研究目的
The development, calibration, and operation of a diode laser spectrometer for high-precision measurements, focusing on the analysis of an isolated P20 line of the 12C16O2 molecule.
研究成果
A diode laser spectrometer for high-precision measurements has been developed, calibrated, and put into operation. The integral intensity of the analytical line was measured with high accuracy, and the spectrometer's error budget was analyzed. The study revealed subtle effects related to gas deviation from ideality and the correlation of phase changes in molecular oscillation and molecule velocity at collisions.
研究不足
The accuracy of measurements is limited by the uncertainty of the sample's isotopic composition and the lasing spectrum width of the diode laser. The baseline drift and flicker noise also limit the sensitivity.
1：Experimental Design and Method Selection:
The spectrometer uses a diode laser with a fibre pigtail and an optical scheme with five channels recorded by five photodiodes. The spectrometer's operation regimes allow signals from any three photodiodes to be recorded without changes in the optical system.
2：Sample Selection and Data Sources:
The tests rely on the use of an isolated P20 line of the 00031 – 00001 band of the 12C16O2 molecule.
3：List of Experimental Equipment and Materials:
The spectrometer includes several tens of diode lasers from different manufacturers, cells made of stainless steel, a Fabry–Perot etalon, and a ring fibre interferometer.
4：Experimental Procedures and Operational Workflow:
The spectrometer operation involves recording signals from photodiodes, measuring cell lengths, and calibrating the frequency scale using a Fabry–Perot etalon and a ring fibre interferometer.
5：Data Analysis Methods:
A software programme for the approximation of a spectral line contour is designed, and the procedure is analysed to determine the optimal number of fitting parameters.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
Diode Laser
NEL SN922076
NEL
Used as the radiation source in the spectrometer.
-
Photodiode
Used to record signals from the spectrometer's channels.
-
Fabry–Perot etalon
Used for frequency scale calibration.
-
Ring Fibre Interferometer
Used for frequency calibration and studying the DL lasing spectrum.
-
Turbomolecular Pump
HiCube80 Eco
PFEIFFER
Used to obtain high vacuum up to 10–7 mbar.
-
Vacuum Gauge
EDWARDS WRG
EDWARDS
Used as a system's vacuum indicator.
-
Capacitive Vacuum Gauge
Setra model 764
Setra
Used for pressure measurement.
-
Strain Gauge
EDWARDS ASG D357-26-000
EDWARDS
Used as a sensor in a vacuum gauge.
-
Thermistor
Used for temperature measurement.
-
Mercury-Glass Laboratory Thermometer
TL-4 No. 879
Used for thermistor calibration.
-
登录查看剩余8件设备及参数对照表
查看全部
