An Adaptive Analog Circuit for LVDT&amp;#x2019;s Nanometer Measurement Without Losing Sensitivity and Range

Chen, Gang; Zhang, Chao; Liu, Pinkuan; Ding, Han

doi:10.1109/jsen.2014.2364610

Cited by 37 publications

(15 citation statements)

References 20 publications

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“…Ho wev er, they are sensitive to the wear, dust, and temp erat ure. LVDT position sensors have high accuracy with lower sensitiv it y t o the working environment [1] and [11]- [15]. They could be quite expensive and bulky because of the coils.…”

Section: Introductionmentioning

confidence: 99%

A Position Sensor With Novel Configuration of Linear Variable Differential Transformer

2021

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Th is paper presents a position sensor ba s ed o n a novel configuration of linear variable differential transform er. Design and optimization of the position sensor a re pre sent ed using finite element method. The sensor has short air core coi ls and long magnetic armatures. The arrangement direction of the re ctangular excitation coil and two antiserially connected re ctangular pick up coils is perpendicular to the motion direction of the position sensor. The coils are located be t ween two parallel silicon steel laminations a s t he a rm a t ures. Th e position sensor is optimized wi th compromise between minimization of nonlinearity error and maximum s e nsit ivi t y. The main advantage of the proposed position sensor is the small ratio of coils dimensions to the working range. The position sensor is operated for the measurements and calculations at excit at io n fre quencies, 500 Hz and 1000 Hz and 2000 Hz. The maximum nonlinearity error is less than 1.5% for theoretical analysis a nd i t i s le ss than 2% for the measurement results in ±90 mm position range.

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Section: Introductionmentioning

confidence: 99%

A Position Sensor With Novel Configuration of Linear Variable Differential Transformer

2021

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“…Transformer-type transducers can be used in many applications such as the measurement of position and displacement in industry, as well as in robotics, aircraft, electric vehicles, and scientific equipment. (4)(5)(6)(7)(8) Practically, transformer-type transducers require a sinusoidal signal as an excitation signal. The output signal of these transducers is in the form of amplitude modulation with suppressed carriers.…”

Section: Introductionmentioning

confidence: 99%

Temperature Compensation for Transformer-type Transducer

Songsuwankit¹,

Riewruja²,

Watanachaturaporn³

et al. 2021

Sensors and Materials

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“…(1)(2)(3) The LVDT is used in applications to measure displacement, which can be observed in the engineering, industrial, automotive, military, robotic, scientific, and medical equipment fields. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) The operation of the LVDT is based on the same principle as the transformer, which comprises a primary winding and two secondary windings with a moving core. (12,13) The output signal of the LVDT is the difference signal between two secondary winding signals.…”

Section: Introductionmentioning

confidence: 99%

Linear-range Extension for Linear Variable Differential Transformer Using Binomial Series

Petchmaneelumka¹,

Songsuwankit²,

Tongcharoen³

et al. 2020

Sensors and Materials

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Keywords: linear variable differential transformer, inductive transducer, linear range extension, binomial series, operational amplifier, analog multiplierThe linear-range extension technique for a linear variable differential transformer (LVDT) is described in this paper. Generally, the LVDT has a narrow linear operating range caused by its nonlinear transfer characteristic. To extend the linear operating range, the nonlinear behavior of the LVDT must be adjusted. In this paper, the circuit building block providing the LVDT inverse transfer characteristic using binomial series approximation is proposed for linearizing the nonlinear behavior of the LVDT. The third-order inverse transfer characteristic of the LVDT is synthesized from analog multipliers and a difference amplifier comprising an operational amplifier (opamp). All active devices used in this study are commercially available. Therefore, the attraction of the proposed technique is in the simple configuration and low cost, making it suitable for an embedded measurement system. The performance of the proposed technique is discussed in detail. Simulation and experimental results confirming the performance are also included. As a result, the linear range of the commercial LVDT used in this study can be extended more than 500%. The full scale error of the measured value is about 0.23% over the entire operating range.

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An Adaptive Analog Circuit for LVDT’s Nanometer Measurement Without Losing Sensitivity and Range

Cited by 37 publications

References 20 publications

A Position Sensor With Novel Configuration of Linear Variable Differential Transformer

A Position Sensor With Novel Configuration of Linear Variable Differential Transformer

Temperature Compensation for Transformer-type Transducer

Linear-range Extension for Linear Variable Differential Transformer Using Binomial Series

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