CN102636163B - Resetting locking method and device of resonance type optic gyroscope - Google Patents
Resetting locking method and device of resonance type optic gyroscope Download PDFInfo
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- CN102636163B CN102636163B CN201210110119.5A CN201210110119A CN102636163B CN 102636163 B CN102636163 B CN 102636163B CN 201210110119 A CN201210110119 A CN 201210110119A CN 102636163 B CN102636163 B CN 102636163B
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- 230000003287 optical effect Effects 0.000 claims description 38
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Abstract
The invention discloses a resetting locking method and device of a resonance type optic gyroscope. A tunable voltage range of a laser device is [Vmin, Vmax], and an upper limit and a lower limit of a set threshold value of feedback voltage of the laser device are respectively VT-max and VT-min; the upper limit VT-max of the threshold value voltage is less than the upper limit Vmax of the tunable voltage of the laser device, and the lower limit VT-min of the threshold value voltage is greater than the lower limit Vmin of the tunable voltage; when the feedback voltage of the laser device exceeds the upper limit VT-max of the set threshold value, the feedback voltage of the laser device is reduced by p*VFSR (Variable Frequency Speed Regulation), wherein p is an integer; the VFSR is a tuning voltage range corresponding to a free spectral width of a resonance cavity; and when the feedback voltage of the laser device is lower than the lower limit VT-min of the set threshold value, the feedback voltage of the laser device is increased by the p*VFSR. The resetting locking method and device of the resonance type optic gyroscope disclosed by the invention have the advantages of simplicity and effectiveness, do not increase the extra hardware load, and solve the problem that the resonance type optic gyroscope cannot be locked in a full-temperature range on the base of software, so that the resonance type optic gyroscope can work under various environments for a long period of time.
Description
Technical field
The present invention relates to the lock-in techniques of resonance type optical gyroscope, relate in particular to a kind of reset locking method and device thereof of resonance type optical gyroscope.
Background technology
Resonance type optical gyroscope is a kind of high precision inertial sensor of realizing angular velocity detection based on Sagnac effect, and it comprises resonance type optical fiber gyro, resonant mode integrated waveguide gyro etc., and all take resonator cavity as basic optical gyroscope.
Resonance type optical gyroscope, by detecting the resonance frequency difference producing along counterclockwise propagation light in optical resonator, obtains the angular velocity of rotation of object.In order to realize the detection of gyro turn signal, contrary (suitable) conterclockwise resonance frequency is followed the tracks of by the centre frequency of laser instrument, along the difference of (contrary) conterclockwise resonance frequency and laser instrument centre frequency, as the rotation of resonance type optical gyroscope, exports.The process that resonance frequency is followed the tracks of by laser instrument centre frequency is exactly lock-in techniques classical in resonance type optical gyroscope.
The speed of the resonance frequency drift of Si based waveguides or optical fiber is very fast.SiO
2refractive index variation with temperature coefficient be about 10
-5/ ℃, so resonance frequency will be with the rate drift of 1.33GHz/ ℃.In optical fiber cavity, there is Similar Problems.Due to the restriction of feedback voltage scope, laser instrument cannot be followed the tracks of resonance frequency within the scope of full temperature.The tuning coefficient of supposing laser instrument centre frequency is 50MHz/V, the tuning voltage scope of feedback is 10V, laser instrument can only be followed the tracks of the resonance frequency drift of 500MHz so, the i.e. temperature variation of 0.4 ℃, this has limited the work of resonance type optical gyroscope within the scope of full temperature, has retrained its practical application.
Summary of the invention
The object of the invention is to overcome resonance type optical gyroscope lock-in techniques cannot follow the tracks of the problem of resonance frequency within the scope of full temperature, and a kind of reset locking method and device thereof of resonance type optical gyroscope is provided.
