Transcript EE 583 Presentation

EE 587 Presentation
Gyroscope Used As Rate Sensor
Instructor: Dr. Lumpp
Presenter: Wei Lu
What Is A Gyroscope

Gyroscope is a device
consisting of a spinning
mass, typically a disk or
wheel, mounted on a base
so that its axis can turn
freely in one or more
directions and thereby
maintain its orientation
regardless of any
movement of the base.
Historical Issue

The first modern gyroscope was developed in
the first half of the 19th century by the French
physicist jean B. L. Foucault, and its first
notable use was in a visual demonstration of the
earth's rotation.
Gyroscopic Effect

A straightforward observation:
Coriolis effect
 Examples:
River bank
Train’s wheels
Gyroscope Vs. Rate Sensor

The major difference: gyroscope can be mounted
at any position of the rotational frame to sense the
rate of rotation, while the conventional rate sensor
needs to have an aligned shaft to be mounted
exactly at the centre of the rotational frame.
 Conclusion: the conventional rate sensor cannot be
used in navigation systems where the centre of the
rotational frame is unknown.
Merits of Gyro As Rate Sensor

Low power consumption,
 High sensitivity,
 Low temperature drift,
 Good stability
Principle of Gyro
Coriolis force -- the main physical principal to
explain the vibrating gyroscope operation.
In general, when in a rotating frame, there is a
force on all moving objects which is given by:
FCoriolis = -2 m (w x vr)
Where w is angular frequency and vr is radial
velocity.
The direction of Coriolis force is orthogonal to the
velocity vector and the rotation vector.
Principle of Gyro
• The spin axis: the
source of the gyroscopic
effect
• The primary axis:
conceptually the input or
driving axis
• The secondary axis:
output
Principle of Gyro

More details can be found at:
http://www.gyro-scope.co.uk/how.htm
Some Types of Gyro Rate Sensor

Example 1:
Manufacturer: NEC/TOKIN
Model: CG-16D, CG-L43
NEC/TOKIN CG-16D, CG-L43

Appearance:
NEC/TOKIN CG-16D, CG-L43
NEC/TOKIN CG-16D, CG-L43
NEC/TOKIN CG-16D, CG-L43

Vibrating Element Structure
NEC/TOKIN CG-16D, CG-L43
Shape and Dimension
NEC/TOKIN MDP-A3U7

Example 2:
Manufacturer: NEC/TOKIN
Model: 3D Motion Sensor MDP-A3U7
NEC/TOKIN MDP-A3U7

Appearance:
NEC/TOKIN MDP-A3U7
NEC/TOKIN MDP-A3U7

Specifications
NEC/TOKIN
For more information, visit the website:
www.tokin.com
MURATA GYROSTAR ENC-03JA

Example 3:
Manufacturer: MURATA
Model: GYROSTAR ENC-03JA
MURATA GYROSTAR ENC-03JA

Appearance:
MURATA GYROSTAR ENC-03JA

Outline:
This product is offers many excellent features
such as quick-response when detecting a
moving object or the increased flexibility of
installment because of its small and light
weight design
MURATA GYROSTAR ENC-03JA

Features
1. Ultra-small and ultra-lightweight
2. Quick response
3. Low driving voltage, low current
consumption
4. Reliable features achieved by a built-inAGC circuit
MURATA GYROSTAR ENC-03JA

Applications
1. Detecting hand movement involved in
video and still camera
2. Detecting vibrations in various vibration
free table and isolators
3. Detecting the own movement
MURATA GYROSTAR ENC-03JA

Specification
MURATA GYROSTAR ENC-03JA

External Dimensions
MURATA GYROSTAR ENC-03JA

Terminal Descriptions
MURATA GYROSTAR ENC-03JA

Application
MURATA GYROSTAR ENC-03JA
For more information, visit the website:
www.murata.com
Some Applications of Gyro Sensors
Gyration Wireless Products & Accessories
 Ultra Mouse: the world's only in-air
motion sensing mouse
Some Applications of Gyro Sensors

GyroRemote™: wireless presentation
controller with motion-sensing
technology
Some Applications of Gyro Sensors

Mobile Keyboard: Wireless RF Keyboard
with 100-ft. range and
Internet/Multimedia hot keys.
Conclusion
Gyroscope is very useful in many applications.
To chose the right rate gyro sensor, some
features, such as power consumption, weight,
dimension, etc., must be taken into
consideration.