Patent ID: 8513940
Filing Date: 2013-08-20
Classification: G01R

Abstract:
1. A method of measuring a time-domain waveform of a terahertz wave based on time-domain spectroscopy, the method comprising: detecting, by a photoconductive device, a current signal including a current signal component originating from the terahertz wave; detecting a voltage signal corresponding to the detected current signal; at a pre-processing stage before the voltage signal detection, drawing an offset current that is included in the detected current signal and that has no relation to a change in electric field of the terahertz wave; monitoring the offset current based on the detected voltage signal and adjusting the magnitude of the drawn offset current according to a result of the monitoring; and acquiring a time-domain waveform of the terahertz wave based on the voltage signal detected while drawing the offset current, wherein the monitoring of the offset current and the adjusting of the offset current are performed in a waiting state in which measurement of the time-domain waveform of the terahertz wave is not performed.