Strain gauge based
Strain gauge based accelerometers use strain gauges acting as arms of a full Wheatstone bridge to convert mechanical strain to a DC output voltage that varies with the applied acceleration. Measuring tilt, inertial forces, shock and vibration, they are widely used in automobile industry and applied in securing safety performance of a vehicle, including anti-lock braking system, automotive safety air-bags and traction control system. Meanwhile, low frequency strain gage accelerometers with compact design are ideal for laboratory and light industry environments. Strain gauge accelerometers can be made more sensitive with the use of semiconductor gauges and stiffer springs, allowing higher frequency response and output signal amplitude. Compare to other types of accelerometers, strain gauge accelerometers can measure accelerations down to zero Hertz.
A strain gauge accelerometer is based on a full whetstone bridge design detecting the deflection of a seismic mass by using a silicon or foil strain gauge element. The deflection is directly proportional to the acceleration applied to the sensor. Comparable to the piezoresistive accelerometer, it has a frequency response down to zero Hz.
The strain gauges are either mounted to the spring, or between the seismic mass and the stationary frame. Strain gauge windings contributing to the spring action, are stressed under the forces (two in tension, two in compression), and a DC output voltage is charged by the four arms of the bridge which is proportional to the applied acceleration.
Acceleration transducers using TML exclusive strain gauges as the sensing elements provide uni-, bi- and tri-axial vibration and acceleration measurements in structures and machinery with a wide capacity range from .
- Suitable for high shock applications
- can measure accelerations down to zero Hz;
- High response;
- Compact and robust design.
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