Page 889 - Basic Electrical Engineering

Figure 12.10 Strain gauges of different types and shapes

Strain gauges are extensively used for the measurement of strain and

associated stress in experimental stress analysis. Strain gauges are pasted on
the surface of the structures or bodies to sense strain under applied load. An

electrical output signal proportional to the strain can be obtained from the
transducer when an input voltage is provided. Measurement of stress
occurring under varied environmental conditions can be measured using

strain gauge. For example, the strain in an aircraft body structure can be
measured by using the electrical signal generated by the strain gauges and by

transmitting the signal to ground instruments.

12.9 THERMISTORS

Thermistors are temperature-sensitive resistors which are also called thermal
resistors. They are made of materials which have a very high negative