3. Diffused silicon pressure sensor – small size and large signal

A77146-220-51 The principle is that the pressure of the measured medium directly acts on the diaphragm of the sensor, so that the diaphragm generates a micro displacement proportional to the pressure of the medium, so that the resistance value of the sensor changes, and relies on the electronic circuit to detect the change, and quickly converts and outputs the corresponding standard measurement signal.

A significant advantage of the diffused silicon pressure sensor is that the signal output is large, which provides a great advantage for the back-end transmission conditioning line, coupled with high resolution and high sensitivity, and its optional back-end circuit is more. Secondly, the small size of diffused silicon is easy to install and can be widely used in medical devices to assist biological monitoring.

4, sapphire pressure sensor – precision high price

Similar to the working principle of the first strain resistance type, the receiving diaphragm deforms after being subjected to the transmission pressure, and when the change is sensed by the silicon-sapphire sensor, the bridge will output a change electrical signal proportional to the pressure.

As a semiconductor sensitive element, sapphire has unparalleled metrological characteristics, neither hysteresis, fatigue and creep phenomenon, but also with extremely high hardness is not afraid of deformation. In addition, sapphire has very good elastic and insulation characteristics, such sensors can work in a variety of extreme environments, and high reliability, good accuracy, and minimal temperature error. Its disadvantages are also obvious – the price will be more than twice A77146-220-51 as expensive as other pressure sensors, and the application scenarios are generally in high-end or heavy equipment.

5, piezoelectric pressure sensor – dynamic scene advantage

The piezoelectric pressure sensor works based on the piezoelectric effect. From the perspective of structure, there is a thin cylinder inside. When the pressure is applied to the inside of the thin cylinder, the internal tension of the cylinder increases, so that its natural vibration frequency increases. As long as the natural vibration frequency of the cylinder is measured, the pressure can be known.

Piezoelectric sensor has the advantages of simple structure, small size, light weight and long service life. However, it can not be applied in static measurement, because the charge after being subjected to external force can only be saved when there is an infinite input resistance in the loop, so it can only be applied in dynamic measurement, such as piezoelectric inkjet printheads, the use of piezoelectric MEMS in the camera for autofocus and so on.

In addition, piezoelectric acceleration sensors have been widely used in the vibration and shock measurement of aircraft, automobiles, ships, Bridges and buildings, and have a special position in the aviation field.

A77146-220-51 With the advent of the IOT era, what are the application scenarios of pressure sensors?

Throughout the entire industry chain, the upstream of the pressure sensor is mainly a raw material supplier, and the upstream manufacturers provide metal sheets, ceramic sheets, silicon wafers, sapphire-silicon pressing sheets and other materials required for packaging. The rising prices of most raw materials this year have a greater impact on the pressure sensor industry in the middle reaches.

The downstream application of pressure sensors is very wide, in addition to automobile manufacturing, machinery industry, medical equipment and other industries, but also in aerospace, consumer electronics and other products used, with the advent of the Internet of Things era, more and more intelligent products are also in urgent need of induction components to meet consumer needs.

In recent years, new semiconductor materials continue to emerge, so that the structural design of pressure sensors, sensitive component integrated design, processing technology to break through the iterative, MEMS pressure sensors supply and demand continue to increase, its application range can also move to a broader field. There are many well-known domestic pressure sensor suppliers, but most of them are concentrated in the hands of product integrators, and supporting products A77146-220-51 are sold together. The following pressure sensor companies are representative:

Wanxun Controls is engaged in the production and marketing research and development of industrial automation instruments, its main products pressure instruments and accessories sales contribution has increased year by year, the annual output of MEMS pressure sensors reaches 15 million, and it is also engaged in customized instrument business.

The main attack refrigeration accessories and refrigeration equipment, most of the refrigeration equipment in use need to measure the pressure for a long time to ensure that the work is not abnormal, so the product and sensor components are manufactured together to form their own industry chain.

Goerg shares in the high-fidelity earphone OEM can be called a unique, 2020 sales revenue of nearly 60 billion, nearly 50% of the revenue is from the big customer Apple earphones. Goerl’s electronic components business accounts for 98%, and its main product in-ear headphones have MEMS chips and sensors inside to meet various interactive functions of headphones.