Strain measurement using vibrating-wire gages

The determination of deformations by measuring the consequent change in the natural frequency of transverse vibration of a tensioned wire is well known in principle. Sophisticated gages making use of this method are commercially available but the application of the technique to field measurements involves the solving of certain practical difficulties. The development and use of a simple type of vibrating-wire strain gage, together with the necessary ancillary equipment, is described.