CN111089605A - Detection device and method for resonant optical gyroscope - Google Patents
Detection device and method for resonant optical gyroscope Download PDFInfo
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- CN111089605A CN111089605A CN201911285949.XA CN201911285949A CN111089605A CN 111089605 A CN111089605 A CN 111089605A CN 201911285949 A CN201911285949 A CN 201911285949A CN 111089605 A CN111089605 A CN 111089605A
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
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Abstract
The invention discloses a detection device and a method for a resonant optical gyroscope, wherein the detection device comprises: the tunable narrow linewidth laser comprises a tunable narrow linewidth laser, an optical beam splitter, an optical ring-shaped resonant cavity, a first photoelectric converter, a second photoelectric converter, a signal demodulation module, a signal modulation module, a first optical coupler and a second optical coupler; the tunable narrow linewidth laser is connected with the optical beam splitter; the optical beam splitter is respectively connected with the first optical coupler and the second optical coupler in a coupling way; the first optical coupler is further connected with the first photoelectric converter, and the second optical coupler is further connected with the second photoelectric converter; the first optical coupler and the second optical coupler are respectively connected with the optical ring-shaped resonant cavity; the first photoelectric converter is connected with the signal demodulation module and the signal modulation module; the second photoelectric converter is connected with the signal demodulation module. The detection device and the detection method of the resonant optical gyroscope have the advantages of simple structure, low cost and the like.
Description
Technical Field
The invention belongs to the technical field of signal detection, and particularly relates to a detection device and a detection method for a resonant optical gyroscope.
Background
A Resonant Optical Gyroscope (ROG) is an inertial sensor for detecting rotation by using Sagnac effect, which is enhanced by an optical ring Resonator, and has great advantages in miniaturization, integration and low cost compared with a conventional Interferometric Fiber Optic Gyroscope (IFOG).
The Sagnac effect in the ROG is very weak in signal, and there are many optical noises such as shot noise, rayleigh backscattering, optical kerr effect, polarization fluctuation, faraday effect, and temperature fluctuation in the ROG. Generally, to reduce the influence of various noises on the gyro precision, Clockwise (CW) and Counterclockwise (CCW) optical waves in the ROG need to be modulated and demodulated, which greatly increases the complexity and cost of an optical path system, and a very complex circuit is also needed for the demodulation of signals, so that the cost and system complexity of the ROG are greatly increased.
Disclosure of Invention
The technical problem of the invention is solved: the device and the method for detecting the resonant optical gyroscope have the advantages of simple structure, low cost and the like.
In order to solve the above technical problem, the present invention discloses a detection device for a resonant optical gyroscope, comprising: the tunable narrow linewidth laser comprises a tunable narrow linewidth laser, an optical beam splitter, an optical ring-shaped resonant cavity, a first photoelectric converter, a second photoelectric converter, a signal demodulation module, a signal modulation module, a first optical coupler and a second optical coupler;
the tunable narrow linewidth laser is connected with the optical beam splitter;
two output ends of the optical beam splitter are respectively connected with one input end of the first optical coupler and one input end of the second optical coupler;
the other input end of the first optical coupler is connected with one end of the first photoelectric converter, and the other input end of the second optical coupler is connected with one end of the second photoelectric converter;
the output end of the first optical coupler and the output end of the second optical coupler are respectively connected with the first port and the second port of the optical ring resonator;
the other end of the first photoelectric converter is respectively connected with the signal demodulation module and the signal modulation module;
the other end of the second photoelectric converter is connected with the signal demodulation module.
