An Umbilical Data-Acquisition System for Measuring Pressures between the Foot and Shoe

Hongsheng Zhu; Nabil Maalej; John G. Webster; Willis J. Tompkins; Paul Bach-Y-Rita; Jacqueline J. Wertsch

doi:10.1109/10.58601

An Umbilical Data-Acquisition System for Measuring Pressures between the Foot and Shoe

Hongsheng Zhu, Nabil Maalej, John G. Webster, Willis J. Tompkins, Paul Bach-Y-Rita, Jacqueline J. Wertsch

Physics

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

50 Scopus citations

Abstract

We have developed an umbilical data-acquisition system for measuring pressures between the foot and shoe during walking. It consists of pressure sensors in the insoles of shoes, amplifier circuits, umbilical cables, an analog-to-digital converter, and a graphics display card in an IBM PC for real-time data collection and display. The applied pressure on a sensor decreases its resistance, which causes the output voltage of the amplifier circuit to increase. We attach seven sensors to the surface of each insole of a pair of extra-depth shoes and calibrate all the sensors in the insole before and after each test using a load cell as a reference. The IBM PC samples the outputs from the sensor and the load cell and stores a piecewise linear lookup table for use in compensation for the nonlinearity of the sensor. On the PC's graphics display, two programs provide displays of foot pressures as real-time bar graphs or as analog pressure versus time curves.

Original language	British English
Pages (from-to)	908-911
Number of pages	4
Journal	IEEE Transactions on Biomedical Engineering
Volume	37
Issue number	9
DOIs	https://doi.org/10.1109/10.58601
State	Published - Sep 1990

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title = "An Umbilical Data-Acquisition System for Measuring Pressures between the Foot and Shoe",

abstract = "We have developed an umbilical data-acquisition system for measuring pressures between the foot and shoe during walking. It consists of pressure sensors in the insoles of shoes, amplifier circuits, umbilical cables, an analog-to-digital converter, and a graphics display card in an IBM PC for real-time data collection and display. The applied pressure on a sensor decreases its resistance, which causes the output voltage of the amplifier circuit to increase. We attach seven sensors to the surface of each insole of a pair of extra-depth shoes and calibrate all the sensors in the insole before and after each test using a load cell as a reference. The IBM PC samples the outputs from the sensor and the load cell and stores a piecewise linear lookup table for use in compensation for the nonlinearity of the sensor. On the PC's graphics display, two programs provide displays of foot pressures as real-time bar graphs or as analog pressure versus time curves.",

author = "Hongsheng Zhu and Nabil Maalej and Webster, {John G.} and Tompkins, {Willis J.} and Paul Bach-Y-Rita and Wertsch, {Jacqueline J.}",

note = "Funding Information: Manuscript received June 13, 1988; revised December 18, 1988. This work was supported by Contract Number V695-P2906 from the Rehabilitation Medicine Service, Veterans Administration Medical Center, Milwaukee, WI 53295. H. Zhu, N. Maalej, J. G. Webster, and W. J. Tompkins are with the Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI 53706. P. Bach-y-Rita is with the Department of Rehabilitation Medicine, University of Wisconsin, Madison, WI 53792. J. J. Wertsch is with Rehabilitation Medicine Service, Veterans Administration Medical Center, Milwaukee, WI 53295. IEEE Log Number 9036846.",

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N1 - Funding Information: Manuscript received June 13, 1988; revised December 18, 1988. This work was supported by Contract Number V695-P2906 from the Rehabilitation Medicine Service, Veterans Administration Medical Center, Milwaukee, WI 53295. H. Zhu, N. Maalej, J. G. Webster, and W. J. Tompkins are with the Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI 53706. P. Bach-y-Rita is with the Department of Rehabilitation Medicine, University of Wisconsin, Madison, WI 53792. J. J. Wertsch is with Rehabilitation Medicine Service, Veterans Administration Medical Center, Milwaukee, WI 53295. IEEE Log Number 9036846.

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An Umbilical Data-Acquisition System for Measuring Pressures between the Foot and Shoe

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