Direct measurement of strain rates in biological tissues

Sean J. Kirkpatrick; Donald Dean Duncan

doi:10.1117/12.388087

13 June 2000 Direct measurement of strain rates in biological tissues

Proceedings Volume 3914, Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical; (2000) https://doi.org/10.1117/12.388087
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

Abstract

A novel, imaged laser speckle strain gauge is described for directly measuring strain rates in biological tissues. Cortical bone samples were tested in tension in a custom- designed microtensile testing machine. Strain rates were evaluated simultaneously with both the laser speckle strain gauge and contact strain gauges and extensometers. Young's modulus values of the bone samples were estimated using the strain data acquired by all methods. The strain rates and modulus estimates determined through all the methods compared favorably with each other, with the modulus estimates calculated using the speckle data slightly higher than by the other methods (mean of 16.88 GPa for the speckle data vs. 13.4 GPa for the contacting methods). The speckle strain gauge has a strain resolution at least on the order of single microstrain and should prove to be useful in the mechanical evaluation of both native and engineered tissues.

Citation Download Citation

Sean J. Kirkpatrick and Donald Dean Duncan "Direct measurement of strain rates in biological tissues", Proc. SPIE 3914, Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical, (13 June 2000); https://doi.org/10.1117/12.388087

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