In the detection device for a resonance type optical gyro described above,
the signal modulation module is used for generating and outputting a modulation signal;
the tunable narrow linewidth laser is used for receiving the modulation signal, modulating the wavelength of output light according to the modulation signal and outputting modulated light;
the optical beam splitter is used for receiving the modulated light, splitting the modulated light and outputting a first light beam and a second light beam;
a first optical coupler for receiving the first optical beam and coupling the first optical beam into the first port of the optical ring resonator; and coupling a second optical signal output by the first port of the optical resonant cavity to the first photoelectric converter;
a second optical coupler for receiving the second optical beam and coupling the second optical beam into the second port of the optical ring resonator; and coupling the first optical signal output by the second port of the optical resonator to the second optical-to-electrical converter;
the optical ring-shaped resonant cavity is used for respectively resonating the first light beam and the second light beam input from the first port and the second port, and outputting a first optical signal and a second optical signal obtained after resonance from the second port and the first port;
the first photoelectric converter is used for converting a second optical signal output by the first port of the optical resonant cavity into a second electric signal and outputting the second electric signal;
the second photoelectric converter is used for converting the first optical signal output by the second port of the optical resonant cavity into a first electric signal and outputting the first electric signal;
the signal demodulation module is used for carrying out filtering and distortion amplification processing on the first electric signal and the second electric signal, and amplifying the resonance waveform into square waves to obtain a first square wave signal and a second square wave signal; and demodulating the first square wave signal and the second square wave signal to obtain an optical gyro signal and outputting the optical gyro signal.
The detection device for a resonance type optical gyro further includes: a data recorder;
and the data recorder is connected with the signal demodulation module and used for receiving and recording the gyro signal output by the signal demodulation module.
In the detection apparatus for a resonant optical gyro, the signal demodulation module, when demodulating the optical gyro signal, includes:
determining the time difference of the falling edge or the rising edge of the first square wave signal and the second square wave signal by monitoring the falling edge or the rising edge of the first square wave signal and the second square wave signal in the clockwise direction;
and demodulating according to the time difference of the falling edge or the rising edge of the first square wave signal and the second square wave signal to obtain the optical gyro signal.
In the detection device for the resonance type optical gyro, the waveform of the modulation signal is a triangular wave or a sawtooth wave.
In the detection device of the resonant optical gyroscope, the modulated light meets the requirement that the output wavelength periodically changes along with time and the wavelength range is one FSR covering the optical ring-shaped resonant cavity.
In the detection device of the resonant optical gyro, the first light beam and the second light beam have equal power.
In the detection device of the resonant optical gyroscope, the first optical signal and the second optical signal carry rotation information.
Correspondingly, the invention also discloses a detection method of the resonant optical gyroscope, which comprises the following steps:
the tunable narrow linewidth laser modulates the wavelength of output light according to the modulation signal output by the signal modulation module and outputs modulated light;
splitting the modulated light by an optical beam splitter to output a first light beam and a second light beam;
coupling the first optical beam into a first port of the optical ring resonator through a first optical coupler and the second optical beam into a second port of the optical ring resonator through a second optical coupler;
the first light beam and the second light beam are resonated through the optical ring-shaped resonant cavity, and a first optical signal and a second optical signal obtained after the resonance are respectively output from a second port and a first port of the optical ring-shaped resonant cavity;
coupling a second optical signal output by the first port of the optical resonator to the first optical-to-electrical converter through the first optical coupler and coupling a first optical signal output by the second port of the optical resonator to the second optical-to-electrical converter through the second optical coupler;
converting the second optical signal into a second electrical signal by the first photoelectric converter, and converting the first optical signal into a first electrical signal by the second photoelectric converter;
filtering and distortion amplifying processing is carried out on the first electric signal and the second electric signal through a signal demodulation module, and the resonance waveform is amplified into square waves to obtain a first square wave signal and a second square wave signal;
and demodulating the first square wave signal and the second square wave signal through a signal demodulation module to obtain an optical gyro signal and output the optical gyro signal.
The invention has the following advantages:
(1) the invention discloses a detection scheme of a resonant optical gyroscope, which only needs to modulate the wavelength of output light of a light source, does not need to modulate light in other light paths, does not need a phase modulator, ensures that a light path system has simple structure and low implementation cost, provides a basis for implementing the low-cost resonant optical gyroscope,
(2) the invention discloses a detection scheme of a resonant optical gyroscope, which does not need to accurately lock the resonant wavelength of an optical ring resonator and does not need to perform phase modulation on light in a light path, thereby simplifying the circuit structure and reducing the circuit cost.
