05997985 is referenced by 42 patents and cites 26 patents.

In accordance with the present invention, there is provided a method of forming an acoustic attenuation chambers within a honeycomb core. The honeycomb core have a plurality of honeycomb cells having interconnected side walls. A plurality of septum layers are spaced from one another within the honeycomb cells to define acoustic attenuation chambers between the septum layers and the side walls of the honeycomb cells. Each of the septum layers have an associated ablating wavelength and is transparent to the ablating wavelengths of the other septum layers. A laser beam having a laser wavelength is directed towards the septum layers. The laser beam is selectively absorbed by a septum layer which has an associated ablating wavelength equal to the laser wavelength to ablate apertures therethrough without ablating other septum layers.

Title
Method of forming acoustic attenuation chambers using laser processing of multi-layered polymer films
Application Number
9/150579
Publication Number
5997985
Application Date
September 10, 1998
Publication Date
December 7, 1999
Inventor
Robert K Kunze Jr
Derby
KS, US
James A Clarke
Greenlawn
NY, US
Agent
Karl J Hoch Jr
Terry J Anderson
Assignee
Northrop Grumman Corporation
CA, US
IPC
B32B 3/12
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