LASER-INTERFERENCE METER OF PRESSURE GRADIENT IN LIQUID Russian patent published in 2017 - IPC G01N21/45 

FIELD: measuring equipment.

SUBSTANCE: laser-interference meter of pressure gradient in liquid refers to the field of measuring equipment and can be used in hydroacoustics to measure the pressure gradient of the hydrosphere. The device is a cylindrical housing made of stainless material, inside which there are two systems for external pressure compensation, a recording system and an optical system based on two Michelson interferometers, including two sources of monochromatic radiation, two movable reflectors and two fixed ones. Mirrors mounted on dual piezoceramic transducers connected with the recording system are used as the fixed reflectors, and membranes with a light-reflecting coating, which centres are located on one axis, are used as the movable reflectors. The membranes are equipped with external pressure compensation systems and are installed on opposite sides of the housing. The recording system generates output signals and controls interferometers. The gradient is obtained by subtracting the signal obtained at one interferometer from the signal obtained at the other one.

EFFECT: expanded dynamic range, increased accuracy of measurements, reduced temperature dependence and extended lower limit of the operating frequency range.

6 cl, 1 dwg