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Bat navigating a cave using ultrasound
A bat navigating a cave using ultrasound

Bio and non bio-inspired sensors

Bio inspired sensors

The ultrasonic sensor system is similar to that used by bats. Dolphins also use ultrasound for sensing and communication. Other biologically inspired sensors are possible.

Whiskers - on cats, moles, seals

  • Allow physical detection of objects
  • Allow animal to move through narrow passage

Robots can have wires which act the same way.

Noses - various animals can detect odours

  • Electronic ‘noses’ have been made

Electric eels, sharks, rays, catfish can all detect electric fields. Birds detect magnetic fields for navigation. Many animals use visible light… but that requires processing.

Some birds navigate using the Earth’s magnetic field – and for robots we can have devices called magnetometers, which can measure the strength of, and sometimes, the direction of magnetic fields.

Non bio-inspired sensors

Recently man has developed lots of other sensors:

  • Infra-red
  • Laser range finders
  • Microwaves
  • Radar
  • Terahertz

These are similar to ultrasonic in that it emits a signal, and awaits echoes – hence you can determine position. Sometimes if you want to detect changes – how quickly is position changing – the speed of the object. The so called continuous wave radar does this.

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