CN116086423A - Large dynamic range resonant fiber optic gyroscope - Google Patents
Large dynamic range resonant fiber optic gyroscope Download PDFInfo
- Publication number
- CN116086423A CN116086423A CN202211561641.5A CN202211561641A CN116086423A CN 116086423 A CN116086423 A CN 116086423A CN 202211561641 A CN202211561641 A CN 202211561641A CN 116086423 A CN116086423 A CN 116086423A
- Authority
- CN
- China
- Prior art keywords
- signal
- voltage signal
- output
- voltage
- triangular wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Gyroscopes (AREA)
Abstract
The invention discloses a large dynamic range resonant fiber optic gyroscope, which belongs to the technical field of optical sensing, solves the problems that the current optical gyroscope has small dynamic range and is not adjustable, and is difficult to meet the requirements of places with large rotating speed change range, and can distinguish rotating speed directions by carrying out phase modulation on light.
Description
Technical Field
The invention relates to the technical field of optical sensing, in particular to a large dynamic range resonant fiber optic gyroscope.
Background
In 1976, v.vali and r.w.shortill of the university of Utah in the united states successfully developed the first fiber optic gyroscope, which has the advantages of no moving parts, no preheating time, insensitive acceleration, digital output, small volume, low cost, etc., besides, the fiber optic gyroscope also overcomes the fatal disadvantages of blocking phenomenon in the laser gyroscope, etc., so that the fiber optic gyroscope has attracted attention of many universities and scientific research institutions internationally as soon as it is developed, and has been developed rapidly.
The existing resonant fiber-optic gyroscope adopts a fiber-optic resonant cavity made of a single-mode fiber, and when the gyroscope rotates, the resonant frequency of the fiber-optic resonant cavity changes along with the rotation angular velocity, so that the rotation angular velocity can be measured by detecting the change of the resonant frequency of the fiber-optic resonant cavity. However, the current resonant fiber-optic gyroscope has a small dynamic range and a fixed dynamic range, and is difficult to meet the requirements of places with large rotating speed variation ranges; on the other hand, the existing resonant fiber-optic gyroscope comprises a phase modulation device, and the rotation speed direction can be distinguished by modulating light through loading a voltage signal on the phase modulation device.
Disclosure of Invention
Based on the defects, the invention provides the resonant fiber-optic gyroscope with a large dynamic range, which solves the problems that the prior resonant fiber-optic gyroscope has a small dynamic range and a fixed dynamic range, is difficult to meet the requirements of places with large rotating speed variation ranges, and can distinguish the rotating speed direction only by carrying out phase modulation on light.
The purpose of the invention is realized in the following way: a large dynamic range resonance type fiber optic gyroscope comprises a first voltage signal source, a laser, a polarization controller, a fiber optic coupler, a fiber optic ring, a piezoelectric ceramic tube, a second voltage signal source, a detector and a signal processing and controlling system; the first signal output end of the first voltage signal source is connected with the modulation signal input end of the laser, the second signal output end of the first voltage signal source is connected with the first signal input end of the signal processing and controlling system, the light output end of the laser is connected with the light input end of the polarization controller, the light output end of the polarization controller is connected with the first light input end of the optical fiber coupler, the optical fiber ring is respectively connected with the second light input end and the second light output end of the optical fiber coupler, the optical fiber ring is wound and fixed on the outer surface of the piezoelectric ceramic tube, the optical fiber coupler is a 2X 2 optical fiber coupler, the signal output end of the second voltage signal source is connected with the signal input end of the piezoelectric ceramic tube, the signal input end of the second voltage signal source is connected with the first signal output end of the signal processing and controlling system, the first light output end of the optical fiber coupler is connected with the light input end of the detector, and the signal output end of the detector is connected with the second signal input end of the signal processing and controlling system, and the signal output end of the second signal processing and controlling system is connected with the second signal input end of the signal processing and the gyroscope;
the optical fiber coupler and the optical fiber ring form an optical fiber resonant cavity; the laser outputs continuous narrow linewidth laser with constant intensity and tunable frequency, the linewidth of the laser is smaller than that of a transmission trough of the optical fiber resonant cavity, the frequency of the laser corresponds to the voltage of a modulation signal input end of the laser, the larger the voltage is, the larger the laser frequency is, and the smaller the voltage is, the smaller the laser frequency is; the first signal output end and the second signal output end of the first voltage signal source output the same periodic triangular wave voltage signal, the maximum voltage value of the periodic triangular wave voltage signal is U2, the minimum voltage value of the periodic triangular wave voltage signal is U1, and the periodic triangular wave voltage signal is loaded to the modulation signal input end of the laser, so that the frequency tuning range of laser output by the laser is equal to the free spectrum width when the optical fiber resonant cavity is stationary;
the change of the outer diameter of the piezoelectric ceramic tube corresponds to the voltage of the signal input end of the piezoelectric ceramic tube, the smaller the voltage is, the larger the outer diameter of the piezoelectric ceramic tube is, and the larger the voltage is, the smaller the outer diameter of the piezoelectric ceramic tube is;
the signal output end of the second voltage signal source outputs a direct-current voltage signal, and the direct-current voltage signal is loaded to the signal input end of the piezoelectric ceramic tube to control the outer diameter of the piezoelectric ceramic tube;
