I have to measure the particle velocity of sound waves in water. Which instrument to use to measure particle velocity of a sound in a specific direction. I searched but I find some anemometer setups for velocity measurements. I think they are all water flow measurement methods. Is there any difference between water flow speed measurement and particle velocity measurement of sound in water? If not I can use the anemometer setup. I asked this same question in General physics but no response(may be the was wrong place to ask). Thanks in advance.