Understanding Infrared Thermography Reading 7 Part 2 of 2.pdf

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With the introduction of computer-assisted thermal image storage and processing, thermography has become a far more exact science, and the ability to perform image analysis and trend analysis has greatly expanded its reach. Innovative software has been tailored specifically for detailed image and thermal data analysis, and has been rapidly updated and expanded. Most software packages for thermography image analysis and diagnostics offer a number of standard features. These include spot temperature readout, multiple X and Y analog traces, monochrome and multiple-color scale selection, image shift, rotation and magnification, area analysis with histogram display, image averaging and filtering, and permanent disk storage and retrieval. Some of these capabilities are offered as part of the basic instrument and some are found in a diagnostics package offered separately. Charlie Chong/ Fion Zhang
The newest field-portable instruments allow the thermographer to store images to disc (or data card) during field measurements, and perform detailed image analysis upon return to home base (see Section 2 for details). The ability to perform differential thermography is a most powerful feature of thermographic software routines. This is the capability for archiving thermal images of acceptable operating components, and assemblies and mechanisms, and using these stored images as models for comparison to subsequently inspected items. Subtractive routines produce differential images, illustrating the deviation of each pixel (picture element) from its corresponding model. Another powerful routine that was recently introduced is an emissivity determination and correction program, which produces true surfacetemperature thermograms of microelectronic devices and other very small targets. Keywords: Subtractive routines Charlie Chong/ Fion Zhang
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Infrared Thermal Testing Reading VI
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6.1 Basic Elements An in-house prog
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6.1.4 Responsibilities This section
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IR Viewing Window - Opaque Polymer
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6.1.8 Acceptance Criteria All surve
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6.1.9 Reporting Criteria A rigid pr
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6.1.10 Qualification of Personnel P
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EPRI Licensed Material Basic Elemen
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7. TRAINING AND CERTIFICATION This
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Recommended training and certificat
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■ Level II A Level II infrared th
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The experience and education recomm
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B. Spatial Resolution • the conce
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D. Equipment Operation • Be able
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The PdM basic examination is more s
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Appendix-A The Science Of Thermogra
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Erroneous conclusions can have an e
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A.2.1 Heat and Temperature What is
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To convert changes in temperature o
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A.2.3 The Three Modes of Heat Trans
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The Fourier Conduction Law: Q/A Q =
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A.2.5 Convection Convective heat tr
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Figure A-2 Convective Heat Flow Cha
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A.2.6 Radiation Radiative heat tran
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A.2.7 Radiation Exchange at the Tar
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Charlie Chong/ Fion Zhang
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Figure A-4 Radiative Heat Flow W ε
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A.2.8 Specular and Diffuse Surfaces
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Specular or Diffuse Surfaces Diffus
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Specular and Diffuse Surfaces Confu
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Specular reflection is the mirror-l
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Reflections off Specular and Diffus
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The thermogram of the outside surfa
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Steady-state conduction Steady stat
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A.3 The Basic Physics of Infrared R
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A.3.1 Some Historical Background Th
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A.3.3 The Target Surface The chart
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Figure A-6 shows the distribution o
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Charlie Chong/ Fion Zhang
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Two physical laws define the radian
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According to (2), the wavelength at
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Figure A-7 Spectral Distribution of
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Figure A-8 shows that the instrumen
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If the emissivity of a gray body is
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Under certain conditions, an error
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EXAM score! Non-graybody (colored b
