Abstract:
The invention relates to checking or calibrating the angle-dependent alignment of a reference structure on a high-precision test-piece. A device comprises a plinth, and a retainer piece, rotatably mounted about a retainer piece axis, for retaining the test-piece and a measuring piece with a measuring piece bearing unit, to rotationally mount the measuring piece, about a measuring piece axis. An optical unit is mounted on the measuring piece, for receiving at least one test-piece beam, interacting with the reference structure on the test piece, running essentially in a measuring plane. The measuring piece bearing unit is arranged on the measuring plane or to one side thereof. The measuring piece includes a base that is, for example, axially symmetrical with the measuring piece axis encompassing or surrounding the intersection of the measuring piece axis with the retainer piece axis and hence also encompasses or surrounds the test-piece.
Abstract:
A measurement system that can self calibrate is disclosed. The measurement system comprising a first light source directed along a first axis and configured to illuminate a sample volume. The measurement system has a sensor aligned along a second axis and is configured to detect scattered light in the sample volume. The measurement system has a second light source aligned along the second axis that is configured to illuminate the sensor during a calibration procedure.
Abstract:
A method of making a standard tool for calibrating polarimeters that analyze stress in photoelastic material, includes the steps of partially annealing a starting piece of tempered glass so that the starting piece has a retardance below 250 nm/cm, removing a peripheral portion of the starting piece (preferably, at least about 20% of its radial dimension) to leave a working piece, cutting a rectangular parallelepiped from the working piece, polishing two opposing faces of the rectangular parallelepiped where the two opposing faces are spaced apart by a measurement distance through which light passes during stress analysis in a polarimeter, and determining a birefringence of the rectangular parallelepiped across the measurement distance using a calibrated polarimeter. The standard tool is the rectangular parallelepiped having the determined birefringence for the measurement distance. The method can be used to make a set of the standard tools with different measurement distances.
Abstract:
A photodetector includes a light emitting portion for applying light, a light receiving portion for sensing the light, and a light guiding member 3 for guiding the light from the light emitting portion to a surface to be measured and guiding detection light from the surface to be measured to the light receiving portion. The light guiding member has a sheet-like optical transmission medium, which is disposed at a portion facing to the surface to be measured and transmits the light by internal reflection. The sheet-like optical transmission member has an optical aperture facing to the surface to be measured.
Abstract:
A measuring system including a measuring device with a laser tracker and an opto-electronic sensor having fixed positions relative to one another and an auxiliary measuring tool with a reflector and at least three light spots, is calibrated. The auxiliary measuring tool is rigidly coupled with an arrangement of auxiliary reflectors and is moved around at least two different rotation axes. Reflector and auxiliary reflectors are registered by the laser tracker and the light spots are registered by the opto-electronic sensor. From the data of the laser tracker, positions and orientations of the reflector arrangement relative to the laser tracker and from the data of the opto-electronic sensor, positions and orientations of the light spot arrangement relative to the opto-electronic sensor are calculated and the two rotation axes relative to the reflector arrangement and the light spot arrangement are calculated. Calibration data are calculated by equating corresponding rotation axes.
Abstract:
A reference substrate for defect detection sensitivity calibration has: patterns and programmed defective portions which are cone defects with different sizes and are formed at random on a silicon substrate. By using reference substrate for defect detection sensitivity calibration, it is possible to obtain an index, usable in manufacturing management, for determining sensitivity adjustment after a lamp is replaced in an illumination part of a defect inspection apparatus.
Abstract:
A system and method are disclosed for calibrating a hard disc drive magnetic head flying height tester by a calibration standard, which includes a mock slider and mock disc, by optical interference techniques.
Abstract:
A system and method are disclosed for calibrating a hard disc drive magnetic head flying height tester by a calibration standard, which includes a mock slider and mock disc, by optical interference techniques.
Abstract:
A standard plane sample which supplies an optical characteristic measuring device with reference data. The standard plane sample including a sample portion that is measured by the optical characteristic measuring device to supply measurement data, and a recording medium that stores identification data for identifying a kind of the sample portion as well as reference data corresponding to the optical characteristic of the sample portion.