Abstract
We have developed a new facility for high resolution spectral calibration of detector responsivity. The system is composed of a Fourier Transform Infrared (FT-IR) spectrometer, a calibrated pyroelectric reference detector, and optics for directing the beam to the reference detector or detector under test. At this time, the system can perform calibrations from 1.6 micrometers with a spectral resolution of 0.13 nanometers to 25 micrometers with a spectral resolution of 31 nanometers (6250 cm-1 to 400 cm-1 with 0.5 cm-1 resolution). Acquisition software and motorized stages enable calibration automation over hours of data collection time, reducing noise through co-adding many scans and reducing drift through regular switching between detectors. Using a focused beam, spatial uniformity of detector responsivity can also be determined. Calibration results for cryogenic infrared detectors measured using this detector comparator system will be presented.
A New NIST FT-IR Spectral Detector Comparator
We have developed a new facility for high resolution spectral calibration of detector responsivity. The system is composed of a Fourier Transform Infrared (FT-IR) spectrometer, a calibrated pyroelectric reference detector, and optics for directing the beam to the reference detector or detector under test. At this time, the system can perform calibrations from 1.6 micrometers with a spectral resolution of 0.13 nanometers to 25 micrometers with a spectral resolution of 31 nanometers (6250 cm-1 to 400 cm-1 with 0.5 cm-1 resolution). Acquisition software and motorized stages enable calibration automation over hours of data collection time, reducing noise through co-adding many scans and reducing drift through regular switching between detectors. Using a focused beam, spatial uniformity of detector responsivity can also be determined. Calibration results for cryogenic infrared detectors measured using this detector comparator system will be presented.