The temperature sensor is widely used in electrical control, protection or control circuits. It is necessary to adjust the thermal conditions during the operation of a wide variety of equipment in production. Such devices are also widely used in household appliances: washing machines, televisions, computers, etc. The use of a temperature sensor allows you to avoid many accidents and save expensive equipment in production and at home.
These devices convert the measured temperature of an object into an analog or relay signal understandable for receiving equipment. They differ in the way they convert the thermal signal and come in several forms:
- It has long been known that when the temperature changes, the internal resistance of materials changes. On the basis of this, thermoresistive thermal sensors were created. This type of temperature sensor has small dimensions and good performance. It is well suited to work in low-current circuits with electronic circuits that isolate any change in resistance and use the received signal for furthertransformations. The disadvantages include the non-linearity of the characteristic, which leads to the complication of the schemes for changing the received signal.
- Semiconductor thermal sensors work on the same principle, but they are much more sensitive than thermistor ones. They have a linear characteristic, they are easy to make at home. The disadvantages include a small range of measured temperature (-55 - +155).
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temperature sensors Thermoelectric converters are widely used in production, for example, in electric arc furnaces for process control. Thermocouples of platinum or tungsten groups have a wide temperature measurement range. They can operate normally in conditions above the melting point of many metals. This type of temperature sensor can be found in everyday life, it can be used to control the temperature in the sauna.
- For remote temperature measurement, special devices are used that register heat waves emanating from heated bodies. This type of temperature sensor is called a pyrometer. The disadvantages of such devices include frequent distortion of the temperature field and a decrease in the stability of the device itself.
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temperature sensors Acoustic sensors are used for measurements in gas and other media. They can be useful where contact measurement methods are not possible. The principle of their operation is based on a change in the speed of passage of acoustic waves in differently heated media. Temperature sensors of this type have a large error. Often repeated measurements are required to refine the measurement results.
All of the above temperature sensors are widely used in the design and creation of electronic devices of varying degrees of complexity. Without them, the functioning of most of the circuits becomes impossible, and a lot depends on their stable operation. When designing the most critical units based on these elements, duplication of readings from various sensors is often used.
