Sensors, known as the "eyes" and "ears" of electronic devices, can sense various types of information such as temperature, pressure, light, etc., and convert them into electrical signals for devices to interpret. Among them, piezoresistive pressure sensors have been widely used in multiple fields due to their high sensitivity, small size, and easy integration, becoming the "pressure detectives" in the field of technology.
working principle
The working principle of piezoresistive pressure sensors is based on the piezoresistive effect of semiconductor silicon. It uses a single crystal silicon wafer as the elastic element, and utilizes integrated circuit technology to diffuse a set of equivalent resistors on the single crystal silicon wafer, and connect the resistors into a bridge circuit. When the sensor is in a pressure medium, the medium pressure acts on the corrugated diaphragm, and the silicone oil is compressed to sense the pressure of the diaphragm to the semiconductor core. After being compressed, the resistance value of the silicon film changes, and the resistance signal is led out through the lead wire. After this change is amplified by an amplifier and calibrated with standard pressure, pressure detection can be performed.
application area
1. Industrial production
On the production line, piezoresistive sensors are used to monitor fluid pressure, ensuring the stability and safety of the production process. For example, in chemical production, by monitoring the pressure changes inside the reaction vessel in real time and adjusting process parameters in a timely manner, safety accidents can be avoided. In addition, it is also used to monitor pipeline pressure, ensuring the safe and efficient production and transportation of energy.
2. Aerospace
In the design and manufacturing of aircraft, rockets, and other spacecraft, piezoresistive sensors are used to measure engine thrust, providing important data support for performance evaluation and safe flight of the aircraft. At the same time, pressure resistance sensors are also used inside spacecraft to monitor cabin air pressure, ensuring the comfort and safety of passengers and crew members.
3. Robotics technology
In the field of industrial automation, piezoresistive sensors can be used to measure the clamping force and collision force of robots, providing precise force feedback to improve the accuracy and safety of the production process.
4. Medical equipment
In the biomedical field, piezoresistive sensors are widely used in medical devices such as blood pressure monitors and ventilators to achieve accurate monitoring and recording of patients' vital signs. For example, in a blood pressure monitor, a resistive sensor can sense real-time changes in blood pressure and transmit the data to a display for medical staff to refer to. With the development of medical technology, piezoresistive sensors have also been made into tiny sensor probes for monitoring internal tissue pressure in minimally invasive surgeries, providing precise force feedback for surgical operations.
5. Automobile manufacturing
In the automotive braking system, piezoresistive sensors are used to monitor the pressure changes of brake pads, ensuring the normal operation and driving safety of the braking system. In the suspension system, piezoresistive sensors are used to monitor the vibration of the vehicle body, provide data support for the adjustment of the suspension system, and improve ride comfort.
6. Other applications
Pressure resistance sensors can also be used for liquid level measurement, such as immersion type liquid level sensors that can adapt to liquid level measurement of water or other liquids with a depth of several meters to tens of meters and mixed with a large amount of dirt and impurities. In terms of acceleration measurement, piezoresistive sensors can measure the magnitude of acceleration by sensing the deformation of a cantilever beam by a mass block, and have been applied in fields such as aerospace and automotive manufacturing.
Technical advantages
The reason why piezoresistive pressure sensors can be widely used in multiple fields is mainly due to their unique technological advantages. Firstly, it has high sensitivity and can accurately perceive small pressure changes. Secondly, it has a small size and is easy to integrate, making it convenient to embed into various small devices. In addition, piezoresistive sensors also have the advantages of good stability, high reliability, and low power consumption.
Future prospects
With the continuous advancement and innovation of technology, the application fields of piezoresistive pressure sensors will further expand. For example, in the field of the Internet of Things, piezoresistive sensors can be an important component of smart devices, enabling real-time monitoring and data analysis of the environment. In the field of intelligent manufacturing, piezoresistive sensors can be used to improve the automation and intelligence level of production lines. In addition, with the development of new materials and technologies, the performance and stability of piezoresistive sensors will also be further improved.
In summary, piezoresistive pressure sensors play an important role in multiple fields due to their unique performance advantages. In the future, with the continuous advancement and innovation of technology, resistive pressure sensors will bring us more surprises and convenience.
Source: Sensor Expert Network. If there is any infringement, please contact us for deletion