when the fiber optic gyroscope works, the signal processing and control system outputs a control signal to be sent into the second voltage signal source, so that the voltage value output by the second voltage signal source is 0; then, the first voltage signal source outputs a triangular wave voltage signal with the period of T to a signal processing and controlling system, the triangular wave voltage signal is loaded to a modulation signal input end of a laser, meanwhile, a transmission spectrum of an optical fiber resonant cavity with the period of T is detected by a detector, and a transmission spectrum signal output by the detector enters the signal processing and controlling system; then, the signal processing and control system acquires a triangular wave voltage signal and a transmission spectrum signal, if no transmission valley exists in the transmission spectrum signal, the signal processing and control system outputs a control signal and sends the control signal to a second voltage signal source, so that the voltage value of a direct current voltage signal output by the second voltage signal source is gradually increased, the outer diameter of the piezoelectric ceramic tube is gradually reduced, and the radius of the optical fiber ring is gradually reduced until the transmission valley exists in the transmission spectrum signal; then, the signal processing and controlling system compares the triangular wave voltage signal and the transmission spectrum signal on the same time axis, intercepts the same period of the triangular wave voltage signal and the transmission spectrum signal, takes the moment corresponding to the voltage minimum U1 of the triangular wave voltage signal as the time origin, reads the moment t1 corresponding to the minimum transmissivity of the transmission valley in the transmission spectrum signal, if the moment t1 is larger than the moment t0, the rotation speed direction is clockwise, if the moment t1 is smaller than the moment t0, the rotation speed direction is anticlockwise, and the rotation speed is obtained by the absolute value of the difference between the moment t1 and the moment t0; the time T0 is a time origin corresponding to a time corresponding to a voltage minimum U1 of the triangular wave voltage signal with a period T output by the first voltage signal source under the static condition, the signal processing and control system compares the triangular wave voltage signal with the transmission spectrum signal on the same time axis, intercepts the same period of the triangular wave voltage signal and the transmission spectrum signal, and reads a time corresponding to a minimum transmittance of a transmission valley in the transmission spectrum signal by taking the time corresponding to the voltage minimum U1 of the triangular wave voltage signal as the time origin; finally, the signal processing and control system outputs a gyro output signal, wherein the gyro output signal comprises the rotation speed and the rotation direction.
Further, the signal processing and controlling system comprises a sampling filter circuit and a comparison output circuit; the first signal input end of the sampling filter circuit is the first signal input end of the signal processing and controlling system, the second signal input end of the sampling filter circuit is the second signal input end of the signal processing and controlling system, the first signal output end of the comparison output circuit is the first signal output end of the signal processing and controlling system, and the second signal output end of the comparison output circuit is the second signal output end of the signal processing and controlling system; the second signal output end of the first voltage signal source is connected with the first signal input end of the sampling filter circuit, the signal output end of the detector is connected with the second signal input end of the sampling filter circuit, the first signal output end of the sampling filter circuit is connected with the first signal input end of the comparison output circuit, the second signal output end of the sampling filter circuit is connected with the second signal input end of the comparison output circuit, the first signal output end of the comparison output circuit is connected with the signal input end of the second voltage signal source, and the second signal output end of the comparison output circuit outputs a gyro output signal.
Furthermore, when the fiber optic gyroscope works, the comparison output circuit outputs a control signal 1 to be sent into a second voltage signal source, so that the voltage value output by the second voltage signal source is 0; then, the sampling filter circuit samples the triangular wave voltage signal with the period of T output by the first voltage signal source and sends the triangular wave voltage signal into the contrast output circuit, and meanwhile, the sampling filter circuit samples the transmission spectrum signal with the period of T output by the detector, filters the transmission spectrum signal and sends the transmission spectrum signal into the contrast output circuit; after the contrast output circuit obtains the triangular wave voltage signal and the transmission spectrum signal, if no transmission valley exists in the transmission spectrum signal, the contrast output circuit outputs a control signal 2 to be sent into a second voltage signal source, so that the voltage value of a direct current voltage signal output by the second voltage signal source is gradually increased, the outer diameter of the piezoelectric ceramic tube is gradually reduced, and the radius of the optical fiber ring is gradually reduced until the transmission valley exists in the transmission spectrum signal; then, the contrast output circuit compares the triangular wave voltage signal and the transmission spectrum signal on the same time axis, intercepts the same period of the triangular wave voltage signal and the transmission spectrum signal, takes the moment corresponding to the voltage minimum U1 of the triangular wave voltage signal as the time origin, reads the moment t1 corresponding to the minimum transmittance of the transmission trough in the transmission spectrum signal, if the moment t1 is larger than the moment t0, the rotation speed direction is clockwise, if the moment t1 is smaller than the moment t0, the rotation speed direction is anticlockwise, and the rotation speed is obtained by the absolute value of the difference between the moment t1 and the moment t0; finally, the comparison output circuit outputs a gyro output signal, wherein the gyro output signal comprises the rotation speed and the rotation direction.
