Low frequency acoustic pressure meaurements based on a Fabry-Perot refractometer

Amazigh Rezki (1) , Zaccaria Silvestri (1) , Jean-Pierre Wallerand (1) , Cécile Guianvarc’h (2) , Marc Himbert (1)

1 LCM - Laboratoire commun de métrologie LNE-CNAM
2 LOMC - Laboratoire Ondes et Milieux Complexes

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

Domains: Engineering Sciences [physics]

Amazigh Rezki, Zaccaria Silvestri, Jean-Pierre Wallerand, Cécile Guianvarc’h, Marc Himbert. Low frequency acoustic pressure meaurements based on a Fabry-Perot refractometer. IMEKO, pp.1-5, 2023, ⟨10.21014/tc16-2022.008⟩. ⟨hal-03986945⟩