附录3
外文原文
Principles of Infrared
Thermometry
The fundamentals of IR thermometry are an important prerequisite for specifying an accurate monitoring system. Unfortunately,many users do not take the time to understand the basic guidelines, and consequently reject the concept of noncontact temperature measurement as inaccurate.
Theory and fundamentals
Temperature measurement can be divided into two categories:contact and noncontact.Contact thermocouples, RTDs, and thermometers are the most prevalent in temperature measurement applications. They must contact the target as they measure their own temperature and they are relatively slow responding, but they are inexpensive. Noncontact temperature sensors measure IR energy emitted by the target, h