ee 587 presentation gyroscope used as rate sensor instructor: dr. lumpp presenter: wei lu

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 Vibrating Element Structure


Shape and Dimension

NEC/TOKIN MDP-A3U7NEC/TOKIN MDP-A3U7

Example 2:

Manufacturer: NEC/TOKIN

Model: 3D Motion Sensor MDP-A3U7


Appearance:

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


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


External Dimensions


Terminal Descriptions


Application


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


GyroRemote™: wireless presentation controller with motion-sensing technology


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.

ee 587 presentation gyroscope used as rate sensor instructor: dr. lumpp presenter: wei lu

Documents