投影仪测量误差发生的启事及其对策(国外英文资料).docVIP

投影仪测量误差产生的原因及其对策(国外英文资料) The cause of the measuring error of the projector and its countermeasures Shu-gang wang The error of the projector is mainly caused by the imaging quality of the projection screen and the measurement errors of the workbench. Magnification error (optical system error) 1. The reason Is mainly due to the optical lens and optical components in the process of design in the process of processing and manufacturing, due to improper assembly lens focusing error and aberration caused a great influence on measurement accuracy. The focal length error of the objective directly affects the magnification. Aberration of optical system including color, spherical aberration, coma makes, astigmatism, distortion and field, these will affect the image quality, especially the distortion and field will cause like a piece of distortion and outline. Countermeasures for 2. Mm projection error because of magnification view illumination is not homogeneous, suggests that the filament is not located at the focal plane of the condenser, destroyed the telecentric lighting conditions, thus caused by the focusing error due to power changes. When the magnification of the mm projection is repaired, the source of the lamp must be adjusted. If the filament is a bad thread, however, it should be replaced by a light bulb. In addition to the lack of adjustment of the lamp source, it is possible that the lens may be loose or adjustable reflector. First, adjust the source of the lamp and tighten the objective. If the magnification is still present, it can be determined by the movement of the adjustable reflector. Now the new sky projector JT5 is an example. Will be adjustable mirror at the top of the cover plate, adjusting the adjustable mirror behind the four screws, make the mm scribed line as in a clear and parallel to the screen points under the condition of line change distance, meet the right magnification. Turning the three small screws around and turning into one of the big