The Electromagnetic Spectrum

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The Electromagnetic Spectrum

• Optics and Photonics is an enabling technology

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Radio Waves

• Power Transmission
• Radio Broadcasts

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Radio Astronomy
http//www.ovsa.njit.edu/
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Microwaves
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Microwaves
Microwave source (Magnetron) melted a candy bar
in Spencers pocket. The next day, he put an egg
near the microwave source. It cooked and
exploded.. The rest is history
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Microwaves
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Terahertz (THz)

• Non-destructive Evaluation
• Security Screening

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Picometrix NDE of Space Shuttle

• SOFI (Sprayed On Foam Insulation)
• Insulates external tank
• 2 to 10 inches thick
• Can break off during launch
• Non-destructive evaluation (NDE) desired to
  validate tank
• New NDE technique required
• lt2 mm lateral resolution
• Sensitive to voids and disbonds

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High Resolution Imaging 5x
400 x 400 mm
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T-Ray Image of Natural Voids
Space between stringers clear of voids or defects
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Concealed Threats in Packaging
TRANSMISSION
Plastic knife and metal razor blade identified
through packaging
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Concealed Threats in Clothing
REFLECTION
Knife in shirt pocket
Explosive simulant
Unmodified
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Infrared Thermal Imaging
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Infrared Thermal Imaging
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Vegetation Mapping
http//speclab.cr.usgs.gov
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Visible - Oximeter
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Visible - Oximeter
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UV-Sun/ Crab Nebula
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X-rays
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X-ray
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X-ray