The primary components of pyrometers revolve around their ability to measure temperature, particularly in high-temperature applications. Thermocouples are devices that generate a voltage based on the temperature difference between two junctions of dissimilar metals. This voltage can be measured and converted into a temperature reading. A voltmeter is essential for measuring the output voltage from the thermocouple, which is indicative of the temperature being measured.
In the context of pyrometers, which often utilize the principles of thermocouples to measure temperature, the combination of thermocouples and a voltmeter forms the cornerstone of their functionality. This allows for accurate measurement across a wide range of temperatures, making them suitable for various industrial applications.
While other options mentioned various components like infrared sensors, thermistors, resistors, and diodes, these do not fundamentally describe the core operational components of traditional pyrometers. Infrared sensors measure temperature from a distance by detecting infrared radiation, while thermistors function by changing resistance with temperature but are not typically part of pyrometer design. Resistors and diodes serve different purposes and are not integral to the primary operation of pyrometers. Thus, the focus on thermocouples and a voltmeter is what establishes a pyrometer