The reset locking method of resonance type optical gyroscope is: the tunable voltage scope of laser instrument is [V
min, V
max], the setting threshold upper and lower bound of laser instrument feedback voltage is respectively V
t-maxand V
t-min, the upper limit V of threshold voltage
t-maxbe less than the upper limit V of the tunable voltage of laser instrument
max, the lower limit V of threshold voltage
t-minbe greater than the lower limit V of tunable voltage
min, when the feedback voltage of laser instrument surpasses the upper threshold V setting
t-maxtime, the feedback voltage decline p * V of laser instrument
fSR, wherein p is integer, V
fSRit is the tuning voltage scope that the free spectrum width of resonator cavity is corresponding; When the feedback voltage of laser instrument is lower than the threshold value lower limit V setting
t-mintime, the feedback voltage rising p * V of laser instrument
fSR.
Sagnac effect generation device, servo controller, reset controller that the reset locking device of resonance type optical gyroscope comprises laser instrument, the optical resonator of take is core; The Sagnac effect generation device that laser instrument, the optical resonator of take are core, servo controller, reset controller are connected in turn; Servo controller and reset controller can be realized on an on-site programmable gate array FPGA, complex programmable logic device (CPLD) or DSP microprocessor chip.
The reset locking method and apparatus of resonance type optical gyroscope provided by the invention, effectively simple, do not increase extra hardware burden, from software, solve the problem that resonance type optical gyroscope cannot lock within the scope of full temperature, made can be in the various environment long-term stable work of resonance type optical gyroscope.
Accompanying drawing explanation
Fig. 1 is typical tuning curve schematic diagram;
Fig. 2 is the method flow diagram of resonance type optical gyroscope reset locking;
Fig. 3 is the reset locking apparatus structure schematic diagram of resonance type optical gyroscope;
In figure: Sagnac effect generation device 2, servo controller 3, reset controller 4 that laser instrument 1, the optical resonator of take are core.
Embodiment
As shown in Figure 1, tuning curve, with free spectrum width periodic extension, is the operation interval of resonance type optical gyroscope between resonance region.The resonance frequency of optical resonator is with temperature drift, full the frequency of laser instrument cannot be followed the tracks of certain resonance frequency within the scope of temperature.When the centre frequency of laser instrument cannot be followed the tracks of resonance frequency, utilize the periodicity of tuning curve, can jump in the mode of resonance of adjacent one or several free spectrum width, make the centre frequency of laser instrument can follow the tracks of fast resonance frequency, and do not affect the normal work of resonance type optical gyroscope.The basic thought of resonance type optical gyroscope reset locking technology that Here it is.
As shown in Figure 2, the reset locking method of resonance type optical gyroscope is: the tunable voltage scope of laser instrument is [V
min, V
max], the setting threshold upper and lower bound of laser instrument feedback voltage is respectively V
t-maxand V
t-min, the upper limit V of threshold voltage
t-maxbe less than the upper limit V of the tunable voltage of laser instrument
max, the lower limit V of threshold voltage
t-minbe greater than the lower limit V of tunable voltage
min, when the feedback voltage of laser instrument surpasses the upper threshold V setting
t-maxtime, the feedback voltage decline p * V of laser instrument
fSR, wherein p is integer, V
fSRit is the tuning voltage scope that the free spectrum width of resonator cavity is corresponding; When the feedback voltage of laser instrument is lower than the threshold value lower limit V setting
t-mintime, the feedback voltage rising p * V of laser instrument
fSR.By above-mentioned operation, the centre frequency of laser instrument always drops between the resonance region of optical resonator, and laser instrument can be followed the tracks of the resonance frequency of resonator cavity rapidly; Feedback voltage always drops on the upper limit V of threshold value
t-maxwith lower limit V
t-minbetween, solved the inadequate problem of feedback voltage scope.
