“The standoff distance between the hydrophone and polystyrene plate was 0.5 mm for the excimer and ruby lasers.”

“The hydrophone array detected an unusual shape, which, following data processing and analysis, was determined to be a shipwreck.”

“These units have been constructed in-house using commercial hydrophone and geophone elements.”

“Seismic waves are detected by instruments known as geophones when used on land or hydrophones in water.”

“Research using sonograms, hydrophones, and other acoustical devices have shown that that these whales produce two sounds termed A or B calls.”

“Shot points occur every 10-15 seconds, and after each one the hydrophones record a 24-bit signal every two milliseconds.”