![]() It is also possible to use a gauge wire not mounted between two mechanical points to measure the voltage, but this technique has its limitations. "Calibrating" is an art in itself, absolutely essential to obtain accurate and stable deformation measurements. The task of attaching strain gauges to test specimens may seem very simple, but it is not. The name "bonding gauge" is given to strain gauges that stick to a larger structure under stress (called the test sample). ![]() The last form of deformation gauge is depicted in the previous illustration. Alternatively, the conductors of the voltage meter may be thin strips of metal film deposited on a non-conducting substrate material called the carrier. The conductors of a strain gauge are very thin: if they are made of round wire, about 1/1000 inches in diameter. The device is still used in many electronic circuits, mainly as the main sensor element for sensors such as torque sensors, pressure sensors, load cells and so on. The device was invented in the year 1938 by Edward E. A deformation gauge is a device that is used to measure the deformation occurring in an object.
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