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Beam Pattern Measurements of Baffle and Integrating Sphere for the Development of the SAFARI AIV Calibration Source

Klandermans, P.S. (2013) Beam Pattern Measurements of Baffle and Integrating Sphere for the Development of the SAFARI AIV Calibration Source. Master's Thesis / Essay, Physics.

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Abstract

This master research consisted of measuring beam patterns of test setups which represented different parts in the SAFARI calibration source. Measurements were done to see mhow a baffle influences the beam of a hot source (in this research replaced by a globar) and the power received by the input port of an integrating sphere. It was found that there is a smooth transition between the maximum power received by the input port and when the beam gets truncated. Diffraction effects are not a problem. The relation between power in the input port and diaphragm radius is found to be P = P0(1 −xp(−2r2/w02)), with w0 = 2.2 mm. The integrating sphere is part of the second research topic of this research. It is investigated, with measurements and models in the ray tracing program ZEMAX, what the surface roughness needed to be to get a homogeneous beam output with variations less than 1%. A smooth integrated sphere with only specular reflections was tested, which did not result in a homogeneous beam output. A rough integrating sphere, with rms σ=20 μm , was not a Lambertian scatterer for all wavelengths around 10 μm. It was also found that the transmssion was too low, which resulted in noise in the output signal of the integrating sphere. In the end it was not managed to find a right surface roughness with the measurements of ZEMAX. Nevertheless the rough integrating sphere gave a more homogeneous output.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:54
Last Modified: 15 Feb 2018 07:54
URI: http://fse.studenttheses.ub.rug.nl/id/eprint/11241

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