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Figure A-10 illustrates the spectra
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Figure A-10 Infrared Transmission o
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Figure A-11 Infrared Spectral Trans
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Figure A-11 shows transmission curv
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EXAM score! Glass is opaque λ > 5
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Figure A-12 Characteristics of IR T
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The characteristics of the window m
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IR Lenses - LWIR Len Charlie Chong/
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IR Lenses - Fresnel Len Charlie Cho
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Figure A-13 Components of an Infrar
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Infrared optics are available in tw
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All infrared detector-transducers e
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Figure A-14 Typical Infrared Radiat
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Germanium Len Charlie Chong/ Fion Z
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Thermopile Detector Charlie Chong/
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The IR Detectors Infrared detectors
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Figure A-15 Spectral Sensitivity of
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The Mercury- Cadmium-telluride (Hgc
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The Mercury- Cadmium-Telluride (HgC
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Point-sensing instruments for measu
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A.3.6.1 Line Scanning The purpose o
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A.3.6.2 Two-Dimensional Scanning Th
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Opto-mechanical Scanner A typical c
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Electronic scanning Electronic scan
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Figure A-18 Schematic of a Typical
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Applications for infrared FPAs incl
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Staring Charlie Chong/ Fion Zhang
Page 167 and 168: A.4.1 Point-Sensing Instruments For
Page 169 and 170: Temperature sensitivity is also cal
Page 171 and 172: EXAM score! thermal resolution (≠
Page 173 and 174: NETD - Noise Equivalent Temperature
Page 175 and 176: Figure A-19 Instrument Speed of Res
Page 177 and 178: Figure A-20 Fields of View of Infra
Page 179 and 180: Figure A-20 Fields of View of Infra
Page 181 and 182: The output requirements are totally
Page 183 and 184: Spectrally selective instruments em
Page 185 and 186: Figure A-21 Spectral Filtering for
Page 187 and 188: Figure A-22 shows a similar solutio
Page 189 and 190: A.4.2 Scanners and Imagers.Qualitat
Page 191 and 192: • Total field of view (TFOV): the
Page 193 and 194: Despite some manufacturers’ claim
Page 195 and 196: A.4.3.1 Temperature Sensitivity, Mi
Page 197 and 198: Figure A-23 Test Setup for MRTD Mea
Page 199 and 200: A.4.3.2 Spot Size (FOV) , Instantan
Page 201 and 202: ■ A standard 4 bar (slit) resolut
Page 203 and 204: Both MRTD and MTF are functions of
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Page 207 and 208: IFOVmeas: The slit width at which t
Page 211 and 212: FPA Charlie Chong/ Fion Zhang http:
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Page 215 and 216: A.4.3.3 Speed of Response and Frame
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Page 221 and 222: Appendix B Measuring Emissivity, Re
Page 223 and 224: Figure B-1 Target Radiosity Charlie
Page 225 and 226: The reference emitter technique wor
Page 227 and 228: 1. Apply the reference emitter (E)
Page 229 and 230: B.2.2 Reflective Emissivity Techniq
Page 231 and 232: Figure B-3 Using the Reflective Emi
Page 233 and 234: Figure B-4 Using the Transmittance
Page 235 and 236: Appendix C Quick Reference Charts A
Page 237 and 238: MTF Determination Using An Ir Image
Page 239 and 240: Measuring And Setting Effective Emi
Page 241 and 242: Classification Of Faults (Guideline
Page 245 and 246: Reading: Four Emissivity: Understan
Page 247 and 248: Figure 1 shows a typical three-phas
Page 249 and 250: Figure IR1: Corresponding infrared
Page 251 and 252: Thermal radiation and properties of
Page 253 and 254: The thermal nature of materials. Ma
Page 255 and 256: So in plain English, when the therm
Page 257 and 258: Figure 2: Stainless steel block. (a
Page 259 and 260: Observed with our thermal imager (w
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Page 263 and 264: How can the thermal imager’s read
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Charlie Chong/ Fion Zhang http://ww
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Using a narrow band filter to measu
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Emissivity, the variable’s variab
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Emissivity and electrical equipment
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In manufacturing processes, steel o
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In this case, we have another power
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Figure IR1: Corresponding infrared
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Figure 7: Measuring the loads on a
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Summary Predictive maintenance PDM
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It is much like most endeavors in l
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Good Luck Charlie Chong/ Fion Zhang
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Charlie https://www.yumpu.com/en/br
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