The Rasnik 3-point optical alignment system

Journal article (2019)

Authors

M. Beker Nikhef, Innoseis B.V.
G. Bobbink Nikhef
B Bouwens Amsterdam Scientific Instruments, Amsterdam
N. Deelen Nikhef
P. Duinker Nikhef
J. Van Eldik Nikhef, CERN
N. De Gaay Fortman Student, Nikhef
R. Van Der Geer Nikhef, GoDataDriven
H. van der Graaf Nikhef, RST/Neutron and Positron Methods in Materials - AS
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Research Group
RST/Neutron and Positron Methods in Materials (AS) (TU Delft)
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Published Date

2019

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Neutron and Positron Methods in Materials

Abstract

The Rasnik alignment system was developed initially in 1983 for the monitoring of the alignment of the muon chambers of the L3 Muon Spectrometer at CERN. Since then, the development has continued as new opto-electronic components become available. Rasnik systems are 3-point optical displacement monitors and their precision ranges from below nanometers to several micrometers, depending on the design and requirements of the systems. A result, expressed in the range/precision ratio of 2 × 106, is presented. According to the calculations of the Cram'er-Rao limit, and by means of MonteCarlo simulations, a typical Rasnik image should have enough information to reach deep sub-nanometer precision. This paper is an overview of the technological developments and achievements since Rasnik was applied in high energy physics experiments.

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