| Light collection system |
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| Light
collection system features: |
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| - | Only
slightly aspheric |
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| - | Easy
to fabricate plastic lenses |
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| - | Mold
production, cheap |
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| - | Integrated
into the support |
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| structure |
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| T(l) of the lens system, |
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| QE (l) of PMT à |
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