MIL-PRF-13830B
3.6 Cement defects. Cement bubbles, voids, undissolved particles, dry
spots, blisters, dirt (lint or dust) within the free aperture of the cemented lens
shall not exceed the limits of defects for digs and bubbles specified in 3.5.3.1
thru 3.5.4.1 inclusive.
TABLE I Surface Quality Requirements
Focal planes and near focal planes
Central zone 1/2
Outer Zone
diameter of surface
Beam diameter (mm)
Magnifying
Focal length
Scratch
Dig
Scratch
Dig
power
(mm)
Over 5.......................
.........................
....................
80
50
80
50
4-5.............................
.........................
....................
60
40
60
40
3.2-4..........................
.........................
....................
60
30
60
40
2.5-3.2
.........................
....................
40
20
60
40
2.1-2.5.......................
.........................
....................
40
15
60
30
1.6-2.1.......................
.........................
....................
30
10
40
20
1.0-1.6.......................
.........................
....................
20
5
40
15
0.6-1.0.......................
.........................
....................
15
3
30
10
0.4-0.6.......................
.........................
....................
10
2
20
5
0.2-0.4.......................
.........................
....................
10
1
15
3
0.2.............................
20-10
12.5-25
10
1
15
3
0.4............................
10-5
25-50
10
2
20
5
0. 6
5-3.3
50-75
15
3
30
10
1.0............................
3.3-2
75-125
20
5
40
15
1.6............................
2-1
125-250
30
10
40
20
3.6.1 Surface quality of cemented face. Cement defects inside the free aperture
shall be considered on the basis that the cement interface is a single surface of the
specified surface quality. When not specified, the surface quality for a cement face
shall be intermediate between that of adjacent faces.
3.6.2 Edge separations. Edge separation and edge cement defects in optical
components shall not extend beyond the edge chamfer of the cemented surface of the
lens or prism by the distance greater than 1/2 the distance between the cemented
surface chamfer of the component and the radius of the clear aperture. The
maximum dimension of any edge separation or cement defect shall not extend into the
cemented surface of the component by more than 1mm. The sum of the edge
separations or cement defects larger than 1/2mm as measured at the surface chamfer
of the lens or prism, shall not exceed 10 percent of the perimeter.
3.6.3 Bonding defects (glass to metal). Bonded optical assemblies shall have a
continuous bead of the cured adhesive along the edge of the bonded surface.
3.6.3.1 Voids and separations. Subsequent to meeting the requirements of 3.7.2
and 3.8.2.5.2, there shall be no voids or separations that exceed 10 percent of the
bonded area.
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