Performance of a Spectrometer for Measuring the Earth's Radiance near 4.3 micro

Area of Science:

• Atmospheric Science
• Spectroscopy
• Earth Observation

Background:

• Understanding Earth's atmospheric composition and radiative properties is crucial for climate modeling.
• Remote sensing of atmospheric radiance provides key data for these studies.

Purpose of the Study:

• To construct and calibrate a grating spectrometer for measuring Earth's radiance.
• To assess the instrument's performance in the 4.3 micrometer spectral region.

Main Methods:

• Development of a grating spectrometer for simultaneous measurement of Earth's radiance.
• Calibration procedures achieving 3% absolute accuracy in spectral radiance determination.
• Utilized thirty-five spectral intervals of 0.04 micrometer width at 20-second intervals.

Main Results:

• Successful construction of a grating spectrometer capable of precise radiance measurements.
• Demonstrated absolute accuracy of approximately 3% for spectral radiance.
• Instrument performance validated through balloon flight measurements in 1967 and 1968.

Conclusions:

• The developed grating spectrometer is a reliable tool for atmospheric radiance measurements.
• The instrument's accuracy supports its use in Earth science research.
• Balloon-borne measurements confirm the spectrometer's effectiveness for atmospheric studies.