| 摘要 |
<p>PURPOSE:To save the labor for digging the ground and effectively judge a stratum by transmitting ultrasonic waves to the ground with a ultrasonic wave transmitter, and judging the stratum via the returning wavelength. CONSTITUTION:The judgment of a stratum is a key for constructing a building, however it takes labor to specially dig the ground. Ultrasonic waves 3 are transmitted to the ground 4 with a ultrasonic wave transmitter 1, the stratum is judged by the returning wavelength, and the distance to the base rock can be detected. The labor for digging the ground is saved, and the stratum can be effectively judged.</p> |
