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Vol. 32, No. 8(2), S&M2292

ISSN (print) 0914-4935
ISSN (online) 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
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Sensors and Materials, Volume 30, Number 10(1) (2018)
Copyright(C) MYU K.K.
pp. 2171-2181
S&M1667 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2018.1816
Published: October 12, 2018

Linear Variable Differential Transformer Temperature Compensation Technique [PDF]

Wandee Petchmaneelumka, Pitsini Mano, and Vanchai Riewruja

(Received November 27, 2017; Accepted March 12, 2018)

Keywords: LVDT, temperature compensation, inductive transducer, analog circuit design

A feedback technique to compensate for the temperature effect on the output signal of the linear variable differential transformer (LVDT) without losing the sensitivity is presented in this paper. The proposed technique is based on the use of a voltage-controlled amplifier to scale the amplitude of the excitation signal for temperature compensation. The proposed feedback technique provides the proportional-plus-integral control action to minimize the error caused by the temperature variation. The proportional-plus-integral action is realized using the integral scheme in the proposed technique. The peak amplitude of the LVDT output signal is sampled by the sample-and-hold circuit (SHC) to obtain the feedback and displacement signals, where the control signal of the SHC is provided by the LVDT output signal. The proposed LVDT temperature compensation technique is emphasized in terms of simple configuration and low cost. Note that the proposed technique is suitable for signal conditioners embedded in smart sensors and smart materials. The performance of the proposed technique is confirmed by experimental implementation using commercially available devices. The maximum error of the core displacement signal can be reduced from 6.52% for the uncompensated scheme to 0.098% for the compensated scheme at the ambient temperature of 70 ℃.

Corresponding author: Wandee Petchmaneelumka


Cite this article
Wandee Petchmaneelumka, Pitsini Mano, and Vanchai Riewruja, Linear Variable Differential Transformer Temperature Compensation Technique, Sens. Mater., Vol. 30, No. 10, 2018, p. 2171-2181.



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