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Gyro Velocity Calculation for Interferometric Fiber Optic Gyroscope

A fiber optic gyroscope and interferometric technology, applied in Sagnac effect gyroscopes, gyroscope/steering sensing equipment, navigation, etc., can solve problems such as IFOG performance degradation

Active Publication Date: 2020-12-04
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During operation, events may occur that degrade the performance of the IFOG

Method used

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  • Gyro Velocity Calculation for Interferometric Fiber Optic Gyroscope
  • Gyro Velocity Calculation for Interferometric Fiber Optic Gyroscope
  • Gyro Velocity Calculation for Interferometric Fiber Optic Gyroscope

Examples

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Embodiment Construction

[0011] refer to figure 1 , the interferometric fiber optic gyro system 100 includes an interferometric fiber optic gyroscope (IFOG) 110 . IFOG 110 may include fiber optic sensing coil 112 , beam splitting optics 114 and coupler 116 . The system 100 further includes a fiber optic light source 120 that provides optical input to the IFOG 110 . Beam splitting optics 114 split the optical input into two beams that propagate through sensing coil 112 in opposite directions. Upon returning to the point of entry, the two counter-propagating beams exit the sensing coil 112 and are recombined by the beam splitting optics 114 and undergo interference. When there is rotation about the axis of the sensing coil 112, the relative phases of the two exiting beams, and thus, the positions of their interference fringes, shift according to the angular velocity of the rotation. This is called a Sagnac phase shift. The Sagnac phase shift (φ) can be expressed as where L and D are the length and...

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Abstract

The present disclosure relates to gyro velocity calculations for interferometric fiber optic gyros. A method is provided, comprising supplying an optical input to an interferometric fiber optic gyroscope (IFOG) at a first frequency and then a different second frequency; detecting the response of the IFOG to the optical input at the first frequency and at the second frequency. difference; and calculate the gyro rate from the difference and the correction term.

Description

technical field [0001] The present disclosure relates to methods and systems for gyro rate calculation of interferometric fiber optic gyro. Background technique [0002] During operation of an interferometric fiber optic gyroscope (IFOG), a drift-related error increases over time. In order to correct the relative offset error, the scale factor (scale factor, conversion factor) of the IFOG may be recalibrated. [0003] During operation, events may occur that degrade the performance of the IFOG. For example, the event that dims the IFOG's fiber optic coil. To compensate for this degradation, the scaling factor of the IFOG can be recalibrated. Contents of the invention [0004] According to embodiments herein, there is provided a method comprising: supplying an optical input to an interferometric fiber optic gyroscope (IFOG) at a first frequency and then a different second frequency; the difference in response to the optical input at the two frequencies; and calculating t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/00G01C19/72
CPCG01C19/72G01C21/005G01C25/005G01C19/721G01C25/00
Inventor 肖恩·M·德特洛夫詹姆斯·K·金里奇
Owner THE BOEING CO