CN112710296B - Method and system for improving stability of output wavelength of laser by optical fiber gyroscope - Google Patents
Method and system for improving stability of output wavelength of laser by optical fiber gyroscope Download PDFInfo
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- CN112710296B CN112710296B CN202011483578.9A CN202011483578A CN112710296B CN 112710296 B CN112710296 B CN 112710296B CN 202011483578 A CN202011483578 A CN 202011483578A CN 112710296 B CN112710296 B CN 112710296B
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- 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
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Abstract
The invention relates to the technical field of optical fiber gyroscopes, and discloses an optical fiber gyroscope and a method for improving the stability of the output wavelength of a laser, which can improve the precision of the optical fiber gyroscope at low cost. The method comprises the following steps: detecting the temperature change around the laser; judging whether the wavelength change caused by the temperature change exceeds a set threshold value, if so, calculating a current adjustment proportionality coefficient or a power proportionality coefficient; adjusting the driving current of the laser by combining the current adjusting proportionality coefficient with the upper and lower current limits, or adjusting the duty ratio of the input electric power of the laser according to the power proportionality coefficient; and feeding back the current adjustment proportionality coefficient and the adjusted driving current value or the power proportionality coefficient and the adjustment parameter of the duty ratio of the laser input electric power to the functional units for regulating and controlling according to the light intensity change so as to avoid the misjudgment of each functional unit for regulating and controlling according to the light intensity change.
Description
Technical Field
The invention relates to the technical field of optical fiber gyroscopes, in particular to an optical fiber gyroscope and a method for improving stability of output wavelength of a laser.
Background
The low-precision gyroscope is generally designed by adopting a temperature open-loop laser, and the laser is internally provided with no temperature adjusting circuit, so that the system is low in complexity and low in cost. However, the laser resonant cavity expands with heat and contracts with cold with the change of temperature, thereby affecting the wavelength of the laser output by the laser.
The performance of the laser in the optical fiber gyroscope greatly affects the precision of the optical fiber gyroscope, and the laser is affected by the temperature, so that the laser can change due to the change of laser wavelength, and the precision of the optical fiber gyroscope is affected. At present, an electrothermal conversion circuit is generally added in a laser to ensure that the temperature of the laser is not influenced by the ambient temperature and the wavelength stability of output laser is improved, but the scheme system is complex and the laser is high in cost. Therefore, the research of a scheme capable of improving the stability of the output wavelength of the temperature open-loop laser to a certain extent has important significance.
Disclosure of Invention
The invention aims to disclose an optical fiber gyroscope and a method for improving the stability of the output wavelength of a laser, which can improve the precision of the optical fiber gyroscope at low cost.
In order to achieve the above object, the present invention discloses a method for improving the stability of the output wavelength of a laser by an optical fiber gyroscope, which comprises:
detecting the temperature change around the laser;
judging whether the wavelength change caused by the temperature change exceeds a set threshold value, if so, calculating a current adjustment proportionality coefficient or a power proportionality coefficient;
adjusting the driving current of the laser by combining the current adjusting proportionality coefficient with the upper and lower current limits, or adjusting the duty ratio of the input electric power of the laser according to the power proportionality coefficient;
and feeding back the current regulation proportionality coefficient and the regulated driving current value or the power proportionality coefficient and the regulation parameter of the duty ratio of the laser input electric power to the functional units for regulation according to the light intensity change so as to avoid the misjudgment of each functional unit for regulation according to the light intensity change.
In the invention, the functional unit for regulating and controlling according to the light intensity change comprises a light detection compensation unit. Correspondingly, the method further comprises the following steps:
and when judging whether the angular speed changes according to the light intensity change, the optical detection compensation unit cancels the interference caused by adjusting the driving current of the laser according to the current adjustment proportionality coefficient and the adjusted driving current value or according to the power proportionality coefficient and the adjustment parameter of the duty ratio of the input electric power of the laser.
Preferably, in the present invention, the thermal relationship between the laser core temperature and the ambient temperature is:
T J ＝R JA *P+T A
wherein, T J Is the core temperature, R, of the laser JA Is the power thermal resistance between the laser core and the ambient temperature, P is the input power that the laser can adjust, T A Is the temperature of the environment in which the laser is located.
Preferably, the present invention can calculate the duty ratio in the following manner:
if the power of the laser is P1 when the laser is in high-brightness output, the power is P2 when the laser is in low-brightness output, the period T is T, the power of the original laser is P, and the adjusted power is K 2 P; then:
K 2 P＝TH 2 *P1+TL 2 *P2
TH 2 +TL 2 ＝T
wherein, TH 2 Period of high brightness, TL 2 For the low brightness time period, the following are calculated:
preferably, the current adjustment scaling factor is calculated in the following manner in the present embodiment:
acquiring a laser output reference current value;
confirming whether the wavelength change exceeds a set threshold value according to the wavelength-temperature corresponding relation in the laser thermal model, if so, confirming the change according to the laser inner core temperature T J Calculating the current adjustment proportionality coefficient K 1 ：
K 1 ＝(T J Reference temperature for reference current value)/(T J + laser current ambient temperature)
The adjusted theoretical driving current value is taken as a reference current value and a proportionality coefficient K 1 The product of the two.
