Van der Lugt optical correlation for use in the improvement of hermetically sealed microstimulator technology

Colleen Mary Fitzpatrick; Edward P. Mueller

doi:10.1117/12.60212

1 August 1992 Van der Lugt optical correlation for use in the improvement of hermetically sealed microstimulator technology

Colleen Mary Fitzpatrick, Edward P. Mueller

Author Affiliations +

Proceedings Volume 1647, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine II; (1992) https://doi.org/10.1117/12.60212
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

As neuroprostheses become smaller, the need for superior quality control becomes vital. For such devices, Van der Lugt optical correlation (VLOC) techniques, involving Fourier transform holography, offer the potential of superseding conventional leak testing methodologies -- in that working with light is cleaner, faster, more sensitive, and eliminates the disadvantages of tracer gas introduced through backfilling or `bombing.' Current leak testing methods often prove inadequate for very small and delicate devices, as they sometimes involve inordinate stress on the package, or introduce undesirable results due to chemical considerations. In the case of very small packages, gross leaks are often missed by conventional means, since minute quantities of tracer gas introduced into the package may have disappeared by the time the test is run. VLOC techniques have been shown to overcome many of these limitations. The preliminary studies reported here indicate that VLOC techniques are capable of detecting leaks in the range of 10^-6 and above in large aluminum-enclosed electronic packages. Furthermore, the method has been proven capable of automation through the use of a thermoplastic recording camera.

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Colleen Mary Fitzpatrick and Edward P. Mueller "Van der Lugt optical correlation for use in the improvement of hermetically sealed microstimulator technology", Proc. SPIE 1647, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine II, (1 August 1992); https://doi.org/10.1117/12.60212

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KEYWORDS

Helium

Fourier transforms

Holograms

Calibration

Holography

Testing and analysis

Cameras

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