Unlock instant, AI-driven research and patent intelligence for your innovation.

A Reciprocal Differential FM CW Interferometric Polarization Maintaining Fiber Optic Gyroscope

A frequency-modulated continuous wave and polarization-maintaining optical fiber technology, which is applied to Sagnac effect gyroscopes, gyroscopes/steering sensing equipment, instruments, etc., can solve problems such as unsatisfactory measurement accuracy, achieve compact structure, and eliminate non-reciprocity Error, the effect of increasing the polarization extinction ratio

Active Publication Date: 2019-05-21
XIAN TECH UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a reciprocal differential frequency modulation continuous wave interference polarization maintaining fiber optic gyroscope to overcome the problem of unsatisfactory measurement accuracy in the prior art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Reciprocal Differential FM CW Interferometric Polarization Maintaining Fiber Optic Gyroscope
  • A Reciprocal Differential FM CW Interferometric Polarization Maintaining Fiber Optic Gyroscope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , the linearly polarized laser light emitted by the single-mode frequency-modulated laser 1 passes through the polarization-maintaining fiber isolator 2, then passes through the first polarization-maintaining fiber collimator 3, and is split by the non-polarizing power beam splitter 6 with equal power, and the split laser is passed through The second polarization-maintaining fiber collimator 4 and the third polarization-maintaining fiber collimator 5 are respectively coupled to the two ends of the single-mode polarization-maintaining fiber ring 7, and the laser emitted from the two ends of the single-mode polarization-maintaining fiber ring 7 is On the non-polarizing power beam splitter 6, the beams are combined and interfered, and the two beat signals formed are separated by the polarizing beam splitter 8, and after passing through the first polarizer 9 and the second polarizer 10 respectively, two photodetectors 11 , 12 receive respectively, wherein, the ...

Embodiment 2

[0032] The reciprocal differential FM continuous wave interference polarization maintaining fiber optic gyroscope can also use two non-polarized power beam splitters with a splitting ratio of 50:50 to further eliminate the non-reciprocity of the splitting and combining optical path of the beat frequency signal, such as figure 2 shown.

[0033] The difference from Example 1 is:

[0034] The first 50:50 splitting ratio non-polarizing power beam splitter 6, the second 50:50 splitting ratio non-polarizing power beam splitting device 13 are consistent with the main plane of the polarization beam splitter 8, the second polarization-maintaining fiber collimator 4 and The direction of the slow axis of the third polarization-maintaining fiber collimator 5 forms an angle of 0° and an angle of 90° (or an angle of 90° and 0°) with the main plane of the second 50:50 splitting ratio non-polarizing power beam splitter 13 respectively . The laser light emitted by the first polarization-mai...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A reciprocal and differential type frequency-modulated continuous wave interferometric polarization-maintaining fiber gyroscope. The functions of beam splitting, beam combination, separation, and detection of polarized light of an optical interference signal are completed by using a combined device consisting of a single-mode frequency modulation laser (1) with a single-mode polarization-maintaining tail fiber, a polarization-maintaining fiber isolator (2), three polarization-maintaining fiber collimators (3, 4, 5), a non-polarized power beam splitter (6) having a splitting ratio of 50:50, a single-mode polarization-maintaining fiber loop (7), a polarization beam splitter (8), two polarizers (9, 10), and two photoelectric detectors (11, 12); one single-mode polarization-maintaining fiber loop (7) with mutually perpendicular polarization principal axes at two ends is used as a dual-unbalanced fiber frequency-modulated continuous wave sagnac interferometer, and the rotational angular velocity is determined by using a phase difference between two beat signals from the fiber loop. The fiber gyroscope can effectively eliminate the nonreciprocal phase error, and improve the measurement precision of the rotational angular velocity.

Description

Technical field: [0001] The invention relates to the technical field of measuring the rotational angular velocity of a carrier relative to an inertial space, in particular to a reciprocal differential frequency-modulated continuous-wave interference polarization-maintaining optical fiber gyroscope. Background technique: [0002] Optical frequency modulation continuous wave interference is derived from radio radar technology. Because it naturally generates a dynamic signal, it makes phase subdivision, judgment of phase shift direction, and calculation of the number of whole cycles very convenient, so the measurement accuracy of optical frequency modulation continuous wave interference And the dynamic range is higher than the traditional optical zero-beat interferometry technology; the optical frequency modulation continuous wave interferometry technology for the measurement of rotational angular velocity can not only solve the problems of traditional fiber optic gyroscopes suc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72
CPCG01C19/721
Inventor 郑刚刘卫国高明陈海滨张雄星王伟郭峰韩立伟王冰罗建华宋平侯智卿
Owner XIAN TECH UNIV