CN102506846A - Dispersion control method for zeeman laser gyroscope - Google Patents
Dispersion control method for zeeman laser gyroscope Download PDFInfo
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- CN102506846A CN102506846A CN2011103008872A CN201110300887A CN102506846A CN 102506846 A CN102506846 A CN 102506846A CN 2011103008872 A CN2011103008872 A CN 2011103008872A CN 201110300887 A CN201110300887 A CN 201110300887A CN 102506846 A CN102506846 A CN 102506846A
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Abstract
The invention belongs to the field of optics and relates to a dispersion control method for a zeeman laser gyroscope. The method comprises the following steps of: taking an offset frequency volume and a temperature as a control parameter and a control switch; establishing a dispersion control model, namely, delta V=F (fb, T); controlling the offset volume delta V of a work voltage of a component by cavity length; and setting a working point offset of a zeeman laser gyroscope frequency-stabilizing system, thereby realizing the dispersion control. A dynamic compensating control device is established, and a dispersion error caused by the violent change of the temperature of a resonant cavity is compensated by the working point of the cavity length under real-time control, thereby greatly weakening and even eliminating a zero offset transition process of a full-solid laser gyroscope, realizing the quick starting and the performance improvement of the full-solid laser gyroscope, and further widening the application field of the gyroscope.
Description
Technical field
The invention belongs to optical field, relate to a kind of zeeman laser gyro chromatic dispersion control method.
Background technology
The zeeman laser gyro adopts circularly polarized light work, utilizes Zeeman effect to realize offset frequency, is the laser gyro of a kind of all solid state, resisting strong impact and vibration.Utilize the Zeeman effect offset frequency, changed the dispersion characteristics of gain medium, make the gyro performance receive the influence of dispersion characteristics.
The chromatic dispersion of medium is seen that from phenomenon showing as medium has different propagation velocity to the incident light wave of different frequency, thereby is had different refractive indexes.Can know that by Maxwell's Theory of Electromagnetic Field the refractive index of medium and the light wave speed in medium all depends on the DIELECTRIC CONSTANTS of medium, so ε is not a constant, but the function of incident light wave frequencies omega.Because the frequency of operation of suitable in the laser gyro, contrary two light beams is in the resonance absorption zone of interacvity gain medium, therefore two light beams are operated in the anomalous dispersion district of interacvity gain medium, and are as shown in Figure 1.Under the action of a magnetic field, along with the division of Zeeman gyro two light beam energy levels and gain trace, the dispersion curve in the interacvity gain medium also will divide, and will be as shown in Figure 2.Because dispersion characteristics are relevant with the gain characteristic of gyro, shown in formula (1), after laser gyro is ignited; Violent variation will take place in the temperature of gain media; The characteristic of gain media is changed, shown in formula (2), thereby cause the chromatic dispersion field of interacvity gain medium that acute variation takes place.Under normal frequency stabilization condition, the acute variation of dispersion curve will cause can not cancelling out each other at the effect of dispersion of positive and negative half offset frequency in the cycle along (contrary) light beam, and this will last till always that in the discharge tube tend towards stability in the temperature field.
Because G (ξ)/L is the gain coefficient of unit length gain media, ku=Δ ω
D/ (2 (ln2)
1/2), Δ ω
DIt is the half-peak value width of dopplerbroadening.
Chromatic dispersion increases with the increase of operation material gain coefficient, and under the situation of gain stabilization, the inhomogeneous broadening of gas is:
M is an atomic weight, can be found out by following formula, and the inhomogeneous broadening of gas and the temperature of gas are directly proportional, and the temperature variation of gas will produce significant effects to the gyro performance.
Can know by the effect of dispersion analysis; It is that variation of temperature by gain media in the start process causes that the effect of dispersion of Zeeman gyro changes; Show as Zeeman gyro gyro internal temperature in the first few minutes of energising violent variation takes place, cause gyro pulse output that transient state process is arranged.
In the process of gyro operate as normal, need carry out frequency stabilization to gyro.It is long that the purpose of frequency stabilization is exactly steady chamber, and the chamber length here refers to optical cavity length, and it receives refractive index and the long influence of geometry cavity in the chamber simultaneously.Through selecting the frequency stabilization point, can control the dispersion characteristics of light wave in medium.Generally speaking, during gyro work, frequency all is chosen in zero chromatic dispersion (perhaps equivalent chromatic dispersion is zero) and locates, and still, start process has destroyed this relation.
