Which device is specifically used to sense temperature changes?

The device specifically used to sense temperature changes is the Resistance Temperature Detector (RTD). RTDs operate based on the principle that the resistance of certain metals changes with temperature. These devices are made of pure materials such as platinum, which provides high accuracy and stability over a wide range of temperatures. Their design typically includes a thin wire wound around a ceramic or glass core, allowing for precise measurement of temperature variations.

RTDs are widely used in various industrial and laboratory applications for temperature monitoring and control due to their reliability and repeatability. They are capable of providing highly accurate readings, making them suitable for environments where precise temperature measurement is critical.

While other devices listed may have applications in measuring other physical parameters, they do not specifically focus on temperature changes as effectively as an RTD does. For example, a thermocouple also measures temperature but operates on a different principle involving the voltage generated at the junction of two different metals. However, its accuracy can be less than that of an RTD, particularly in certain applications.