Understanding Infrared Thermography Reading 7 Part 2 of 2.pdf

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Charlie Chong/ Fion Zhang
The characteristics of the window material will always have some effect on the temperature measurement, but the attenuation can always be corrected by pre-calibrating the instrument with a sample window placed between the instrument and a target of known temperature. In closing the discussion of the transmitting medium, it is important to note that infrared sensors can only work when all of the following spectral ranges coincide or overlap: 1. The spectral range over which the target emits 2. The spectral range over which the medium transmits 3. The spectral range over which the instrument operates 3 2 1 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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Page 61 and 62: Figure A-4 Radiative Heat Flow W ε
Page 63 and 64: A.2.8 Specular and Diffuse Surfaces
Page 65 and 66: Specular or Diffuse Surfaces Diffus
Page 67 and 68: Specular and Diffuse Surfaces Confu
Page 69 and 70: Specular reflection is the mirror-l
Page 71 and 72: Reflections off Specular and Diffus
Page 73 and 74: The thermogram of the outside surfa
Page 75 and 76: Steady-state conduction Steady stat
Page 77 and 78: A.3 The Basic Physics of Infrared R
Page 79 and 80: A.3.1 Some Historical Background Th
Page 81 and 82: A.3.3 The Target Surface The chart
Page 83 and 84: Figure A-6 shows the distribution o
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Page 87 and 88: Two physical laws define the radian
Page 89 and 90: According to (2), the wavelength at
Page 91 and 92: Figure A-7 Spectral Distribution of
Page 93 and 94: Figure A-8 shows that the instrumen
Page 95 and 96: If the emissivity of a gray body is
Page 97 and 98: Under certain conditions, an error
Page 99 and 100: EXAM score! Non-graybody (colored b
Page 101 and 102: Figure A-10 illustrates the spectra
Page 103 and 104: Figure A-10 Infrared Transmission o
Page 105 and 106: Figure A-11 Infrared Spectral Trans
Page 107 and 108: Figure A-11 shows transmission curv
Page 109 and 110: EXAM score! Glass is opaque λ > 5
Page 111: Figure A-12 Characteristics of IR T
Page 115 and 116: IR Lenses - LWIR Len Charlie Chong/
Page 117 and 118: IR Lenses - Fresnel Len Charlie Cho
Page 119 and 120: Figure A-13 Components of an Infrar
Page 121 and 122: Infrared optics are available in tw
Page 123 and 124: All infrared detector-transducers e
Page 125 and 126: Figure A-14 Typical Infrared Radiat
Page 127 and 128: Germanium Len Charlie Chong/ Fion Z
Page 129 and 130: Thermopile Detector Charlie Chong/
Page 139 and 140: The IR Detectors Infrared detectors
Page 141 and 142: Figure A-15 Spectral Sensitivity of
Page 143 and 144: The Mercury- Cadmium-telluride (Hgc
Page 145 and 146: The Mercury- Cadmium-Telluride (HgC
Page 151 and 152: Point-sensing instruments for measu
Page 153 and 154: A.3.6.1 Line Scanning The purpose o
Page 155 and 156: A.3.6.2 Two-Dimensional Scanning Th
Page 157 and 158: Opto-mechanical Scanner A typical c
Page 159 and 160: Electronic scanning Electronic scan
Page 161 and 162: 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
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A.4.2 Scanners and Imagers.Qualitat
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• Total field of view (TFOV): the
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Despite some manufacturers’ claim
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A.4.3.1 Temperature Sensitivity, Mi
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Figure A-23 Test Setup for MRTD Mea
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A.4.3.2 Spot Size (FOV) , Instantan
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■ A standard 4 bar (slit) resolut
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Both MRTD and MTF are functions of
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IFOVmeas: The slit width at which t
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FPA Charlie Chong/ Fion Zhang http:
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FPA Charlie Chong/ Fion Zhang
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A.4.3.3 Speed of Response and Frame
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A.4.4 Thermal Imaging Software In o
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The newest field-portable instrumen
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Appendix B Measuring Emissivity, Re
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Figure B-1 Target Radiosity Charlie
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The reference emitter technique wor
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1. Apply the reference emitter (E)
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B.2.2 Reflective Emissivity Techniq
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Figure B-3 Using the Reflective Emi
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Figure B-4 Using the Transmittance
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Appendix C Quick Reference Charts A
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MTF Determination Using An Ir Image
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Measuring And Setting Effective Emi
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Classification Of Faults (Guideline
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Reading: Four Emissivity: Understan
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Figure 1 shows a typical three-phas
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Figure IR1: Corresponding infrared
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Thermal radiation and properties of
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The thermal nature of materials. Ma
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So in plain English, when the therm
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Figure 2: Stainless steel block. (a
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Observed with our thermal imager (w
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Can you see my eye glasses in the i
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How can the thermal imager’s read
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When we remove the block from the o
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In this experiment we see that the
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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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