X-ray microradiographs of laser fusion targets: improved image analysis techniques

R. L. Whitman; R. H. Day

doi:10.1364/AO.19.001718

Applied Optics
Vol. 19,
Issue 10,
pp. 1718-1722
(1980)
•https://doi.org/10.1364/AO.19.001718

X-ray microradiographs of laser fusion targets: improved image analysis techniques

R. L. Whitman and R. H. Day

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R. L. Whitman and R. H. Day, "X-ray microradiographs of laser fusion targets: improved image analysis techniques," Appl. Opt. 19, 1718-1722 (1980)

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Abstract

Improved techniques for analyzing x-ray microradiographic images of laser fusion targets are described. A fast Fourier transform (FFT) technique is used to detect efficiently inner–outer wall nonconcentricities of ±95 Å in hollow glass shells having a mean wall thickness of 1 μm. An improved technique for detecting and quantifying local wall-thickness variations is described. These results are compared with previous sensitivities.

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Sample and exposure date	Percent eccentricity

	Density difference	FFT	Optical interferometry
LB1-7-15-77	4	4	3
LB2-7-15-77	5	5	8
LB3-7-15-77	15	17	11
LB4-7-15-77	12	12	10
LB5-7-15-77	5	5	3
LB6-7-15-77	6	7	9
LB7-7-15-77	N/A^a	N/A^a	4
LB8-7-15-77	$⩽ 2$	0.9	5
LB9-7-15-77	11	11	10
LB10-7-15-77	5	5	5
LB11-10-13-77	2	2	<3

Sample and exposure date	Number of defects

	Old method		New method

	$2 ⩽ SNR < 3$	$SNR ⩾ 3$	$2 ⩽ SNR < 3$	$SNR ⩾ 3$
LB1-7-15-77	6	1	8	6
LB2-7-15-77	4	0	11	2
LB3-7-15-77	0	0	0	0
LB4-7-15-77	0	0	1	0
LB5-7-15-77	4	0	8	0
LB6-7-15-77	3	1^a	9	2^a
LB7-7-15-77	N/A^b	N/A^b	N/A^b	N/A^b
LB8-7-15-77	8	1	14	10
LB9-7-15-77	1	0	2	0
LB10-7-15-77	1	0	4	0
LB11-10-13-77	23	4	38	8

Sample and exposure date	Percent eccentricity

	Density difference	FFT	Optical interferometry
LB1-7-15-77	4	4	3
LB2-7-15-77	5	5	8
LB3-7-15-77	15	17	11
LB4-7-15-77	12	12	10
LB5-7-15-77	5	5	3
LB6-7-15-77	6	7	9
LB7-7-15-77	N/A^a	N/A^a	4
LB8-7-15-77	$⩽ 2$	0.9	5
LB9-7-15-77	11	11	10
LB10-7-15-77	5	5	5
LB11-10-13-77	2	2	<3

Sample and exposure date	Number of defects

	Old method		New method

	$2 ⩽ SNR < 3$	$SNR ⩾ 3$	$2 ⩽ SNR < 3$	$SNR ⩾ 3$
LB1-7-15-77	6	1	8	6
LB2-7-15-77	4	0	11	2
LB3-7-15-77	0	0	0	0
LB4-7-15-77	0	0	1	0
LB5-7-15-77	4	0	8	0
LB6-7-15-77	3	1^a	9	2^a
LB7-7-15-77	N/A^b	N/A^b	N/A^b	N/A^b
LB8-7-15-77	8	1	14	10
LB9-7-15-77	1	0	2	0
LB10-7-15-77	1	0	4	0
LB11-10-13-77	23	4	38	8

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Applied Optics