Furthermore, before the fiber optic gyroscope is used, the method of 'zeroing' and 'zeroing' under the static condition is needed as follows, wherein the comparison output circuit outputs a control signal 1 to be sent into a second voltage signal source so that the voltage value output by the second voltage signal source is 0; then, the sampling filter circuit samples the triangular wave voltage signal with the period of T output by the first voltage signal source and sends the triangular wave voltage signal into the contrast output circuit, and meanwhile, the sampling filter circuit samples the transmission spectrum signal with the period of T output by the detector, filters the transmission spectrum signal and sends the transmission spectrum signal into the contrast output circuit; after the comparison output circuit obtains the triangular wave voltage signal and the transmission spectrum signal, the triangular wave voltage signal and the transmission spectrum signal are compared on the same time axis, the same period of the triangular wave voltage signal and the transmission spectrum signal is intercepted, the time corresponding to the voltage minimum U1 of the triangular wave voltage signal is taken as the time origin, and the time t0 corresponding to the minimum transmittance of the transmission trough in the transmission spectrum signal is read.
The invention has the beneficial effects and advantages that: the invention utilizes a piezoelectric ceramic tube to control the cavity length of the optical fiber resonant cavity, thereby obtaining a large dynamic range, and simultaneously utilizes a narrow linewidth laser to output continuous, constant-intensity and frequency-tunable narrow linewidth laser, so as to obtain the transmission spectrum of the optical fiber resonant cavity, and then can simultaneously obtain the rotation speed and direction by accurately positioning the resonant frequency; the invention has the advantages of large dynamic range, large measuring rotation rate range, no phase modulation device and capability of distinguishing the rotation speed direction without carrying out phase modulation on light.
Drawings
Figure 1 is a schematic view of the overall structure of the present invention,
figure 2 is a voltage waveform diagram of a periodic triangular wave voltage signal output by the first voltage signal source of figure 1,
figure 3 is a schematic view of the optical fiber ring 5 of figure 1 wrapped around and secured to the outer surface of a piezoceramic tube,
fig. 4 is a schematic circuit diagram of the signal processing and control system in fig. 1.
Detailed Description
The invention is further illustrated by the following examples according to the drawings of the specification:
example 1
As shown in fig. 1, a large dynamic range resonant fiber optic gyroscope comprises a first voltage signal source 1, a laser 2, a polarization controller 3, a fiber coupler 4, a fiber optic ring 5, a piezoelectric ceramic tube 6, a second voltage signal source 7, a detector 8 and a signal processing and control system 9; the first signal output end of the first voltage signal source 1 is connected with the modulation signal input end of the laser 2, the second signal output end of the first voltage signal source 1 is connected with the first signal input end of the signal processing and control system 9, the light output end of the laser 2 is connected with the light input end of the polarization controller 3, the light output end of the polarization controller 3 is connected with the first light input end of the optical fiber coupler 4, the optical fiber ring 5 is connected with the second light input end and the second light output end of the optical fiber coupler 4, the optical fiber ring 5 is wound and fixed on the outer surface of the piezoelectric ceramic tube 6, the signal output end of the second voltage signal source 7 is connected with the signal input end of the piezoelectric ceramic tube 6, the signal input end of the second voltage signal source 7 is connected with the first signal output end of the signal processing and control system 9, the first light output end of the optical fiber coupler 4 is connected with the light input end of the detector 8, the signal output end of the detector 8 is connected with the second signal input end of the signal processing and control system 9, and the second signal output end of the signal processing and control system 9 outputs a gyro output signal;
the optical fiber coupler 4 and the optical fiber ring 5 form an optical fiber resonant cavity; the laser 2 outputs continuous, constant-intensity and tunable-frequency narrow linewidth laser, the linewidth of the laser is smaller than that of a transmission valley of the optical fiber resonant cavity, the laser frequency is determined by the voltage of a modulation signal input end of the laser 2, the larger the voltage is, the smaller the laser frequency is, and the relation between the voltage of the modulation signal input end of the laser 2 and the laser frequency output by the laser 2 is known;
