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Miniature ferroelectret microphone design and performance evaluation using laser excitation
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Svilainis, Linas, Chaziachmetovas, Andrius, Eidukynas, Valdas, Alvarez-Arenas, Tomas Gomez and Dixon, Steve M. (2022) Miniature ferroelectret microphone design and performance evaluation using laser excitation. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 69 (12). pp. 3392-3401. doi:10.1109/tuffc.2022.3220082 ISSN 1525-8955.
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WRAP-Miniature-ferroelectret-microphone-design-performance-evaluation-laser-excitation-22.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (3037Kb) | Preview |
Official URL: https://doi.org/10.1088/1361-6544/ac9f9d
Abstract
Miniature microphones suitable for measurements of ultrasonic wave field scans in air are expensive or lack sensitivity or do not cover the range beyond 100 kHz. It is essential that they are too large for such fields measurements. The use of a ferroelectret (FE) film is proposed to construct a miniature, needle-style 0.5-mm-diameter sensitive element ultrasonic microphone. FE has an acoustic impedance much closer to that of air compared with other alternatives and is low cost and easy to process. The performance of the microphone was evaluated by measuring the sensitivity area map, directivity, ac response, and calibrating the absolute sensitivity. Another novel contribution here is that the sensitivity map was obtained by scanning the focused beam of a laser diode over the microphone surface, producing thermoelastic ultrasound excitation. The electroacoustic response of the microphone served as a sensitivity indicator at a scan spot. Micrometer scale granularity of the FE sensitivity was revealed in the sensitivity map images. It was also demonstrated that the relative ac response of the microphone can be obtained using pulsed laser beam thermoelastic excitation of the whole microphone surface with a laser diode. The absolute sensitivity calibration was done using the hybrid three-transducer reciprocity technique. A large aperture, air coupled transducer beam was focused onto the microphone surface, using the parabolic off-axis mirror. This measurement validated the laser ac response measurements. The FE microphone performance was compared with biaxially stretched polyvinylidene difluoride (PVDF) microphone of the same construction.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
| SWORD Depositor: | Library Publications Router | |||||||||
| Library of Congress Subject Headings (LCSH): | Thin films , Microphone -- Design, Ultrasonics | |||||||||
| Journal or Publication Title: | IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control | |||||||||
| Publisher: | Institute of Electrical and Electronics Engineers (IEEE) | |||||||||
| ISSN: | 1525-8955 | |||||||||
| Official Date: | 4 November 2022 | |||||||||
| Dates: |
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| Volume: | 69 | |||||||||
| Number: | 12 | |||||||||
| Page Range: | pp. 3392-3401 | |||||||||
| DOI: | 10.1109/tuffc.2022.3220082 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||
| Date of first compliant deposit: | 5 December 2022 | |||||||||
| Date of first compliant Open Access: | 5 December 2022 | |||||||||
| RIOXX Funder/Project Grant: |
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