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Published byBlaze Thomas Modified over 8 years ago
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RADHAZ Material Outline Introduction and Background Standards and Applications Prediction of Electromagnetic Fields Measurement of Electromagnetic Fields Protective Devices Procedures to Protect People FCC Initiative in New Rule Making
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Power Densities Measured Around the United States
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Power Densities of Interest watts/cm 2 Milli Pico Watt/cm 2 Receiver 1 X 10 -15 Sensitivity Threshold 1 X 10 -9 Nano Watt/cm 2 Light from Venus 1 X 10 -6 Micro Watt/cm 2 Light from Full Moon 1 X 10 -3 Milli Watt/cm 2 IEEE LIMIT (30-300 MHz) 5 X 10 -3 5 Milli Watt/cm 2 FDA LIMIT On Microwave Ovens 100 X 10 -3 100 Milli Watt/cm 2 Sun Light NO TIME LIMIT
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Conversion of SAR to Power Density Threshold for Hazard Specific Absorption Rate (SAR) = 4 Watts/kg Applying a Safety Factor 10 (SAR) = 0.4 Watts/kg CONVERTING to POWER DENSITY: for HUMAN EXPOSURE Average Man or Woman WEIGHT = 60 kg SURFACE AREA = 20,000 cm 2 PH = POWER DENSITY for SAFETY THRESHOLD PH = 0.4 Watts/kg = 1.2 milli Watts/(cm) 2
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Band Definitions VLF< 15 KHz LF15 - 500 KHz MF300 - 3000 KHz HF2 - 30 MHz VHF30 - 225 MHz UHF225 - 800 MHz L-Band800 - 1650 MHz S-Band1650 - 3000 MHz C-Band3000 - 7200 MHz X-Band7200 - 10,500 MHz Ku-Band10,500 - 16,000 MHz K-Band16,000 - 26,000 MHz Ka-Band26,000 - 40,000 MHz V-Band36,000 - 52,000 MHz
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Transmit Power of Various Systems AM RadioMF - HF500 - 50 KW FM RadioVHF5 - 30 KW TVLow VHF (Channels 1-6)3 - 10 KW TVHigh VHF (Channels 7-13)10 - 100 KW TVUFH (Channels 14-89)1000 - 5000 KW RadarPeak Power (UHF-Ka-Band)50 - 5000 KW RadarAverage Power100 - 5 KW
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Human Response to RF Levels REFERENCE 1 Watt/kgBasal Metabolism Rate 1.4 Watt/kgResting Metabolism Rate 5-8 Watt/kgExercise 18 Watt/kgMaximal Exercise Lying on Beach Sunning80 - 100 milli Watts/cm 2 Threshold of Feeling (2300 MHz)26 milli Watts/cm 2 Threshold of Feeling (infrared)1.6 milli Watts/cm 2
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Occupational Distribution
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Hazards Electromagnetic Radiation To Personnel (HERP) Fuels (HERF) Ordnance (HERO)
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Controlling Documentation on Safety FCC OET Bulletin 65 FCC Report & Order 96-326 ANSI/IEEE C95.1-1992 DoD Inst 6055.11 Personnel Exposure NAVSEA OP3565/NAVAIR 16-1-529 Vol I HERP and HERF Limits NAVSEA OP3565/NAVAIR 16-1-529 Vol II HERO Limits
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FCC Limits for Maximum Permissible Exposure (MPE) Plane-wave Equivalent Power Density
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FCC Limits for Occupational/Controlled Exposure
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FCC Limits for General Population/Uncontrolled Exposure
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IEEE Maximum Permissible Exposure for Controlled Environments Part A Electromagnetic Fields 1 2 3 4 5 Frequency Electric Field Magnetic Field Power Density (s) Averaging Range Strength (E) Strength (H) E = Field, H-Field Time (MHz) (V/m) (A/m) (mW/cm 2 ) |E| 2, |H| 2 or S (minutes) 0.003 - 0.1 614 163 (100, 1 000 000) 6 0.1 - 3.0 614 16.3/ (100, 10 000/ 2 ) 6 3 - 30 1842/ 16.3/ (900/f 2, 10 000/f 2 ) 6 30 -100 61.4 16.3/ (1.0, 10 000/f 2 ) 6 100 - 300 61.4 0.163 1.0 6 300 - 3000 /300 6 3000 - 15000 10 6 15000 - 300000 10 616 000/f 1.2
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IEEE Maximum Permissible Exposure for Uncontrolled Environments Part A Electromagnetic Fields 1 2 3 4 5 Frequency Electric Field Magnetic Field Power Density (s) Averaging Range Strength (E) Strength (H) E = Field, H-Field Time (MHz) (V/m) (A/m) (mW/cm 2 ) |E| 2, S or |H| 2 (minutes) 0.003 - 0.1 614 163 (100, 1 000 000) 6 6 0.1 - 1.34 614 16.3/ (100, 10 000/ 2 ) 6 6 1.34 -3.0 823.8/ 16.3/ (180/f 2, 10 000/ 2 ) f 2 /0.3 6 3.0 - 30 823.8/ 16.3/ (180/f 2, 10 000/ 2 ) 30 6 30 - 100 27.5 158.3/ 1.668 (0.2, 940 000/ 3.336 ) 30 0.0636 1.337 100 - 300 27.5 0.0729 0.2 30 30 300 - 3000 /1500 30 3000 - 15000 /1500 90 000/ 15000 - 300000 10 616 000/ 1.2
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Near Field and Transition Zone Distance Calculation Where, N = Extent of Near Field Zone, Meters T = Extent of Transition Zone, Meters D = Antenna Diameter, Meters = Wavelength, Meters
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Near Field Calculation Where, PD = Near Field Power Density, Watts/(meter) 2 P = Power Output of System, Watts E = Antenna Efficiency, Number (one or less) A = Antenna Area, (meter) 2
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Transition Zone Calculation Where, (PDT) = Transition Zone Power Density,Watts/(meter) 2 (PD) = Power Density in Near FIeld, Watts/(meter) 2 R = Distance to Point of Interest, Meters N = Near Field Zone Distance, Meters
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Far Field and Off-Axis Calculation Where, PDF = Power Density in the Far Field or Off-Axis in the Near Field or Transition Zone, Watts/(meter) 2 P = Power Delivered to the Antenna, Watts G = Gain of the Antenna Relative to an isotropic in the direction of Interest, Number R = Distance to the Point of Interest, meters
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