the first signal output end and the second signal output end of the first voltage signal source 1 output the same periodic triangular wave voltage signal, the waveform diagram of the periodic triangular wave voltage signal is shown in fig. 2, the maximum voltage value is U2, the minimum voltage value is U1, the periodic triangular wave voltage signal is loaded to the modulation signal input end of the laser 2, so that the frequency tuning range of the laser output by the laser 2 is equal to the free spectrum width when the optical fiber resonant cavity is static;
the outer diameter of the piezoelectric ceramic tube 6 is determined by the voltage of the signal input end of the piezoelectric ceramic tube 6, the smaller the voltage is, the larger the outer diameter of the piezoelectric ceramic tube 6 is, the larger the voltage is, the smaller the outer diameter of the piezoelectric ceramic tube 6 is, and the relation between the voltage of the signal input end of the piezoelectric ceramic tube 6 and the outer diameter of the piezoelectric ceramic tube 6 is known;
the signal output end of the second voltage signal source 7 outputs a direct-current voltage signal, and the direct-current voltage signal is loaded to the signal input end of the piezoelectric ceramic tube 6 to control the outer diameter of the piezoelectric ceramic tube 6;
the optical fiber ring 5 is wound and fixed on the outer surface of the piezoelectric ceramic tube 6, as shown in figure 3;
the optical fiber coupler 4 is a 2×2 optical fiber coupler;
the signal processing and controlling system 9 consists of a sampling filter circuit 9-1 and a comparison output circuit 9-2;
the first signal input end of the sampling filter circuit 9-1 is the first signal input end of the signal processing and controlling system 9, the second signal input end of the sampling filter circuit 9-1 is the second signal input end of the signal processing and controlling system 9, the first signal output end of the comparison output circuit 9-2 is the first signal output end of the signal processing and controlling system 9, and the second signal output end of the comparison output circuit 9-2 is the second signal output end of the signal processing and controlling system 9; the second signal output end of the first voltage signal source 1 is connected with the first signal input end of the sampling filter circuit 9-1, the signal output end of the detector 8 is connected with the second signal input end of the sampling filter circuit 9-1, the first signal output end of the sampling filter circuit 9-1 is connected with the first signal input end of the comparison output circuit 9-2, the second signal output end of the sampling filter circuit 9-1 is connected with the second signal input end of the comparison output circuit 9-2, the first signal output end of the comparison output circuit 9-2 is connected with the signal input end of the second voltage signal source 7, and the second signal output end of the comparison output circuit 9-2 outputs a gyro output signal.
Working principle: the optical fiber coupler 4 and the optical fiber ring 5 form an optical fiber resonant cavity; the first voltage signal source 1 outputs a periodic triangular wave voltage signal to be loaded to a modulation signal input end of the laser 2 so as to tune the frequency of laser light output by the laser 2, meanwhile, the periodic triangular wave voltage signal is sent to the signal processing and control system 9, the laser 2 outputs continuous laser light with constant intensity to enter the polarization controller 3, the polarization controller 3 selects one polarization state of the laser light to be reserved, the laser light output by the polarization controller 3 enters the optical fiber resonant cavity, the line width of the laser light is smaller than the line width of a transmission valley of the optical fiber resonant cavity, therefore, the transmission spectrum of the optical fiber resonant cavity can be obtained, the transmission spectrum of the optical fiber resonant cavity is detected by the detector 8, the transmission spectrum signal output by the detector 8 enters the signal processing and control system 9, the signal processing and control system 9 acquires the periodic triangular wave voltage signal output by the first voltage signal source 1 and acquires the transmission spectrum signal, meanwhile, the signal processing and control system 9 outputs a control signal to be sent to the second voltage signal source 7 so as to control the voltage value of the direct current voltage signal output by the second voltage signal source 7, the outer diameter of the piezoelectric ceramic tube 6 is controlled, and finally, the signal processing and the signal control system 9 outputs the signal to output the signal with the rotation speed and the gyro direction;
when light enters the optical fiber resonant cavity, the product of the cavity length of the optical fiber resonant cavity and the refractive index of the optical fiber is an integral multiple of a plurality of light wavelengths, the light wavelengths are called as the resonant wavelength of the optical fiber resonant cavity, the light frequency corresponding to the resonant wavelength of the optical fiber resonant cavity is called as the resonant frequency of the optical fiber resonant cavity, the frequency interval between any two adjacent resonant frequencies of the optical fiber resonant cavity is equal, the frequency interval is called as the free spectrum width of the optical fiber resonant cavity, the light with the light frequency being the resonant frequency of the optical fiber resonant cavity can resonate in the optical fiber resonant cavity, and the transmittance of the light during resonance is minimum, therefore, the transmission spectrum of the optical fiber resonant cavity is a transmission valley with equal frequency interval, the frequency interval is the free spectrum width of the optical fiber resonant cavity, and the minimum transmittance of the transmission valley is the transmittance at the resonant frequency of the optical fiber resonant cavity;
