Argus Calibration

The Argus 1000 infrared spectrometer is calibrated in a three-step process. First, a wavelength calibration is conducted using infrared lasers at 1064nm and 1532nm. 

Argus calibration (left to right: data display, ground-system electronics, spectrometer on mount, collimator, infrared laser), .

An infrared laser source is passed through a collimator optics that fills the instrument field of view. This simulates radiation emitted by a ground tile and received by the spectrometer. The spectrometer is mounted on an adjustable vernier kinematic mount with five degrees of freedom.

Shown below are the spectral response of the device under illumination by a collimated monochromatic laser source at 1064nm and the sensitivity of this peak response as a function of angle. After the wavelength response has been determined, the device is calibrated for absolute radiometric accuracy using a calibrated standard illumination source mounted 50 cm from the instrument aperture.