Drawings
FIG. 1 is a schematic circuit diagram of a detection apparatus of a resonant optical gyroscope according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an electrical signal output by an optoelectronic converter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an electrical signal output by an optical-to-electrical converter after distortion amplification according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, in the present embodiment, the detection device for a resonant optical gyro includes: the tunable narrow linewidth laser comprises a tunable narrow linewidth laser 1, an optical beam splitter 2, an optical ring resonator 3, a first photoelectric converter 4, a second photoelectric converter 5, a signal demodulation module 6, a signal modulation module 7, a first optical coupler 9 and a second optical coupler 10.
The connections are as follows: the tunable narrow linewidth laser 1 is connected with the optical beam splitter 2; two output ends of the optical beam splitter 2 are respectively connected with one input end of the first optical coupler 9 and one input end of the second optical coupler 10; the other input end of the first optical coupler 9 is connected with one end of the first photoelectric converter 4, and the other input end of the second optical coupler 10 is connected with one end of the second photoelectric converter 5; the output end of the first optical coupler 9 and the output end of the second optical coupler 10 are respectively connected with the first port and the second port of the optical ring resonator 3; the other end of the first photoelectric converter 4 is respectively connected with the signal demodulation module 6 and the signal modulation module 7; the other end of the second photoelectric converter 5 is connected to the signal demodulation module 6.
In this embodiment, the specific operation flow of each component under the detection device of the resonant optical gyroscope is as follows:
and the signal modulation module 7 is used for generating a modulation signal and outputting the modulation signal.
The tunable narrow linewidth laser 1 is configured to receive a modulation signal, modulate a wavelength of output light according to the modulation signal, and output modulated light.
And the optical beam splitter 2 is used for receiving the modulated light, splitting the modulated light and outputting a first light beam and a second light beam.
A first optical coupler 9 for receiving the first optical beam and coupling the first optical beam into the first port of the optical ring resonator 3; and coupling the second optical signal output by the first port of the optical cavity 3 to the first optical-to-electrical converter 4.
A second optical coupler 10 for receiving the second optical beam and coupling the second optical beam into a second port of the optical ring resonator 3; and coupling the first optical signal output by the second port of the optical cavity 3 to the second optical-to-electrical converter 5.
And the optical ring resonant cavity 3 is used for resonating the first light beam and the second light beam input from the first port and the second port respectively, and outputting a first optical signal and a second optical signal obtained after resonance from the second port and the first port respectively.
And the first photoelectric converter 4 is configured to convert the second optical signal output from the first port of the optical resonant cavity 3 into a second electrical signal, and output the second electrical signal.
And the second photoelectric converter 5 is configured to convert the first optical signal output from the second port of the optical resonant cavity 3 into a first electrical signal, and output the first electrical signal.
The signal demodulation module 6 is used for filtering and distortion amplification processing of the first electric signal and the second electric signal, and amplifying the resonance waveform into a square wave to obtain a first square wave signal and a second square wave signal; and demodulating the first square wave signal and the second square wave signal to obtain an optical gyro signal and outputting the optical gyro signal.
It should be noted that, light with periodically changing wavelength is input into the optical ring resonator through the optical beam splitter to form two clockwise and counterclockwise resonant light beams, which enter the photoelectric converter respectively and are converted into electrical signals (as shown in fig. 2), and the two electrical signals are filtered, distorted and amplified to amplify the resonant waveform into a square wave (as shown in fig. 3).
In a preferred embodiment of the present invention, the detection device of the resonant optical gyroscope may further include: a data recorder 8. The data recorder 8 is connected with the signal demodulation module 6, and is used for receiving and recording the gyro signal output by the signal demodulation module 6.
