A side scan sonar
is a sonar
device that can look sideways. This can be compared with a radar, but uses ultrasound
echoes instead of electromagnetic pulses. The sound pulses are usually on frequencies between 100 and 500 kHz. A higher frequency gives better resolution but less range.
This technique was developed by Professor Harold Edgerton[?] and ohters in the 1960s. It is commonly used for wreck search in underwater archaeology.
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