Summary of the invention
The present invention seeks to: the zeeman laser gyro chromatic dispersion control method that provides a kind of and can shorten start-up time, improves precision.
Technical scheme of the present invention is: a kind of zeeman laser gyro chromatic dispersion control method, it comprises the steps:
Step 1: offset frequency amount and frequency stabilization voltage are demarcated:
Calibration process is divided into static demarcating and dynamic calibration, and static demarcating is meant that gyro is in the certain environment temperature T
1Down, gyro and environment temperature realize thermal equilibrium, and the gyro start realizes steady operation, is no less than 10 minutes stabilization time, detect and obtain T
1The offset frequency amount of gyro is f under the temperature
B1With frequency stabilization voltage V
T1Change environment temperature to T
2, press similarity condition, detect and obtain T
2The offset frequency amount f of gyro under the temperature
B2With frequency stabilization voltage V
T2, demarcate choosing of environment temperature and be provided with respectively according to different property of gyroscopes and performance with the temperature step-length, by that analogy, realize offset frequency amount and frequency stabilization voltage static demarcating in the full temperature working range, set up offset frequency amount and functional relationship of temperature f
BT=F
1(T) and frequency stabilization voltage and functional relationship of temperature V
T=F
2(T);
The process of dynamic calibration and static demarcating process are basic identical, after difference is that each temperature spot reaches thermal equilibrium, and record frequency stabilization control voltage V
0, then gyro frequency stabilization control loop is in the open loop state of a control, voltage deviation Δ V is controlled in frequency stabilization, record offset frequency amount changing value is Δ f
b, the variation range of frequency stabilization voltage can be provided with respectively according to different property of gyroscopes and performance with change step, sets up offset frequency amount f
bRelation with frequency stabilization voltage variety Δ V, temperature T: Δ V=F
3(T, Δ f
b);
Static demarcating and dynamic calibration data are stored in the circuit controller with data form or function mode respectively;
Step 2: survey offset frequency amount and demodulation filtering:
Obtain initial temperature T, through the SIN/COS signal after the detection gyro light-to-current inversion, filtering noise separates extraneous input speed, obtains the offset frequency value f of gyro
B4, calculating needs the offset frequency amount Δ f of compensation
b=f
B4-f
BT
Step 3: chromatic dispersion control:
By V
T=F
2Frequency stabilization closed-loop control voltage when (T), obtaining temperature T is V
T, with the offset frequency value Δ f that obtains
bSubstitution function Δ V=F
3(T, Δ f
b) in, calculate corresponding frequency stabilization bias voltage Δ V by controller, provide frequency stabilization control voltage V=V
T-Δ V;
Step 4: the long assembly control in chamber:
Under the effect of frequency stabilization control voltage V, the long Control Component mirror reflection surface in chamber will advance or retreat, and micrometric displacement takes place; Reach and change the long purpose in gyro resonator cavity chamber; Through the long assembly of control chamber, realization is moved zeeman laser gyro working point, thereby realizes the compensation to the offset frequency amount;
Repeating step 2 is to step 4, up to Δ f
b=0 or Δ V=0, the frequency stabilization control loop changes closed-loop control over to, and dispersion compensation finishes.
Technique effect of the present invention is: the present invention utilizes zeeman laser gyro frequency stabilization system operating bias process setting, realizes that gyro is suitable, backlight bundle dispersion differences is identical, realizes the dynamic compensation that changes partially for gyro zero.Utilize the frequency stabilization bias point; Realization chromatic dispersion control; Set up the dynamic compensation control device, through the long working point compensation of real-time control chamber because the error dispersion that resonator cavity temperature acute variation causes, thereby weaken greatly even eliminate all-solid state laser gyro zero inclined to one side transient process; Realized that the all-solid state laser gyro starts and performance raising improvement simultaneously fast, has further expanded the application of this type gyro.