As shown in Figure 3, the Sagnac effect generation device 2 that the reset locking device of resonance type optical gyroscope comprises laser instrument 1, the optical resonator of take is core, servo controller 3, reset controller 4; The Sagnac effect generation device 2 that laser instrument 1, the optical resonator of take are core, servo controller 3, reset controller 4 are connected in turn.Light that laser instrument 1 sends is through take the Sagnac effect generation device 2 that optical resonator is core, output error signal E1 and E2.E1, through servo controller 3 and reset controller 4, feeds back to laser instrument, controls the resonance frequency that the centre frequency of laser instrument is followed the tracks of upper resonator cavity, the locking road of Here it is resonance type optical gyroscope.Error signal E2 is as the turn signal output of resonance type optical gyroscope.The Sagnac effect generation device 2 that the optical resonator of take is core, has comprised all optical resonators (reflection cavity, transmission chamber etc.) and all modulation-demodulation devices (phasing technique etc.).Servo controller 3 is algorithms of FEEDBACK CONTROL laser instrument, as pid algorithm.Reset controller 4 judges whether feedback voltage exceeds the voltage range of setting, with this, makes the decision that whether needs reset, realizes the reset locking method of resonance type optical gyroscope.Servo controller 3 and reset controller 4 can be realized on the chips such as an on-site programmable gate array FPGA, complex programmable logic device (CPLD) and DSP microprocessor.
Claims (1)
1. a reset locking method for resonance type optical gyroscope, the tunable voltage scope that it is characterized in that laser instrument is [V
min, V
max], the setting threshold upper and lower bound of laser instrument feedback voltage is respectively V
t-maxand V
t-min, the upper limit V of threshold voltage
t-maxbe less than the upper limit V of the tunable voltage of laser instrument
max, the lower limit V of threshold voltage
t-minbe greater than the lower limit V of tunable voltage
min, when the feedback voltage of laser instrument surpasses the upper threshold V setting
t-maxtime, the feedback voltage decline p * V of laser instrument
fSR, wherein p is integer, V
fSRit is the tuning voltage scope that the free spectrum width of resonator cavity is corresponding; When the feedback voltage of laser instrument is lower than the threshold value lower limit V setting
t-mintime, the feedback voltage rising p * V of laser instrument
fSR.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210110119.5A CN102636163B (en) | 2012-04-16 | 2012-04-16 | Resetting locking method and device of resonance type optic gyroscope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210110119.5A CN102636163B (en) | 2012-04-16 | 2012-04-16 | Resetting locking method and device of resonance type optic gyroscope |
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| CN102636163A CN102636163A (en) | 2012-08-15 |
| CN102636163B true CN102636163B (en) | 2014-09-17 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339032A (en) * | 2008-08-12 | 2009-01-07 | 北京航空航天大学 | Resonance type optical gyroscope signal checking method |
| CN102331258A (en) * | 2011-07-12 | 2012-01-25 | 浙江大学 | Two-path loop-locked resonant mode optical gyro |
| CN102353373A (en) * | 2011-07-12 | 2012-02-15 | 浙江大学 | Double-closed loop locking technology-based resonant optical gyro |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7372574B2 (en) * | 2005-12-09 | 2008-05-13 | Honeywell International Inc. | System and method for stabilizing light sources in resonator gyro |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339032A (en) * | 2008-08-12 | 2009-01-07 | 北京航空航天大学 | Resonance type optical gyroscope signal checking method |
| CN102331258A (en) * | 2011-07-12 | 2012-01-25 | 浙江大学 | Two-path loop-locked resonant mode optical gyro |
| CN102353373A (en) * | 2011-07-12 | 2012-02-15 | 浙江大学 | Double-closed loop locking technology-based resonant optical gyro |
Non-Patent Citations (2)
| Title |
|---|
| 基于单片FPGA的谐振式光纤陀螺数字系统设计与实现;姚灵芝等;《传感技术学报》;20110930;第24卷(第9期);第1260-1264页 * |
| 姚灵芝等.基于单片FPGA的谐振式光纤陀螺数字系统设计与实现.《传感技术学报》.2011,第24卷(第9期),第1260-1264页. |
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