Handheld magnetic sensor for measurement of tension

K. Singal, R. Rajamani

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


This letter develops an analytical formulation for measurement of tension in a string using a handheld sensor. By gently pushing the sensor against the string, the tension in the string can be obtained. An experimental sensor prototype is constructed to verify the analytical formulation. The centimeter-sized prototype utilizes three moving pistons and magnetic field based measurements of their positions. Experimental data show that the sensor can accurately measure tension on a bench top rig. The developed sensor could be useful in a variety of orthopedic surgical procedures, including knee replacement, hip replacement, ligament repair, shoulder stabilization, and tendon repair.

Original languageEnglish (US)
Article number154105
JournalApplied Physics Letters
Issue number15
StatePublished - Apr 9 2012

Bibliographical note

Funding Information:
This work was supported in part by funding from the Institute for Engineering in Medicine (IEM), University of Minnesota and by the National Science Foundation.


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