Spherical and hyperhemispherical domes, cowls

Protective windows shaped as spherical domes are used to solve some specific problems. Usually, the domes are used in devices operating under high pressure, with high velocities of incoming air or liquid flows. According to their configuration, the hoods can be smaller than hemispheric, hemispheric and hyperhemispheric.

Depending on the spectral range of the device they protect, the domes can be made of various materials:

glasses for the visible range;
quartz for ultraviolet, visible and near infrared range;
sapphire (artificial corundum) for ultraviolet, visible, near and mid-wave infrared;
germanium and zinc selenide - for the long-wave infrared range.

The choice of material also depends on the operating conditions.

For harsh operating conditions of the devices, the protective domes used in them are made of sapphire.

Materials:

sapphire Al2O3
germanium Ge
silicon Si
quartz KU-1
quartz KV
Russian glass
Schott, Ohara glasses

Specifications

Diameter: 5-250mm

Parameters	Achievable values *
Surface finish	Class II
Surface irregularity N / ∆N, rings	3/0.5
Thickness irregularity, mm	0.02
Diameter tolerance, mm	0.05
Thickness tolerance, mm	0.05

* Determined by material and set of parameters.

The domes can be made with optical coatings.

Materials:

Specifications

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