Everything in the nature process is related to the temperature, the temperature sensor
is * early development, * widely used type of sensor.
Correspondingly, according to the laws of the interaction between wave and material, successively developed acoustic temperature sensors, infrared sensor and weibo sensors.
Thermocouple sensor has its own advantages and defects, its sensitivity is lower, easily affected by environmental interference signal, also easily affected by preamplifier temperature drift, therefore not suitable for measuring the temperature of the small change.
As a result of the thermocouple temperature sensor sensitivity has nothing to do with the thickness of material, made of very fine material can also make a temperature sensor.
But also because of the metal material production thermocouple has the very good ductility, the slight temperature measuring element has high response speed, can measure the process of rapid change.
* of the temperature sensor is a variety of various sensors for a common, modern appearance of temperature sensor is very small, so more to make it widely used in the areas of production practice, also provide countless convenience to our lives and functions.
The temperature sensor has four main types: thermocouple, thermal resistance, resistance temperature detector (
And the IC temperature sensor.
IC temperature sensor and includes two types, that is, analog output and digital output.
Contact temperature sensor detection part of the measured object and has a good contact, also called a thermometer.
Thermometer reach thermal equilibrium by conduction and convection, which makes the value of the thermometer can directly said the temperature of the object to be tested.
General measure precision is higher.
At a certain temperature range, the thermometer can measure the temperature distribution within the object.
But for the movement of body or heat capacity is very small, small target object will produce larger error of measurement, the commonly used liquid thermometer with double metal thermometer, glass thermometer, pressure type thermometer, resistance thermometer, thermistor, thermocouple, etc.
They are widely used in industry, agriculture, business, etc.
People often use the thermometer in our daily life.
With low temperature technology in national defense engineering, space technology, metallurgy, electronics, food, medicine, and the wide application of petrochemical sector and superconducting technology research, measuring temperature below 120 k of the development of low temperature thermometer, such as low temperature gas thermometer, vapor pressure thermometer, acoustics, paramagnetic salt thermometer thermometer, quantum, low temperature thermal resistance and low temperature thermocouple thermometer, etc.
Low temperature thermometer for temperature sensing element is small in size, high accuracy, good reproducibility and stability.
Using the porous of high silica glass carburization sintering carburizing glass heat resistance is a kind of low temperature thermometer temperature sensing element, can be used to measure 1.
Within the scope of 6 ~ 300 k temperature.
As for real gas and liquid medium temperature radiation measurement, you can use insert to a certain depth of the heat resistant material to form a blackbody cavity.
Calculated by calculation with medium to reach the thermal equilibrium of the cylinder cavity effective emission coefficient.
In the automatic measurement and control can use this value to the measured temperature at the end of the cavity (
The medium temperature)
Modification and get the real temperature of medium.
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