Patent ID: 8405406

Claim:
A detection apparatus comprising: a generating section for generating an incoherent electromagnetic wave, wherein the incoherent electromagnetic wave is a compression wave; a first coupler section for splitting the incoherent electromagnetic wave into a first wave and a second wave; a delaying section for delaying a propagation time of the second wave by changing a propagation state thereof; a second coupler section for coupling the first wave, whose propagation state has been changed by a target of observation, and the second wave, whose propagation state has been changed by said delaying section, to produce a coupled wave having a correlation signal between the first and the second waves; a detecting section for detecting the correlation signal of the coupled wave; a signal processing section for acquiring information on the target of observation based on a delay extent of the propagation time given by said delaying section and an intensity of the correlation signal detected by said detecting section; and a restoring section for dissolving coarse and dense states of the compression wave on a propagation route of electromagnetic wave arranged between said second coupler section and said detecting section, wherein said generating section includes an electromagnetic wave source for generating a coherent electromagnetic wave and a diffusing section for generating the pseudo-incoherent electromagnetic wave by changing a propagation state of the coherent electromagnetic wave generated by said electromagnetic wave source in accordance with a code pattern that changes in time series.