The design of an interference filter twin photometer suitable for the observation by rocket of the daytime magnetospheric cleft aurora at 2761 A and 5200 A is presented. The two-stage baffling system test and the absolute calibration procedure are described with some detail.
A new calibration technique is described which allows a monochromatic source and detectors to be obtained as secondary standards in the vacuum ultraviolet spectral range. The method of operation is based on the comparison, against a thermopile, between an ultraviolet flux from a monochromator and the total flux from a blackbody simulator. The over-all uncertainty does not exceed 20%.
Aperture-cavity wall radiative exchange is described for various extended blackbody simulator cavities by means of a simple proper angular parameter in terms of the angle of observation.
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