BISOPE series
50- Displacement sensor 3 (types and weaknesses)
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Displacement means the maximum distance that has changed around
the reference line, so it is easy to intuitively judge the maximum amplitude of
vibration, and since the amount can represent and replace the magnitude of
stress, the main unit of vibration used in various standards (displacement,
speed, acceleration). In particular, it is widely used for direct deflection and
vibration of structures, vibration monitoring of pipes, and ‘online monitoring’
of shaft behavior using sleeve bearings. This is also the reason why
low-frequency acceleration sensors are widely used. The sensor used at this
time is accurate and good for evaluation if it directly outputs the
displacement, but on the other hand, there are many cases where its use is limited due to
limitations in its installation, orientation, and frequency.
Understanding the diversity and
weaknesses of displacement sensors
Type of Displacement sensor | Image | Disadvantages and Features |
Eddy current principle , Proximity probe, Gap sensor | - Responds only to conductors
- Interference between nearby sensors and nearby conductors (a gap of at least 3 times the diameter of the sensor must be provided)
-Vibration measurement below the unit of mm
Linear measurement below -1000Hz | |
LVDT | -Linear variable differential transducer (measuring the amount of movement of protrusions, bar type, wire type, )
- When measuring absolute displacement, it is necessary to manufacture a jig for the reference position
- Suitable for low frequencies (below 50Hz)
| |
Strain gauge | Measuring micro displacement, vulnerable to noise
| |
Laser doppler | High-frequency measurements (40 kHz) are very expensive | |
Ultrasonic | Weak in accuracy, low price, general purpose
| |
CCTV, GPS | Currently actively researching resolution issues |
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#fft, #vibration education, #acceleration sensor, #3-axis vibration sensor,
#status monitoring, #vibration monitoring, # Wireless vibration monitoring, #facility
diagnosis, #frequency analysis, #resonance measurement, #resonance analysis,
#SDT
