Patent ID: 7074287

Claim:
A method of assembling and monitoring an acoustic honeycomb panel comprising a double resonator, the panel consisting of a plurality of layers to be assembled in the direction of the thickness of the panel namely: an acoustic skins, a primary honeycombs, a septum pierced with a plurality of holes, a secondary honeycomb and a solid skin, the method including preliminary operations of gluing the various layers to be assembled, characterized in that: in a first step, the two honeycombs are assembled with the septum by gluing, the subassembly thus obtained being referenced, the holes in the septum which are still free being referenced; subsequent to the assembly of the two honeycombs with the septum and prior to the assembly of at least one of the two skins, at least one of the honeycombs thus being uncovered, the degree of perforation of the septum is monitored by scanning the subassembly with a digital camera including an associated illumination system, the camera being arranged on the same side as an uncovered honeycomb, the cameras thus taking shots of the septum at the bottom of the cells of the uncovered honeycomb, this illumination system illuminating the region of the septum observed by the camera, the successive images thus obtained being transmitted to a computer, the computer analyzing the images and establishing the degree of perforation T of the septum by applying the formula T=N1/N, in which N1 is the number of pixels corresponding to the free holes and N is the number of pixels of the image.