A laser tracking interferometer system developed by us is capable of measuring the coordinates of a target retroreflector. In this system, a self-calibration algorithm is used to determine system parameters such as the arrangement of laser trackers and the initial lengths of interferometers. The self-calibration algorithm is a least-squares method, hence in the algorithm a residue of measurement results is evaluated as a criterion of convergence. The relationship between the measurement error and the arrangement of the laser trackers was experimentally investigated. On the basis of these investigations, a new definition of the residue used in the self-calibration algorithm is proposed.
A simple instrument for measuring edge angles is proposed, in which a light sectioning method is introduced. It has the advantage of simplicity, and consequently provides easy operation and an inexpensive instrument. A specimen is tilted in parallel planar laser beams. V-shaped lines are drawn by the laser beams on both sides of the specimen and are observed through a microscope. The tilt angle of the specimen can also be measured by the parallel planar laser beams. The edge angle can be calculated from the observed apex angle of the V-shaped lines and the tilt angle of the specimen. Measurement error factors are analysed and the measurement result is compensated. The measurement error of the instrument is estimated to be about an average and in variance after compensation. Although the instrument is capable of measuring the edge angles of many kinds of object, it is most suitable for measuring the edge angles of knives. The accuracy of this novel instrument may be sufficient for the quality control of knives.
We developed a noble instrument for the edge angle measurement utilizing light-sectioning method. This instrument utilizes two parallel sheeted light beams for illumination and acquires two shifted edge profiles as an image data. The object edge is placed under those beams in a slanted position to have a clear view from the perpendicular direction of the light sheets. This slant angle is a direct factor for the measurement. The knives has a variated shapes and their edge lines are not always straight, and so, it is difficult to set the object knives to a fixed slant angle. Both slant angle and edge angle are measured using an auto-correlation and a cross-correlation technique on the images. The detail of image analysis technique is presented in this paper.
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