| 摘要 |
PROBLEM TO BE SOLVED: To provide a distance measurement method by ultrasonic wave air sensor installed in the air capable of measuring the distance to the measurement object always precisely. SOLUTION: The distance measurement method by ultrasonic wave air sensor for measuring the distance L from the ultrasonic wave sensor 4 installed in the air to the free surface of the drainage water 2 (object to be measured) based on the time from the ultrasonic wave transmitted from the ultrasonic sensor 4 and returns to the same after reflected by the free surface of the drainage water 2. The ultrasonic sensor 4 is air washed and its transmission/reception surface is dried, and after that the standard target 7 is inserted on the course of the ultrasonic waves in a known distance, then the standard distance LS from the ultrasonic sensor 4 to the target is measured. By measuring the intensity of the reflected ultrasonic waves, the contamination and the precision of the ultrasonic sensor 4 is confirmed, then, the distance L is measured. COPYRIGHT: (C)2005,JPO&NCIPI |
