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Self-mixing interferometry for speed measurement
 Open loop Hall-Effect current sensors
 Optical Reflective Gear Tooth Sensor
 Method for Measuring Current Derivative Signal
 Rotational Speed Measuring and Calibration System
 Thermal drift of open-loop Hall Effect current sensor
 Direction Detection Based on the Output Duty Cycle
 Optimization of Conductor Structural Parameters
 Offset Error reduction in Hall Current Sensors
 Zero Offset Reduction in Hall Effect Sensors
 Error Correction of Automatic Testing Systems
 Design of Hall Effect Gear Tooth Speed Sensors
 Error Compensation of Hall Effect Current Sensors
 Parameter Optimization of Hall Gear Tooth Sensors
 Split Core Closed Loop Hall Current Sensors
 Mathematical Models of Gear Tooth Sensors
 Accuracy Improvement in Measuring & Test Systems
 Frequency-selective Adaptive Filtering
 Inductive eddy current sensors for stress measurement
 Fiber optic Bragg-grating sensors
 Capacitive Sensors for Displacement Measurement
 Self-calibration measuring methods
 Precise impedance measurement
 Measuring system of position transducers
 Self-correction algorithms
 Frequency selective-adaptive filtering
 Precise Fourier-analysis
 Parameter determination of damped oscillation signals
Competent Team
 Dr.-Ing. habil. Jigou Liu
 M.Sc. Jane Chen



High Sensitive Magnetoelastic Sensors
for Measurements of Mechanical Quantities
 


Magnetoelastic sensors are very sensitive for measurements of mechanical vibration, shock, strain, force and acceleration etc. This is shown in the following experiments results.


Fig. 1   Experiment arrangement (a) direct exciting on sensors; (b) exciting on the table (l=300mm)

In the first experiment a mini sphere falls directly on the sensor and excites a dynamic vibration/shock to the sensor (see Fig. 1a). The vibration of sensor increases with the height of the exciting sphere. Fig. 2 shows the maximal amplitude of oscillation signals as function of the height h. A sensor output signal greater than 700mV can be generated by a 50mg metal sphere from the height of 30mm.

Fig. 2   Sensor output signal generated by a direct exciting on sensors with a mini sphere

Fig. 3 shows results from the second experiment. In this experiment a mini sphere falls down on a table (see Fig. 1b). The distance between the exciting point and sensor is 300mm. The exciting vibration/shock is transferred through the table to the sensor and detected by the sensor. The sensor is also very sensitive in this case.

Fig. 3   Sensor output signal generated by a indirect exciting on a table with a sphere




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