Patent ID: 7852466

Claim:
An apparatus for obtaining information related to terahertz waves transmitted through or reflected by a sample, the apparatus comprising: a generation unit arranged to generate terahertz waves; a detection unit arranged to detect terahertz waves which are generated by the generation unit and transmitted through or reflected by a sample; a delay unit arranged to change a timing for the detection unit to detect the terahertz waves; a storage unit arranged to pre-store information related to internal information of the sample as a standard information; a waveform obtaining unit arranged to obtain a temporal waveform of the transmitted or reflected terahertz waves which are obtained by the delay unit; and a delay time adjustment unit arranged to control the delay unit on the basis of the standard information pre-stored in the storage unit, wherein the terahertz waves from the sample include a first pulse and a second pulse, wherein the delay time adjustment unit adjusts the delay unit in a discontinuous manner on the basis of a position on a time axis for the first pulse and the second pulse, and wherein the waveform obtaining unit reconstructs the temporal waveforms by providing a time interval between the first pulse and the second pulse.