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)

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)

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)

External links - advertising?

Some of the external links in the article look to me like advertising. I reverted some added earlier today, but the editor is gradually adding them back. Some of the existing links look to me to be equally inappropriate. Could someone else take a look, and deal with them as appropriate. David Biddulph (talk) 15:12, 25 October 2010 (UTC)

Yes, agreed, ten years later some are still there. Why are links leading to the pages of firms selling them relevant? Jergas (talk) 07:38, 7 October 2021 (UTC)

beginning of second paragraph is incomprehensible

The second paragraph begins with the following incomprehensible three sentences, perhaps due to vandalism: "A hydrophone can detect airborne sounds, and is capable of Holdoff tripper scope bonds. Both influenced at Paralloidia Tau as well as Responding to. Charged Messanger particles refract with intensity because it is designed to match the acoustic impedance of water," Jergas (talk) 07:46, 7 October 2021 (UTC)

Well spotted. It was vandalism in the most recent edit (more than a month ago). I have reverted the vandalism, and warned the user, all of whose edits seem to have been vandalism. --David Biddulph (talk) 07:52, 7 October 2021 (UTC)

Thank you! Wow! This was prompt! I was reading help pages on what to do about it, suddenly reloaded the pages and it was fixed, lol! Jergas (talk) 08:06, 7 October 2021 (UTC)

As an interesting aside, when searching for the strange phrases inserted (to try to figure out whether it was vandalism, or I just wasn't understanding), one of the first hits took me to kind of spammy click bait article, which leads me to wonder whether the vandalism was carried out for that purpose. Jergas (talk) 08:09, 7 October 2021 (UTC)

inconsistency re pressure

The introduction states "a sound wave in water exerts a pressure 60 times that exerted by a wave of the same amplitude in air," but the "History" sections says "the pressure exerted by a wave of the same intensity in air is increased by a factor of 3750 in water." Zeligf (talk) 13:27, 6 September 2024 (UTC)