Barcode for measurement and its measuring instrument

Abstract

A bar code for measurement and the measurer, every code element consisting of a pair of light and shade fringe, the width of code element is fixed value, the boundary position of code element is fixed, the light an dshade code element representing zero code in binary, the opposite phase code of said code element representing 1 code in binary, the zero and 1 code arranged according to conventional rule and forming the bar code for measurement.

Description

technical field [0001] The technology belongs to the technical field of surveying and mapping instrument manufacturing. Background technique [0002] At present, the decoding principles of digital electronic level mainly include correlation method, geometric method and phase method. The typical representative of the decoding principle of the correlation method is the Swiss Leica instrument, and the external feature is that the scale is directly encoded in binary code; the typical representative of the decoding principle of the geometric method is the Trimble instrument, and the external feature is that the scale adopts two-phase binary code; the phase method decoding principle Typical representatives are the patents of TOPCON of Japan: 93121271.5, 01137724.0 and the patent of SOKKIA of Japan 98104318.6. The external feature is that the scale barcode is composed of several groups of codes with different cycle sinusoidal modulation code sequences; RAB principle, patent No. 98...

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Problems solved by technology

[0004] In 2004, I invented a proportional modulation code-carrying phase method principle 200410061193.8 that changes the proportional relationship of the proportional code to realize encoding and decoding. Although this method has achieved excellent performance such as greatly simplifying the instrument design process and quick measurement, but because of the existence of various proportional relationships The code unit, the stripes are generally narrow, and it is difficult for the telescope to distinguish the narrow stripes with too narrow width at a long distance, which is not conducive to the improvement of the maximum line-of-sight ratio index of the measurement. It has been proved by practice that the suitable line-of-sight range for normal measurement is 2.5 meters to 85 meters At the same time, there are relatively too many types of light and dark stripes on the yardstick, which is not conducive to the design and manufacture of the yardstick

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