An ultrasonic sensor for a construction implement is disclosed which provides an indication of the position of the sensor relative to a reference surface in two dimensions. In a preferred embodiment of the invention, a pair of sensors are positioned a predetermined distance from one another to transmit and receive ultrasonic waves to measure the time it takes the waves to travel to the reference surface and be reflected back to the ultrasonic transducers. Additionally, a transducer is disclosed which detects a side lobe of a acoustic wave transmitted by an acoustic transducer whereby the velocity of said acoustic pulse may be calculated.
申请公布号
DE4204481(A1)
申请公布日期
1992.10.29
申请号
DE19924204481
申请日期
1992.02.14
申请人
LASER ALIGNMENT, INC., GRAND RAPIDS, MICH., US
发明人
NIELSEN, EDWARD G., GRAND RAPIDS, MICH., US;STOEPKER, ROSS C., KENTWOOD, MICH., US;LITTY, FRED D., GRAND RAPIDS, MICH., US