MECHANICAL MEASUREMENTS

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MECHANICAL MEASUREMENTS
Prof. Dr. Ing. Andrei Szuder Tel.
40.2.1.4112604 Fax. [phone] www.labsmn.pub.
ro szuder_at_labsmn.pub.ro
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INSTRUMENTATION EXAMPLES
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Designing for Stealth

• Radar Stealth is only one aspect of an aircraft
  ability to avoid detection
• Other factors include
• Sound
• Sight
• Heat
• Leakage of electronic signals
• Basics known since the 50s
• Computer power to do the designs available since
  the 70s

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Shape Construction

• Early stealth aircraft like the F117 relied on
  faceting to reflect power away from the source
• Good for monostatic radar but not effective
  against bistatic or multistatic systems

• Multi layered composites matched to the impedance
  of free space
• Layers progressively absorb the radiation called
  RAM
• Windows covered with conductive films to minimise
  radiation penetration
• Air intakes covered with mesh or convoluted to
  ensure multi bounce

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CT IMAGE HUMAN HEAD
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MRI Image
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Functional MRI Image of Brain Function based on
Oxygenated Blood Flow Levels
Thinking of Frogs
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3D Ultrasound Movies

• Voluson 730D Fast 3D Ultrasound machine
• Allow the study of foetal behaviour and movement
• May improve the rate of early abnormality
  detection
• Cost 300-350k

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3D Sonar Imaging

• Sophisticated 2D sonar arrays such as the one
  developed by Thomson Marconi Sonar (TMS) in
  Sydney can produce short range 3D images with
  voxol resolutions down to 1x1x1mm
• A group of 3 uniformly spaced transmitters
  illuminates the target with high frequency
  (gt1MHz) sound pulses.
• A sparse phased array made up of 84 tiles each
  made up of a random pattern of 32 hydrophone
  receivers receives the echo.

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Sonar Images
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3D Ground Penetrating Radar

• High resolution GPS images are made by
  synthesising the image using SAR techniques
  discussed earlier
• If a number of slices are produced side-by-side
  as with the axial tomography method, then a
  composite 3D image can be constructed
• This requires that the position of the GPR be
  well registered using differential GPS.
• The following images made by Dean Goodman in
  Japan show a circular tomb and contents.
• The use of GPR for archaeological surveys
  eliminates the damage caused by exploratory
  trenches that were employed in the past.

1100 yr old burial chamber