UH-1
UH-1 Huey

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The Spectron Engineering SE-590 is a portable battery or A/C operated spectroradiometer consisting of a CE500 data analyzer/logger controller, CE390 spectral detector head and an external battery charger/power supply. The CE500 is a self contained microprocessor based controller which processes the signal from the detector head, amplifying and digitizing it with 12 bit resolution. For each spectral scan, the controller actuates the CE390 shutter, measures and stores the dark current, calculates optimum integration time, acquires the spectrum and automatically subtracts the noise for all 256 spectral elements. A series of scans can be taken and automatically averaged. The spectrum is stored in a double precision register which saves the entire 12-bit binary spectra until it is transmitted through the RS-232C port. The spectral detector head uses a diffraction grating as the dispersing element; the spectrum is imaged onto a 256 element photodiode array. Each element integrates simultaneously acquiring the spectrum in a fraction of a second. The interconnect cable from the spectral head to the controller couples the spectral signals to the controller, and the timing and control signals to the detector head. A shutter in the detector head, operated by the controller, closes the light path for dark current measurements.

The Modular Multiband Radiometer (MMR) is an airborne multispectral radiometer manufactured by Barnes Engineering Company. MMR measures radiance across 8 spectral bands in the infrared and visible wavelengths (0.4-12.5 μm) to provide imagery of vegetation and other surface features. At an altitude of 300 m, the MMR has an instantaneous field of view (IFOV) of approximately 79 m and a 15-degree field of view (FOV). It is typically deployed on small aircraft such as helicopters but can be deployed on ground-based platforms as well.

The POLarization and Directionality of the Earth’s Reflectances (POLDER) is a spaceborne passive radiometer that was onboard the Japan Aerospace Exploration Agency’s Advanced Earth Observing Satellite. POLDER has also been utilized in several airborne investigations to perform instrument calibration and to provide measurements of surface reflectance and solar radiation. POLDER has a ground spatial resolution of 7 km x 6 km at nadir and operates across eight discrete spectral bands (443 nm - 910 nm).

The Airborne Tracking Sun Photometer (ATSP) is an airborne instrument that measures direct solar beam transmission. The ATSP measures solar beam transmission through multiple channels with wavelengths ranging between 354 and 2139 nm. These measurements can be used to derive aerosol optical depth and other aerosol properties. There are multiple versions of this instrument, including one developed by the NASA Ames Research Center.

The C-band scatterometer is a FM-CW scatterometer that operates at 5.3 GHz. The C-band scatterometer is typically used in land, sea, and ice studies. For land applications, it is used to measure surface moisture content.