Hand held electronic grading level

Details Hand held electronic grading level Hand held electronic grading level

1990-11-07

1991-10-29

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367910, 367108, G01S 1500

Patent

active

050620878

ABSTRACT:
A hand held electronic grading level which automatically and accurately calculates the grade of a ground plane and indicates whether said grade is level. The grading level comprises a telescopic site level and a sonar system that is coupled to a microelectronically controlled calculator and a digital read out display. The sight level permits the grading level to be aligned horizontally with a distant sight target. The sonar system then generates an acoustic pulse which is reflected off the ground plane and received at a detector. The elapsed time between the transmission and receipt of the acoustic pulse provides an indication of the vertical elevation from the gorund plane to the sonar system. This elevation is displayed and compared to the known elevation of the distant sight target. The deviation between the shot and known elevations is also displayed to indicate the actual grade of the ground plane and whether said ground plane is level.

REFERENCES:
patent: 4730190 (1988-03-01), Win et al.

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