Introduction to Force Sensors
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Force sensors are washer type loadcells that piezo effect of quartz crystal is utilized. Extremely small size with a wide measuring range.
- High rigidity and durability
- Measurement of high speed variations of loads (a few millisecond)
- Apply to quasistatic measuremrnt (With the use of an exclusive charge amplifier)
- Monitor for precision press machine
- Monitoring of press for spot-welded electrode
- Monitoring of crimping force for cable terminal
- Measurement of bolt axial tension
A piezoelectric element such as piezoelectric ceramics or quartz crystal generates an electric charge proportional to the mechanical force applied:
Fuji Ceramics force sensors are a direct application of this characteristic.
A sensor is placed tightly between two flat and high rigidity plates (upper and lower plates) so that the load is distributed uniformly over the sensing surface.
It is necessary to calibrate sensitivity after preloads (pinched by a bolt).
Output of force sensor
Discharge time constant and Zero shift are the features of piezoelectric force sensors.
We provide AIST traceable calibration.
- Output per one N(newton). Linear outputs are obtained for up to the maximum usable load.
- Measurement range
- Maximum load that can be measured by a force sensor in normal operating conditions.
- Should a load exceeding the measurement range be applied to a sensor, this sensor does not deteriorate in characteristics. Sensors may not be used continuously under the overload.
- Discharge Time Constan（t DTC）
- A piezoelectric force sensor is characterized by self-discharge. The output voltage presents an exponential curve that changes at a proportional rate for a given length of time. The discharge time constant is the period of time during which the output voltage drops to 36% of the initial value.