Development of a Crystal-oscillator Type Water Level Meter with Optical Fibers to Secure Data Transmission and Power Supply

摘要

Measuring water levels at dams and rivers is becoming crucial for preventing disasters caused by recent abnormal weather. Some transmitters are installed more than 1 km away from an observation station, and metal communication lines are vulnerable to lightning and noise. Yokogawa has developed a crystal-oscillator type water level meter only with optical fibers, eliminating copper wiring, to secure data transmission and power supply even under severe operating conditions. This paper introduces the structure and features of this new type of water level meter.