PURPOSE: To obtain the titled instrument with high accuracy by inputting a value measured with an ultrasonic range finder and a vertical range finder to an arithmetic unit and calculating it.
CONSTITUTION: This instrument 6 consists of the ultrasonic range finder 3, the vortical range finder 1 and the arithmetic unit 5. Then, the range finder 3 consists of an emitter to emit ultrasonic waves 4 in the air, a receiver to receive the reflected waves, and an equipment to measure and transmit a time interval of transmission and reception and the distance from acoustic velocity to the sea ice surface 8, namely, the sea ice surface position 10. Further, as to a method to measure the distance to the sea water surface 7, namely, the sea water surface position 9 by the range finder 1, a primary coil 20 and secondary coils 21 and 22 are arranged in the air and a high-frequency electric current is flowed in the primary coil 20 and an alternating field 2 is generated and a phase angle of the voltage causing on the secondary coil 21 at this time is measured and the sea water surface position 9 is measured based on this. A value deducting the sea ice surface position 10 from the sea water surface position 9 measured in this way by the arithmetic unit 5 is the thickness 11 of the sea ice.
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NARITA HIDEAKI
ISHIHARA KOJI
YAMADA KOJI
MORI TOSHIHIRO
