G - Physics – 01 – C
Patent
G - Physics
01
C
33/57
G01C 3/00 (2006.01) G01C 15/00 (2006.01)
Patent
CA 1063799
LASER LAND-SURVEYING APPARATUS WITH DIGITAL DISPLAY ABSTRACT OF THE DISCLOSURE A land-surveying apparatus for use with a laser beam source to obtain grade and range distances has a grade pole with a laser beam detection unit slidably mounted thereon, electrical measuring means being connected between the grade pole and the detection unit to generate an electrical grade signal representa- tive of the grade distance between a detector using an array of phototransistors and the base of the grade pole. A digital display unit receives the grade signal, processes it, and digitally, visibly displays the information contained in the signal. Electrical grade calculating circuitry is provided to process first and second grade signals containing the elevation of the upper and lower edges of the laser beam relative to the base of the pole and arithmetically process the signals to obtain the elevation of the laser beam center which is then displayed as the grade distance. Electrical range calculating circuitry is provided to selectively use information contained in the laser beam and generate a range output signal representing the range distance between the laser beam detector and the laser source, the range calculating circuitry delivering the range output signal to the digital display unit where the range distance is visibly, digitally displayed to the operator The digital display unit is preferably housed in a control console which is pivotally mounted to the laser beam detection unit and also detachable from the detection unit to permit an operator to hold the control console, permitting easier reading of the digital display and more convenient operation of the console when the laser beam detection unit is at an inconvenient height on the grade pole.
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