Biomedical Engineering Reference
In-Depth Information
Table 2.1
Comparison of different sensor technologies used for measuring force
Sensor type
Advantages
Disadvantages
Capacitive
Good sensitivity
High impedance
Moderate hysteresis
Complex circuitry
Wide dynamic range
Susceptible to noise
Linear response
Limited spatial resolution
Robust
Some dielectrics are
temperature sensitive
Conductive polymers
Inexpensive
High hysteresis
Easy to install
Low accuracy
Not viable for small force
measurements
Nonlinear variation
Inductive
High resolution
Low frequency response
Static and dynamic response
External magnetic field
influence
No temperature dependence
Miniaturization impossible
Magnetic (Hall effect)
Wide dynamic range
Measures field in only one
direction
Low hysteresis
Linear response
Robust
Magnetic (magneto-elastic)
Simpler than hall effect
Susceptibility to stray fields
and noise
Measure field in two directions
Wide dynamic range
Low hysteresis
Linear response
Robust
Optical (frustrated internal
Formable
Bulky
reflection)
Very high resolution tactile
image
Complex construction
Optical (opto-mechanical)
Good repeatability
Creep
Memory
Hysteresis
Temperature dependence
Optical (fiber-optic)
Lower noise
Complex construction
Flexible
Optical sensors
Linear response
Complicated optic system
(photoelasticity)
Hysteresis
Not formable
Creep
Memory
Optical (tracking of optical
markers)
No interconnects to break
Requires processing for
computing applied force
Hard to customize
( continued )
 
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