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A crystal microphone that responds to waterborne sound waves.



Related Terms

CRYOGENIC TRANSFORMER

A transformer crystal cartridge control microphone to convert sound waves into af signals.

CRYSTAL MICROPHONE

A microphone in which deformation of a piezoelectric bar by the action of sound waves or mechanical vibrations generates the output voltage between the faces of the bar. Also known as piezoelectric microphone.

DECIBEL

Unit of sound pressure or power. Abbreviation is 'dB'. 1 Watt of sound power is equal to 120 dB.

THERMO ACOUSTICAL EFFICIENCY

Equal to the sound power level/heat release. A value used to characterize the amount of combustion noise emitted from a flame. Defined as the ratio of the acoustical power emitted from the flame to the total heat release of the flame. Approximately equal to 1 X 10-6 for premixed and turbulent flames and equal to 1 X 10-9 for diffusion and laminar flames.

BLAST

A sound signal made with the whistle of the vessel

GENERAL EMERGENCY ALARM

A sound signal of seven short blasts and one long blast given with the vessel ́s sound system

AIRBORNE SOUND

Sound which reaches the point of interest by radiation through the air.

ACOUSTIC

A term pertaining to sound, or the science of sound.

AMBIENT NOISE

The normal sound in a room or other location.

FLASHBACK

A phenomenon occurring only in pre-mix gas burners when the flame speed overcomes the gas-air mixture flow velocity exiting the gas tip. The flame rushes back to the gas orifice and can make an explosive sound when flashback occurs. Flashback is most common when hydrogen is present in fuel gas.

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