APPARATUS AND METHOD FOR MEASURING ELECTROMAGNETIC WAVE

摘要

The present invention provides an apparatus and a method for transforming a time waveform of an electromagnetic wave into a time waveform suited for signal processing and the like so as to measure the time waveform. A wavelet transform is performed on a first time waveform of an electromagnetic wave, such as a terahertz wave, measured in advance, and a second time waveform suited for signal processing and having a high correlation with a mother wavelet used in the wavelet transform is formed by controlling a wavelet expansion coefficient. In a second measurement process and onward of a target object, a transforming unit, such as a bias voltage controller, is used to transform the electromagnetic wave into a transformed time waveform so as to measure the time waveform.