Acceleration sensor can be divided into the piezoresistive acceleration sensor, capacitive acceleration sensor and the piezoelectric acceleration sensor, piezo-resistive type generally have millivolt output type mV and two output V V value; And generally have charge piezoelectric acceleration sensor output type PE and low impedance voltage output type (IEPE) and the output current (4 ~ 20 ma); Capacitive acceleration sensor generally have millivolt output type mV and two output V V value;

Here mainly introduce the piezoelectric acceleration sensor electric charge output type (PE) and low impedance voltage output type (IEPE). The traditional piezoelectric acceleration sensor is sensitive to sensor through internal core body output a signal is proportional to the acceleration of the charge. Actually used in the sensor output signal high impedance charge must pass the secondary instrument converts it into a low impedance voltage signal can be read. Due to the high impedance signal charge very easily disturbed, so the sensor to the signal transmission between secondary instrument low-noise shielded cable must be used. Due to the use of electronic devices temperature range is limited, so under the environment of high temperature measurement is commonly used electric charge output type. IEPE type piezoelectric acceleration sensor is usually referred to in the ICP type piezoelectric acceleration sensor. Piezoelectric sensor transducer output through in sensor internal charge preamplifier is transformed into low impedance voltage output. IEPE sensors for second line output form, usually using constant current voltage source power supply; Dc power supply and signal using the same thread. Usually the output of the dc part in constant current power supply by a high-pass filter. Type IEPE sensors measurement signal is the biggest advantage of good quality, low noise, strong ability to resist interference and long distance measurement, especially the new data mining system of many have been equipped with constant current voltage source, therefore, IEPE sensors can be attached directly to the data mining system and does not require any other secondary instrument. IEPE sensors in the vibration test has gradually replace the traditional electric charge output type piezoelectric acceleration sensor.

In addition: about the digital output of analog output VS: this is the first to consider. This depends on your system and interface between acceleration sensor. General analog output voltage and the acceleration is proportional to, such as 2.5 V corresponding to the acceleration of 0 g 2.6 V corresponds to 0.5 g acceleration. Digital output generally use pulse width modulation (PWM) signal. If you use the micro-controller only digital input, such as the BASIC Stamp, you can choose the digital output acceleration sensor, but the problem is that you have to take up additional a clock unit for processing PWM signal, at the same time, the processor is also a big burden. If you're using microcontrollers have analog input port, such as the PIC/AVR/OOPIC, you can use to simulate the interface is very simple acceleration sensor, all that is needed is in the process to join a similar "acceleration = read_adc ()" instructions, and deal with the speed of the order as long as a few microseconds.