Development of two color imaging pyrometer for studying thermal history of laser metal deposition

Author

Niroop Matta

Abstract

"The laser aided manufacturing process is a process in which parts are built by adding material into the melt pool created by a laser. This process involves a complex thermal history which is important in determining the quality of the parts built. The objective of this study is to develop a high resolution two color imaging pyrometer which can measure the temperature of an object without the dependence of spectral emissivity of the material at an economical price. An 8.8 MP CMOS sensor is used as an imaging sensor. The visible spectrum of light is used for temperature measurement. The imaging pyrometer is calibrated and compared to a commercially available thermocouple, pyrometer and infrared camera. It is used to measure the temperature during the laser deposition process. The temperatures of the melt pool during laser scan without addition of material for different laser powers are measured. The temperatures during the deposition process while material is being added are also measured. The results obtained shows that the two color imaging pyrometer developed is able to measure the temperatures with better accuracy without known emissivity than long wave infrared cameras which are highly dependent on the emissivity for accurate measurement"--Abstract, page iii.

Advisor(s)

Liou, Frank W.

Committee Member(s)

Newkirk, Joseph William
Kinzel, Edward C.

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Manufacturing Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2015

Pagination

viii, 46 pages

Note about bibliography

Includes bibliographical references (page 45).

Rights

© 2015 Niroop Matta, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Thesis Number

T 11199

Print OCLC #

1022846436

Electronic OCLC #

1014181782

Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

Recommended Citation

Matta, Niroop, "Development of two color imaging pyrometer for studying thermal history of laser metal deposition" (2015). Masters Theses. 7707.
https://scholarsmine.mst.edu/masters_theses/7707