Hydrophones

A hydrophone is a specialized microphone designed to record and capture underwater sound. It picks up sound vibrations in the water and converts them into electrical signals, allowing them to be recorded and analyzed using appropriate equipment.

 

Hydrophones typically operate using a piezoelectric element. This element responds to changes in water pressure caused by sound waves and converts these pressure fluctuations into an electrical signal. This signal can then be processed and stored by a recorder or other suitable audio equipment. Depending on the model, various frequency ranges can be recorded.

 

Hydrophones are used for purposes such as wildlife research and bioacoustics—for instance, to record underwater sounds made by fish, frogs, whales, and dolphins. They can also be employed for acoustic research in lakes, rivers, and other bodies of water.

 

The most suitable hydrophone depends on factors such as the intended application, the desired frequency range, the recording equipment, and the conditions at the research site. Veldshop offers a range of models, including hydrophones from Aquarian Audio.

 

Several factors play a role when selecting a hydrophone. Key considerations include the frequency range, sensitivity, connector type, cable length, and maximum operating depth. The recording equipment used with the hydrophone and the type of underwater sound to be captured also determine which model is most suitable.

 

For instance, a different type of hydrophone might be required for recording sounds made by aquatic animals compared to one used for acoustic or geophysical research. Various models are available in the product range, including hydrophones from Aquarian Audio & Scientific, Frontier Labs, and Manalive Audio.

 

A hydrophone can be used to record a wide range of underwater sounds. This includes natural sounds produced by aquatic animals, such as fish, frogs, whales, and dolphins, as well as sounds from the underwater environment itself. Examples include flowing water, underwater movements, and sounds originating from vessels.

 

Many aquatic animals produce sounds for purposes such as communication, reproduction, territorial behavior, or interaction with their environment. Consequently, recording these underwater sounds is valuable for wildlife research, ecological monitoring, and bioacoustic studies. By making recordings at various times and locations, researchers can gather information on the presence and activity of animals in a specific body of water.

 

The specific sounds that can be recorded with a hydrophone depend on factors such as the model's frequency range and sensitivity. The placement of the hydrophone and the characteristics of the study site also play a role.

 

The maximum operating depth varies by hydrophone and is determined by the specific model's technical design. Therefore, when operating in deep water, it is important to check the maximum depth specified in the product details beforehand.

 

Water pressure increases as a hydrophone is submerged deeper. Consequently, the hydrophone's housing and seals must be able to withstand the pressure at the operating depth. For deep-water applications, it is important to select a model specifically designed for such conditions.

 

A hydrophone can be connected to compatible audio equipment, though the required connection varies by model. For instance, some hydrophones feature a 3.5 mm connector, while others use an XLR connector. It is therefore important to ensure the hydrophone's connector matches the recorder's available input.

 

An adapter can be used for certain combinations. The product range includes hydrophones and adapters suitable for various types of recording equipment.