before the fiber optic gyroscope is used, the process of zeroing under the static condition is as follows: firstly, the signal processing and control system 9 outputs a control signal to the second voltage signal source 7 so that the voltage value output by the second voltage signal source 7 is 0; then, the triangular wave voltage signal with the output period of T is sent to the signal processing and controlling system 9 by the first voltage signal source 1, and is loaded to the modulating signal input end of the laser 2 to tune the frequency of the laser output by the laser 2, since the maximum voltage value of the triangular wave voltage signal is set to be U2 and the minimum voltage value is set to be U1 (the sizes of U2 and U1 depend on the voltage-frequency tuning parameter of the laser 2 and the free spectrum width of the optical fiber resonant cavity when the optical fiber resonant cavity is stationary), the frequency tuning range of the laser output by the laser 2 can be equal to the free spectrum width of the optical fiber resonant cavity when the optical fiber resonant cavity is stationary, thus, the period of the transmission spectrum of the laser passing through the optical fiber resonant cavity is also T, each period of the transmission spectrum only comprises one transmission valley, the transmission spectrum of the optical fiber resonant cavity is detected by the detector 8, and the transmission spectrum signal output by the detector 8 enters the signal processing and controlling system 9; then, the signal processing and controlling system 9 acquires a triangular wave voltage signal and a transmission spectrum signal, compares the triangular wave voltage signal and the transmission spectrum signal on the same time axis, intercepts the same period of the triangular wave voltage signal and the transmission spectrum signal, takes the time corresponding to the voltage minimum U1 of the triangular wave voltage signal as the time origin, and reads the time t0 corresponding to the minimum transmittance of the transmission valley in the transmission spectrum signal;
the working process of the fiber optic gyroscope is as follows: firstly, the signal processing and control system 9 outputs a control signal to the second voltage signal source 7 so that the voltage value output by the second voltage signal source 7 is 0; then, the first voltage signal source 1 outputs a triangular wave voltage signal with the period of T to be sent to the signal processing and control system 9, the triangular wave voltage signal is loaded to the modulating signal input end of the laser 2 to tune the frequency of laser output by the laser 2, meanwhile, the transmission spectrum of the optical fiber resonant cavity with the period of T is detected by the detector 8, and the transmission spectrum signal output by the detector 8 enters the signal processing and control system 9; then, the signal processing and control system 9 acquires a triangular wave voltage signal and a transmission spectrum signal, if no transmission valley exists in the transmission spectrum signal, the signal processing and control system 9 outputs a control signal and sends the control signal to the second voltage signal source 7, so that the voltage value of the direct current voltage signal output by the second voltage signal source 7 is gradually increased, the outer diameter of the piezoelectric ceramic tube 6 is gradually reduced, and the radius of the optical fiber ring 5 is gradually reduced until the transmission valley exists in the transmission spectrum signal; then, the signal processing and controlling system 9 compares the triangular wave voltage signal and the transmission spectrum signal on the same time axis, intercepts the same period of the triangular wave voltage signal and the transmission spectrum signal, takes the time corresponding to the voltage minimum value U1 of the triangular wave voltage signal as the time origin, reads the time t1 corresponding to the minimum transmittance of the transmission valley in the transmission spectrum signal, if t1 is larger than t0, the rotation speed direction is clockwise, if t1 is smaller than t0, the rotation speed direction is anticlockwise, because the corresponding relation between the voltage of the modulation signal input end of the laser 2 and the laser frequency output by the laser 2 is known, and the corresponding relation between the voltage of the signal input end of the piezoelectric ceramic tube 6 and the outer diameter of the piezoelectric ceramic tube 6 is known, thus, the rotation speed is obtained from the absolute value of the difference between t1 and t0; finally, the signal processing and control system 9 outputs a gyroscopic output signal comprising the rotational speed and direction.