Description of drawings
The gain trace of Fig. 1 zeeman laser and dispersion curve;
Fig. 2 is the division of gain trace and dispersion curve in the zeeman laser gyro;
Fig. 3 is that curve is represented in the chromatic dispersion of gyro mode voltage and gyro offset frequency amount;
Fig. 4 is that curve is represented in the chromatic dispersion of gyro mode voltage and gyro light intensity;
Fig. 5 is a zeeman laser gyro chromatic dispersion control synoptic diagram of the present invention;
Fig. 6 is error dispersion control compensation effect contrast figure.
Embodiment
Through specific embodiment the present invention is done further explanation below:
In the zeeman laser gyro, when not having magnetic field, do not take place frequently to split, two in opposite directions light beam have identical chamber frequency, be adjusted to usually and equal gain trace centre frequency v
0The place; After adding longitudinal magnetic field, gain trace will split into low frequency curve (v
D -) and high frequency curve (v
D +), as shown in Figure 2, while dispersion curve n
0Also will split into n
-And n
+, as shown in Figure 2, wherein, low frequency curve (v
D -) corresponding dispersion curve n
-, high frequency curve (v
D +) corresponding dispersion curve n
+
In the gyro course of work, if certain some place is operated in low frequency curve (v along (contrary) light beam in half offset frequency just in the cycle
D -) on, then in negative half offset frequency in the cycle, because the change of magnetic direction, this some place will be operated in high frequency curve (v along (contrary) light beam
D +) on, dispersion curve corresponding with it also will transfer n+ to by n-.Light intensity suitable in order to guarantee, the backlight bundle equates, generally the frequency stabilization working point is selected in centre frequency v
0The place.Reached steady state (SS) like fruit caving internal dispersion field (being closely related), then can know Δ n by symmetry with the cavity temperature field
+=Δ n
-, then just can cancel out each other at the effect of dispersion of half offset frequency in the cycle just with the negative effect of dispersion of half offset frequency in the cycle along (contrary) light beam.This point is corresponding to general frequency stabilization working point, and corresponding frequency of operation is v
q, as can be seen from Figure 2, change the position of frequency stabilization working point, can therefore, adopt frequency stabilization working point location bias so that the light beam of suitable inverse clock is operated under the different dispersion values, will change the chromatic dispersion working point, thereby realize gyro zero inclined to one side control.
Discover that the gyro dispersion characteristics show in the variation of offset frequency amount, and are as shown in Figure 3, near the gyro working point, change gyro frequency stabilization working point, with producing the zero inclined to one side variation of gyro offset frequency amount and gyro.Change the voltage of frequency stabilization point, also will change the position and the dispersion characteristics of gyro working point simultaneously, the zero inclined to one side relation of frequency stabilization piezoelectric voltage position and gyro is as shown in Figure 4.
The effect of dispersion acute variation came from the acute variation of temperature after the zeeman laser gyro started; If change the frequency stabilization working point; In the equivalent chromatic dispersion of an offset frequency in the cycle constant error will appear along (contrary) light beam; Rationally this error magnitude of control can be cancelled out each other with the error dispersion that temperature variation causes, thereby realizes dispersion compensation.For this reason, the present invention proposes the dispersion compensation method based on long working point, control resonator cavity chamber, as controlled variable and CS, sets up the chromatic dispersion controlling models, i.e. Δ V=F (f with offset frequency amount and temperature
b, T),, realize the control compensation of error dispersion through the WV amount of bias Δ V of the long Control Component in chamber.
