National Physical Laboratory


Compact High Resolution Imaging Spectrometer

During the calibration of CHRIS (Compact High Resolution Imaging Spectrometer), built by Sira Electro-optics Ltd (now part of Surrey Satellite Technology Ltd)- currently in flight on the ESA Proba platform, several primary facilities were used.

The Ultra High Temperature Black Body (UHTBB), which is part of the Spectral Radiance and Irradiance Primary Scale (SRIPS) was used directly to provide a known radiance and also used to simulate solar irradiance for calibration of an on-board calibration monitor. In addition, out-of-field stray light was characterised using a highly collimated beam of laser radiation from the NPL NLRF. During the calibration CHRIS was maintained in a class 100 environment within an NPL laboratory.


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