CA2152799A1 - Laser gyro direct dither drive - Google Patents

Laser gyro direct dither drive

Info

Publication number
CA2152799A1
CA2152799A1 CA002152799A CA2152799A CA2152799A1 CA 2152799 A1 CA2152799 A1 CA 2152799A1 CA 002152799 A CA002152799 A CA 002152799A CA 2152799 A CA2152799 A CA 2152799A CA 2152799 A1 CA2152799 A1 CA 2152799A1
Authority
CA
Canada
Prior art keywords
dither
drive
digital
laser gyro
dither drive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002152799A
Other languages
French (fr)
Other versions
CA2152799C (en
Inventor
Keith R. Fritze
Joseph E. Killpatrick
Dale F. Berndt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell Inc
Original Assignee
Keith R. Fritze
Joseph E. Killpatrick
Dale F. Berndt
Honeywell Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US07/805,124 priority Critical patent/US5225889A/en
Priority claimed from US07/805,124 external-priority patent/US5225889A/en
Application filed by Keith R. Fritze, Joseph E. Killpatrick, Dale F. Berndt, Honeywell Inc. filed Critical Keith R. Fritze
Priority to JP6520977A priority patent/JPH08508566A/en
Priority to PCT/US1993/002698 priority patent/WO1994021987A1/en
Priority to CA002152799A priority patent/CA2152799C/en
Publication of CA2152799A1 publication Critical patent/CA2152799A1/en
Application granted granted Critical
Publication of CA2152799C publication Critical patent/CA2152799C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
    • G01C19/58—Turn-sensitive devices without moving masses
    • G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
    • G01C19/66—Ring laser gyrometers
    • G01C19/68—Lock-in prevention
    • G01C19/70—Lock-in prevention by mechanical means

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Gyroscopes (AREA)

Abstract

A direct digital dither drive for a laser gyro dither motor (244B) including a digital microcomputer, (100) which controls the dithering of a laser gyro (10) to prevent lock in of the laser beams. The digital drive senses a dither position and schedules internal A/D conversions using an A/D conversion abritation scheme. The period frequency and location of the minimum and maximum drive an determined using the microcontroller (100). Accurate dither drive is accomplished using a digital analog feedback system which compensates for real time changes in dither pickoff (244A) and dither (244B) drive components.
CA002152799A 1991-12-11 1993-03-22 Laser gyro direct dither drive Expired - Fee Related CA2152799C (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US07/805,124 US5225889A (en) 1991-12-11 1991-12-11 Laser gyro dither drive
JP6520977A JPH08508566A (en) 1993-03-22 1993-03-22 Laser gyro direct dither drive
PCT/US1993/002698 WO1994021987A1 (en) 1991-12-11 1993-03-22 Laser gyro direct dither drive
CA002152799A CA2152799C (en) 1991-12-11 1993-03-22 Laser gyro direct dither drive

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US07/805,124 US5225889A (en) 1991-12-11 1991-12-11 Laser gyro dither drive
PCT/US1993/002698 WO1994021987A1 (en) 1991-12-11 1993-03-22 Laser gyro direct dither drive
CA002152799A CA2152799C (en) 1991-12-11 1993-03-22 Laser gyro direct dither drive

Publications (2)

Publication Number Publication Date
CA2152799A1 true CA2152799A1 (en) 1994-09-29
CA2152799C CA2152799C (en) 2003-08-19

Family

ID=27805847

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002152799A Expired - Fee Related CA2152799C (en) 1991-12-11 1993-03-22 Laser gyro direct dither drive

Country Status (1)

Country Link
CA (1) CA2152799C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9166843B2 (en) 2013-08-14 2015-10-20 Industrial Technology Research Institute Digital pulse width generator and method for generating digital pulse width

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9166843B2 (en) 2013-08-14 2015-10-20 Industrial Technology Research Institute Digital pulse width generator and method for generating digital pulse width

Also Published As

Publication number Publication date
CA2152799C (en) 2003-08-19

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed