Method and system for detecting optical ring resonator resonance frequencies and free spectral range

A technology of resonators and lasers, applied in instruments, measuring devices, surveying and navigation, etc., can solve the problems of cost, size, weight and power loss increase

Inactive Publication Date: 2014-08-27
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the number of lasers and associated phase-locked loop electronics lead t...

Method used

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  • Method and system for detecting optical ring resonator resonance frequencies and free spectral range
  • Method and system for detecting optical ring resonator resonance frequencies and free spectral range
  • Method and system for detecting optical ring resonator resonance frequencies and free spectral range

Examples

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example 1

[0095]Example 1 includes a resonator fiber optic gyroscope comprising: a gyroscope resonator having a clockwise input port and a counterclockwise input port and a free spectral range (FSR); a first laser configured to couple a clockwise beam to into the clockwise input port; a clockwise Pound-Drever-Hall modulation generator for modulating the clockwise beam with resonant tracking modulation before the clockwise beam is coupled into the clockwise input port; bias correction electronics; Free Spectral Range (FSR) detection and servo electronics including a switch communicatively coupled to a clockwise Pound-Drever-Hall modulation generator; a clockwise transmission detector configured to receive output from a counterclockwise input port and outputs a signal to the bias correction electronics and FSR detection and servo electronics; and a second laser configured to couple a counterclockwise beam into the counterclockwise input port, where the clockwise beam is based on the Pound-...

example 2

[0096] Example 2 includes the resonator fiber optic gyroscope of Example 1, wherein the bias correction electronics is the first bias correction electronics, the FSR detection and servo electronics is the first FSR detection and servo electronics, and the resonance tracking modulation is the first resonant tracking modulation, and the switch is a first switch, the resonator fiber optic gyroscope also includes: a counterclockwise Pound-Drever-Hall modulation generator that tracks the modulation at a second resonant frequency before the counterclockwise beam is coupled into the counterclockwise input port modulated counterclockwise beam; second bias correction electronics; second FSR detection and servo electronics including a second switch communicatively coupled to the counterclockwise Pound-Drever-Hall modulation generator; and counterclockwise transmission detection is arranged to receive the beam output from the clockwise input port and output a signal to the second bias cor...

example 3

[0097] Example 3 includes the resonator fiber optic gyroscope of Example 2, wherein the first bias correction electronics and the second bias correction electronics comprise: an analog-to-digital converter; a first digital mixer receiving an input from the analog-to-digital converter ; a second digital mixer that receives an input from the first digital mixer; an accumulator that receives an input from the second digital mixer and controls the Pound-Drever-Hall loop lock set point, where the bias error is control to zero average value; and a digital-to-analog converter, wherein the output from the digital-to-analog converter in the first bias correction electronics is input to the clockwise Pound-Drever-Hall servo electronics, and wherein the output from the second bias correction electronics The output of the digital-to-analog converter in the set correction electronics is input to the counterclockwise Pound-Drever-Hall servo electronics.

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PUM

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Abstract

A resonator fiber optic gyroscope (RFOG) is provided. The RFOG includes a gyroscope resonator having a clockwise input port and a counter-clockwise input port; a first laser configured to couple a clockwise optical beam into to the clockwise input port; a clockwise Pound-Drever-Hall modulation generator to modulate the clockwise optical beam with a resonance tracking modulation before the clockwise optical beam is coupled into the clockwise input port; bias correction electronics; FSR-detection-and-servo electronics including a switch communicatively coupled to the clockwise Pound-Drever-Hall modulation generator; a clockwise transmission detector configured to receive an optical beam output from the counter-clockwise input port and output signals to the bias correction electronics and the FSR-detection-and-servo electronics; and a second laser configured to couple a counter-clockwise optical beam into to the counter-clockwise input port, wherein the FSR of the gyroscope resonator is measured based on the Pound-Drever-Hall modulation of the clockwise optical beam.

Description

Background technique [0001] Resonator fiber optic gyroscopes (RFOGs) have the potential to meet needs in many segments of the inertial sensing market. To overcome light backscattering errors, currently available RFOGs frequency lock clockwise (CW) and counterclockwise (CCW) lasers to different longitudinal modes of the gyro-sensing resonator. These techniques separate the back-propagating laser frequency and up-convert the backscatter error well above the rotational measurement band. However, if only two lasers are used, the free spectral range (FSR) of the gyro-sensing resonator becomes part of the rotation measurement. Therefore, the free spectral range of the gyro-sensing resonator must be measured with high precision to reduce adverse effects on rotation sensing. [0002] To accurately measure FSR, currently available RFOGs use a third laser frequency to detect the sensing resonator. Because one laser is the master and the other two are slaves, it is difficult to modula...

Claims

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Application Information

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IPC IPC(8): G01C19/72G01C25/00
CPCG01C19/721G01C19/727
Inventor L.K.斯特兰乔尔德M.K.萨利特邱铁群G.A.桑德斯
Owner HONEYWELL INT INC
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