Highly sensitive single-axis capacitive accelerometer sensors are available in ±1g, ±5g, and ±50g. Excellent frequency response of 0 to 1000Hz (±10%) at ±1g ensures accurate vibration measurements. The single axis accelerometer is housed in a durable stainless steel case and is compact with a 2 meter shielded cable for easy installation.

Specifications

Features

• This SADR series axial capacitive accelerometer sensor has single-axis output.
• Can measure static acceleration, such as gravity acceleration and inclination and other physical measurements, high sensitivity, stable performance.
• Low voltage and current, low power consumption, strong anti-interference ability.
• Acceleration sensor total weight 20g, small size and light weight, more convenient installation.

Dimension (unit: mm)

Working Principle

Capacitive accelerometer sensors use micromachining technology to machine a variable gap differential capacitive sensitive element on a silicon wafer. As shown in the figure below, the differential capacitance is composed of two fixed pole plates and one movable pole plate, where the movable pole plate is connected to the inertial mass block, i.e. the cantilever beam shown in the figure. The motion of the cantilever beam causes a change in the differential capacitance, which is then amplified, converted and detected by a circuit integrated on the same silicon wafer to output a voltage signal proportional to the acceleration.

The SADR series of single-axis capacitive accelerometer sensors require at least a single +5V or +3V DC power supply to interface with standard data acquisition systems. The sensitivity and 0g DC bias voltage values are proportional to the supply voltage. The output voltage increases from the 0g output value for positive acceleration and decreases for negative acceleration.

When subjected to acceleration, the DC output voltage value is: V_out=Vs/2+ (sensitivity x a x Vs/5)

where Vs is the supply voltage in V and a is the acceleration value in g.

The AC output voltage value is: V_out= Sensitivity x a

Wiring Diagram

Tips: Single axis capacitive accelerometer sensor to measure the inclination of the formula

The SADR series capacitive accelerometer sensor uses a differential capacitance sensitive element whose output voltage depends on the magnitude of the inclination angle with respect to gravity. The inclination output of the sensor depends on the magnitude of the gravity force parallel to the same sensor, and the inclination angle is measured according to this principle.

For angles greater than 10°, the calculation should be based on the following formula:

• SIN α=SIN [(Output voltage at inclination to be measured - 0g DC bias voltage)/sensitivity].

For inclination angles less than 10°, the calculation can be done directly in radians using the formula:

• α = [(output voltage at inclination to be measured -0g DC bias voltage 0)/sensitivity] x (180/π)