in Fig. 2 are the results of tests conducted with this apparatus. They represent the measured relationship between flying height and tape tension over a range of bearing pressures. This system makes it possible to measure dynamic tension variations at very high frequency without contacting the tape.

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