CN220398576U - Optical fiber gyroscope based on spectrum split detection - Google Patents
Optical fiber gyroscope based on spectrum split detection Download PDFInfo
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- CN220398576U CN220398576U CN202322054216.3U CN202322054216U CN220398576U CN 220398576 U CN220398576 U CN 220398576U CN 202322054216 U CN202322054216 U CN 202322054216U CN 220398576 U CN220398576 U CN 220398576U
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- 238000001228 spectrum Methods 0.000 title claims abstract description 70
- 239000013307 optical fiber Substances 0.000 title claims abstract description 64
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 230000003595 spectral effect Effects 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
The utility model discloses an optical fiber gyroscope based on spectrum splitting detection, which structurally comprises an optical fiber circulator, wherein a port of the optical fiber circulator is connected with a flat spectrum ASE light source, a b port of the optical fiber circulator is connected with a Y waveguide modulator, and the Y waveguide modulator is connected with an optical fiber ring; the c port of the optical fiber circulator is connected with a spectrum splitting module, and the spectrum splitting module is connected with a signal processing circuit. The utility model can improve the detection precision and the performance of the scale factors.
Description
Technical Field
The utility model relates to an optical fiber gyroscope, in particular to an optical fiber gyroscope based on spectrum splitting detection.
Background
The optical fiber gyroscope is a high-precision inertial instrument for measuring angular rate information, and is widely applied to the fields of aerospace, naval vessel navigation and the like.
The fiber optic gyroscope generally adopts a flat spectrum ASE light source to obtain wider spectrum width, so that better suppression of polarization noise, scattering noise and related intensity noise is realized, but the index of the scale factor stability, symmetry and nonlinearity of the fiber optic gyroscope of the flat spectrum ASE light source is poorer. Compared with a flat spectrum ASE light source, the Gaussian spectrum shape has more stable average wavelength and more symmetrical spectrum shape, which is beneficial to improving the index of the scale factor stability, symmetry and nonlinearity of the optical fiber gyroscope; however, the gaussian spectrum ASE light source has a disadvantage in that the spectrum width is narrow, and the noise suppressing effect is reduced, thereby reducing the detection accuracy of the optical fiber gyroscope. Therefore, there is an urgent need for a method that can solve the contradiction between the precision improvement and the scale factor performance improvement of the optical fiber gyroscope using the ASE light source.
Disclosure of Invention
The utility model aims to provide a fiber optic gyroscope based on spectrum splitting detection. The utility model can improve the detection precision and the performance of the scale factors.
The technical scheme of the utility model is as follows: the optical fiber gyroscope based on spectrum splitting detection comprises an optical fiber circulator, wherein a port of the optical fiber circulator is connected with a flat spectrum ASE light source, a b port of the optical fiber circulator is connected with a Y waveguide modulator, and the Y waveguide modulator is connected with an optical fiber ring; the c port of the optical fiber circulator is connected with a spectrum splitting module, and the spectrum splitting module is connected with a signal processing circuit.
In the optical fiber gyroscope based on spectrum splitting detection, the spectrum splitting module comprises a wavelength division multiplexer connected with a port c of the optical fiber circulator, the wavelength division multiplexer is connected with a first Gaussian spectrum filter and a second Gaussian spectrum filter in parallel, the first Gaussian spectrum filter is connected with a first photoelectric detector, and the second Gaussian spectrum filter is connected with a second photoelectric detector.
In the optical fiber gyroscope based on spectrum splitting detection, the modulation signal output end of the signal processing circuit is connected with the modulation signal input end of the Y waveguide modulator.
In the optical fiber gyroscope based on spectrum splitting detection, the signal processing circuit is provided with the AD sampling unit.
