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Optical fiber based heterodyne interferometry for non-invasive and non-contact oil viscosity measurement
Author(s): Jonghyun Eom; Ji Yeon Choi; Anjin Park; Joo Beom Eom
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Paper Abstract

We describe a non-invasive and non-contact viscosity measurement system using a compact optical fiber heterodyne interferometry. The proposed system consists of a fiber based pulse laser for surface acoustic wave (SAW) excitation and a lensed fiber for probing laser. When the pulsed laser illuminates onto the oil surface, the SAW is generated by photoacoustic effect and it propagates along the surface. The interference of probing laser reflected on the sample surface has the information of the surface movement. We can calculate the propagation velocity of SAW from the detected interference signal. The propagated SAW contains the information of liquid properties (viscosity and elasticity). For the preliminary measurements, an industrial engine oil and a polydimethylsiloxane (PDMS) are used. We can measure the viscosity of them without noncontact, successfully.

Paper Details

Date Published: 11 April 2019
PDF: 7 pages
Proc. SPIE 11028, Optical Sensors 2019, 110282B (11 April 2019); doi: 10.1117/12.2521482
Show Author Affiliations
Jonghyun Eom, Korea Photonics Technology Institute (Korea, Republic of)
Ji Yeon Choi, Korea Photonics Technology Institute (Korea, Republic of)
Anjin Park, Korea Photonics Technology Institute (Korea, Republic of)
Joo Beom Eom, Korea Photonics Technology Institute (Korea, Republic of)


Published in SPIE Proceedings Vol. 11028:
Optical Sensors 2019
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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