Relative Spectral Response And Low Background Radiometric Detector Measurements

John P. Sheppard; Grant C. Albright; Mark E. Borstelmann

doi:10.1117/12.960680

25 September 1989 Relative Spectral Response And Low Background Radiometric Detector Measurements

John P. Sheppard, Grant C. Albright, Mark E. Borstelmann

Proceedings Volume 1108, Test and Evaluation of Infrared Detectors and Arrays; (1989) https://doi.org/10.1117/12.960680
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

A long wavelength infrared relative spectral response measurement system has been developed. Measurements from this system are combined with low background blackbody-based broadband measurements to produce accurate absolute spectral response measurements. The requirement for this capability was driven by the development of LWIR detectors intended for operation at backgrounds of 109 to 1014 photons/cm2 sec and the subsequent need for accurate determination of the figures of merit of the detectors at these backgrounds. The heart of the spectral response system is an Optronics Laboratories model 735D triple grating, subtractive mode, double monochromator with a spectral range of 2 to 30 microns. Details of the monochromator design are presented and the complete spectral response system is described. Sample data from the relative spectral response test is shown and the repeatability of these tests is demonstrated. The monochromator uses pyroelectric reference detectors to measure the relative spectral irradiance on the detector under test. The relative response curves of the pyroelectric reference detectors have been measured by comparison to a blackened thermocouple detector. Samples of these measurements are presented. Test instrumentation, test dewar optical components and test methods for the broadband radiometric measurements are also discussed. Sample data from several broadband tests is shown and the accuracy of these measurements and potential sources of error are analyzed. Absolute detector response is obtained from the relative response and broadband measurements by using the relative response curve to convert the total broadband photon flux to equivalent photon flux at the peak photon response wavelength. This procedure and the required numerical integration software are also discussed. Comparative radiometric measurements of front illuminated Si:As IBC detectors are discussed.

Citation Download Citation

John P. Sheppard, Grant C. Albright, and Mark E. Borstelmann "Relative Spectral Response And Low Background Radiometric Detector Measurements", Proc. SPIE 1108, Test and Evaluation of Infrared Detectors and Arrays, (25 September 1989); https://doi.org/10.1117/12.960680

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