研究目的
Investigating the detectable concentrations of DHO using a portable terahertz spectrometer with a multi-pass sample cell.
研究成果
The study demonstrates the ability to measure DHO concentrations of 0.1% in H2O vapor with a 3.4 meter path-length, multi-pass sample cell held at 740 Torr. Future work will focus on lower pressures and longer path-lengths.
研究不足
The study focuses on DHO concentrations in H2O vapor and does not address other molecules or conditions. The portable THz spectrometer's spectral purity, frequency accuracy, and detection sensitivity are challenges that need to be addressed for broader applications.
1：Experimental Design and Method Selection:
The study employs a frequency domain THz spectrometer with a multi-pass sample cell for increased sensitivity and a phase modulator for fringe removal.
2：Sample Selection and Data Sources:
DHO concentrations in H2O vapor were measured at various pressures.
3：List of Experimental Equipment and Materials:
A custom fabricated, light-weight multi-meter multi-pass sample cell and a modified Bakman Technologies PB7220-2000-T THz spectrometer.
4：Experimental Procedures and Operational Workflow:
A 6 kHz phase modulation was applied to the optical signal feeding the source photomixer, resulting in an equivalent phase modulation on the propagating THz radiation. The 1st and 2nd harmonics of the signal were detected.
5：Data Analysis Methods:
The study reports on progress with lower pressures and longer path-lengths.
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