The working principle of the signal processing and control system 9:
before the fiber optic gyroscope is used, the process of zeroing under the static condition and the process of zeroing of the signal processing and control system 9 is as follows: firstly, the comparison output circuit 9-2 outputs a control signal 1 to be sent to the second voltage signal source 7, so that the voltage value output by the second voltage signal source 7 is 0; then, the sampling filter circuit 9-1 samples the triangular wave voltage signal with the period of T output by the first voltage signal source 1 and sends the triangular wave voltage signal to the comparison output circuit 9-2, and meanwhile, the sampling filter circuit 9-1 samples the transmission spectrum signal with the period of T output by the detector 8, filters the transmission spectrum signal and sends the transmission spectrum signal to the comparison output circuit 9-2; after the comparison output circuit 9-2 obtains the triangular wave voltage signal and the transmission spectrum signal, comparing the triangular wave voltage signal and the transmission spectrum signal on the same time axis, intercepting the same period of the triangular wave voltage signal and the transmission spectrum signal, taking the time corresponding to the voltage minimum U1 of the triangular wave voltage signal as the time origin, and reading the time t0 corresponding to the minimum transmittance of the transmission valley in the transmission spectrum signal;
when the fiber optic gyroscope works, the working process of the signal processing and controlling system 9 is as follows: firstly, the comparison output circuit 9-2 outputs a control signal 1 to be sent to the second voltage signal source 7, so that the voltage value output by the second voltage signal source 7 is 0; then, the sampling filter circuit 9-1 samples the triangular wave voltage signal with the period of T output by the first voltage signal source 1 and sends the triangular wave voltage signal to the comparison output circuit 9-2, and meanwhile, the sampling filter circuit 9-1 samples the transmission spectrum signal with the period of T output by the detector 8, filters the transmission spectrum signal and sends the transmission spectrum signal to the comparison output circuit 9-2; after the comparison output circuit 9-2 obtains the triangular wave voltage signal and the transmission spectrum signal, if no transmission valley exists in the transmission spectrum signal, the comparison output circuit 9-2 outputs the control signal 2 to be sent into the second voltage signal source 7, so that the voltage value of the direct current voltage signal output by the second voltage signal source 7 is gradually increased, the outer diameter of the piezoelectric ceramic tube 6 is gradually reduced, and the radius of the optical fiber ring 5 is gradually reduced until the transmission valley exists in the transmission spectrum signal; then, the comparison output circuit 9-2 compares the triangular wave voltage signal and the transmission spectrum signal on the same time axis, intercepts the same period of the triangular wave voltage signal and the transmission spectrum signal, takes the time corresponding to the voltage minimum value U1 of the triangular wave voltage signal as the time origin, reads the time t1 corresponding to the minimum transmittance of the transmission valley in the transmission spectrum signal, if t1 is larger than t0, the rotation speed direction is clockwise, if t1 is smaller than t0, the rotation speed direction is anticlockwise, and because the relation between the voltage of the modulation signal input end of the laser 2 and the laser frequency output by the laser 2 is known, and the relation between the voltage of the signal input end of the piezoelectric ceramic tube 6 and the outer diameter of the piezoelectric ceramic tube 6 is known, thus, the rotation speed is obtained from the absolute value of the difference between t1 and t0; finally, the comparison output circuit 9-2 outputs a gyro output signal including the magnitude and direction of the rotational speed.
Claims (4)
1. A large dynamic range resonance type fiber optic gyroscope comprises a first voltage signal source, a laser, a polarization controller, a fiber optic coupler, a fiber optic ring, a piezoelectric ceramic tube, a second voltage signal source, a detector and a signal processing and controlling system; the method is characterized in that: the first signal output end of the first voltage signal source is connected with the modulation signal input end of the laser, the second signal output end of the first voltage signal source is connected with the first signal input end of the signal processing and controlling system, the light output end of the laser is connected with the light input end of the polarization controller, the light output end of the polarization controller is connected with the first light input end of the optical fiber coupler, the optical fiber ring is respectively connected with the second light input end and the second light output end of the optical fiber coupler, the optical fiber ring is wound and fixed on the outer surface of the piezoelectric ceramic tube, the optical fiber coupler is a 2X 2 optical fiber coupler, the signal output end of the second voltage signal source is connected with the signal input end of the piezoelectric ceramic tube, the signal input end of the second voltage signal source is connected with the first signal output end of the signal processing and controlling system, the first light output end of the optical fiber coupler is connected with the light input end of the detector, and the signal output end of the detector is connected with the second signal input end of the signal processing and controlling system, and the signal output end of the second signal processing and controlling system is connected with the second signal input end of the signal processing and the gyroscope; the optical fiber coupler and the optical fiber ring form an optical fiber resonant cavity; the laser outputs continuous narrow linewidth laser with constant intensity and tunable frequency, the linewidth of the laser is smaller than that of a transmission trough of the optical fiber resonant cavity, the frequency of the laser corresponds to the voltage of a modulation signal input end of the laser, the larger the voltage is, the larger the laser frequency is, and the smaller the voltage is, the smaller the laser frequency is; the first signal output end and the second signal output end of the first voltage signal source output the same periodic triangular wave voltage signal, the maximum voltage value of the periodic triangular wave voltage signal is U2, the minimum voltage value of the periodic triangular wave voltage signal is U1, and the periodic triangular wave voltage signal is loaded to the modulation signal input end of the laser, so that the frequency tuning range of laser output by the laser is equal to the free spectrum width when the optical fiber resonant cavity is stationary; the change of the outer diameter of the piezoelectric ceramic tube corresponds to the voltage of the signal input end of the piezoelectric ceramic tube, the smaller the voltage is, the larger the outer diameter of the piezoelectric ceramic tube is, and the larger the voltage is, the smaller the outer diameter of the piezoelectric ceramic tube is; the signal output end of the second voltage signal source outputs a direct-current voltage signal, and the direct-current voltage signal is loaded to the signal input end of the piezoelectric ceramic tube to control the outer diameter of the piezoelectric ceramic tube;
