ECE5320 Mechatronics
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ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Fiber Optic Gyro PowerPoint PPT Presentation


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ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Fiber Optic Gyro. Prepared by: Jeff Ferrin Dept. of Electrical and Computer Engineering Utah State University. 3/10/2006. Outline . Reference list To probe further Major applications

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ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Fiber Optic Gyro

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Ece5320 mechatronics assignment01 literature survey on sensors and actuators topic fiber optic gyro

ECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Topic: Fiber Optic Gyro

Prepared by: Jeff Ferrin

Dept. of Electrical and Computer Engineering

Utah State University

3/10/2006


Outline

Outline

  • Reference list

  • To probe further

  • Major applications

  • Basic working principle illustrated

  • A typical sample configuration in application (application notes)

  • Major specifications

  • Limitations

  • And many more relevant issues in applications (such as, how to choose, cost information, where to buy etc.)

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


Reference list

Reference list

  • Northrop Grumman Navigation Systems Division

  • KVH

  • Prentice Hall PTR.

  • Wikimedia Foundation, Inc.

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


To explore further survival pointers of web references etc

To explore further (survival pointers of web references etc)

  • www.kvh.com

  • http://www.nsd.es.northropgrumman.com/Html/FOG_Tech/#

  • http://en.wikipedia.org/wiki/Sagnac_effect

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


Major applications

Major applications

  • Inertial Measurement

    • Navigation

      • Aircraft

      • Spacecraft

      • Used for dead reckoning

    • Stabilization

      • Military turret stabilization

    • Motion Sensing

      • Unmanned Vehicles

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


Applications of fog

Applications of FOG

  • Autonomous Vehicles

    Used for angular position feedback and heading.

Autonomous Solutions Inc.

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


Fiber optic gyroscope

Fiber Optic Gyroscope

  • Fiber optic gyros are making mechanical gyroscopes obsolete

  • The theory behind the fiber optic gyro has been around for decades

  • The accuracy and repeatability are being improved each year

  • The FOGs are becoming smaller and the costs continue to be driven down

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


How does a fog work

How does a FOG work?

www.kvh.com

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


How does a fog work1

How does a FOG work?

  • The theory is based on the Sagnac effect.

    • A beam of light is split and each half travels the same path but in opposite directions.

Northrop Grumman

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


How does a fog work2

How does a FOG work?

  • Light traveling in the direction of rotation

    • This half of the light is “chasing” the end of the coil because the coil is moving away from the light

    • This increases the distance the light has to travel which will also increase the time required to reach the end of the path

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


How does a fog work3

How does a FOG work?

  • Light traveling in the opposite direction of the angular rotation

    • This half of the light is moving towards the end while the end is moving towards the light

    • This results in a shorter distance for the light to travel which will reduce the time.

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


How does a fog work4

How does a FOG work?

  • After completing the path of the fiber-optic cables the waves will be out of phase

  • The angular rate is determined from this phase shift

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


How does a fog work5

How does a FOG work?

  • Output signals for no rotation

  • Phase angle between the two waves is 0

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


How does a fog work6

How does a FOG work?

  • Output signals for an angular rotation

  • Phase angle between the two waves is 0

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


How does a fog work7

How does a FOG work?

  • For any given change in angular velocity the phase of the two light waves will change continuously

  • This change in phase is converted to an angular rate

  • This angular rate can be integrated to obtain the position of the FOG

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


Ece5320 mechatronics assignment01 literature survey on sensors and actuators topic fiber optic gyro

FOG

  • A longer fiber-optic path means that the waves will be further out of phase

    • The resolution of a fiber-optic gyro can be increased by increasing the length of the fiber-optic path

    • With a longer path, even small angular rates will be detected because of the fact that the time for the light waves to get out phase increases

    • Fiber-optic cords up to 5 km (Transducers and Their Elements, Prentice Hall PTR)

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


Advantages

Advantages

  • Faster response than mechanical gyroscopes

  • Rugged and durable

    • No moving parts

  • Accuracy can reach 0.001 deg/hr

  • High tolerance for shock and vibration

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


Advantages1

Advantages

  • Not sensitive to gravity like mechanical gyroscopes

  • High reliability

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


Disadvantages

Disadvantages

  • Larger than mechanical gyros but the size is continually getting smaller

  • A bias drift over time

  • High costs

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


Summary

Summary

  • Fiber optic gyros are replacing the older mechanical gyroscopes

  • The fiber optic gyro is based on the Sagnac effect

  • The performance is rapidly increasing

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


Manufacturers of fogs

Manufacturers of FOGs

  • KVH

    • The leader in the technology of this field

  • Crossbow

ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuators


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