文档介绍：2 The construction of temperature sensor
Temperature is a fundamental physical quantity. In the nature all processes are closely related to temperature. According to the law of wave interaction with matter. essively developed Acoustic temperature sensor, infrared sensor and microwave sensor. The four main types: thermocouples, thermistors, resistance temperature detector (RTD) and IC temperature sensor temperature sensor. IC temperature sensors, including two types of analog output and digital output.
5 Teomatic of temperature sensor-------Thermocouple
A thermocouple consists of two conductors of different materials (usually metal alloys) that produce a voltage in the vicinity of the point where the two conductors are in contact. The voltage produced is dependent on, but not necessarily proportional to, the difference of temperature of the junction to other parts of those conductors. Thermocouples are a widely used type of temperature sensor for measurement and control [1] and can also be used to convert a temperature gradient into electricity. Commercial thermocouples are inexpensive,[2] interchangeable, are supplied with standard connectors, and can measure a wide range of temperatures. In contrast to most other methods of temperature measurement, thermocouples are self powered and require no external form of excitation. The main limitation with thermocouples is accuracy;