when the fiber optic gyroscope works, the signal processing and control system outputs a control signal to be sent into the second voltage signal source, so that the voltage value output by the second voltage signal source is 0; then, the first voltage signal source outputs a triangular wave voltage signal with the period of T to a signal processing and controlling system, the triangular wave voltage signal is loaded to a modulation signal input end of a laser, meanwhile, a transmission spectrum of an optical fiber resonant cavity with the period of T is detected by a detector, and a transmission spectrum signal output by the detector enters the signal processing and controlling system; then, the signal processing and control system acquires a triangular wave voltage signal and a transmission spectrum signal, if no transmission valley exists in the transmission spectrum signal, the signal processing and control system outputs a control signal and sends the control signal to a second voltage signal source, so that the voltage value of a direct current voltage signal output by the second voltage signal source is gradually increased, the outer diameter of the piezoelectric ceramic tube is gradually reduced, and the radius of the optical fiber ring is gradually reduced until the transmission valley exists in the transmission spectrum signal; then, the signal processing and controlling system compares the triangular wave voltage signal and the transmission spectrum signal on the same time axis, intercepts the same period of the triangular wave voltage signal and the transmission spectrum signal, takes the moment corresponding to the voltage minimum U1 of the triangular wave voltage signal as the time origin, reads the moment t1 corresponding to the minimum transmissivity of the transmission valley in the transmission spectrum signal, if the moment t1 is larger than the moment t0, the rotation speed direction is clockwise, if the moment t1 is smaller than the moment t0, the rotation speed direction is anticlockwise, and the rotation speed is obtained by the absolute value of the difference between the moment t1 and the moment t0; the time T0 is a time origin corresponding to a time corresponding to a voltage minimum U1 of the triangular wave voltage signal with a period T output by the first voltage signal source under the static condition, the signal processing and control system compares the triangular wave voltage signal with the transmission spectrum signal on the same time axis, intercepts the same period of the triangular wave voltage signal and the transmission spectrum signal, and reads a time corresponding to a minimum transmittance of a transmission valley in the transmission spectrum signal by taking the time corresponding to the voltage minimum U1 of the triangular wave voltage signal as the time origin; finally, the signal processing and control system outputs a gyro output signal, wherein the gyro output signal comprises the rotation speed and the rotation direction.
2. The high dynamic range resonant fiber optic gyroscope of claim 1, wherein: the signal processing and controlling system comprises a sampling filter circuit and a comparison output circuit; the first signal input end of the sampling filter circuit is the first signal input end of the signal processing and controlling system, the second signal input end of the sampling filter circuit is the second signal input end of the signal processing and controlling system, the first signal output end of the comparison output circuit is the first signal output end of the signal processing and controlling system, and the second signal output end of the comparison output circuit is the second signal output end of the signal processing and controlling system; the second signal output end of the first voltage signal source is connected with the first signal input end of the sampling filter circuit, the signal output end of the detector is connected with the second signal input end of the sampling filter circuit, the first signal output end of the sampling filter circuit is connected with the first signal input end of the comparison output circuit, the second signal output end of the sampling filter circuit is connected with the second signal input end of the comparison output circuit, the first signal output end of the comparison output circuit is connected with the signal input end of the second voltage signal source, and the second signal output end of the comparison output circuit outputs a gyro output signal.
3. A high dynamic range resonant fiber optic gyroscope according to claim 3, wherein: when the fiber optic gyroscope works, the comparison output circuit outputs a control signal 1 to be sent into a second voltage signal source, so that the voltage value output by the second voltage signal source is 0; then, the sampling filter circuit samples the triangular wave voltage signal with the period of T output by the first voltage signal source and sends the triangular wave voltage signal into the contrast output circuit, and meanwhile, the sampling filter circuit samples the transmission spectrum signal with the period of T output by the detector, filters the transmission spectrum signal and sends the transmission spectrum signal into the contrast output circuit; after the contrast output circuit obtains the triangular wave voltage signal and the transmission spectrum signal, if no transmission valley exists in the transmission spectrum signal, the contrast output circuit outputs a control signal 2 to be sent into a second voltage signal source, so that the voltage value of a direct current voltage signal output by the second voltage signal source is gradually increased, the outer diameter of the piezoelectric ceramic tube is gradually reduced, and the radius of the optical fiber ring is gradually reduced until the transmission valley exists in the transmission spectrum signal; then, the contrast output circuit compares the triangular wave voltage signal and the transmission spectrum signal on the same time axis, intercepts the same period of the triangular wave voltage signal and the transmission spectrum signal, takes the moment corresponding to the voltage minimum U1 of the triangular wave voltage signal as the time origin, reads the moment t1 corresponding to the minimum transmittance of the transmission trough in the transmission spectrum signal, if the moment t1 is larger than the moment t0, the rotation speed direction is clockwise, if the moment t1 is smaller than the moment t0, the rotation speed direction is anticlockwise, and the rotation speed is obtained by the absolute value of the difference between the moment t1 and the moment t0; finally, the comparison output circuit outputs a gyro output signal, wherein the gyro output signal comprises the rotation speed and the rotation direction.
