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We explore the possibility of using free (as opposed to driven) oscillationsto verify wire tension in large, open-frame multiwire planes. Usingfinite-element simulation we predict the signal when two wires are set inmotion by applying and holding a DC voltage between them (electrostaticexcitation). The resulting current signal is marginal. However, the programrelates voltage, oscillation amplitude and signal, and it is easy to get enoughamplitude (of order microns) by gently tapping the wire frame. We perform anend-to-end experimental test. Four 1.5m wires, at various tensions around 5N,are mounted in an aluminum channel. They are connected to a low-noise, balancedcurrent-to-voltage preamp designed for good common-mode rejection. The 150Vbias, from 9V batteries in series, is built into the preamp. Data are takenwith a Tektronix 1202B scope, stored on a USB flash drive, and transferred to alaptop computer for analysis. Ten measurements, each with 2500 samples spanning1s, are taken for each of the three wire pairs. The wires are excited bytapping the frame with a small mallet. Because the wire tensions are different,the waveforms exhibit beats. The data are analyzed by a program whichdecomposes the waveform step by step to extract the base and beat frequenciesand thereby, two resonant frequencies per wire pair. Finally, those frequenciesare disambiguated to obtain the frequency for each wire, which is thenconverted to a tension. The four tensions are then found mechanically bymeasuring the g/mm required to deflect each wire at its midpoint. The twovalues of tension agree well. We conclude that the method verifies tension toapproximately 2% (1 sigma) in a little over 1s for 1.5m wires, and would befaster for shorter wires.

Rapid measurement of tension in multi-wire arrays using free damped oscillations