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An optical Fourier transform technique (OFT) is described whereby the density of ion tracks in cellulose nitrate (CN) film produced by fast ions from a laser‐produced plasma may be quantitatively assessed. Such ions are analyzed by means of a Thomson parabola‐type mass spectrometer employing CN film as a detector. The task of counting the 106–107 ion tracks in the CN film is onerous. If an electroetched mesh is placed over the film during exposure, the ion tracks representing the signal are confined to a rectangular two‐dimensional array. This imposed periodicity provides a simple means to separate the signal from the inevitable etching noise present on the film by suitably masking the Fourier transform of the film. The subsequent enhanced image of the film has a markedly increased signal/noise ratio and may be processed for track density information by means of a scanning vidicon.