A successive approximation type direct displacement to digital converter suitable for a floating-wiper inductive displacement sensor is proposed here. The topology of a successive approximation type digital converter (SADC) is suitably altered so that a floating-wiper inductive displacement sensor becomes an integral part of the SADC. The successive approximation logic results in the final digital output directly proportional to the displacement of the floating wiper. The hardware and logic are so designed that the final digital output is independent of the interfering inputs. The results obtained from simulation studies establish the efficacy of the proposed technique. © 2017 IEEE.

Aparna Mohan

Sivaprakasam Mohanasankar

Vignesh Jagadeesh Kumar

Approximation theory

Computer circuits

Frequency converters

DIGITAL CONVERTERS

DIGITAL OUTPUT

INDUCTIVE DISPLACEMENT SENSORS

INDUCTIVE VOLTAGES

NON-CONTACT

SELF-BALANCING

Simulation studies

Successive approximations

INDUCTIVE SENSORS

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IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

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IIT Madras

Proceedings of the International Conference on Sensing Technology, ICST

A novel read-out circuitry for Linear Variable Differential Transformers (LVDT) is presented in this paper. The proposed method avoids the use of low distortion sine wave oscillators for primary excitation and the associated phase compensation circuitry. The read-out circuit uses the secondary coil of an LVDT as part of a Colpitts oscillator along with a frequency counter to derive the position information. The proposed method also utilizes ratiometric computation for better linearity. Results of the measurements carried out for the proposed oscillator based read-out circuit are comparable to those obtained from commercially available LVDT signal conditioners. The measurements provide an accuracy of 12 bits over a 26 mm range with an update rate in excess of 4 kS/s, and a linearity error of +/- 0.17% of the Full Scale (FS). © 2017 IEEE.

I2MTC 2017 - 2017 IEEE International Instrumentation and Measurement Technology Conference, Proceedings

A simple and efficient oscillator based read-out scheme for LVDT

A noncontact inductive type displacement sensor is presented here. The sensor is realized with an inductive voltage divider possessing a floating wiper operated by a self-balancing feedback type signal conditioning circuit. The output of the self-balancing signal conditioning circuit is: 1) linear to the displacement of the floating wiper and 2) independent of the coupling capacitance that arises due to the air gap between the inductive element and the floating wiper. Error analysis and simulation studies presented here bring out the pitfalls that have to be avoided to obtain an optimal design for linear or angular displacement sensing. Experimentation on an emulated sensor and results obtained from a prototype angle sensor built and tested establish the efficacy of the proffered technique. © 1963-2012 IEEE.

IEEE Transactions on Instrumentation and Measurement

Self-Balancing Signal Conditioning Circuit for a Novel Noncontact Inductive Displacement Sensor

A novel, floating wiper, inductive voltage divider (IVD) type displacement transducer is presented here. A self balancing signal conditioning circuit, proposed herein, operates on an IVD with a floating wiper and provides an output that is proportional to the displacement (can be linear or angular) of the wiper. The output is made independent of the coupling capacitor that would arise due to the air gap between the inductive element and the floating wiper. Thus the output of the proffered transducer is unaffected by any jitter that may occur and alter the distance between the wiper and the IVD. The workability of the proposed transducer is extensively verified through simulation studies. © 2016 IEEE.

Conference Record - IEEE Instrumentation and Measurement Technology Conference

A floating wiper inductive voltage divider type displacement transducer

Sensors

A Differential Monolithically Integrated Inductive Linear Displacement Measurement Microsystem

IEEE Sensors Journal

An Inductive Angular Displacement Sensor Based on Planar Coil and Contrate Rotor

2009 Third International Conference on Sensor Technologies and Applications

Inductive Displacement Sensor for Force Measuring in Humanoid Robotic Application: Testing the Invariance on Angular Displacement

Successive approximation type digital converter for floating-wiper inductive displacement sensor

Journal	Data powered by TypesetProceedings of the International Conference on Sensing Technology, ICST
Publisher	Data powered by TypesetIEEE Computer Society
ISSN	21568065
Open Access	No