What would be the best type of signal for an underwater device.
For Example: If there was a waterproof Electronic Device and a waterproof wireless remote control for this device what would be the best type of wireless signal technology (such as: bluetooth, ultra sound...) for this device?
2007-09-02 18:45:21 · 3 answers · asked by MaKaVeLi 1 in Science & Mathematics ➔ Engineering
The first two answers are correct. Sound waves propagate well underwater from very low frequencies, below audio, right up to very high ultrasonic frequencies of a few hundred KHz. The only other way to communicate underwater is ELF (extremely low frequency) radio, below 30 KHz. This is very expensive and requires very long aerials. It is used for Omega communication with nuclear subs. It works worldwide. Ultrasonic sound waves carry much more information; with data compression they could even give you video, but the range is no more than about 100 km; Cetaceans like whales use sound waves up to a few km. At a depth of a few hundred metres there's an ocean layer called the SOFAR channel which can channel sound waves a bit further than this, but seven Omega stations cover the globe.
2007-09-02 20:03:06 · answer #1 · answered by zee_prime 6 · 1⤊ 0⤋
Bluetooth (or any other form of RF radiation) simply won't propagate under water. The best bet is ultrasonics (ultrasound) in the range of 30KHz to 100KHz. Also, it's best to use some form of digital modulation (rather than AM or FM) since there will be much less distortion.
HTH
Doug
2007-09-02 19:10:41 · answer #2 · answered by doug_donaghue 7 · 2⤊ 0⤋
Acoustics but consider a wire tether.
Far more reliable than any unwired control possibilities. High data rate which would be important if you have data (esp video) coming back from the device
2007-09-02 21:22:17 · answer #3 · answered by zydecojudd 3 · 0⤊ 0⤋