E1C12 09/14/2010
13:54:11 Page 528
transducer and sensor. If the sensor is approximated as a circular right cylinder, the relationship
between applied force and deflection is given by
dy ¼
p
2
À
4
p
F n D
3
16EI
ð12:17Þ
Load-bearing surface
Quartz crystals
Charge pickup
Cable
mount
Impedance
converter
Mounting thread
Mounting surface
Figure 12.24 Piezoelectric
load cell design. (Courtesy of
the Kistler Instrument Co.)
Strain
gauges
Strain
gauges
2
d
o
h
t
e
M
2
d
o
h
t
e
M
Method
1
Applied
load
Applied
load
Displacement
sensor
Figure 12.25 Ring type load cell, or proving ring.
528 Chapter 12 Mechatronics: Sensors, Actuators, and Controls
13:54:11 Page 528
transducer and sensor. If the sensor is approximated as a circular right cylinder, the relationship
between applied force and deflection is given by
dy ¼
p
2
À
4
p
F n D
3
16EI
ð12:17Þ
Load-bearing surface
Quartz crystals
Charge pickup
Cable
mount
Impedance
converter
Mounting thread
Mounting surface
Figure 12.24 Piezoelectric
load cell design. (Courtesy of
the Kistler Instrument Co.)
Strain
gauges
Strain
gauges
2
d
o
h
t
e
M
2
d
o
h
t
e
M
Method
1
Applied
load
Applied
load
Displacement
sensor
Figure 12.25 Ring type load cell, or proving ring.
528 Chapter 12 Mechatronics: Sensors, Actuators, and Controls