The Köster’s interferometer for gauge block length measurements

Download

index.pdf

Date

2007

Author

Şendoğdu Çuhadar, Damla

Metadata

Show full item record

Item Usage Stats

157
views

30
downloads

This thesis describes the design, construction and testing of a new interferometer for the absolute measurement of length standards. It is assumed that this study mainly formed of three parts. Firstly, it starts with an introduction to the subject of length standards and length measurement by interferometry. The design of the new interferometer is given in detail, including the stable lasers used as light sources, fiber, optical and opto-mechanical components. In the second part of this study, the mechanical construction of the interferometer chamber is presented with temperature stabilization and controlling system. The temperature variations inside the chamber at different points in air and along the surface of the length standard are given. After that, the techniques for measurement of the refractive index of the air inside the interferometer chamber are summarized. In the last part of the thesis, a review of fringe analysis techniques is given, with an emphasis on 5 position phase-stepping algorithms. The data processing of images digitized in the interferometer is described, including the techniques developed for discontinuity removal and surface fitting. The measurement of the variation in length and flatness of the measuring faces of the length standards is described and the experimental results are given. The automated method of multiple wavelength-exact fractions is used to combine phase measurements at three wavelengths to allow accurate calculation of the length of the length standards. The experimental results are given for length standards. The uncertainty budget of whole system is calculated and presented in a table.

Subject Keywords

Physics., Meterological Instruments.

URI

http://etd.lib.metu.edu.tr/upload/12608987/index.pdf
https://hdl.handle.net/11511/17248

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Performance of CMS hadron calorimeter timing and synchronization using test beam, cosmic ray, and LHC beam data Chatrchyan, S.; et. al. (IOP Publishing, 2010-03-01) This paper discusses the design and performance of the time measurement technique and of the synchronization systems of the CMS hadron calorimeter. Time measurement performance results are presented from test beam data taken in the years 2004 and 2006. For hadronic showers of energy greater than 100 GeV, the timing resolution is measured to be about 1.2 ns. Time synchronization and out-of-time background rejection results are presented from the Cosmic Run At Four Tesla and LHC beam runs taken in the Autumn ...
A 35 GHz coplanar waveguide power divider Gürbüz, Ozan Doǧan; Topalli, Kagan; Ünlü, Mehmet; Demir, Şimşek; Akın, Tayfun (2010-12-20) This text presents the design and measurement of a power divider topology implemented using coplanar waveguides by micromachining technology. The power divider is a three port structure. For simple three port power divider structures significant modifications are needed for changing power division ratio. For the proposed one in this paper the ratio can be adjusted by changing only the lengths of shunt stubs included in the structure. The design is at 35 GHz and the implementation is done by coplanar wavegui...
An induction motor design tool combining analytical and field solution techniques Ertan, Hulusi Bülent; Avenoglu, B (2001-01-01) This paper first describes a software (TPCAD) for the design and optimization of induction motors. Then, a macro developed to transfer the geometry of the lamination designed by TPCAD to field solution software is described. In this manner, the designed motor model is quickly established within the field solution software. Hence, the tedious field solution model preparation phase is omitted from the design procedure. The approach described takes advantage of analytical tools to optimize a design for a speci...
Multi-Layered. Simulation Architecture: A Practical Approach Topcu, Okan; Oğuztüzün, Mehmet Halit S. (2011-09-28) This paper presents a practical approach to design federate architectures by applying a well-known architectural style-layered architecture. Applying the layered architecture to specify the architecture of an HLA-based simulation provides a good separation of concerns, which are the interface, the simulation logic, and the HLA-specific communication. Thus, the layered simulation architecture allows the simulation developers to focus on each concern separately and gives them the freedom to implement each lay...
Ellipsometric and uv-vis transmittance analysis of amorphous silicon carbide thin films Gülses, Ali Alkan; Katırcıoğlu, Bayram; Department of Physics (2004) The fundamentals of the ellipsometry are reviewed in order to point out the strengths and weaknesses of the ellipsometric measurements. The effects of the surface conditions (such as degree of cleanliness, contaminated thin layer, roughness etc_) on the ellipsometric variables are experimentally studied; the optimum procedures have been determined. Hydrogenated amorphous silicon carbide (a-Si1-xCx:H) thin films are produced by plasma enhanced chemical vapor deposition (PECVD) technique with a circular react...

Citation Formats

D. Şendoğdu Çuhadar, “The Köster’s interferometer for gauge block length measurements,” Ph.D. - Doctoral Program, Middle East Technical University, 2007.