An understanding of combustion resonance phenomena requires information as to the nature of the acoustic field within the combusion zone. This paper describes a probe capable of surveying such a field and tells how it can be used in the study of high amplitude sounds. The design employs a microphone which measures the sound level near one end of a very long small bore tube in which reflections may be neglected. The bulk of the work involves the measurement of the damping coefficient of high‐amplitude sounds in tubes. A convenient way to calculate the damping coefficient α was examined. This involved dividing α into two parts. Thus,α=αK+αp, where αKis Kirchoff damping coefficient due to viscous effects and αpis damping coefficient of unconfined sawtooth waves. Good agreement between calculated and measured values of α was obtained. A sample survey of pressure amplitude distribution across the flame zone of a screeching combustor is given.