In a preferred embodiment of the present invention, when demodulating the optical gyro signal, the signal demodulation module 6 may specifically include: determining the time difference of the falling edge or the rising edge of the first square wave signal and the second square wave signal by monitoring the falling edge or the rising edge of the first square wave signal and the second square wave signal in the clockwise direction; and demodulating according to the time difference of the falling edge or the rising edge of the first square wave signal and the second square wave signal to obtain the optical gyro signal.
Preferably, the waveform of the modulation signal is a triangular wave or a sawtooth wave.
Preferably, the modulated light satisfies the requirement that the output wavelength varies periodically with time and the wavelength range is one FSR that covers the optical ring resonator.
Preferably, the first and second beams are of equal power. The first optical signal and the second optical signal carry rotation information.
Example 2
On the basis of the above embodiment, the present invention also discloses a detection method for a resonant optical gyroscope, which includes: the tunable narrow linewidth laser 1 modulates the wavelength of output light according to the modulation signal output by the signal modulation module 7, and outputs modulated light; splitting the modulated light by an optical beam splitter 2 to output a first light beam and a second light beam; coupling the first optical beam into a first port of the optical ring cavity 3 by means of a first optical coupler 9 and the second optical beam into a second port of the optical ring cavity 3 by means of a second optical coupler 10; the first light beam and the second light beam are resonated through the optical ring resonant cavity 3, and a first optical signal and a second optical signal obtained after the resonance are respectively output from a second port and a first port of the optical ring resonant cavity 3; coupling the second optical signal output by the first port of the optical resonator 3 to the first optical-to-electrical converter 4 via the first optical coupler 9, and coupling the first optical signal output by the second port of the optical resonator 3 to the second optical-to-electrical converter 5 via the second optical coupler 10; converting the second optical signal into a second electrical signal by the first photoelectric converter 4, and converting the first optical signal into a first electrical signal by the second photoelectric converter 5; filtering and distortion amplifying processing is carried out on the first electric signal and the second electric signal through a signal demodulation module 6, and the resonance waveform is amplified into square waves to obtain a first square wave signal and a second square wave signal; the first square wave signal and the second square wave signal are demodulated by the signal demodulation module 6 to obtain and output an optical gyro signal.
For the method embodiment, since it corresponds to the apparatus embodiment, the description is relatively simple, and for the relevant points, refer to the description of the apparatus embodiment section.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (9)
1. A detection device for a resonant optical gyro is characterized by comprising: the tunable narrow linewidth laser comprises a tunable narrow linewidth laser (1), an optical beam splitter (2), an optical ring-shaped resonant cavity (3), a first photoelectric converter (4), a second photoelectric converter (5), a signal demodulation module (6), a signal modulation module (7), a first optical coupler (9) and a second optical coupler (10);
the tunable narrow linewidth laser (1) is connected with the optical beam splitter (2);
two output ends of the optical beam splitter (2) are respectively connected with one input end of the first optical coupler (9) and one input end of the second optical coupler (10);
the other input end of the first optical coupler (9) is connected with one end of the first photoelectric converter (4), and the other input end of the second optical coupler (10) is connected with one end of the second photoelectric converter (5);
the output end of the first optical coupler (9) and the output end of the second optical coupler (10) are respectively connected with a first port and a second port of the optical ring-shaped resonant cavity (3);
the other end of the first photoelectric converter (4) is respectively connected with the signal demodulation module (6) and the signal modulation module (7);
the other end of the second photoelectric converter (5) is connected with the signal demodulation module (6).