As shown in Figure 5, it is the chromatic dispersion control synoptic diagram of zeeman laser gyro chromatic dispersion control method of the present invention.The step of zeeman laser gyro chromatic dispersion control method of the present invention is following:
Step 1: offset frequency amount and frequency stabilization voltage are demarcated: calibration process is divided into static demarcating and dynamic calibration, and static demarcating is meant that gyro is in the certain environment temperature T
1Down, gyro and environment temperature realize thermal equilibrium, and the gyro start realizes steady operation, is no less than 10 minutes stabilization time usually, detect and obtain T
1The offset frequency amount of gyro is f under the temperature
B1With frequency stabilization voltage V
T1Change environment temperature to T
2, press similarity condition, detect and obtain T
2The offset frequency amount f of gyro under the temperature
B2With frequency stabilization voltage V
T2, demarcating choosing with the temperature step-length of environment temperature can be provided with respectively according to different property of gyroscopes and performance, by that analogy, realizes offset frequency amount and frequency stabilization voltage static demarcating in the full temperature working range, sets up offset frequency amount and functional relationship of temperature f
BT=F
1(T) and frequency stabilization voltage and functional relationship of temperature V
T=F
2(T).The process of dynamic calibration and static demarcating process are basic identical, after difference is that each temperature spot reaches thermal equilibrium, and record frequency stabilization control voltage V
0, then gyro frequency stabilization control loop is in the open loop state of a control, voltage deviation Δ V is controlled in frequency stabilization, record offset frequency amount changing value is Δ f
b, the variation range of frequency stabilization voltage can be provided with respectively according to different property of gyroscopes and performance with change step, sets up offset frequency amount f
bRelation with frequency stabilization voltage variety Δ V, temperature T: Δ V=F
3(T, Δ f
b).Static demarcating and dynamic calibration data are stored in the circuit controller with data form or function mode respectively.
Step 2: survey offset frequency amount and demodulation filtering: obtain initial temperature T, through the SIN/COS signal after the detection gyro light-to-current inversion, filtering noise separates extraneous input speed, obtains the offset frequency value f of gyro
B4, calculating needs the offset frequency amount Δ f of compensation
b=f
B4-f
BT
Step 3: chromatic dispersion control: by V
T=F
2Frequency stabilization closed-loop control voltage when (T), obtaining temperature T is V
TWith the offset frequency value Δ f that obtains
bSubstitution function Δ V=F
3(T, Δ f
b) in, calculate corresponding frequency stabilization bias voltage Δ V by controller; Finally provide frequency stabilization control voltage V=V
T-Δ V.
Step 4: the long assembly control in chamber: under the effect of frequency stabilization control voltage V; The long Control Component mirror reflection surface in chamber will advance or retreat; Micrometric displacement takes place, and reaches the purpose that changes gyro resonator cavity chamber length, through the long assembly of control chamber; Realization is moved zeeman laser gyro working point, thereby realizes the compensation to offset frequency amount (chromatic dispersion).
Repeating step 2 is to step 4, up to Δ f
b=0 or Δ V=0, the frequency stabilization control loop changes closed-loop control over to, and dispersion compensation finishes.
The present invention is based on the dispersive model curve and the data solver of construction, start normal back at gyro and force gyro to be operated in the CCP, thereby realize chromatic dispersion control through setting long operating point, chamber.After adopting chromatic dispersion control compensation technology; The startup trend term contrast improvement situation of all-solid state laser gyro is as shown in Figure 6, and comparison is found, after utilization changes the dispersion compensation of working point; All-solid state laser gyro zero transient process partially was reduced to almost nil by original about 5 minutes; Shortened gyro setup time greatly, having realized that the all-solid state laser gyro starts to improve simultaneously with performance fast improves, and has further expanded the application of this type gyro.
The present invention is through the relation between zeeman laser gyro error dispersion and the temperature variation in sum; According to zeeman laser gyro common feature and individual difference; Set up chromatic dispersion control compensation model; Compensate because the error dispersion that resonator cavity temperature acute variation causes through the long working point of real-time control chamber; Thereby weaken greatly even eliminate all-solid state laser gyro zero transient process partially, having realized that the all-solid state laser gyro starts to improve simultaneously with performance fast improves, and has further expanded the application of this type gyro.
