A comparison of fits and clearances for Cassegrain shutter models current under study, using beam en...
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Spherical Mask Shutter assembly PowerPoint PPT Presentation


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A comparison of fits and clearances for Cassegrain shutter models current under study, using beam envelopes for ‘Scientifically useable’ light developed from Mike Lampton’s TMA-65 Ray Traces. Spherical Mask Shutter assembly. Modified spherical Mask Shutter Assembly. Flat Mask shutter Assembly.

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Spherical Mask Shutter assembly

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Spherical mask shutter assembly

A comparison of fits and clearances for Cassegrain shutter models current under study, using beam envelopes for ‘Scientifically useable’ light developed from Mike Lampton’s TMA-65 Ray Traces

Spherical Mask Shutter assembly

Modified spherical Mask Shutter Assembly

Flat Mask shutter Assembly

Robin Lafever 27 May 2004


Tma 65

TMA-65

Robin Lafever 27 May 2004


Tma 65 cassegrain focus

TMA-65 Cassegrain Focus

Robin Lafever 27 May 2004


Detailed beam envelope

Detailed Beam Envelope

Detector assembly

43.16 mm pitch

Spherical Mask

At the Cassegrain focus

Beam envelope constructed from

Mike Lampton’s Ray Traces

Generic Fold-Flat mirror

With “scientifically useable” light footprint

Tertiary mirror

Robin Lafever 27 May 2004


Spherical mask shutter assembly closed

Spherical Mask Shutter assemblyClosed

‘Stovepipe’ Baffle Assembly

Robin Lafever 27 May 2004


Spherical mask shutter assembly open

Spherical Mask Shutter assemblyOpen

‘Stovepipe’ Baffle Assembly

Open shutters interfere with beam envelope

Robin Lafever 27 May 2004


Spherical mask shutter assembly closed1

Spherical Mask Shutter assemblyClosed

Robin Lafever 27 May 2004


Modified spherical mask shutter assembly closed

Modified spherical Mask Shutter AssemblyClosed

Shutter blades and motors

Moved up near knife blade

Robin Lafever 27 May 2004


Spherical mask shutter assembly open1

Spherical Mask Shutter assembly Open

Robin Lafever 27 May 2004


Modified spherical mask shutter assembly open

Modified spherical Mask Shutter AssemblyOpen

‘Stovepipe’ Baffle Assembly

Robin Lafever 27 May 2004


Modified spherical mask shutter assembly open1

Modified spherical Mask Shutter AssemblyOpen

Open shutters clear

the beam envelope

Robin Lafever 27 May 2004


Modified spherical mask shutter assembly closed1

Modified spherical Mask Shutter AssemblyClosed

Robin Lafever 27 May 2004


Modified spherical mask shutter assembly open2

Modified spherical Mask Shutter AssemblyOpen

Robin Lafever 27 May 2004


Flat mask shutter assembly open

Flat Mask shutter AssemblyOpen

‘Stovepipe’ Baffle Assembly

Robin Lafever 27 May 2004


Flat mask shutter assembly closed

Flat Mask shutter AssemblyClosed

‘Stovepipe’ Baffle Assembly

Robin Lafever 27 May 2004


Flat mask shutter assembly open1

Flat Mask shutter AssemblyOpen

Innermost corners of the mask knife edges

Are at the Cass focus.

Robin Lafever 27 May 2004


Flat mask shutter assembly closed1

Flat Mask shutter AssemblyClosed

Robin Lafever 27 May 2004


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