Page 263 - Compression Machinery for Oil and Gas

248 SECTION II Types of Equipment

Instrumented coupling types
Strain gages
Bonded to
Rotary
spool
Industrial
transformer
coupling
Strain gage type
Strain
gages
Driven
Driving
Intermeshed pickup teeth machine
machine
Stator support
Electronics
Phase shift type
Flexible coupling
Monopole sensors
Display
Cond. unit
unit
FIG. 5.58 Instrumented couplings—typical components. (From Bill Meier, Dave Edeson, Devel-
opments in Continuous Torque Monitoring Couplings, Presented at Ethylene Producers’ Confer-
ence, Orlando, FL.)

Laser rotational vibrometers
f
Mirror
o
Beam f + f + f
o b d
Photo
f splitter
o
Reference
detector
Basic Operating Principle
beam
Test
beam
f + f + f
b
o d
Laser
f f + f
o Bragg cell o b
Beam Beam
Target
f + f
splitter o b dplitter
Representative twin beam portable unit
FIG. 5.59 Laser rotational vibrometer operating principle. (Sources: Basic operating principle
(http://en.wikipedia.org/wiki/Laser_Doppler_vibrometer) and Representative twin beam portable
unit (http://www.polytec.com/us/products/vibration-sensors/special-application-vibrometers/rlv-
5500-rotational-laser-vibrometer/.)