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Optical sensor for normal stress distribution

Sun, Mengyue, SUN
http://rave.ohiolink.edu/etdc/view?acc_num=akron1525432600494617

Abstract Details

2018, Master of Science, University of Akron, Polymer Science.
The adhesion strategies in biological systems have been widely studied and have been a great source of bio-inspirations for human adhesive technologies. Understanding adhesion systems depends not only on chemistry, but also on physics. The adhesive systems of geckos have many interesting properties, including controllability, self-cleaning, and ease of attachment and detachment. A large diversity of bio-inspired adhesives have been investigated in attempts to replicate these properties. For practical applications of these adhesives at macro scales, it is crucial to understand the distribution of stresses at interface of adhesive system. In this thesis, we present an optical sensor based on “frustrated total internal reflection(FTIR)” optics. In theory of FTIR, if an object is placed within less than several wavelengths distance from the interface between the first medium and the second medium, the evanescent wave will be different from the usual one, and it will pass energy across the second medium into object. According to this method, we can measure tiny deformation from soft materials such as PDMS, and calculate the tensile stress, thus this optical sensor is much more sensitive than the other biological sensors. Our sensor is composed of dove prism, 465nm blue LED light source, and several mirrors. The dove prism is used to achieve the FTIR at the interface between glass and PDMS thin film. We have made PDMS thin films by spin-coating, with thicknesses in the range of 50nm to 30µm. Upon calibration with amenable film, the sensor will be suitable for measuring the normal stress distributions under gecko feet or mussel feet
Hunter King, PhD (Advisor)
Ali Dhinojwala, PhD (Committee Member)
48 p.
Biophysics; Physics; Polymers
optics, PDMS, total internal reflection, sensor, tactile, adhesion, TIR

Recommended Citations

Citations

  • Sun, SUN, M. (2018). Optical sensor for normal stress distribution [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1525432600494617

    APA Style (7th edition)

  • Sun, SUN, Mengyue. Optical sensor for normal stress distribution. 2018. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1525432600494617.

    MLA Style (8th edition)

  • Sun, SUN, Mengyue. "Optical sensor for normal stress distribution." Master's thesis, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1525432600494617

    Chicago Manual of Style (17th edition)

akron1525432600494617
277
© 2018, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.