NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
An automated optical wedge calibrator for Dobson ozone spectrophotometersThe Dobson ozone spectrophotometer measures the difference of intensity between selected wavelengths in the ultraviolet. The method uses an optical attenuator (the 'Wedge') in this measurement. The knowledge of the relationship of the wedge position to the attenuation is critical to the correct calculation of ozone from the measurement. The procedure to determine this relationship is time-consuming, and requires a highly skilled person to perform it correctly. The relationship has been found to change with time. For reliable ozone values, the procedure should be done on a Dobson instrument at regular intervals. Due to the skill and time necessary to perform this procedure, many instruments have gone as long as 15 years between procedures. This article describes an apparatus that performs the procedure under computer control, and is adaptable to the majority of existing Dobson instruments. Part of the apparatus is usable for normal operation of the Dobson instrument, and would allow computer collection of the data and real-time ozone measurements.
Document ID
19950004669
Document Type
Conference Paper
Authors
Evans, R. D. (Colorado Univ. Boulder, CO, United States)
Komhyr, W. D. (Colorado Univ. Boulder, CO, United States)
Grass, R. D. (Colorado Univ. Boulder, CO, United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1994
Publication Information
Publication: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 2
Subject Category
INSTRUMENTATION AND PHOTOGRAPHY
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 19950004669.pdf STI

Related Records

IDRelationTitle19950004531Analytic PrimaryWorkshop on the Analysis of Interplanetary Dust Particles