MIL-PRF-38169A
TABLE I. Example for calculation of spectral transmittance deviations.
Wave
Wave
Average
Percent
length
Band
length
transmittance
Deviation
(nm)
T
n
range
Tn
100(1-Tn/Tc)
Weight
Product
430
0.114
440
0.118
450
0.127
460
0.137
1
430-490
0.133
14
5
70
470
0.142
480
0.144
490
0.145
2
460-520
0.145
7
10
70
500
0.147
510
0.149
520
0.151
3
490-550
0.151
3
10
30
530
0.153
540
0.154
550
0.155
4
520-580
0.155
0
10
0
560
0.157
570
0.158
580
0.159
5
550-610
0.159
2
10
20
590
0.160
600
0.160
610
0.160
6
580-640
0.160
2
10
30
620
0.161
630
0.161
640
0.160
7
610-670
0.160
3
10
30
650
0.159
660
0.159
670
0.158
8
640-700
0.158
2
5
10
680
0.157
690
0.156
700
0.153
9
670-730
0.153
1
1
1
710
0.151
___
___
720
0.149
Totals
71
261
730
0.148
LEGEND:
Tc = Spectral transmittance (Use 0.155).
T = Transmittance at 10 nm intervals.
Tn = Average transmittance of 60 nm band.
NOTES:
1. This table is based on CIE illuminant D65(see 6.3.3)
2. Tn for a given band is the average of the seven tabulated values within that band, except that
the first and last values are divided by 2, and the average computed by dividing the sum of the
values by 6.
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