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Sensors 2019, 19(3), 614;

Low-Frequency Vibration Sensor with a Sub-nm Sensitivity Using a Bidomain Lithium Niobate Crystal

Department of the Materials Science of Semiconductors and Dielectrics, National University of Science and Technology MISiS, 119049 Moscow, Russia
Department of Physics and I3N, University of Aveiro, 3810-193 Aveiro, Portugal
Author to whom correspondence should be addressed.
Received: 27 December 2018 / Revised: 18 January 2019 / Accepted: 30 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Sensors Based on Piezoelectric Materials)
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We present a low-frequency sensor for the detection of vibrations, with a sub-nm amplitude, based on a cantilever made of a single-crystalline lithium niobate (LiNbO3) plate, with a bidomain ferroelectric structure. The sensitivity of the sensor-to-sinusoidal vibrational excitations was measured in terms of displacement as well as of acceleration amplitude. We show a linear behavior of the response, with the vibrational displacement amplitude in the entire studied frequency range up to 150 Hz. The sensitivity of the developed sensor varies from minimum values of 20 μV/nm and 7 V/g (where g = 9.81 m/s2 is the gravitational acceleration), at a frequency of 23 Hz, to peak values of 92.5 mV/nm and 2443 V/g, at the mechanical resonance of the cantilever at 97.25 Hz. The smallest detectable vibration depended on the excitation frequency and varied from 100 nm, at 7 Hz, to 0.1 nm, at frequencies above 38 Hz. Sensors using bidomain lithium niobate single crystals, as sensitive elements, are promising for the detection of ultra-weak low-frequency vibrations in a wide temperature range and in harsh environments. View Full-Text
Keywords: lithium niobate; bidomain crystal; vibration; sensor lithium niobate; bidomain crystal; vibration; sensor

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Kubasov, I.V.; Kislyuk, A.M.; Turutin, A.V.; Bykov, A.S.; Kiselev, D.A.; Temirov, A.A.; Zhukov, R.N.; Sobolev, N.A.; Malinkovich, M.D.; Parkhomenko, Y.N. Low-Frequency Vibration Sensor with a Sub-nm Sensitivity Using a Bidomain Lithium Niobate Crystal. Sensors 2019, 19, 614.

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