What kind of thermometer temperature measurement methods are there?

According to the use of temperature measuring instrument, usually can be divided into two types: contact and non-contact method. 1. Contact method, such as the bimetallic thermometer contact temperature measurement method is to make the temperature sensitive element and the object being measured in contact, when the measured temperature and the temperature sensing element reaches thermal equilibrium, the temperature sensitive element and equal temperature the temperature of the object under test. If one of them as the thermometer, you can use it to another object to realize temperature measurement, the temperature measuring method is called the contact method. Advantages: simple, reliable, high precision, disadvantages: good thermal contact, lag, destroy the object temperature field, the discomfort of high temperature measurement. 2. Non-contact method, such as infrared thermometer temperature measuring device is not in direct contact with the object to be tested, but can use objects of thermal radiation ( Or window) The principle of determination of the object temperature with the temperature, the temperature measuring method called non-contact method. Advantages: don't change the object temperature field, temperature measuring range, no ceiling, quick response. Weakness: the error is large, vulnerable to emissivity, distance, outside factors such as dust and water vapor.