Compared with the prior art, the utility model adopts the wavelength division multiplexer to divide the flat spectrum ASE light wave output by the optical fiber circulator into light waves with two wavelengths, and the two light waves with the Gaussian spectrum ASE symmetrical spectrum formed after passing through the respective Gaussian spectrum filters are incident to the respective photoelectric detectors for demodulating angular rate signals of the gyroscope, and data fusion is carried out on real-time signal values of the demodulation of the two angular rate signals, thereby not only improving the detection precision of the optical fiber gyroscope by ∈2 times, but also improving the scale factor stability, symmetry and nonlinearity index of the optical fiber gyroscope. The utility model effectively fuses the characteristics of the flat spectrum ASE light wave and the Gaussian spectrum ASE light wave together in a spectrum splitting mode (the Gaussian spectrum ASE light wave is beneficial to improving the index of scale factor stability, nonlinearity and asymmetry of the optical fiber gyroscope, and the flat spectrum ASE light wave is beneficial to well suppressing noise and improving precision), thereby not only effectively improving the final detection precision, but also improving the index of scale factor stability, symmetry and nonlinearity of the optical fiber gyroscope. The method solves the problem of contradiction between the precision of the optical fiber gyroscope and the performance improvement of the scale factor under the condition of almost not increasing the cost, and is particularly suitable for the optical fiber gyroscope. In conclusion, the method and the device can improve the precision and the scale factor performance.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
The marks in the drawings are: 2-optical fiber circulator, 1-flat spectrum ASE light source, 3-Y waveguide modulator, 4-optical fiber ring, 5-wavelength division multiplexer, 6-first Gaussian spectrum filter, 7-second Gaussian spectrum filter, 8-first photodetector, 9-second photodetector, 10-signal processing circuit.
Detailed Description
The utility model is further illustrated by the following figures and examples, which are not intended to be limiting.
Examples. The optical fiber gyroscope based on spectrum splitting detection is shown in figure 1, and comprises an optical fiber circulator 2, wherein a port of the optical fiber circulator 2 is connected with a flat spectrum ASE light source 1, a b port of the optical fiber circulator 2 is connected with a Y waveguide modulator 3, and the Y waveguide modulator 3 is connected with an optical fiber ring 4; the c port of the optical fiber circulator 2 is connected with a spectrum splitting module, and the spectrum splitting module is connected with a signal processing circuit 10.
The spectrum splitting module comprises a wavelength division multiplexer 5 connected with a port of the optical fiber circulator 2c, the wavelength division multiplexer 5 is connected with a first Gaussian spectrum filter 6 and a second Gaussian spectrum filter 7 in parallel, the first Gaussian spectrum filter 6 is connected with a first photoelectric detector 8, and the second Gaussian spectrum filter 7 is connected with a second photoelectric detector 9.
The modulation signal output terminal of the signal processing circuit 10 is connected to the modulation signal input terminal of the Y waveguide modulator 3.
The signal processing circuit 10 is provided with an AD sampling unit.
A method for using optical fiber gyroscope based on spectrum split detection includes inputting flat spectrum ASE light wave into optical fiber ring through optical fiber circulator, splitting flat spectrum signal light output by optical fiber circulator into two light waves by wavelength division multiplexer, forming two beams of Gaussian spectrum light wave after passing through respective Gaussian spectrum filter, carrying out photoelectric detection on two beams of Gaussian spectrum light wave respectively, carrying out angular rate signal demodulation of gyroscope through signal processing circuit, carrying out addition and averaging on real-time signal values demodulated by two angular rate signals, taking average value as output, and improving precision of optical fiber gyroscope by ≡2 times.
The b port of the optical fiber circulator 2 is connected to the a port of the Y waveguide modulator 3,
the b-port and the c-port of the Y-waveguide modulator 3 are connected to two ends of the optical fiber ring 4,
the c-port of the optical fiber circulator 2 is connected to the a-port of the wavelength division multiplexer 5,
the b port of the wavelength division multiplexer 5 is connected to the a port of the first gaussian spectral filter 6,
the b port of the wavelength division multiplexer 5 is connected to the a port of the second gaussian spectral filter 7,
the b port of the first gaussian spectral filter is connected to the input of a first photodetector 8,
the b port of the second gaussian spectral filter is connected to the input of a second photodetector 9,
the output of the first photodetector 8 is connected to a signal processing circuit 10,
the output of the second photodetector 9 is connected to a signal processing circuit 10,
the modulation signal output terminal of the signal processing circuit 10 is connected to the modulation signal input terminal of the Y waveguide modulator 3,
the signal processing circuit 10 includes a gyroscope signal output.
