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Open AccessArticle

Side-Polished Fiber-Optic Line Sensor for High-Frequency Broadband Ultrasound Detection

1
Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
2
Department of Physics, Inha University, Incheon 22212, Korea
*
Author to whom correspondence should be addressed.
These authors equally contributed to this work.
Sensors 2019, 19(2), 398; https://doi.org/10.3390/s19020398
Received: 23 November 2018 / Revised: 7 January 2019 / Accepted: 15 January 2019 / Published: 18 January 2019
(This article belongs to the Section Physical Sensors)
We demonstrate a side-polished fiber-optic ultrasound sensor (SPFS) with a broad frequency bandwidth (dc–46 MHz at 6-dB reduction) and a wide amplitude detection range from several kPa to 4.8 MPa. It also exhibits a high acoustic sensitivity of 426 mV/MPa with a signal-to-noise ratio of 35 dB and a noise-equivalent pressure of 6.6 kPa (over 1–50 MHz bandwidth) measured at 7-MHz frequency. The SPFS does not require multi-layer-coated structures that are used in other high-sensitivity optical detectors. Without any coating, this uses a microscale-roughened structure for evanescent-field interaction with an external medium acoustically modulated. Such unique structure allows significantly high sensitivity despite having a small detection area of only 0.016 mm2 as a narrow line sensor with a width of 8 μm. The SPFS performance is characterized in terms of acoustic frequency, amplitude responses, and sensitivities that are compared with those of a 1-mm diameter piezoelectric hydrophone used as a reference. View Full-Text
Keywords: ultrasound sensor; fiber-optic sensor; optical ultrasound detector; side-polished fiber; high-frequency ultrasound ultrasound sensor; fiber-optic sensor; optical ultrasound detector; side-polished fiber; high-frequency ultrasound
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Heo, J.; Lee, K.-T.; Kim, R.K.; Baac, H.W. Side-Polished Fiber-Optic Line Sensor for High-Frequency Broadband Ultrasound Detection. Sensors 2019, 19, 398.

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