BYU

Abstract by Francisco Irarrazabal

Personal Infomation


Presenter's Name

Francisco Irarrazabal

Degree Level

Masters

Abstract Infomation


Department

Physics and Astronomy

Faculty Advisor

Kent Gee

Title

Infrasonic microphone calibration project

Abstract

This work describes the phase and amplitude correction of 12.7 mm diameter, Type-1 microphones in the infrasound region using measured noise field of a large rocket motor. The data stem from acoustic intensity measurements using two-dimensional, four-microphone probe. Althought the calibration processing is well-known, obtaining the necessary transfer functions in the infrasound regime is challenging because signal-to-noise ratio are often low, large recordings are required, and microphones mismatch are significantly variable across these low frequencies. Far-field measurements of a large static rocket test provide the enough energy to perform the calibration. The performance of the calibration method, including limitations, for different microphones responses and probe configurations is presented.