Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

A capacitance pressure sensor using a phase-locked loop.

A Patel1, M Kothari, J G Webster

  • 1Department of Electrical and Computer Engineering, University of Wisconsin, Madison 53706.

Journal of Rehabilitation Research and Development
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Pharmacogenetics of codeine metabolism in an urban population of children and its implications for analgesic reliability.

British journal of anaesthesia·2002
Same author

Nitrotyrosine, inducible nitric oxide synthase (iNOS), and endothelial nitric oxide synthase (eNOS) are increased in thyroid tumors from children and adolescents.

Journal of endocrinological investigation·2002
Same author

Varicose veins possess greater quantities of MMP-1 than normal veins and demonstrate regional variation in MMP-1 and MMP-13.

The Journal of surgical research·2002
Same author

Transtracheal high frequency jet ventilation and iatrogenic injury.

British journal of anaesthesia·2002
Same author

Gallbladder disorders and type 2 diabetes mellitus--a clinic-based study.

The Journal of the Association of Physicians of India·2002
Same author

Coaxial breathing system outer tube occlusion: what goes in must come out.

Anaesthesia·2002
Same journal

Presentation Highlights: International service delivery.

Journal of rehabilitation research and development·2023
Same journal

Iraq/Afghanistan-era Veterans with back pain: Characteristics and predictors of compensation and pension award.

Journal of rehabilitation research and development·2021
Same journal

Prosthetic fitting, use, and satisfaction following lower-limb amputation: A prospective study.

Journal of rehabilitation research and development·2020
Same journal

Tongue-controlled robotic rehabilitation: A feasibility study in people with stroke.

Journal of rehabilitation research and development·2017
Same journal

Utility of a multimodal neurophysiologic assessment tool in distinguishing between individuals with and without a history of mild traumatic brain injury.

Journal of rehabilitation research and development·2017
Same journal

Efficacy of extremely low-frequency magnetic field in fibromyalgia pain: A pilot study.

Journal of rehabilitation research and development·2017
See all related articles

This study developed a novel pressure sensor system for measuring foot-shoe interface pressure. The system accurately captures plantar pressure distribution during walking and running for gait analysis and diabetic foot care.

Area of Science:

  • Biomechanics
  • Biomedical Engineering
  • Sensor Technology

Background:

  • Accurate measurement of plantar pressure is crucial for understanding gait biomechanics and managing foot conditions.
  • Existing methods may lack the spatial resolution or portability required for dynamic gait analysis.
  • Developing advanced sensor systems can improve diagnostic capabilities and therapeutic interventions.

Purpose of the Study:

  • To develop and characterize a novel capacitance-based pressure sensor system for measuring foot-shoe interface pressure.
  • To evaluate the system's performance in terms of sensitivity, nonlinearity, hysteresis, and repeatability.
  • To demonstrate the system's utility in capturing plantar pressure distribution during normal walking and running.

Main Methods:

Related Experiment Videos

  • Utilized a Hercules pressure sensor (model #F4-4R) with an interface circuit converting capacitance changes to voltage.
  • Employed a 555 timer circuit and a phase-locked loop (PLL) to translate capacitance to frequency and then to voltage (0-5 V).
  • Implemented a low-pass filter (20 Hz corner frequency) for signal conditioning and monitored pressure at 7 locations per foot using a portable data-acquisition system.

    • Main Results:

    • The sensor system demonstrated a pressure range of 0-1300 kPa with capacitance changes from 275-580 pF.
    • Key performance metrics included hysteresis (8-12%), nonlinearity (8%), nonrepeatability (7%), and temperature coefficient (-0.147%/°C).
    • System sensitivity was 2.77 mV/kPa with a temperature drift of +0.53%/°C, showing decreased spatial sensitivity towards the periphery.

    Conclusions:

    • The developed sensor system provides a reliable method for quantifying plantar pressure distribution during dynamic activities.
    • The findings support the application of this technology in gait analysis, identifying abnormal gait patterns.
    • Potential exists for using this system in sensory substitution feedback for diabetic patients with insensate feet to prevent pressure-related injuries.