Comparisons of thermal radiation characteristics between rocks and PMMA subjected to free-fall impacts

Lixin Wu; Yuhua Wu; Wenzhong Shi; Sheng Zhong; Daqing Ge

doi:10.1117/12.602149

28 March 2005 Comparisons of thermal radiation characteristics between rocks and PMMA subjected to free-fall impacts

Lixin Wu, Yuhua Wu, Wenzhong Shi, Sheng Zhong, Daqing Ge

Proceedings Volume 5782, Thermosense XXVII; (2005) https://doi.org/10.1117/12.602149
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

Utilizing the Thermal Infrared (TIR) imaging technology, the transient process of solids (Three kinds of rocks and one kind of PMMA) impacted by free-falling steel balls are monitored with an infrared camera. It is discovered that: (1) as for rock materials, the increments of IR temperature (both the maximum and average, i.e., ΔT_max and ΔT_avr) are all linear related to the impacting height, the difference are the statistical correlation coefficients (R): relatively homogeneous rock (marble, R=0.93~0.95); non-homogeneous rocks (granite: R=0.88~0.92; gabbro: R=0.80~0.84); while for PMMA, there exists a critical height (h≈5m), within this height, ΔT_max is quadratic related and ΔT_avr is linear related to the impacting height, and when above this critical height, both ΔT_max and ΔT_avr are linear related, comparison to rocks, the statistical correlation coefficients are somewhat higher (R=0.94~0.96); (2) the amplitude of IR temperature increments are different, it is somewhat less of IR temperature variations for relatively hard rocks (granite) than others (gabbro, marble and PMMA), for example, when impacted at a height of 2 meter with a standard ball (1 inch in diameter), the higher ΔT_max≈2~4K, while others are within 1K, and (3) it is verified that the parameters about the impaction could be well inversed qualitatively to quantitatively, not only the type of rocks can be identified exactly, but also the impacting height can be accurately estimated especially for the relatively homogenous materials, as for marble rock and PMMA, the relative mean errors of inversion are less than 11.3% and 6.2%, respectively.

Citation Download Citation

Lixin Wu, Yuhua Wu, Wenzhong Shi, Sheng Zhong, and Daqing Ge "Comparisons of thermal radiation characteristics between rocks and PMMA subjected to free-fall impacts", Proc. SPIE 5782, Thermosense XXVII, (28 March 2005); https://doi.org/10.1117/12.602149

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Polymethylmethacrylate

Infrared imaging

Infrared radiation

Solids

Infrared cameras

Analytical research

Error analysis

Show All Keywords

Keywords/Phrases

Search In:

Publication Years