Patent ID: 8619154

Claim:
A method comprising: positioning a balloon in a cavity, the balloon including a fluorescent substance that fluoresces over a range of wavelengths; inflating the balloon with a medium until a surface of the balloon conforms to a target surface within the cavity, wherein the medium absorbs a first wavelength of light within the range of wavelengths more than a second wavelength of light within the range of wavelengths; illuminating the surface of the balloon at an excitation wavelength for the fluorescent substance; measuring an intensity of the first wavelength and an intensity of the second wavelength in a direction of a location on the surface when illuminated; calculating a thickness of the medium in the direction of the location based upon a ratio of the intensity of the first wavelength and the intensity of the second wavelength; and combining a plurality of similarly calculated thickness measurements of the medium in a plurality of directions toward the surface of the balloon to obtain a three-dimensional image of the balloon.