Understanding Infrared Thermography Reading 7 Part 2 of 2.pdf

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MEASURING IFOV meas OF AN IMAGER USING THE SLIT RESPONSE FUNCTION (SRF) Charlie Chong/ Fion Zhang
Classification Of Faults (Guidelines) Relating To 50% Of Maximum Load Joule.s Law: P = I 2 R. Use this to proportion the temperature rise to 50% of the load. For example: At 20% of load, an 8°C rise is seen. To proportion it to 50% of load, multiply by the square of the load ratio as follows: (50/20)² = 6.25; 6.25 x 8°C = 50°C equivalent temperature rise 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
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A.4.1 Point-Sensing Instruments For
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Temperature sensitivity is also cal
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EXAM score! thermal resolution (≠
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NETD - Noise Equivalent Temperature
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Figure A-19 Instrument Speed of Res
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Figure A-20 Fields of View of Infra
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Figure A-20 Fields of View of Infra
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The output requirements are totally
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Spectrally selective instruments em
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Figure A-21 Spectral Filtering for
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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
Page 205 and 206: Charlie Chong/ Fion Zhang
Page 207 and 208: IFOVmeas: The slit width at which t
Page 211 and 212: FPA Charlie Chong/ Fion Zhang http:
Page 213 and 214: FPA Charlie Chong/ Fion Zhang
Page 215 and 216: A.4.3.3 Speed of Response and Frame
Page 217 and 218: A.4.4 Thermal Imaging Software In o
Page 219 and 220: The newest field-portable instrumen
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: Measuring And Setting Effective Emi
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
Page 261 and 262: Can you see my eye glasses in the i
Page 263 and 264: How can the thermal imager’s read
Page 265 and 266: When we remove the block from the o
Page 267 and 268: In this experiment we see that the
Page 269 and 270: Charlie Chong/ Fion Zhang http://ww
Page 271 and 272: Using a narrow band filter to measu
Page 273 and 274: Emissivity, the variable’s variab
Page 275 and 276: Emissivity and electrical equipment
Page 277 and 278: In manufacturing processes, steel o
Page 279 and 280: In this case, we have another power
Page 281 and 282: Figure IR1: Corresponding infrared
Page 283 and 284: Figure 7: Measuring the loads on a
Page 285 and 286: Summary Predictive maintenance PDM
Page 287 and 288: It is much like most endeavors in l
Page 289 and 290: Good Luck Charlie Chong/ Fion Zhang
Page 291:
Charlie https://www.yumpu.com/en/br
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