2. The detecting device for a resonant optical gyro according to claim 1,
the signal modulation module (7) is used for generating a modulation signal and outputting the modulation signal;
the tunable narrow linewidth laser (1) is used for receiving a modulation signal, modulating the wavelength of output light according to the modulation signal and outputting modulated light;
the optical beam splitter (2) is used for receiving the modulated light, splitting the modulated light and outputting a first light beam and a second light beam;
a first optical coupler (9) for receiving the first optical beam and coupling the first optical beam into a first port of the optical ring resonator (3); and coupling a second optical signal output by the first port of the optical resonator (3) to the first opto-electric converter (4);
a second optical coupler (10) for receiving the second optical beam and coupling the second optical beam into a second port of the optical ring resonator (3); and coupling the first optical signal output by the second port of the optical resonator (3) to the second opto-electric converter (5);
the optical ring-shaped resonant cavity (3) is used for respectively resonating the first light beam and the second light beam input from the first port and the second port, and outputting a first optical signal and a second optical signal obtained after resonance from the second port and the first port;
the first photoelectric converter (4) is used for converting a second optical signal output by the first port of the optical resonant cavity (3) into a second electric signal and outputting the second electric signal;
the second photoelectric converter (5) is used for converting the first optical signal output by the second port of the optical resonant cavity (3) into a first electric signal and outputting the first electric signal;
the signal demodulation module (6) is used for carrying out filtering and distortion amplification processing on the first electric signal and the second electric signal, and amplifying the resonance waveform into a square wave to obtain a first square wave signal and a second square wave signal; and demodulating the first square wave signal and the second square wave signal to obtain an optical gyro signal and outputting the optical gyro signal.
3. The apparatus for detecting a resonant optical gyro according to claim 1, further comprising: a data recorder (8);
and the data recorder (8) is connected with the signal demodulation module (6) and is used for receiving and recording the gyro signal output by the signal demodulation module (6).
4. The detection apparatus for the resonant optical gyroscope according to claim 2, wherein the signal demodulation module (6), when demodulating the optical gyroscope signal, comprises:
determining the time difference of the falling edge or the rising edge of the first square wave signal and the second square wave signal by monitoring the falling edge or the rising edge of the first square wave signal and the second square wave signal in the clockwise direction;
and demodulating according to the time difference of the falling edge or the rising edge of the first square wave signal and the second square wave signal to obtain the optical gyro signal.
5. The apparatus for detecting a resonant optical gyroscope of claim 2, wherein the waveform of the modulation signal is a triangular wave or a sawtooth wave.
6. A detection apparatus for a resonator optical gyroscope according to claim 2, characterized in that the modulated light satisfies the requirement that the output wavelength varies periodically with time and the wavelength range is one FSR covering the optical ring resonator (3).
7. The apparatus of claim 2, wherein the first and second light beams have equal power.
8. The apparatus of claim 2, wherein the first optical signal and the second optical signal carry rotation information.
9. A detection method of a resonant optical gyroscope is characterized by comprising the following steps:
the tunable narrow linewidth laser (1) modulates the wavelength of output light according to the modulation signal output by the signal modulation module (7) and outputs modulated light;
splitting the modulated light by an optical beam splitter (2) to output a first light beam and a second light beam;
coupling the first optical beam into a first port of the optical ring resonator (3) by means of a first optical coupler (9), and coupling the second optical beam into a second port of the optical ring resonator (3) by means of a second optical coupler (10);
the first light beam and the second light beam are resonated through the optical ring-shaped resonant cavity (3), and a first optical signal and a second optical signal obtained after the resonation are respectively output from a second port and a first port of the optical ring-shaped resonant cavity (3);
coupling the second optical signal output by the first port of the optical resonator (3) to the first opto-electric converter (4) by means of a first optical coupler (9), and coupling the first optical signal output by the second port of the optical resonator (3) to the second opto-electric converter (5) by means of a second optical coupler (10);
converting the second optical signal into a second electrical signal by a first photoelectric converter (4), and converting the first optical signal into a first electrical signal by a second photoelectric converter (5);
filtering and distortion amplification processing is carried out on the first electric signal and the second electric signal through a signal demodulation module (6), and the resonance waveform is amplified into square waves to obtain a first square wave signal and a second square wave signal;
and demodulating the first square wave signal and the second square wave signal through a signal demodulation module (6) to obtain an optical gyro signal and output the optical gyro signal.
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Cited By (1)
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| CN113310480A (en) * | 2021-05-19 | 2021-08-27 | 北京航空航天大学 | Optical gyroscope system based on silicon nitride waveguide resonant cavity |
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