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

 

 

 

​https://blog.naver.com/vs72

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