Optical Spectral Radiometric/Laser Reflectance Method For Noninvasive Measurement Of Weld Pool Surface Temperatures

H. G. Kraus

doi:10.1117/12.7977153

1 December 1987 Optical Spectral Radiometric/Laser Reflectance Method For Noninvasive Measurement Of Weld Pool Surface Temperatures

H. G. Kraus

Author Affiliations +

Optical Engineering, Vol. 26, Issue 12, 261283 (December 1987). https://doi.org/10.1117/12.7977153

Abstract

A unique experimental method has been developed for measuring weld pool surface temperatures. An equation for determining temperature was developed based on Planck's blackbody spectral distribution of emissive power, the definition of spectral directional emissivity, Lambert's cosine law for diffuse emitters, and Kirchhoff's law for spectral directional reflectivity. The necessary measurements are the spectral directional emissive power and the spectral directional emissivity of the weld pool surface. Detailed pool surface temperature measurements were made of gas tungsten arc (GTA) welding of 1.5mm thick stainless steel (SS) 304 plates using an argon cover gas. Because argon plasma arc spectroscopy measurements over molten SS 304 revealed insufficient emission gaps, the spectral emissive power was measured by high speed film radiometry as the arc was shut off so as to obtain information at the instant the obscuring arc emissions disappear. Similar measurements were made of the spectral directional reflectivity (and thus the spectral directional emissivity) by reflecting a focused laser beam off the weld pool. Detailed weld pool surface temperature maps were generated.

Citation Download Citation

H. G. Kraus "Optical Spectral Radiometric/Laser Reflectance Method For Noninvasive Measurement Of Weld Pool Surface Temperatures," Optical Engineering 26(12), 261283 (1 December 1987). https://doi.org/10.1117/12.7977153

Published: 1 December 1987

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