LOW FREQUENCY ACOUSTIC PRESSURE MEAUREMENTS BASED ON A FABRY PEROT REFRACTOMETER

A. Rezki, Z. Silvestri, J-P. Wallerand, C. Guianvarc’h, M. Himbert

Abstract

This paper presents the development, the operating principle, and the experimental results of an innovative technique for the measurement of acoustic pressures in the range of 40 mHz up to 5 Hz. This new measurement technique is based on the use of a Fabry Perot refractometer in which the air density variations related to an acoustic wave can be tracked and determined by measuring the optical frequency variations of a laser locked on a longitudinal mode of the Fabry Perot cavity. This approach covers a wider range in the low and infrasonic frequencies compared to conventional sensors.

Keywords

Fabry Perot; infrasonic pressure; refractometry; optical microphone; opto-acoustic sensor

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IMEKO-TC16-2022-008.pdf

DOI

10.21014/tc16-2022.008

IMEKO TC

TC16 - Pressure and Vacuum Measurement

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