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Entry  Tue May 1 03:12:58 2012, frank, tara, DailyProgress, Acoustics, acoustic enclosure for input beam IMG_0849.jpg
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Message ID: 950     Entry time: Tue May 1 23:58:21 2012     In reply to: 948     Reply to this: 951
Author: frank, tara 
Type: DailyProgress 
Category: Acoustics 
Subject: acoustic enclosure for input beam 

We added the lid on top of the enclosure. More work is needed to complete the box.

    We made the closing lids by cutting a 1/8" acrylic panel. A strip of soft foam was added between the frame and the lids to form a seal.

    We did a qualitative test by placing a white noise source inside the box and listening. The aluminum bubble wrap we used did not provide good noise reduction. So we replaced one side by a plastic piece (~1/8" thick) with a damping pad on. It could damp the noise pretty well. I'll borrow a blue bird microphone from Den tomorrow, so we can measure the TF or just the relative noise signal to check how much attenuation we get from our structure.

 

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