| 摘要 |
In an ultrasonic water level measuring device using ultrasonic waves, multiple detectors (6) for measuring a water level using ultrasonic waves are installed. The water level is measured by calculating a distance value using the transmission/reception time difference and speed of the ultrasonic waves transmitted and received through the detectors (6) because the detectors (6) are managed according to channels (C1, C2..., and Cn). In order for efficient management, the present invention can perform the batch control of the multiple detectors (6) by outputting various frequency bands with one converter (4) because the water level is constantly maintained by entering or discharging water using a pump operated by a controller when the measured water level escapes from a preset water level range. Accordingly, the present invention can reduce maintenance costs when the device is malfunctioned. The frequency bands are narrowed by utilizing a digital filter type instead of an analog filter type. Also, the present invention can increase measurement precision because unnecessary noise contained in reception signals is reduced. [Reference numerals] (10) Transformer; (12) Output control unit; (14) Control operation unit; (16) Image display unit; (18) Key control unit; (20) Ultrasonic transmission unit; (22) Level reception unit; (24) Ultrasonic transmission/reception conversion control unit; (32) Ultrasonic transmission/reception synchronization unit; (6) Detector; (8) Power supply unit |
