Self-Calibrating Cavity Radiometers At The Eppley Laboratory:Capabilities And Applications

Alton R. Karoli; John R. Hickey; Roger G. Frieden

doi:10.1117/12.935917

22 September 1983 Self-Calibrating Cavity Radiometers At The Eppley Laboratory:Capabilities And Applications

Alton R. Karoli, John R. Hickey, Roger G. Frieden

Proceedings Volume 0416, Applications of Optical Metrology: Techniques and Measurements II; (1983) https://doi.org/10.1117/12.935917
Event: 1983 Technical Symposium East, 1983, Arlington, United States

Abstract

Considerable effort at The Eppley Laboratory, Inc., over the past decade has been directed toward the accurate measurement of solar irradiance and the design and development of low temperature blackbodies. Additionally, we have been involved with the design and production of thermopile-type sensors for special applications. The implications of refering all relevant measurements to a unified reference scale of radiation are always of concern. In this paper, self-calibrating radiometers with cavitated receivers which can be designed for a number of total irradiance measurement tasks will be described. Among these tasks are the measurement of solar irradiance, both direct beam and over larger fields-of-view, and the measurement of earth emitted flux (generally from satellites), for which the low temperature blackbodies act as simulators. The radiometer can also be a-dapted to a number of laboratory measurements such as the output of lamp or laser sources. The basic type of sensor employed in the Eppley radiometers is a circular, wirewound and plated thermopile, sometimes called toroidal thermopile. Self-calibration is performed using a heater on the cavity receiver which is employed in an electrical substitution mode. The difference in response produced by the heater to that produced by the radiation source is called the "nonequivalence." Determination and application of the correction factors including the components of the nonequivalence term will be discussed. Results of inter-comparisons with other self-calibrating radiometers will be presented.

Citation Download Citation

Alton R. Karoli, John R. Hickey, and Roger G. Frieden "Self-Calibrating Cavity Radiometers At The Eppley Laboratory:Capabilities And Applications", Proc. SPIE 0416, Applications of Optical Metrology: Techniques and Measurements II, (22 September 1983); https://doi.org/10.1117/12.935917

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