High Precision 3-D Measurement System using Flying Image

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We studied this theme mainly about 4 points as follows ;1. Character analysis of the Flying Image MethodIn the case of Flying Image Method, the shape of the image-observing surface is like a cylinder. But the shape of the focal plane is flat. Because of difference of the shape of both surfaces, the barrel-shaped distortion occurs in the input image. We analyzed this barrel-shaped distortion and developed the method to correct the distortion in the input image.2. Making the Flying Image SensorWe used CCD line sensor with 2048 pixels as a photo sensor. We used also conventional camera lens (35mm/55mm). The axis of lens and line sensor is crossed in a right angle, and the axis of mirror rotation arranged on the cross point. The mirror is rotated by the stepping motor controlled by the NEC-PC9801.3. Construction of the 3-D Measuring System using Slit Light Projection Method We constructed the 3-D measuring system using Slit Light Projection Method. The System is constructed using slit light laser diode, the Flying Image sensor, and linear stage. They are fixed by L-angle steel flames. The laser slit light is projected perpendicularly down to the linear stage, and reflected light is measured to the sensor on the diagonal upper position.4.3-D Measurement ExperimentIn the first stage of the 3-D measurment, a plane that the vertical slit is drawn measured. The correction of the barrel-shaped distortion is practiced using this image.In the second stage, the carribration is practiced. We used a standard seramic block gage for the carribration and the 3-D measurement.In the final stage, the measurement is practiced. The distance from the sensor to the object is 280mm and measuring area size is 70mm*55mm. As a result, the accuracy 0.07mm is obtained.