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RADHAZ Material Outline Introduction and Background Standards and Applications Prediction of Electromagnetic Fields Measurement of Electromagnetic Fields.

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Presentation on theme: "RADHAZ Material Outline Introduction and Background Standards and Applications Prediction of Electromagnetic Fields Measurement of Electromagnetic Fields."— Presentation transcript:

1 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

2 Power Densities Measured Around the United States

3 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

4 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

5 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

6 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

7 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

8 Occupational Distribution

9 Hazards Electromagnetic Radiation To  Personnel (HERP)  Fuels (HERF)  Ordnance (HERO)

10 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

11 FCC Limits for Maximum Permissible Exposure (MPE) Plane-wave Equivalent Power Density

12 FCC Limits for Occupational/Controlled Exposure

13 FCC Limits for General Population/Uncontrolled Exposure

14 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

15 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 

16 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

17 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

18 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

19 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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