Claims (1)
1. a zeeman laser gyro chromatic dispersion control method is characterized in that, comprises the steps:
Step 1: offset frequency amount and frequency stabilization voltage are demarcated:
Calibration process is divided into static demarcating and dynamic calibration, and static demarcating is meant that gyro is in the certain environment temperature T
1Down, gyro and environment temperature realize thermal equilibrium, and the gyro start realizes steady operation, is no less than 10 minutes stabilization time, detect and obtain T
1The offset frequency amount of gyro is f under the temperature
B1With frequency stabilization voltage V
T1Change environment temperature to T
2, press similarity condition, detect and obtain T
2The offset frequency amount f of gyro under the temperature
B2With frequency stabilization voltage V
T2, demarcate choosing of environment temperature and be provided with respectively according to different property of gyroscopes and performance with the temperature step-length, by that analogy, realize offset frequency amount and frequency stabilization voltage static demarcating in the full temperature working range, set up offset frequency amount and functional relationship of temperature f
BT=F
1(T) and frequency stabilization voltage and functional relationship of temperature V
T=F
2(T);
The process of dynamic calibration and static demarcating process are basic identical, after difference is that each temperature spot reaches thermal equilibrium, and record frequency stabilization control voltage V
0, then gyro frequency stabilization control loop is in the open loop state of a control, voltage deviation Δ V is controlled in frequency stabilization, record offset frequency amount changing value is Δ f
b, the variation range of frequency stabilization voltage can be provided with respectively according to different property of gyroscopes and performance with change step, sets up offset frequency amount f
bRelation with frequency stabilization voltage variety Δ V, temperature T: Δ V=F
3(T, Δ f
b);
Static demarcating and dynamic calibration data are stored in the circuit controller with data form or function mode respectively;
Step 2: survey offset frequency amount and demodulation filtering:
Obtain initial temperature T, through the SIN/COS signal after the detection gyro light-to-current inversion, filtering noise separates extraneous input speed, obtains the offset frequency value f of gyro
B4, calculating needs the offset frequency amount Δ f of compensation
b=f
B4-f
BT
Step 3: chromatic dispersion control:
By V
T=F
2Frequency stabilization closed-loop control voltage when (T), obtaining temperature T is V
T, with the offset frequency value Δ f that obtains
bSubstitution function Δ V=F
3(T, Δ f
b) in, calculate corresponding frequency stabilization bias voltage Δ V by controller, provide frequency stabilization control voltage V=V
T-Δ V;
Step 4: the long assembly control in chamber:
Under the effect of frequency stabilization control voltage V, the long Control Component mirror reflection surface in chamber will advance or retreat, and micrometric displacement takes place; Reach and change the long purpose in gyro resonator cavity chamber; Through the long assembly of control chamber, realization is moved zeeman laser gyro working point, thereby realizes the compensation to the offset frequency amount;
Repeating step 2 is to step 4, up to Δ f
b=0 or Δ V=0, the frequency stabilization control loop changes closed-loop control over to, and dispersion compensation finishes.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994774A (en) * | 2013-12-16 | 2014-08-20 | 西安北方捷瑞光电科技有限公司 | Double-longitudinal mode frequency self-offset detection system and detection method of prism laser gyro |
| CN104713537A (en) * | 2013-12-11 | 2015-06-17 | 中国航空工业第六一八研究所 | Frequency stabilization control method for effectively enlarging temperature-variable frequency stabilization adjusting range of laser gyro |
| RU2685795C1 (en) * | 2018-08-10 | 2019-04-23 | Акционерное общество "Научно-исследовательский институт "Полюс" им. М.Ф. Стельмаха" | Method for compensation of slow meander effect on readings of laser gyroscope |
| RU2746847C1 (en) * | 2020-11-02 | 2021-04-21 | Акционерное общество "Научно-исследовательский институт "Полюс" им. М.Ф. Стельмаха" | Method for creating alternating frequency stand in zeeman laser gyroscope |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104713537A (en) * | 2013-12-11 | 2015-06-17 | 中国航空工业第六一八研究所 | Frequency stabilization control method for effectively enlarging temperature-variable frequency stabilization adjusting range of laser gyro |
| CN103994774A (en) * | 2013-12-16 | 2014-08-20 | 西安北方捷瑞光电科技有限公司 | Double-longitudinal mode frequency self-offset detection system and detection method of prism laser gyro |
| RU2685795C1 (en) * | 2018-08-10 | 2019-04-23 | Акционерное общество "Научно-исследовательский институт "Полюс" им. М.Ф. Стельмаха" | Method for compensation of slow meander effect on readings of laser gyroscope |
| RU2746847C1 (en) * | 2020-11-02 | 2021-04-21 | Акционерное общество "Научно-исследовательский институт "Полюс" им. М.Ф. Стельмаха" | Method for creating alternating frequency stand in zeeman laser gyroscope |
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