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 RONAR-SMITH®
LASER OPTICS & IR IMAGING
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Design
of Pressure Window
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Minimum thickness of a window required to withstand a pressure differential can be calculated by the following formula:
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Th =
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Th = thickness, inches
DIA = unsupported diameter, inches
P = pressure differential, psi
MR = modulus of rupture, psi
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Modulus of rupture (MR, psi) of commonly used crystals:
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Crystals
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MR,
psi
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BaF2
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3,900
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CaF2
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5,300
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CdTe
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3,200
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CsI
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820
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Fused
Silica
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7,000
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GaAs
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20,000
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Ge
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10,500
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KBr
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160
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KCl
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340
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KRS-5
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4,000
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LiF
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1,600
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MgF2
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7,200
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NaCl
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350
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Sapphire
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65,000
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Si
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18,100
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ZnSe
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8,000
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ZnS
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14,900
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ZnS
Cleartran
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8,700
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