These instruments, known technically as spot pyrometers, use a device called a bolometer to estimate an object's temperature.

这些仪器，技术上称为现场高温计，使用一种称为辐射热测定器的设备来估计一个物体的温度。

Instead of a single bolometer, it has an array of them.

它不是单一的辐射热测定器，而是大量的辐射热测定器。

A bolometer's electrical resistance depends on how hot it is.

辐射热测定器的电阻取决于它的热度。