Definition, working principle and type of temperature sensorThe temperature sensor is used to measure the temperature of the physical object. Generally, the converter is just converting physical quantities to electrical energy. Therefore, the temperature sensor is an instrument used to convert the thermal energy of the substance into an electrocompyle. In other words, it is an electrical device for automatic measurement temperature. The latest use of the temperature sensor is to measure the heat of the material in a readable format.
The main characteristics of temperature sensor
Although the types and applications of temperature sensors are diverse, their basic principles and characteristics are very similar. The summary is as follows:
The input of the temperature sensor is always calories
They regularly convert heat into electricity
They are usually used to determine temperature and heat flow
Basic diagram of temperature sensor
Sensor element
The sensor in the temperature sensor is an element that changes with the temperature changes. With the changes in temperature, the specific attributes of the component will have corresponding differences. For example, in the resistance temperature detector (RTD), the sensing element is platinum.
Determine the acceptable limit of sensing components can be compiled as follows:
The changes in the material unit of the temperature of each unit should be significantly significant.
The material must have a large resistance to use the minimum volume of substances in its manufacturing.
Materials must be continuous and lasting with temperature.
Transfer component
Power components are components that convert the output of sensor elements into electricity. The characteristics of the sensor element are used as its output. It measures changes in the characteristics of sensor components. Then calibrate the result to generate output, representing changes in heat. For example, in the thermocouple , the potential difference generated between the two terminals was measured through the voltage meter. The voltage amplitude generated after calibration provides the concept of temperature changes.
Types of Temperature Sensor
From a general perspective, the temperature sensor can be divided into contact and
non - contact type temperature sensor . In the contact type, the sensor element is in direct contact with the material; therefore, they use the thermal conductivity mechanism to convey the thermal energy. In non -contact sensors, components do not contact the heat source directly, which means that the
non - contact temperature sensor uses the flow mechanism for heat transfer. For more information about various types of heat transfer, click here.
According to the function and structure of the sensor, there are many types of temperature sensors, which can generally be divided into the following categories:
thermal resistance temperature sensor
resistance thermometer Temperature sensor
Heat Temperature sensor
Integrated circuit temperature sensor
