Dealing with the size-of-source effect in the calibration of direct-reading radiation thermometer

2013 ◽  
Author(s):  
P. Saunders
Keyword(s):  
Radiation Thermometer ◽  
Direct Reading ◽  
Source Effect

scholarly journals Influence of Size of Source Effect on Accuracy of LWIR Radiation Thermometers

2016 ◽  
Vol 23 (4) ◽  
pp. 661-667
Author(s):  
David Cywiak ◽  
Daniel Cárdenas-García ◽  
Hugo Rodriguez-Arteaga
Keyword(s):  
Radiation Thermometer ◽  
Electrical Signal ◽  
Field Of View ◽  
Measured Temperature ◽  
Temperature Deviation ◽  
Source Effect ◽  
Long Wavelength ◽  
Proposed Model ◽  
Long Wavelength Infrared ◽  
Infrared Radiation Thermometer

Abstract Determining the size of source effect of a radiation thermometer is not an easy task and manufacturers of these thermometers usually do not indicate the deviation to the measured temperature due to this effect. It is one of the main uncertainty components when measuring with a radiation thermometer and it may lead to erroneous estimation of the actual temperature of the measured target. We present an empiric model to estimate the magnitude of deviation of the measured temperature with a long-wavelength infrared radiation thermometer due to the size of source effect. The deviation is calculated as a function of the field of view of the thermometer and the diameter of the radiating source. For thermometers whose field of view size at 90% power is approximately equal to the diameter of the radiating source, it was found that this effect may lead to deviations of the measured temperature of up to 6% at 200ºC and up to 14% at 500ºC. Calculations of the temperature deviation with the proposed model are performed as a function of temperature and as a function of the first order component of electrical signal.

161. Guidance for the Evaluation of Direct-Reading Gas and Vapor Monitors

2006 ◽  
Author(s):  
E. Kennedy ◽  
M. Woebkenberg ◽  
P. Schlecht ◽  
D. Bartley ◽  
S. Shulman ◽  
...  
Keyword(s):  
Direct Reading
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