Superresolution of rotating objects

Temporal modulation holographic techniques using the Doppler frequency shift associated with the rotation of objects illuminated by laser light were employed to obtain lateral resolution much greater than the classical limit for an imaging system. For a particular illumination and observation direction, the light that is scattered from each lateral point on the rotating object has a unique optical carrier frequency. The object is imaged onto a photographic plate with a telescope and holographically recorded. The reference wave for this hologram is modulated to produce the same range of Doppler frequencies as from the object. Therefore, the temporal filtering property of the hologram decodes the time channel spread function into a spatial spread function.