By Gerald C. Holst
ISBN-10: 0819437220
ISBN-13: 9780819437228
Copublished with JCD Publishing. Thorough rationalization of warmth move, with options supported by means of thermograms. meant for all who paintings with thermal imaging platforms: researchers, approach designers, try out engineers, revenues employees, and armed forces and civilian finish users.Contents - creation - warmth - Blackbody radiation - Emissivity - Atmospheric transmittance - digital camera layout - functionality parameters - digicam choice - Observer education - creation to purposes - goal Signatures - Temperature measurements - construction envelope inspections - Roof inspections - strength distribution - Electrical/Mechanical Inspection - Buried items - Surveillance - Nondestructive trying out - method/ qc - Inspection approaches - Appendix A: Temperature conversion - Appendix B: Emissivity - Appendix C: Thermal Sensing and Imaging - Index
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Additional resources for Common Sense Approach to Thermal Imaging (SPIE Press Monograph Vol. PM86)
Sample text
Construction engineers rewrite Equation 2-4 as 30 Common sense approach to thermal imaging The ratio W k is the thermal resistance. When Q, t, T,-TI,A, and L are expressed in BTU, hours, OF, feet2,and feet respectively, then L% is the R-value. The R-value is convenient because it expresses both thermal conductivity and thickness as a single number: L R- value = - = (G- 4 )-#2~ - / i P O ~ BTU Q/ The key to insulation is to use low k value material. As k decreases, we can use thinner insulation to obtain the same R-value.
Since radiation theory is so important in thermal imaging system operation, the following two chapters are dedicated to the subject. Heat transfer by radiation occurs at the speed of light whereas conduction and convection depend upon the specific material involved. Radiation takes place across a vacuum whereas conduction and convection cannot. This is apparent with the sun. Space is nearly a vacuum yet we can feel the sun's heat. Similarly, the sun's radiation can pass through a glass window and we can feel the heat independent of the actual air temperature.
Table 2-6 CORRECTION FACTORS for a VERTICAL PLATE (From reference 1) mls 1 Wind speed k ~ h k n o t s 1 m ~ h Correction factor 34 Common sense approach to thermal imaging WIND SPEED (mls) Figure 2-10. Typical decrease in temperature differential as a h c t i o n of wind speed. Without wind, the AT of the vertical plate is 50°C. , power lines) will exhibit different wind dependencies. 3. RADIATION All objects radiate heat. The amount of heat depends upon the object's temperature and surface condition.