EE 587 Presentation

EE 587 Presentation

EE 587 Presentation

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Presentation Transcript

1. EE 587 Presentation Gyroscope Used As Rate Sensor Instructor: Dr. Lumpp Presenter: Wei Lu

2. 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.

3. 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.

4. Gyroscopic Effect • A straightforward observation: Coriolis effect • Examples: River bank Train’s wheels

5. 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.

6. Merits of Gyro As Rate Sensor • Low power consumption, • High sensitivity, • Low temperature drift, • Good stability

7. 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.

8. 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

9. Principle of Gyro • More details can be found at: http://www.gyro-scope.co.uk/how.htm

10. Some Types of Gyro Rate Sensor • Example 1: Manufacturer: NEC/TOKIN Model: CG-16D, CG-L43

11. NEC/TOKIN CG-16D, CG-L43 • Appearance:

12. NEC/TOKIN CG-16D, CG-L43

13. NEC/TOKIN CG-16D, CG-L43

14. NEC/TOKIN CG-16D, CG-L43 • Vibrating Element Structure

15. NEC/TOKIN CG-16D, CG-L43 Shape and Dimension

16. NEC/TOKIN MDP-A3U7 • Example 2: Manufacturer: NEC/TOKIN Model: 3D Motion Sensor MDP-A3U7

17. NEC/TOKIN MDP-A3U7 • Appearance:

18. NEC/TOKIN MDP-A3U7

19. NEC/TOKIN MDP-A3U7 • Specifications

21. MURATA GYROSTAR ENC-03JA • Example 3: Manufacturer: MURATA Model: GYROSTAR ENC-03JA

22. MURATA GYROSTAR ENC-03JA • Appearance:

23. 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

24. 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-in-AGC circuit

25. 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

26. MURATA GYROSTAR ENC-03JA • Specification

27. MURATA GYROSTAR ENC-03JA • External Dimensions

28. MURATA GYROSTAR ENC-03JA • Terminal Descriptions

29. MURATA GYROSTAR ENC-03JA • Application