Application of VanderLugt optical correlation techniques to the holographic examination of hermetically sealed neuroprostheses

Colleen Mary Fitzpatrick

doi:10.1117/12.144167

11 May 1993 Application of VanderLugt optical correlation techniques to the holographic examination of hermetically sealed neuroprostheses

Colleen Mary Fitzpatrick

Author Affiliations +

Proceedings Volume 1979, 1992 International Conference on Lasers and Optoelectronics; (1993) https://doi.org/10.1117/12.144167
Event: 1992 International Conference on Lasers and Optoelectronics, 1992, Bejing, China

Abstract

As neuroprostheses are reduced in size, and as they are implanted in younger individuals with increasing life expectancies, the demands on the biomaterials used to protect them from the hostile extracellular environment are increased. Thus, implantable electronic packages must meet stringent quality assurance specifications, which dictate that both gross (approximately 10^-4 atm cc/sec) and fine (approximately 10^-8 atm cc/sec) leak testing must be performed on even very delicate packages. For such devices, Van der Lugt Optical Correlation (VLOC) Techniques 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.' This paper briefly presents VLOC techniques, coupled with a discussion of basic leak theory. The ability of the method to detect and to estimate the size of leaks down to 10^-6 atm cc/sec is demonstrated, and a comparison is made between VLOC techniques and conventional helium leak testing methodology in terms of accuracy, speed, efficiency, and total cost.

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Colleen Mary Fitzpatrick "Application of VanderLugt optical correlation techniques to the holographic examination of hermetically sealed neuroprostheses", Proc. SPIE 1979, 1992 International Conference on Lasers and Optoelectronics, (11 May 1993); https://doi.org/10.1117/12.144167

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