1 temperature sensor is a kind of sensor which makes use of all kinds of physical properties of the material to change the temperature. The physical properties of these changes are mainly. The temperature sensor is the core part of the temperature measuring instrument. According to the measurement method can be divided into two types of contact and non-contact, in accordance with the characteristics of sensor materials and electronic components are divided into thermal resistance and thermocouple of the two categories.

2 temperature sensor principle - Advantages

Temperature sensor thermocouple is one of the most commonly used temperature detection devices in industry. Its advantage is:

High measuring accuracy. The temperature sensor is directly contacted with the measured object, and is not affected by the medium.

Wide measuring range. Commonly used temperature sensor thermocouple from -50~+1600 DEG C can continue to measure, some special temperature sensor thermocouple can be measured to -269 DEG C, up to +2800.

Simple structure, easy to use. Temperature sensor thermocouple is usually composed of two different wire, and not by the size and the beginning of the restrictions, there are protective sleeve, very convenient to use.

3 temperature sensor principle

The following is a brief introduction to the principle of the digital temperature sensor, which uses the PTAT structure, which has the characteristics of accurate, temperature dependent and good output. The output of the PTAT is modulated into a digital signal by the duty cycle comparator, and the relationship between the duty cycle and the temperature is as follows: DC=0.32+0.0047*t, t. The output digital signal is compatible with the microprocessor MCU, and the duty cycle of the square wave signal of the output voltage can be calculated by the high-frequency sampling of the processor.

4 principle of temperature sensor application

The temperature sensor is widely used for temperature measurement and control, temperature compensation, flow velocity, flow rate and wind velocity measurement, liquid level indicator, temperature measurement, ultraviolet and infrared measurement, microwave power measurement is widely used in color TV, computer color display, switching power supply, water heater, refrigerator, kitchen equipment, air conditioning, automotive and other fields. In recent years, the rapid growth of automotive electronics, consumer electronics industry led to the rapid growth of China's demand for temperature sensors.