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RSS FeedsSensors, Vol. 19, Pages 398: Side-Polished Fiber-Optic Line Sensor for High-Frequency Broadband Ultrasound Detection (Sensors)

 
 

19 january 2019 14:00:42

 
Sensors, Vol. 19, Pages 398: Side-Polished Fiber-Optic Line Sensor for High-Frequency Broadband Ultrasound Detection (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.


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13 viewsCategory: Chemistry, Physics
 
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