Patent ID: 8981301
Filing Date: 2015-03-17
Classification: G01J,G01N

Abstract:
1. A method of measuring a time-domain waveform of a terahertz wave based on time-domain spectroscopy by using an optical delay unit to adjust an optical path length along which excitation light propagates thereby adjusting a difference between a time at which the excitation light arrives at a generating unit configured to generate the terahertz wave and a time at which the excitation light arrives at a detection unit configured to detect the terahertz wave, the method comprising: driving the optical delay unit according to a first speed pattern to acquire a first time-domain waveform; driving the optical delay unit according to a second speed pattern different from the first speed pattern to acquire a second time-domain waveform; and averaging the first time-domain waveform and the second time-domain waveform.