How to use MEMS vibration sensor to realize automotive external pickup

Micro-Electro-Mechanical Systems (MEMS) vibration sensor is a kind of miniature sensor whose structure can realize the perception and measurement of vibration signals. Automotive external pickup refers to the use of vibration sensors to capture the sound of the outside of the car, and analyze and process it. This technology can be used in the fields of automobile driving assistance system, traffic monitoring system, etc., which is of great significance to improve traffic safety and traffic management.

The MEMS vibration sensor uses MEMS technology to manufacture a tiny structure, which contains the sensor, LM158JG amplifier and signal processing circuit. When the sensor is subjected to external vibration, the sensor will generate the corresponding electrical signal, which is amplified by the amplifier, filtered, amplified and digitized by the signal processing circuit, and finally the usable vibration signal is obtained.

Using MEMS vibration sensor to realize external vehicle pickup refers to collecting and analyzing external sound signals in real time by installing MEMS vibration sensor outside the vehicle. This technology can be used in automotive noise control, safety monitoring, intelligent driving and other applications.

A MEMS vibration sensor is a sensor based on microelectromechanical system (MEMS) technology that can measure and detect the vibration and acceleration of an object. Its working principle is to use the micro structure and sensor components in MEMS to measure the vibration and acceleration by measuring the capacitance or resistance changes caused by small vibration.

In automotive external pickup applications, MEMS vibration sensors can be installed in the chassis, door, hood and other parts of the car to collect and analyze external sound signals in real time. By analyzing these acoustic signals, we can achieve the following:

1, noise control: by analyzing the noise of the external environment, you can control the sound insulation effect of the car in real time and improve the ride comfort. For example, when the sensor detects a large noise outside the car, it can automatically adjust the volume and sound quality of the stereo inside the car to maintain the comfort of the passenger.

2, safety monitoring: by analyzing external sound signals, potential dangerous situations can be detected in real time, such as emergency brake sound, horn sound, etc. When the sensor detects these sounds, it can issue a warning to the driver in time and take corresponding measures to improve driving safety.

3, intelligent driving: Through the analysis of external sound signals, you can identify the driving state and direction of other vehicles to achieve intelligent driving functions. For example, when the sensor detects the sound of a vehicle changing lanes in front of it, it can warn the driver in time and automatically adjust the vehicle's driving trajectory to avoid a collision.

The following technical challenges need to be considered for the implementation of automotive external pickup:

1, noise suppression: due to the large noise of the external environment of the car, the sensor needs to have the ability to suppress noise to ensure that the target sound signal is accurately captured. Digital filtering, adaptive filtering and other technologies can be used to process the signal collected by the sensor to remove the noise interference.

2, signal processing: the sound signal collected by the sensor needs to go through a series of signal processing algorithms to extract useful information. We can use time domain analysis, frequency domain analysis, wavelet transform and other methods to extract and classify the signal features to realize the recognition and analysis of different sounds.

3, real-time requirements: the car external pickup needs to process the sound signal in real time, and make a corresponding response in time. Therefore, sensors and signal processing algorithms need to have high computing performance and processing speed to meet the requirements of real-time.

4, reliability and stability: the car external pickup needs to work in harsh environmental conditions, such as high temperature, low temperature, humidity, etc. The sensor needs to have high reliability and stability to ensure the normal operation for a long time.

To sum up, the use of MEMS vibration sensors to achieve automotive external pickup is a technology with great potential. Through reasonable design and optimization algorithm, accurate capture and analysis of external sounds can be achieved, bringing more possibilities for automotive noise control, safety monitoring, intelligent driving and other applications.