Patent ID: 6747736
Filing Date: 2004-06-08
Classification: G01N

Abstract:
A terahertz wave spectrometer for performing spectroscopic measurement by using terahertz wave, comprising:a predetermined excitation light optical system guiding an excitation light; a terahertz wave generator generating terahertz wave by using the excitation light guided by the predetermined excitation light optical system; a terahertz wave optical system guiding the terahertz wave generated by the terahertz wave generator to a sample for spectroscopic measurement, and further guiding the terahertz wave which has been affected by the sample; a predetermined probe light optical system guiding a probe light that is in synchronization with the excitation light; a terahertz wave detector detecting, using the probe light guided by the predetermined probe light optical system, the terahertz wave that is affected by the sample and that is guided by the terahertz wave optical system, and outputting a detection signal; optical delay vibrating means provided in either one of the excitation light optical system and the probe light optical system, the optical delay vibrating means vibrating, at a predetermined vibration frequency, the length of the optical path of the corresponding one of the excitation light and the probe light, thereby periodically vibrating the irradiation timing of the corresponding one of the excitation light and the probe light onto a corresponding one of the terahertz wave generator and the terahertz wave detector; and spectroscopic processing means performing spectroscopic measurement on the sample based on the detection signal obtained by the terahertz wave detector, the spectroscopic processing means including frequency analyzing means performing frequency analysis on the detection signal that periodically changes in accordance with the vibration frequency, the frequency analyzing means performing the frequency analysis of the detection signal by performing a frequency domain measurement, the frequency-analysis result obtained by the frequency analyzing means indicating frequency-analysis information on the terahertz wave that has been affected by the sample, thereby indicating the spectroscopic information of the sample.