MEASUREMENT METHOD FOR FLATNESS DEVIATION Russian patent published in 2009 - IPC G01B11/30 

FIELD: physics.

SUBSTANCE: invention relates to flatness measurement technique and deviation determination at flat surfaces with different square area and length, in particular for testing, installation and marking-off plates made of cast iron or stone. Invention can be used in different areas of engineering. Effect is reached due to emission of horizontal collimated laser beam by measurement instrument with stationary installed emitting device; receiver contains optical target sign with cross and vernier installed at vertical measurement scale with feature of motion in vertical plane. In the beginning real horizontal auxiliary plane is created by laser beam turning; level of this plane is fixed against readings of linear scale and vernier received at receiver adjustment against optical axis of emitter by means of alignment of optical target cross with central point of collimated laser beam. Readings of linear scale and vernier received during such alignment are accepted as zero mark for further setting and measurement. Then moving receiver without realignment to at least two outermost points located at work surface of plate and aligning cross of receiver's optical target sign with central point of emitter's collimated laser beam by means of vertical regulation of plate level in each of these points work surface of plate is set in parallel to horizon and to auxiliary plane and measurements of flatness deviation are made in received system of two mutually aligned real parallel surfaces by means of plate sections movement into leveling points of receiver only and determination of vertical deviation for cross of target sign to one or another side from auxiliary surface level against linear scale and vernier of receiver.

EFFECT: setting of real horizontal auxiliary plane, accurate setting of basic plane in parallel to auxiliary plane and horizon and obtainment of mutually aligned system to make adjustments and measurements based on these two planes really parallel to each other.

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