Another common name that relates to a pyrometer is ____________.

The correct term that relates to a pyrometer is a thermocouple. A pyrometer is a type of temperature measuring device, often used for measuring high temperatures that are typically outside the range of standard thermometers. A thermocouple consists of two different metals joined at one end, which generates a voltage that is proportional to the temperature difference between the joined end and the other ends. This voltage can then be interpreted as a temperature reading.

In industrial applications, both pyrometers and thermocouples are utilized for temperature measurement, particularly in processes involving heat and combustion, making the connection between them significant. While terms like variable thermistor, photo sensor, and thermo sensor may relate to temperature measurement, they do not directly correspond to the specific type of device that a pyrometer represents or functions in the same way as a thermocouple does within the context of high-temperature measurements and applications.