研究目的
Investigating the therapeutic effects of a specific herbal medicine on a particular disease.
研究成果
The study demonstrated parts-per-trillion sensitivity for trace-moisture detection using wavelength-meter-controlled cavity ring-down spectroscopy with the developed frequency-control and temperature-control systems. The standard deviation of residuals from the fitting of the averaged spectrum was 6.6 × 10?12 cm?1, corresponding to a mole fraction of water of 6.3 ppt.
研究不足
The study acknowledges the challenge of correcting errors in the laser frequency measured using a wavelength meter and fluctuations in the ring-down time due to temperature fluctuations of the cavity. The potential for improvement in the repetition rate of ring-down time measurements is also noted.
1：Experimental Design and Method Selection:
The study introduced frequency-control and temperature-control systems in wavelength-meter-controlled cavity ring-down spectroscopy to address measurement errors and fluctuations in the ring-down time.
2：Sample Selection and Data Sources:
Near-infrared spectra of residual moisture in dry nitrogen at an approximately 1 ppb level were measured.
3：List of Experimental Equipment and Materials:
A distributed feedback (DFB) laser at 1393 nm, a periodically poled lithium niobate (PPLN) waveguide module, a wavelength meter, and a temperature-control system were used.
4：Experimental Procedures and Operational Workflow:
The frequency of the probe laser was controlled to match a resonant frequency using a wavelength meter, and the temperature of the cavity was kept constant to suppress fluctuations in the ring-down time.
5：Data Analysis Methods:
The averaged spectrum was analyzed using least-squares fitting with Lorentzian functions and a linear baseline.
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