A novel DSP-based LVDT signal conditioner

Ralph M. Ford; Robert S. Weissbach; David R. Loker

doi:10.1109/19.930452

A novel DSP-based LVDT signal conditioner

Ralph M. Ford, Robert S. Weissbach, David R. Loker

School of Engineering (Behrend)

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

A novel signal conditioning system for linear variable differential transformers (LVDTs) is presented. This system considers the signals involved in the operation of the LVDT to be analogous to a double sideband suppressed carrier AM (DSBSC-AM) communication system, where the position information is akin to the signal to be transmitted and the input sine wave excitation to the LVDT is akin to the carrier wave. Signal conditioning is achieved through a modified digital signal processor-based Costas receiver. This system has better dynamic response than existing solutions and better noise rejection than commercially available solutions. Static testing of the system using both 4-wire and 5-wire LVDTs verifies that the conditioner meets or exceeds the linearity performance of existing signal conditioning systems over the full-scale operating range. In addition, this system requires no phase compensation network or manual tuning.

Original language	English (US)
Pages (from-to)	768-773
Number of pages	6
Journal	IEEE Transactions on Instrumentation and Measurement
Volume	50
Issue number	3
DOIs	https://doi.org/10.1109/19.930452
State	Published - Jun 2001

All Science Journal Classification (ASJC) codes

Instrumentation
Electrical and Electronic Engineering

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10.1109/19.930452

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abstract = "A novel signal conditioning system for linear variable differential transformers (LVDTs) is presented. This system considers the signals involved in the operation of the LVDT to be analogous to a double sideband suppressed carrier AM (DSBSC-AM) communication system, where the position information is akin to the signal to be transmitted and the input sine wave excitation to the LVDT is akin to the carrier wave. Signal conditioning is achieved through a modified digital signal processor-based Costas receiver. This system has better dynamic response than existing solutions and better noise rejection than commercially available solutions. Static testing of the system using both 4-wire and 5-wire LVDTs verifies that the conditioner meets or exceeds the linearity performance of existing signal conditioning systems over the full-scale operating range. In addition, this system requires no phase compensation network or manual tuning.",

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AB - A novel signal conditioning system for linear variable differential transformers (LVDTs) is presented. This system considers the signals involved in the operation of the LVDT to be analogous to a double sideband suppressed carrier AM (DSBSC-AM) communication system, where the position information is akin to the signal to be transmitted and the input sine wave excitation to the LVDT is akin to the carrier wave. Signal conditioning is achieved through a modified digital signal processor-based Costas receiver. This system has better dynamic response than existing solutions and better noise rejection than commercially available solutions. Static testing of the system using both 4-wire and 5-wire LVDTs verifies that the conditioner meets or exceeds the linearity performance of existing signal conditioning systems over the full-scale operating range. In addition, this system requires no phase compensation network or manual tuning.

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A novel DSP-based LVDT signal conditioner

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