Abstract: A magnetic sensor for borehole magnetometer includes an upper-opened pipe-shaped housing; a frame installed at an inside of the housing; an upper-opened magnetic sensor part installed at a bottom side of the frame; a lid covering the opened upper side of the magnetic sensor part; and a magnetic sensor disposed at an inside of the magnetic sensor part to measure a magnetic force, wherein an upper side and a bottom side of the magnetic sensor is respectively installed with a spring, a bottom side of the lid and the magnetic sensor part are formed with a fixing groove for fixing an upper spring and a bottom spring each installed at an upper side and a bottom side of the magnetic sensor.

Abstract: A magnetic sensor for borehole magnetometer includes an upper-opened pipe-shaped housing; a frame installed at an inside of the housing; an upper-opened magnetic sensor part installed at a bottom side of the frame; a lid covering the opened upper side of the magnetic sensor part; and a magnetic sensor disposed at an inside of the magnetic sensor part to measure a magnetic force, wherein an upper side and a bottom side of the magnetic sensor is respectively installed with a spring, a bottom side of the lid and the magnetic sensor part are formed with a fixing groove for fixing an upper spring and a bottom spring each installed at an upper side and a bottom side of the magnetic sensor.

Abstract: Provided is a pressure-balanced underwater acoustic transducer. The transducer includes an oscillator unit having an oscillator oscillating by an electrical signal supplied to electrodes, provided on its surface, a sound transmission material for transmitting sound from the oscillator, provided at its periphery, and a transducer housing provided at the exterior of the sound transmission material, a sound reflector positioned over the oscillator unit, for reflecting sound propagated from the oscillator, a water entry layer formed at a space between the oscillator unit and the sound reflector to allow water to enter and exit to the rear window of the oscillator, thereby leading to a balanced state of pressures applied to the front and rear windows of the oscillator, and a phase combiner for combining sound reflected from the sound reflector and straight traveling sound generated from the front window of the oscillator into one single phase.

Abstract: Provided is a pressure-balanced underwater acoustic transducer. The transducer includes an oscillator unit having an oscillator oscillating by an electrical signal supplied to electrodes, provided on its surface, a sound transmission material for transmitting sound from the oscillator, provided at its periphery, and a transducer housing provided at the exterior of the sound transmission material, a sound reflector positioned over the oscillator unit, for reflecting sound propagated from the oscillator, a water entry layer formed at a space between the oscillator unit and the sound reflector to allow water to enter and exit to the rear window of the oscillator, thereby leading to a balanced state of pressures applied to the front and rear windows of the oscillator, and a phase combiner for combining sound reflected from the sound reflector and straight traveling sound generated from the front window of the oscillator into one single phase.