Talk:Hydrophone

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does anyone know how hydrophones actually convert sound into energy?

It's my understanding that hydrophones commonly use piezoelectric devices (eg. quartz) that convert mechanical deformation into voltage. Cruise332 00:45, 8 October 2007 (UTC)

- There are a few types of hydrophone design, peizoelectric ceramics have reduced the costs in recent years. The ceramics generate electricity when squeezed by the sound pressure wave. Although quite small, this voltage can be amplified. Ceramics will have a frequency responce, usually linked to the thickness, and will be directional depending on the form. If a flat ceramic plate is used the diameter of the plate reletive to the sound wavelenth will give the directionality. If you want to try to make a simple hydrophone here are some instructions hydrophone kit

It is also possible to apply an ac voltage across the ceramic and cause a corresponding pressure wave (sound). —Preceding unsigned comment added by Elprc1 (talk • contribs) 07:08, 9 October 2007 (UTC)

[edit] Added link to piezoelectricity article

I think the link is the most efficient way to provide details re transducer physics. My understanding is that most hydrophones use crystals (natural or synthetic) and ceramics... I'll add your kit link to the external links... —Preceding unsigned comment added by Scottveirs (talk • contribs) 19:15, 16 October 2007 (UTC)

[edit] Vector sensors

Vector sensors (integrating accelerometers with conventional pressure sensors) represent a third type of directional hydrophone. The article "Underwater acoustic communication" contains a detailed description, with references. Psalm 119:105 (talk) 14:26, 2 January 2009 (UTC)