Impedance matching circuit for the mercury strain gauge

Elsner, Robert; Eagan, C. J.; Andersen, Svend Ib Smidt

doi:10.1152/jappl.1959.14.5.871

Cited by 13 publications

(1 citation statement)

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“…Mercury has a high intrinsic conductivity. The typical impedance of the mercury gauge varies from a few ohms to a fraction of an ohm, which results in long gauge lengths (cm), small resistance variations and problems of mismatch with strain-gauge amplifiers [3,4]. Worse, mercury is poisonous and not allowed for medical application.…”

Section: Introductionmentioning

confidence: 99%

An ionic liquid based strain sensor for large displacement measurement

Keulemans

Ceyssens

Puers

2017

Biomed Microdevices

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A robust and low cost ionic liquid based strain sensor is fabricated for high strain measurements in biomedical applications (up to 40 % and higher). A tubular 5 mm long silicone microchannel with an inner diameter of 310 µm and an outer diameter of 650 µm is filled with an ionic liquid. Three ionic liquids have been investigated: 1-butyl-1-methylpyrrolidinium bis (trifluoromethylsulfonyl) imide, ethylammonium nitrate and cholinium ethanoate. When the channel is axially stretched, geometrical deformations change the electrical impedance of the liquid channel. The sensors display a linear response and low hysteresis with an average gauge factors of 1.99 for strains up to 40 %. Additionally, to fix the sensor by surgical stitching to soft biological tissue, a sensor with tube clamps consisting of photopatternable SU-8 epoxy-based resin is proposed.

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Section: Introductionmentioning

confidence: 99%