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Applications of autocollimators
The applications of autocollimators are mainly related to detection and measurement of small angular displacements.
Angle measurement of Optical Components
Measurement of wedge and deflection angle
Measurement of prisms angles
The range of applications in this field is very wide, only some fundamental set ups are presented:
45°-Angle of Prisms
The Autocollimator is directed on one side of the 90°-angle. Two images will be produced from both sides of the prism. The internal reflection within the prism will produce a displacement "d" depending on the error of the 45° angle "a":
where d is the error of 90° angle.
Measurement of deviaton angle through prisms
The autocollimator is mounted on an adjustable stand and can be tilted at any angle. A master prism is used to align the autocollimator to the mirror. The master prism is replaced by the prism under test and the angle difference is read off through the eyepiece. Example: Measurement of deviation angle through pentaprisms.
Other applications includes measurement of geometrical parameters of mechanical parts. This is a typical application in machine construction, machine tools and aerospace industry.
The measurement can be done for:
Measurement of optical parameters