MIL1797

Optical instrument window

MIL1797 Description

46.6 millimeters diameter, 7.6 millimeters thickness, polished surface finish, glass, optical, jan-g-174, grade b material, glass, optical, jan-g-174, grade b iii material.

Properties of MIL1797

Diameter:
Between 46.6 millimeters and 47.0 millimeters
Thickness:
Between 7.6 millimeters and 8.0 millimeters
Surface Finish:
Polished
Refraction Index:
1.5170
Polished Surface:
Both
Dispersion:
64.5 angstroms
Reflection Reducing Surface:
Both
Polished Periphery:
Not provided
Material:
Glass, optical, jan-g-174, grade b
Material:
Glass, optical, jan-g-174, grade b
Fsc Application Data:
Optical sighting and ranging equipment
NSN:
1240-00-210-4384
Description:
Window,optical Instrument
Cage Code:
06175

Definition Optical Instrument Window

A color free item of transparent or translucent material, usually optical glass, having specific light dispersive and refractive properties. This item must have two plane-parallel surfaces and is designed for use in an optical instrument to provide a barrier to foreign matter and/or permit light transmission in or to the optical system.

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Last modified 11/14/2024