Patent ID: 7551269

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 terahertz waves; a storage unit arranged to pre-store information related to the sample; and a waveform obtaining unit arranged to obtain a temporal waveform of the transmitted or reflected terahertz waves which are obtained by the delay unit, wherein the delay unit is controllable to allow the detection unit to detect the terahertz waves in an area related to the temporal waveform set on the basis of the information related to the sample pre-stored in the storage unit, and a temporal waveform of the transmitted or reflected terahertz waves in the area is obtained, and wherein a number of times the sample is measured is counted and the measured terahertz waves detected by the detection unit are accumulated to obtain an average intensity of the terahertz waves by using the accumulated value and the number of times.