4. A high dynamic range resonant fiber optic gyroscope according to any of claims 1-3, wherein: before the fiber optic gyroscope is used, the method of 'zeroing' and 'zeroing' under the static condition is as follows, the comparison output circuit outputs a control signal 1 to be sent into a second voltage signal source, so that the voltage value output by the second voltage signal source is 0; then, the sampling filter circuit samples the triangular wave voltage signal with the period of T output by the first voltage signal source and sends the triangular wave voltage signal into the contrast output circuit, and meanwhile, the sampling filter circuit samples the transmission spectrum signal with the period of T output by the detector, filters the transmission spectrum signal and sends the transmission spectrum signal into the contrast output circuit; after the comparison output circuit obtains the triangular wave voltage signal and the transmission spectrum signal, the triangular wave voltage signal and the transmission spectrum signal are compared on the same time axis, the same period of the triangular wave voltage signal and the transmission spectrum signal is intercepted, the time corresponding to the voltage minimum U1 of the triangular wave voltage signal is taken as the time origin, and the time t0 corresponding to the minimum transmittance of the transmission trough in the transmission spectrum signal is read.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211561641.5A CN116086423A (en) | 2022-12-07 | 2022-12-07 | Large dynamic range resonant fiber optic gyroscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211561641.5A CN116086423A (en) | 2022-12-07 | 2022-12-07 | Large dynamic range resonant fiber optic gyroscope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116086423A true CN116086423A (en) | 2023-05-09 |
Family
ID=86201572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211561641.5A Pending CN116086423A (en) | 2022-12-07 | 2022-12-07 | Large dynamic range resonant fiber optic gyroscope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116086423A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117128945A (en) * | 2023-10-20 | 2023-11-28 | 中北大学 | Super-sensitive angular velocity sensor based on singular surface and measuring method |
-
2022
- 2022-12-07 CN CN202211561641.5A patent/CN116086423A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117128945A (en) * | 2023-10-20 | 2023-11-28 | 中北大学 | Super-sensitive angular velocity sensor based on singular surface and measuring method |
| CN117128945B (en) * | 2023-10-20 | 2023-12-26 | 中北大学 | Super-sensitive angular velocity sensor based on singular surface and measuring method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4707136A (en) | Gated fiber optic rotation sensor with linearized scale factor | |
| RU2398185C2 (en) | Device and method of using oppositely propagating signal for locating events | |
| US4530603A (en) | Stabilized fiber optic sensor | |
| US4960319A (en) | Active polarization control servo and method | |
| US4853534A (en) | Optical fiber sensing system | |
| US4302970A (en) | Optical temperature probe employing rare earth absorption | |
| CN105953825B (en) | For temperature and the fiber Bragg grating type sensor-based system and method for strain measurement simultaneously | |
| CN116086423A (en) | Large dynamic range resonant fiber optic gyroscope | |
| KR960015900B1 (en) | Polarimetric fiber laser sensor | |
| CN107356412B (en) | A kind of measurement method of the measuring system based on rare-earth doped optical fibre refractive index | |
| CN116026306B (en) | Gyroscope based on low-coherence light source and angular velocity measurement method thereof | |
| WO2020248481A1 (en) | Evanescent-field-based gas detection device and evanescent-field-based gas detection method | |
| JPH0232561B2 (en) | ||
| CN114018171B (en) | High-resolution strain sensor based on differential optical fiber resonant cavity | |
| Barnes et al. | Loss determination in microsphere resonators by phase-shift cavity ring-down measurements | |
| NO850599L (en) | FIBEROPTIC ROTATION SENSOR | |
| US5022754A (en) | Determining the wavelength of optical radiation | |
| AU559851B2 (en) | Sensor using fiber optic interferometer | |
| CN117387591B (en) | On-chip high-sensitivity angular velocity sensor based on second-order singular surface and measuring method | |
| Xu et al. | Refractive index sensor based on θ-shaped microfiber resonator and Vernier effect | |
| Liu et al. | Refractive Index Sensor Based on Few-mode Silicon-Nitride Micro-Ring Resonator | |
| CA1203702A (en) | Method of measuring the cutoff wavelength of the first higher order mode in optical fibres | |
| KR100516006B1 (en) | Multimode optical fiber gyrometer, with improved resolution and stability | |
| CN114459458B (en) | Optical gyroscope based on double-helix four-port micro-nano optical fiber resonant cavity | |
| CN116678389A (en) | Resonant fiber optic gyroscope based on broadband light source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |