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MINIATURE LVDT SENSOR

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BACKGROUND: MINIATURE LINEAR VARIABLE DIFFERENTIAL TRANSFORMER

The miniature LVDT sensor new provide précised measurements of displacement, a position as well as path ranging in single-digit millimetres. The exact measurement of travelling distances is done as per ±1 mm, ±2 mm as well as ±5 mm. Also due to tiny dimensions of the sensor, it has a length of 79 mm along with a diameter of 8 mm and the total weight measuring up to 30 g inclusive of the cable (Xiao et al., 2019). Also, the miniature LVDT sensor navigates signalling and sensing within very tight-fitting conditions which best suits the small-sized requirements (Da et al., 2001).

Suitable dimensions for the smallest and most miniature full Bridge LVDT sensor have a diameter of only 2.3 mm equivalent to 0.09″ along with layer wound. It provides superior stability to the device and its measurements along with linearity as well as repeatability.

WORKING OF MINIATURE LVDT SENSOR:

The miniature LVDT sensor works on a non-contact measuring principle which means moving magnetic core of the sensor has no in physical contact with the internal components and thus frictionless movement. The miniature LVDT has high efficiency working with long-life expectancy along with high reliability even in high cycle applications. Also, the induction and coupling of miniature LVDT sensor help in prolonged age of a coil within the sensor have a primary winding along with coupling effect in 2 secondary windings (Witowski et al., 2018). This provides a differential output signal and thus transforms the linear motion of the LVDT miniature measuring sensor with contact-free working into a single electronic signal. The miniature LVDT sensors operate independent of any wear and tear wear along with a linearity tolerance of less than 0.25%. In addition to this, miniature LVDTs are produced with very small linearity tolerance of less than 0.1%.

The miniature sensors are versatile in their applicability in terms of medical technology, engineering works, agricultural production facilities and sensing operations as well as navigation up to testing facilities along with the manufacture of special-purpose machinery with compact designing. The ultra-light core position detection occurs by measurement of the differential reluctance of primary and secondary coils. The measurement utilizes using a sinewave excitation in association with synchronous demodulator. This method is distinct for miniature LVDTs as it provides a sensitive measure of core position along with associated cancellation of higher temperature ill-effects.  

In addition to this, the transducers’ coils as well as flex circuit leads are sealed in vacuum pumped epoxy, inside the stainless steel case (Bodnicki et al., 2016). This provides the sensor with an excellent range of environmental resistance making it multi-dynamic use. 

WHY TO USE MINIATURE LVDT SENSOR: HOW MINIATURE LVDT SENSOR OVERCOMES THE LIMITATIONS OF NORMAL LVDT:

· The miniature LVDT sensor overcomes the limitations of normal LCDT in terms of high precision of this sensor. The miniature LVDT sensor has a full-scale measuring range from ±0.025 inch (±0.63 mm) to ±1.0 inches (±25 mm). 

· Also it overcomes eddy currents and unnecessary weight problems of the electromagnetic core as it has a low mass of the core element which makes these miniature LVDT sensor optimized for high response dynamic measurements. 

· In addition to this, it has high resolution along with excellent repeatability. The miniature LVDT sensor overcomes problems of hysteresis and thus experiences low hysteresis associated with high sensitivity consistent with good linearity.

· The maximum linearity error recorded for high precision miniature LVDT sensor is ±0.25% of full range output which utilizes a statistically best-fit straight line derived by the least-squares method.

BENEFITS OF USING MINIATURE LVDT SENSOR:

· It has a miniature approximately of the size 3/8 inch with low core mass. 

· Its measurement ranges of ±0.025″ to ±1.0″ [±0.63 mm to ±25 mm] 

· Also it has non-linearity much less than other LVDT sensors and is less than ±0.25% of normal LVDT sensor.

· It has a high operating temperature up to 220°F i.e. 105°C.

· The coil assembly if properly sealed to avoid unnecessary slipping of the core element.

· It has magnetically shielded protection (“Miniature LVDT Displacement Sensor | AML/M,” n.d.). 

· The robust, as well as a highly accurate displacement sensor, has submicron resolution along with non-contact position measurement.

·   It has linear analogue output with a flat dynamic response to kHz levels. 

· Also the miniature LVDT sensors have much low-temperature coefficients. 

· Also the core element material is flexible, elastic and newer technologies employ biocompatible alloys for providing resistance to kinking as well as permanent deformation and the integral strain is relieved. 

· Thus the miniature LVDT assures high performance in a tiny spaced packaging along with the usage of advanced materials which increase its ruggedness, quickness as well as the sensitivity of measurement and used in submersion elements in aqueous environments.

· The longer stroke lengths used in miniature sensors assure greater linearity; and signal conditioning by multichannel “plug and play” enclosures (Zhu et al., 2006).

 

 

APPLICATIONS OF MINIATURE LVDT SENSOR:

· It is being used in process controlling as well as quality control in production line monitoring. Also, it is extensively used in case of miniature position control elements.

· It is very useful in linear as well as angular motion control sensing.

· It has a diverse role and applicability in dimensional gauging in case of assurance for quality control.

 

 

FAQS:

Q1: What is a miniature LVDT sensor?

Ans: It is a compact-sized LINEAR VARIABLE DIFFERENTIAL TRANSFORMER with use in small spaced objects and machinery.

Q2: What are the specialized features of miniature LVDT sensors?

Ans: It is specifically designed for tight spaces and has high performance as well as high precision in measurement. Also, it assures an exceptionally smooth static s well as dynamic response. 

The system is optimized for high bandwidth/response rate as well as resolution along with low-temperature drift. 

It has an ultra-lightweight core element. Also, the free core element has a very small size but high ruggedness. 

Q3: What are the applications of miniature LVDT sensor?

Ans: It is used in saline seawater and has submersion functions along with endurance for high pressure undersea. In addition to this, it is used as anticorrosive materials. Also, it is used in quality control for production line monitoring.

Thus it is used extensively in case of miniature position control elements.

REFERENCES:

  • Xiao, H., Lee, F. H., Yao, K., Ho, J., & Liu, Y. (2019). Miniature LVDT setup for local strain measurement on cement-treated clay specimens. Marine Georesources& Geotechnology37(5), 568-577.
  • Da Re, G., Santagata, M. C., & Germaine, J. T. (2001). LVDT based system for the measurement of the prefailure behavior of geomaterials. Geotechnical Testing Journal24(3), 288-298.
  • Witowski, M. (2018). Local displacement transducer with miniature position encoder. Geotechnical Testing Journal41(6), 1147-1154.
  • Bodnicki, M., Pakuła, P., &Zowade, M. (2016). Miniature displacement sensor. In Advanced Mechatronics Solutions (pp. 313-318). Springer, Cham.
  • Zhu, H., & Book, W. J. (2006, October). Construction and control of massive hydraulic miniature-actuator-sensor array. In 2006 IEEE Conference on Computer Aided Control System Design, 2006 IEEE International Conference on Control Applications, 2006 IEEE International Symposium on Intelligent Control (pp. 820-825). IEEE.
  •  Miniature LVDT Displacement Sensor | AML/M. (n.d.). Retrieved February 3, 2021, from lvdt.co.uk website: https://lvdt.co.uk/lvdts/miniature-lvdt-displacement-sensor-aml-m/

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