[14a-D63-1~10] 1.3 Novel technologies and interdisciplinary engineering

[14a-D63-6] Time Division Lock-in Detection (TDLD) for Observation of Response Waveform in Time domain

〇Keisuke Seto¹, Toshitaka Niwase², Eiji Tokunaga¹ (1.Tokyo Univ. of Sci., 2.Kyushu Univ.)

Keywords:lock-in detection, time domain, relaxation

The lock-in detection enables measurement of a signal on high background with high signal to noise ratio (SNR) relying on a bandwidth limiting at the lock-in frequency. It also enables evaluation of response lag according to the phase retardation. However, the obtained value is a data at merely the lock-in frequency. We developed a time division lock-in detection method to observe response waveform in the time domain. The signal is divided in the period of a perturbation on the sample, and each divided signal is lock-in detected. This method enables direct observation of the waveform of response lad in the time domain as well as the enhancement of SNR with the bandwidth limiting.