check
check
check
check
Acceleration sensor is a common sensor type widely used in various fields. Its function is to measure the acceleration of an object within a specific time and convert the result into a corresponding electrical signal output.
There are two types of acceleration sensors: AC response acceleration sensors and DC response acceleration sensors.
AC response acceleration sensor: The output is AC coupled. It cannot be used to test static acceleration, such as gravity acceleration and centrifugal force acceleration. AC acceleration sensors are suitable for testing dynamic acceleration.
DC response acceleration sensor: The output is DC coupled and can respond to acceleration signals as low as 0 Hz. It is suitable for testing static and dynamic acceleration.
According to the working principle, acceleration sensors can be divided into: piezoelectric acceleration sensors, piezoresistive acceleration sensors, capacitive acceleration sensors, and servo acceleration sensors.
1. Piezoelectric acceleration sensor: The piezoelectric acceleration sensor has the characteristics of large dynamic range, wide frequency range, durability, little external interference, and the piezoelectric material self-generates charge signal under force without any external power supply. It is the most popular sensor. Widely used vibration measurement sensor. But it cannot measure signals with zero frequency.
2. Piezoresistive acceleration sensor: Piezoresistive acceleration sensor has the characteristics of small size and low power consumption. It is easy to be integrated into various analog and digital circuits and is widely used in automobile collision experiments, test instruments, equipment vibration monitoring and other fields. Piezoresistive accelerometers are susceptible to ambient temperature effects.
3. Capacitive acceleration sensor: It has a simple circuit structure, a wide frequency range of about 0~450Hz, linearity less than 1%, high sensitivity, stable output, small temperature drift, small measurement error, steady-state response, low output impedance, and The relationship between electric power and vibration acceleration has the advantages of being simple, convenient and easy to calculate, and has high practical application value. However, capacitive acceleration sensors are easily affected by the capacitance of the cable, and their cost is higher than piezoelectric ones.
4. Servo acceleration sensor: The servo acceleration sensor is a closed-loop testing system with the characteristics of good dynamic performance, large dynamic range and good linearity. Servo acceleration measurement technology is widely used in inertial navigation and inertial guidance systems, and is also used in high-precision vibration measurement and calibration.
