Spatial Input Response Of Active Cavity Radiometers Are Shown To Obey Cosine Law Over Input Angles Extending Beyond The Earth Limb

R. J. Hesser; S. L. Carman; R. I. Gilje

doi:10.1117/12.935937

22 September 1983 Spatial Input Response Of Active Cavity Radiometers Are Shown To Obey Cosine Law Over Input Angles Extending Beyond The Earth Limb

R. J. Hesser, S. L. Carman, R. I. Gilje

Author Affiliations +

Proceedings Volume 0416, Applications of Optical Metrology: Techniques and Measurements II; (1983) https://doi.org/10.1117/12.935937
Event: 1983 Technical Symposium East, 1983, Arlington, United States

Abstract

The requirement to verify that the Earth Radiation Budget Experiment (ERBE) radiation measurement instruments respond accurately to input radiation over large input angles is discussed in this paper. The use of active cavity radiometers (ACRs) in the reference and the ERBE flight instruments, with fields of view ranging between 50 and 145 deg conical angle, required considerable development and analysis to ensure that the radiometers were designed properly. Ray trace analyses, laser experiments in both visible and infrared regimes, test data of the instrument when subjected to distributed irradiance calibration sources and, finally, a cosine response test on the overall instrument, are also discussed. Cosine response is demonstrated within the included field of view with these large acceptance angles, while zero input response is verified for sources emanating outside the nominal cut-off angles for each sensor. The use of reflecting field-of-view limiters reduces the sensitivity of thermal input from the instrument front end, but enhances the stray radiation. These instruments are shown to be insensitive to stray radiation caused by the radiometric design. This paper describes the angular response analyses, tests, and associated hardware that enables the prospective users of the ERBE instruments to con-fidently measure earth radiation for input acceptance angles extending beyond the earth limb, without having to be concerned with solar or lunar stray radiation effects outside the acceptance angles.

Citation Download Citation

R. J. Hesser, S. L. Carman, and R. I. Gilje "Spatial Input Response Of Active Cavity Radiometers Are Shown To Obey Cosine Law Over Input Angles Extending Beyond The Earth Limb", Proc. SPIE 0416, Applications of Optical Metrology: Techniques and Measurements II, (22 September 1983); https://doi.org/10.1117/12.935937

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Sensors

Radiometry

Calibration

Sun

Electro optical modeling

Aerospace engineering

Krypton ion lasers

Show All Keywords

Keywords/Phrases

Search In:

Publication Years