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Specifications
Tianjin EastLong Opto-electronic Measuring & Control Technology Co., Ltd. is a hi-tech enterprise located within Tianjin BinhaiMeasureing Principle ? |
| The parallel beam emitted from the light source of long service life shines onto the measured object via optical lens. Through receiving lens, the measured profile forms a projection image of external profile on high-resolution CCD camera (able to differentiate 0.005% variation in visual field). With extremely high-speed electronic shutter (0.0001 second), CCD will shoot the width of this projection (i.e. diameter) and send it to the computer for analysis and calculation. The advantage of the imaging measurement is that it can obtain clearly-profiled size at the same moment and on the same section by extremely high-speed shooting. With 8 or 10 groups of basic measuring units distributed on the same plane by an interval of 22.5 or 18, we can quickly measure the profile size of an object on the same section. This measurement forms approximate complete round section of circumscribed hexadecagon or icosagon. Among the domestic and foreign diameter measuring instruments, the Model GDC-JB.X.L is the only equipment that can truly measure the profile size of the screw steel, rod and wire at the same moment and on the same section. This invention has been awarded patent in China. |
| Relation between Circumscribed Hexadecagon and Inscribed Circle |
| Shown on right is a circumscribed hexadecagon which is formed by measuring the round steel with 8 groups of parallel beam. It can be seen that it is approximate to a complete section. The area where two beams cross is insensitive area (It is insensitive other than it cannot be measured. Even the most insensitive point —11.25o protrusion can be measured, as long as it is larger than 0.98% of the diameter), where the measuring error is also very small. On actual production line, the measured object always has a specific angle of rotation. As long as the radial rotation of the measured object is over 5o, the measuring error will be less than 0.3% of the diameter. Therefore, this measuring method eliminates the “blind area”, while the measuring error for protrusion defect will not be over 0.98% of the diameter at highest, generally not over 0.3% of the diameter. With high-speed measuring method for same moment and same section, we can obtain data volume of the sectional shape 100 times more than the rotary measuring method and (2000~6000) times more than the swing measuring method. |
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