The working principle of the utility model is as follows:
the correlation intensity noise amplitude of the fiber optic gyroscope is inversely proportional to the square root of the input light source spectral width, and can be expressed as:
wherein sigma RIN The related intensity noise amplitude, deltav, is the equivalent spectral width of the ASE light source.
In order to achieve the detection precision and the scale factor performance of the optical fiber gyroscope, the flat spectrum signal light output by the optical fiber circulator is split into two light waves through the wavelength division multiplexer, and the two Gaussian spectrum light waves with the central wavelengths of 1530nm and 1560nm are formed through the Gaussian spectrum filters. Through the spectrum splitting method, the characteristics of the flat spectrum ASE light wave and the Gaussian spectrum light wave can be effectively combined together, two photoelectric detectors are adopted to respectively perform photoelectric detection, and a signal processing circuit respectively performs angular rate signal demodulation of the gyroscope, which is basically equivalent to two independent fiber-optic gyroscopes.
The noise type of the output signal of the optical fiber gyroscope is white noise. The two uncorrelated white noise values are summed and averaged, and the mean square value of the summed noise is reduced to ∈2. According to the characteristic of white noise, two independent fiber-optic gyroscope signals are added and averaged, so that the signal amplitude is unchanged, the noise amplitude is reduced to be ∈2, namely the signal-to-noise ratio is improved by ∈2, and finally the precision of the fiber-optic gyroscope is improved by ∈2. The method solves the problem of contradiction between the precision and the scale factor performance improvement of the optical fiber gyroscope under the condition of almost not increasing the cost, and is particularly suitable for the optical fiber gyroscope.
Claims (4)
1. Optical fiber gyroscope based on spectrum split detection, its characterized in that: the optical fiber device comprises an optical fiber circulator (2), wherein a port of the optical fiber circulator (2) is connected with a flat spectrum ASE light source (1), a b port of the optical fiber circulator (2) is connected with a Y waveguide modulator (3), and the Y waveguide modulator (3) is connected with an optical fiber ring (4); the c port of the optical fiber circulator (2) is connected with a spectrum splitting module, and the spectrum splitting module is connected with a signal processing circuit (10).
2. The optical fiber gyroscope based on spectral splitting detection of claim 1, wherein: the spectrum splitting module comprises a wavelength division multiplexer (5) connected with a c port of the optical fiber circulator (2), the wavelength division multiplexer (5) is connected with a first Gaussian spectrum filter (6) and a second Gaussian spectrum filter (7) in parallel, the first Gaussian spectrum filter (6) is connected with a first photoelectric detector (8), and the second Gaussian spectrum filter (7) is connected with a second photoelectric detector (9).
3. The optical fiber gyroscope based on spectral splitting detection of claim 1, wherein: the modulation signal output end of the signal processing circuit (10) is connected with the modulation signal input end of the Y waveguide modulator (3).
4. The optical fiber gyroscope based on spectral splitting detection of claim 1, wherein: an AD sampling unit is arranged on the signal processing circuit (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322054216.3U CN220398576U (en) | 2023-08-02 | 2023-08-02 | Optical fiber gyroscope based on spectrum split detection |
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| CN202322054216.3U CN220398576U (en) | 2023-08-02 | 2023-08-02 | Optical fiber gyroscope based on spectrum split detection |
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| CN202322054216.3U Active CN220398576U (en) | 2023-08-02 | 2023-08-02 | Optical fiber gyroscope based on spectrum split detection |
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- 2023-08-02 CN CN202322054216.3U patent/CN220398576U/en active Active
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