Intelligent sensors have been widely used in various industries in China

Micro-differential pressure switch, is a kind of micro-differential pressure sensor, it uses MEMS technology, it can provide a lot of normally closed, normally open nodes, without moving components, and has the advantages of insensitive orientation, good repeatability and long service life, etc., it is widely used in a wide range of fields, such as variable wind systems and HVAC systems.

The differential pressure sensor needs to be installed in accordance with certain regulations or through a certain design structure, which can effectively convert the change before and after the pressure into the relevant change of the pressure sensor, and then the weak signal output formed by the deformation of the sensitive element is processed and modalized, or it is then processed through the analog-to-digital conversion processing and the calculation processing of the chip. Output digital signal.

Now take capacitive differential pressure sensor as an example to introduce its working principle. The pressure transmitter has different pressures on both sides of the measured material through the high and low pressure chambers respectively, and acts on the isolation diaphragm on the two edges of the sensitive element, and then through the filling solution in the element and the isolation sheet, it is transmitted to the two sides of the treatment diaphragm, and the electrodes on the two sides of the insulation sheet and the measurement diaphragm form a capacitor respectively.

When the pressure on both sides is different, the measuring diaphragm will form a certain displacement, and its displacement is proportional to the pressure difference, so the capacitance on both sides is different, then through the oscillation and demodulation, it can be converted into a signal proportional to the pressure. Finally, the modulation of the signal can be successfully obtained the modulation current, the use of A/D converter can effectively convert the current in the demodulator into a digital signal, the microprocessor can use this value to judge the input pressure value, and finally the microprocessor to control the relevant work of the pressure sensor.

In fact, in real life, if we do not have a comprehensive understanding of the sensor principle mentioned above, the following should be very clear.

1, smart sensors are now widely used in industrial production, agricultural production, national defense, aerospace and other fields, optical alarm, humidity alarm, temperature alarm and water level alarm and so on are smart sensors.

2, electronic weighing, in fact, is based on the relevant principles of mechanical sensors to measure the pressure of the object on the strain gauge, so that the weight can be measured.

3, the community water supply is generally controlled in a certain range of water pressure, which requires the use of pressure sensors to measure the size of the water pressure.

4, digital cameras and mobile phone cameras, etc., are based on optical sensors to work, it can effectively capture the relevant image.

5, the smoke alarm used in daily life, it is based on the smoke resistance to measure the concentration of smoke, so that it can effectively complete the purpose of alarm.

6, automatic doors, many places are already in use, it is based on the human body's infrared microwave to open and close the door.

In short, the sensor is very widely used in reality, as long as you pay attention to observe, you can find a lot. Pressure sensor is the most used one, with the development of science and technology, the future products will be more integrated and intelligent, the function will be more comprehensive.