An infrared heterodyne radiometer for high-resolution measurements of solar radiation and atmospheric transmission

Physics – Optics

Scientific paper

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Atmospheric Optics, Infrared Radiometers, Optical Heterodyning, Solar Radiation, Transmissivity, Atmospheric Attenuation, Cloud Cover, High Resolution, Radiation Measurement, Signal To Noise Ratios, Spectral Resolution

Scientific paper

A tunable, Dicke-switched, infrared heterodyne radiometer (IHR) has been designed, fabricated, tested, and used to observe solar radiation and determine the atmospheric transmissivity in the 9-11-micron spectral band. The IHR provides a spectral resolution of 0.0067 reciprocal cm, a minimum detectable power level of 2.9 times ten to the minus twenty-third power W/Hz, and a temperature resolution of less than 1 K for a source temperature of 1000 K, an IF predetection bandwidth of 100 MHz, and an integration time of 30 s. Detailed design equations and measured IHR performance are presented. The IHR was used to make solar and atmospheric transmission measurements, and a vertical-path atmospheric attenuation of 2.3 dB has been established under favorable weather conditions. The attenuation of solar radiation due to cloud cover and haze has also been investigated.

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