| 摘要 |
PROBLEM TO BE SOLVED: To measure distance fluctuations between two points with sufficient measurement accuracy even when there are heterogenities such as an ocean current, a water mass, and a vortex between two points at the bottom of the sea, which are objects of distance measurement. SOLUTION: A sound source system 10 and a measurement processing system 20 are installed on the top surface of a sea side plate 16 and the bottom of the sea of a land side plate 22, respectively. A first acoustic probe wave is sent from the sound source system to the measurement processing system. In response, an acoustic phase conjugate wave is sent from the measurement processing system back to the sound source system and is stored as a standard probe wave. A second acoustic probe wave is then sent from the sound source system to the measurement processing system. In response, a plurality of acoustic modulation phase conjugate waves are sent from the measurement processing system back to the sound source system sequentially in order of the size of the amount of phase modulation and are generated as measurement probe waves, respectively. These measurement probe waves and the standard probe wave are sequentially allowed to interfere with each other to generate an interference wave. The amount of fluctuations in the distance between the sound source system and the measurement processing system is determined through the amount of phase modulation minimizing the amplitude of the interference wave. COPYRIGHT: (C)2007,JPO&INPIT
|
