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METHOD OF RECONSTRUCTION
COLOR CODING TECHNIQUES AND RESULTS
2 other sections not shown
21 kHz acoustic A. F. METHERELL NOVEMBER acoustic frequency components aperture hi-fi tweeter argon-ion and helium-neon blue components blue correspond COLOR ACOUSTICAL HOLOGRAPHY color coding Color-coded reconstruction colored filters complete scan process composite optical reconstruction correspond to 15 cut film cutout demagnified diffusely reflecting letters Diffusely reflecting object E. J. PISA Ektacolor L cut Figure 3 red filters and multiple-exposure geophysical applications helium-neon lasers HOLOGRAM SCAN PLANE holograms shown kHz acoustic frequency Layout of sound limb width METHERELL NOVEMBER 1969 microphone with associated multicolor composite optical multiple-exposure photography object fields object letters ARL Phase-only acoustical holograms photographs reconstructed images reconstruction of diffusely reconstruction using argon-ion reconstruction wavelength ratio recorded at 15 reflecting letters ARL reflecting object letters respectively scanning microphone scanning rig Schematic showing three-color showing three-color reconstruction shown in Figure signal silhouette object letter sound source spatially filtered letter SPINAK A. F. METHERELL summing amplifier tweeter image yellow