The dangers facing Chinese white dolphin from marine traffic off south and west Lantau and around Sokos were examined by a WWF-Hong Kong underwater sound study conducted between April and June A total of nine underwater sound recorders collected Chinese white dolphin whistles, dolphin and finless porpoise echolocation clicks and feeding buzzes, as well as vessel noise within the study area. A hydrophone is an underwater microphone connected to a waterproof, rechargeable and portable recorder that can record for two minutes every 10 minutes, for up to 1. The hydrophones we use are specifically designed to cover a wide frequency range — from the very high frequency clicks of finless porpoise to the very low frequency sound of fish chorus and cargo noise. The data is downloaded, followed by recharging the device before it is placed underwater again on the stand, ready for the next recording. Hydrophone data reflect the amount of time cetaceans spend in the area and their behavioral patterns at each deployment location. The acoustic information collected allows us to map potential dolphin foraging and socializing hotspots, as well as significant porpoise foraging habitat see picture on the right. Here are some sample data of the hydrophone taken at night. The spectrogram is a sound frequency profile showing all noise signals recorded.
DolphinPhone Sounds
Instrumentation for Underwater sound and Bioacoustics
CRT offers both hydrophones and hydrophone systems. CR2 hydrophones are not individually calibrated, but calibrated frequency response measurements can be performed for an additional fee. The hydrophones are powered by one 9V battery not included or an optional long-life rechargeable, external power supply. Scroll To Top. Hydrophones overview of all models Custom orders gladly accepted such as gain or bandwidth modifications. Center for Bioacoustics, Univ. SQH1B General purpose hydrophone ideal for kayaking, whale watching and full audio-band signal detection; can also be used as a contact microphone or low cost geophone CR1 series Excellent multi-purpose non-preamplified hydrophones - great for the detection and recording of both very loud signals and the quieter sounds of cetaceans and other underwater sources CR2 Ideal for the detection and recording of extremely loud signals.
The Hydrophone is waterproof up to meters about feet - however the waterproof cable provided is only 33ft and is rugged enough to handle oceanic conditions and water pressures. With this hydrophone, you can record various sounds such as underwater animals and wildlife. The hydrophone can be used in the following environments: Bodies of water lakes, rivers, oceans, etc Underground buried in soil Ice frozen into liquids Swimming pools. This hydrophone can be used in various liquids. Please get approval from Media Loan staff prior to use in potentially hazardous liquids. It was designed with unique large aperture MPC piezo-electric element that responds to sound pressure variations over a wide dynamic range. It is completely encased in a special epoxy casing, which makes it far more rugged than most other under-water microphone designs. This hydrophone is fitted with a standard 3-pin XLR connector.
The DE series of personal handheld hydrophones have found their way into hundreds of different applications. These personal hydrophones come as a complete set — hydrophone, integral cable, headphone amplifier, earbud- stye earphone, battery, instructions and bonus software to record sounds and display spectrograms on your PC in real time or back at your office. While the software is not needed to operate the DE, it does turn your PC into a powerful sound analysis tool. So whether you are trying to identify the unique vocalizations of an individual whale or dolphin, or monitoring the sound levels emitted by underwater construction, the DE is the ideal solution. It provides high levels of quality audio without the need for phantom power and the problems that can cause in an aquatic environment.
