![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhGMypsQAQhlLf3igK128gIc0_fqqw5pRhBQv32TTwknIOua-8cDMPFsfaH9R3Owi4fjUMBv5OlhSaiy5otVVgPEs-CcOsj9uZy-JVuuS5nSbJ-pD0QKPkQsonlOmkl4HTBwrVOe7AzKp0/s400/bridge.jpg)
When ultrasonic waves are passed through platinum wire, connected to a metre bridge, the temperature of the platinum wire changes, which in turn changes the resistance of the platinum wire and hence the metre bridge goes to an unbalanced condition. Thus, with the alternate deflection in the metre bridge ultrasonic waves can be detected.
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