Page 116 - Toucpad robotics C11

Applications in Robotics
Distance Measurement: Accurately measuring the distance to obstacles or surfaces.
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Obstacle Avoidance: Widely used in mobile robots and autonomous vehicles for detecting obstacles and navigating
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around them.
Parking Sensors: Common in cars to help drivers park by detecting nearby objects.
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Mapping: Simple robots can use ultrasonic sensors to create basic maps of their environment by measuring distances
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in various directions.
Level Sensing: Detecting the level of liquid in a tank.
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Advantages

Reliable for Distance Measurement: Provides fairly accurate distance readings over a reasonable range.
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Not Affected by Colour/Light: Unlike infrared sensors, ultrasonic sensors are not significantly affected by the colour
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or transparency of the object, nor by ambient light conditions.
Works in Dark/Smoky Environments: Can operate effectively where vision-based sensors might struggle.
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Disadvantages

Limited Range and Beam Angle: Has a maximum effective range (typically up to a few meters) and a relatively wide
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“cone” or “beam angle” for its sound waves, meaning it might detect objects that are slightly to the side, leading to
less precise angular detection.
Specular Reflection: Smooth, angled surfaces can cause the sound waves to reflect away from the receiver, making
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the object undetectable.
Affected by Temperature/Humidity: The speed of sound changes with temperature and humidity, which can affect
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distance accuracy if not compensated for.
Slower Response: Sound travels slower than light, so its response time can be slower than optical sensors.
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Soft/Fuzzy Materials: Materials that absorb sound (like fabric or foam) can be difficult to detect.
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Some Robots Are Inspired by Animals
Nature is the greatest engineer, and robotics often copies it. Boston Dynamics created
Spot, a robot dog that can climb stairs and carry loads. There are robotic fish for studying
BRAINY marine life, robotic birds for spying or environmental monitoring, and even robotic
FACT
snakes for search missions. These biomimetic designs are more adaptable to real-world
environments, where wheels or simple arms don’t always work. It’s literally robots learning
from Mother Nature.

Light Detection and Ranging (LIDAR) Sensors
Description

Light Detection and Ranging, commonly known as LIDAR, is a remote sensing method
that uses pulsed laser light to measure distances. It’s a highly sophisticated technology,
similar in principle to radar, but using light instead of radio waves. A LIDAR sensor typically
spins or scans, sending out millions of laser pulses per second.

Working Principle
A LIDAR sensor emits rapid pulses of laser light.
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When a laser pulse hits an object, a small portion of the light reflects back to the
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LIDAR sensor’s receiver.

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Touchpad Robotics - XI