Heterodyne interferometer for absolute amplitude vibration measurements with femtometer sensitivity | Zendy

Erlend Leirset | Zendy; Helge E. Engan | Zendy; Astrid Aksnes | Zendy

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Heterodyne interferometer for absolute amplitude vibration measurements with femtometer sensitivity

Author(s) -

Erlend Leirset,

Helge E. Engan,

Astrid Aksnes

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.019900

Subject(s) - interferometry , optics , acoustics , transducer , heterodyne (poetry) , vibration , ultrasonic sensor , amplitude , dynamic range , bandwidth (computing) , physics , noise floor , signal (programming language) , materials science , noise measurement , telecommunications , noise reduction , computer science , programming language

A heterodyne interferometer for highly sensitive vibration measurements in the range 100 kHz - 1.3GHz is presented. The interferometer measures absolute amplitude and phase. The signal processing of the setup is analyzed and described in detail to optimize noise suppression. A noise floor of 7.1 fm/Hz(1/2) at 21 MHz was achieved experimentally where the bandwidth is the inverse of all time needed for filter settling and signal sampling. To demonstrate the interferometer, measurements up to 220 MHz were performed on arrays of capacitive micromachined ultrasonic transducers (CMUTs). The measurements provided detailed information e.g. about the frequency response, vibration patterns and array uniformity. Such measurements are highly valuable in the design process of ultrasonic transducers.

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