Effect of change in a normative approach on the evaluation of surface scratches on high-precision optical surfaces

Michal Špína; František Procháska

doi:10.1364/AO.445214

Applied Optics
Vol. 61,
Issue 7,
pp. 1593-1599
(2022)
•https://doi.org/10.1364/AO.445214

Effect of change in a normative approach on the evaluation of surface scratches on high-precision optical surfaces

Michal Špína and František Procháska

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Michal Špína and František Procháska, "Effect of change in a normative approach on the evaluation of surface scratches on high-precision optical surfaces," Appl. Opt. 61, 1593-1599 (2022)

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Abstract

The evaluation of optical surface defects is an integral part of the realization of precise optical elements. In addition to the traditionally used visual inspection procedures based on MIL-O-13830A, procedures based on ISO standards, which underwent some changes in 2017, are coming to the forefront. One of these changes was the omission of equivalent radiometric sizes and their replacement by geometric dimensions. This paper focuses just on the analysis of the impact of this change on the values of specifications defining the requirements on the scratch and dig quality of optical elements. Among other things, this presents a possible way to correct specification classes based on the statistical processing of a set of parameters of imperfections detected on optical element surfaces, which have been realized in the TOPTEC Centre.

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Scratch	A	B
Project	PROBA 3	FLEX
Geometric Width	12,69 µm	11,01 µm
LEW	1,09 µm	1,74 µm
Maximum Weber Contrast	0,12	0,23

Number	LEW [µm]	W [µm]	A(LEW) [mm]	A(W) [mm]	Contrast	LEW/W	log (W/LEW)	$Δ k$
1	2,88	19,83	0,004	0,025	0,34	0,15	0,84	4,19
2	2,86	16,16	0,004	0,025	0,37	0,18	0,75	3,76
3	1,80	18,83	0,0025	0,025	0,17	0,10	1,02	5,10
4	2,57	12,91	0,004	0,016	0,35	0,20	0,70	3,50
5	1,41	15,04	0,0016	0,016	0,17	0,09	1,03	5,14
6	2,73	18,12	0,004	0,025	0,30	0,15	0,82	4,11
7	1,86	10,33	0,0025	0,016	0,30	0,18	0,74	3,72
8	2,19	11,28	0,0025	0,016	0,26	0,19	0,71	3,56
9	2,39	13,80	0,0025	0,016	0,27	0,17	0,76	3,81
10	2,81	15,02	0,004	0,016	0,35	0,19	0,73	3,64
11	1,96	10,14	0,0025	0,016	0,32	0,19	0,71	3,57
12	0,94	10,41	0,001	0,016	0,16	0,09	1,04	5,22
13	1,61	10,39	0,0025	0,016	0,23	0,15	0,81	4,05
14	3,60	18,07	0,004	0,025	0,34	0,20	0,70	3,50
15	1,41	9,23	0,0016	0,01	0,29	0,15	0,82	4,08
16	0,60	9,40	0,00063	0,01	0,10	0,06	1,20	5,99
17	0,28	5,19	0,0004	0,0063	0,07	0,05	1,27	6,33
18	0,65	6,66	0,001	0,01	0,15	0,10	1,01	5,04
19	0,60	7,78	0,00063	0,01	0,10	0,08	1,11	5,56
20	0,72	6,70	0,001	0,01	0,16	0,11	0,97	4,85

Scratch	A	B
Project	PROBA 3	FLEX
Geometric Width	12,69 µm	11,01 µm
LEW	1,09 µm	1,74 µm
Maximum Weber Contrast	0,12	0,23

Number	LEW [µm]	W [µm]	A(LEW) [mm]	A(W) [mm]	Contrast	LEW/W	log (W/LEW)	$Δ k$
1	2,88	19,83	0,004	0,025	0,34	0,15	0,84	4,19
2	2,86	16,16	0,004	0,025	0,37	0,18	0,75	3,76
3	1,80	18,83	0,0025	0,025	0,17	0,10	1,02	5,10
4	2,57	12,91	0,004	0,016	0,35	0,20	0,70	3,50
5	1,41	15,04	0,0016	0,016	0,17	0,09	1,03	5,14
6	2,73	18,12	0,004	0,025	0,30	0,15	0,82	4,11
7	1,86	10,33	0,0025	0,016	0,30	0,18	0,74	3,72
8	2,19	11,28	0,0025	0,016	0,26	0,19	0,71	3,56
9	2,39	13,80	0,0025	0,016	0,27	0,17	0,76	3,81
10	2,81	15,02	0,004	0,016	0,35	0,19	0,73	3,64
11	1,96	10,14	0,0025	0,016	0,32	0,19	0,71	3,57
12	0,94	10,41	0,001	0,016	0,16	0,09	1,04	5,22
13	1,61	10,39	0,0025	0,016	0,23	0,15	0,81	4,05
14	3,60	18,07	0,004	0,025	0,34	0,20	0,70	3,50
15	1,41	9,23	0,0016	0,01	0,29	0,15	0,82	4,08
16	0,60	9,40	0,00063	0,01	0,10	0,06	1,20	5,99
17	0,28	5,19	0,0004	0,0063	0,07	0,05	1,27	6,33
18	0,65	6,66	0,001	0,01	0,15	0,10	1,01	5,04
19	0,60	7,78	0,00063	0,01	0,10	0,08	1,11	5,56
20	0,72	6,70	0,001	0,01	0,16	0,11	0,97	4,85

Abstract

Data Availability

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Tables (2)

Equations (15)

Applied Optics