ee 587 presentation gyroscope used as rate sensor instructor: dr. lumpp presenter: wei lu
TRANSCRIPT
EE 587 PresentationEE 587 PresentationGyroscope Used As Rate Sensor
Instructor: Dr. Lumpp Presenter: Wei Lu
What Is A GyroscopeWhat 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 IssueHistorical IssueThe 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 EffectGyroscopic Effect
A straightforward observation:
Coriolis effectExamples:
River bank
Train’s wheels
Gyroscope Vs. Rate SensorGyroscope 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 SensorMerits of Gyro As Rate Sensor
Low power consumption,High sensitivity, Low temperature drift, Good stability
Principle of GyroPrinciple 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 GyroPrinciple 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 GyroPrinciple of Gyro
More details can be found at:
http://www.gyro-scope.co.uk/how.htm
Some Types of Gyro Rate SensorSome Types of Gyro Rate Sensor
Example 1:
Manufacturer: NEC/TOKIN
Model: CG-16D, CG-L43
NEC/TOKIN CG-16D, CG-L43NEC/TOKIN CG-16D, CG-L43
Appearance:
NEC/TOKIN CG-16D, CG-L43NEC/TOKIN CG-16D, CG-L43
NEC/TOKIN CG-16D, CG-L43NEC/TOKIN CG-16D, CG-L43
NEC/TOKIN CG-16D, CG-L43NEC/TOKIN CG-16D, CG-L43 Vibrating Element Structure
NEC/TOKIN CG-16D, CG-L43NEC/TOKIN CG-16D, CG-L43
Shape and Dimension
NEC/TOKIN MDP-A3U7NEC/TOKIN MDP-A3U7
Example 2:
Manufacturer: NEC/TOKIN
Model: 3D Motion Sensor MDP-A3U7
NEC/TOKIN MDP-A3U7NEC/TOKIN MDP-A3U7
Appearance:
NEC/TOKIN MDP-A3U7NEC/TOKIN MDP-A3U7
NEC/TOKIN MDP-A3U7NEC/TOKIN MDP-A3U7Specifications
NEC/TOKINNEC/TOKIN
For more information, visit the website:
www.tokin.com
MURATA GYROSTAR ENC-03JAMURATA GYROSTAR ENC-03JAExample 3: Manufacturer: MURATA
Model: GYROSTAR ENC-03JA
MURATA GYROSTAR ENC-MURATA GYROSTAR ENC-03JA03JA
Appearance:
MURATA GYROSTAR ENC-03JAMURATA GYROSTAR ENC-03JAOutline:
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-03JAMURATA 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-in-AGC circuit
MURATA GYROSTAR ENC-03JAMURATA GYROSTAR ENC-03JA
Applications
1. Detecting hand movement involved in video and still camera
2. Detecting vibrations in various vibration free table and isolators3. Detecting the own movement
MURATA GYROSTAR ENC-03JAMURATA GYROSTAR ENC-03JASpecification
MURATA GYROSTAR ENC-03JAMURATA GYROSTAR ENC-03JA
External Dimensions
MURATA GYROSTAR ENC-03JAMURATA GYROSTAR ENC-03JA
Terminal Descriptions
MURATA GYROSTAR ENC-03JAMURATA GYROSTAR ENC-03JA
Application
MURATA GYROSTAR ENC-03JAMURATA GYROSTAR ENC-03JA
For more information, visit the website:
www.murata.com
Some Applications of Gyro SensorsSome Applications of Gyro Sensors
Gyration Wireless Products & Accessories Ultra Mouse: the world's only in-air
motion sensing mouse
Some Applications of Gyro SensorsSome Applications of Gyro Sensors
GyroRemote™: wireless presentation controller with motion-sensing technology
Some Applications of Gyro SensorsSome Applications of Gyro Sensors
Mobile Keyboard: Wireless RF Keyboard with 100-ft. range and Internet/Multimedia hot keys.
ConclusionConclusion
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.