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We report the first outdoor measurements for continuous in vivo leaf-water monitoring using THz spectroscopy. For this, we have developed a compact and portable THz quasi time-domain spectrometer which can be powered by a battery. We monitor the water status of a corn plant (Zea mays) and discuss the influence of the day-night variations of the outdoor temperature.
We investigate the impact of periodic sampling time errors of terahertz time-domain waveforms and analytically calculate the influence on the spectrum of the measurement. We assess the effects on optical parameter extraction.
We present a THz quasi time-domain spectroscopy (QTDS) system based on fiber coupled antennas operating at 1550 nm excitation wavelength. Frequency components up to 950 GHz can be generated with this setup. The signal to noise ratio of a single shot measurement is around 60 dB between 40 GHz and 240 GHz.
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