This paper presents an instrument based on an equal-arm Michelson interferometer and a frequency-stabilized helium-neon laser. It is designed to record hydrosphere pressure variations in the frequency range from 0 (conventionally) to 1000 Hz, with accuracy of 0.24 mPa at sea depths of up to 50 m. The operating range of the instrument can be increased by order of magnitude by improving the registration system speed, and accuracy can be enhanced by using larger diameter membranes and/or their smaller thickness. The paper demonstrates some experimental results obtained on the supersensitive detector of hydrosphere pressure variations, confirming its high performance in the infrasonic and sonic ranges.
In article the description of bottom station is resulted, basic measuring device is laser-interference hydrophone. Laser-interference hydrophone is created on a basis Michelson interferometer of equal-arm type. As a light source in interferometer the semi-conductor laser is used. A sensitive element of a laser hydrophone is the round membrane which is included in system «cat's eye ».
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