Low-Cost Linearity Range Enhancement for Linear Variable Differential Transformer

Prommee, Pipat; Angkeaw, Krit; Karawanich, Khunanon

doi:10.1109/jsen.2022.3142195

Cited by 12 publications

(3 citation statements)

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“…The previous works proposed in the literature [ 22 , 23 , 26 , 27 , 28 ] are referenced for comparison with the implemented proposed technique in terms of percentage error, type of signal processing, complexity of implementation, production cost, and power consumption. It should be noted that the percentage errors of the previous works [ 26 , 27 ] are achieved only from simulation results and their power consumption is dependent on the computer system and interface board being used.…”

Section: Experimental and Simulation Resultsmentioning

confidence: 99%

“…However, the LVDT used in this technique requires a special design, which is inappropriate for a commercial LVDT. There are many techniques to extend the linear measuring range without disturbing the LVDT structure [ 22 , 23 , 26 , 27 , 28 ]. The approaches for the extension of the linear measuring range using an artificial neural network are introduced [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, this technique requires precision analog multipliers to synthesize the inverse transfer characteristic of the LVDT, which requires high production cost. Additionally, the technique based on the hyperbolic tangent function to enhance the LVDT linear range is presented [ 28 ]. This technique requires two well-matched diodes and the operational amplifiers (opamp) to accurately generate the hyperbolic tangent function.…”

Section: Introductionmentioning

confidence: 99%

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Linear-Range Extension for Linear Variable Differential Transformer Using Hyperbolic Sine Function

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In this paper, a circuit technique to extend the measuring range of a linear variable differential transformer (LVDT) is proposed. The transfer characteristic of the LVDT contains the odd function form of the cubic polynomial. Therefore, the measuring range of a commercial LVDT is linear in a narrow range compared to its physical dimensions. The wide measuring range of the LVDT requires a large structure of the LVDT, which increases the scale and the cost of the measurement system. The measuring range of the LVDT can be linearly extended to the maximum of the stroke range using the proposed technique. The realization of the proposed technique is based on the use of the hyperbolic sine (sinh) function of the electronic circuit building block, named the class AB bipolar amplifier. The class AB bipolar amplifier can be obtained by the current feedback operational amplifier (CFOA). The circuit of the proposed technique requires two CFOAs and an operational transconductance amplifier (OTA) as the active devices and all devices used in the proposed technique to synthesize the sinh function are commercially available. The proposed technique exhibits an ability to compensate for the nonlinear characteristic of the LVDT without digital components. The proposed technique is attractive in terms of its simple circuit configuration, small size, and low cost. The linear range extension of the LVDT used in this paper is significantly increased with a maximum error of about 18.3 μm of 6.2 mm at the full stroke range or the full-scale percentage error of about 0.295%. The results indicate that the proposed technique provides excellent performance to extend the measuring range of the LVDT without modifying the LVDT structure.

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