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

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 A in hollow glass shells having a mean wall thickness of 1 microm. An improved technique for detecting and quantifying local wall-thickness variations is described. These results are compared with previous sensitivities.