Furthermore, the method of the invention also compares the calculated theoretical driving current value with the upper limit and the lower limit of the driving current, and if the upper limit is exceeded, the actual adjustment is carried out according to the upper limit of the driving current; if the current exceeds the lower limit, the actual adjustment is carried out according to the lower limit of the driving current; and if the current value is between the upper limit and the lower limit, the actual adjustment is carried out according to the adjustment of the theoretical driving current value.
In order to achieve the above object, the present invention further discloses a system for improving the output wavelength stability of a laser by using an optical fiber gyroscope, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the above method when executing the computer program.
The invention has the following beneficial effects:
simple and practical. Although the effect of the temperature closed-loop fiber optic gyroscope cannot be completely achieved, the precision of the temperature open-loop fiber optic gyroscope can be partially improved greatly.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a system block diagram of an optical fiber gyro according to an embodiment of the present invention.
FIG. 2 is a schematic flow chart of the method of example 1 of the present invention.
Fig. 3 is yet another variation representation of the method flow shown in fig. 2.
FIG. 4 is a schematic diagram of a circuit structure of a part of the temperature detection functional unit according to the embodiment of the present invention.
FIG. 5 is a schematic flow chart of the method of embodiment 2 of the present invention.
Fig. 6 is yet another alternate representation of the method flow shown in fig. 5.
Fig. 7 is a schematic diagram of the periodicity of the duty cycle calculation in embodiment 2 of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Example 1
The embodiment discloses a method for improving the stability of the output wavelength of a laser by an optical fiber gyroscope. The system architecture of the optical fiber gyroscope is shown in fig. 1, and a temperature detection functional unit is added on the basis of a traditional optical fiber gyroscope system.
As shown in fig. 2 and fig. 3, the method of the present embodiment includes:
and S1, detecting the temperature change around the laser.
In this step, the temperature detecting functional unit may adopt a circuit structure as shown in fig. 4, specifically use a commonly used NTC resistor for temperature detection, and convert the temperature change into a change of an analog electrical signal; the temperature analog electric signal obtained by the temperature detection unit is then converted into a digital signal by AD conversion for subsequent processing.
And S2, judging whether the wavelength change caused by the temperature change exceeds a set threshold value or not, and if so, calculating a current adjustment proportionality coefficient.
In this step, as an example, the set threshold includes, but is not limited to: confirming whether the wavelength change threshold exceeds 1% according to the wavelength-temperature corresponding relation in the laser thermal model, and starting an adjusting process if the wavelength change threshold exceeds 1%; if not, the regulation process is not started.
Preferably, in the specific calculation process of this step, the thermal relationship between the laser core temperature and the ambient temperature is as follows:
T J ＝R JA *P+T A
wherein, T J Is the core temperature, R, of the laser JA Is the power thermal resistance between the laser core and the ambient temperature, P is the input power that the laser can adjust, T A Is the temperature of the environment in which the laser is located.
Optionally, the step calculates the current adjustment scaling factor in the following manner:
acquiring a laser output reference current value;
confirming whether the wavelength change exceeds a set threshold value according to the wavelength-temperature corresponding relation in the laser thermal model, if so, confirming the change according to the laser inner core temperature T J Calculating the current adjustment proportionality coefficient K 1 ：
K 1 ＝(T J Reference temperature for reference current value)/(T J + laser current ambient temperature)
The adjusted theoretical driving current value is taken as a reference current value and a proportionality coefficient K 1 The product of the two.
The specific calculation process is exemplified as follows:
suppose that: the laser output reference current I uses a laser drive current value at 20 degrees as a reference value. The target of the temperature adjustment of the internal cavity of the laser is also adjusted according to the cavity temperature at the ambient temperature of 20 ℃.
When the temperature detection unit detects that the ambient temperature is-10 ℃, firstly, whether the wavelength change threshold exceeds 1% is confirmed according to the wavelength-temperature corresponding relation in the laser thermal model, if the wavelength change threshold exceeds 1%, the adjustment process is started, and the adjustment process is not started.
When the wavelength changes by more than 1%, the current adjustment proportionality coefficient K is carried out according to the following formula 1 Is calculated by
P 20 ＝(T J -20)/R JA
P -10 ＝(T J +10)/R JA
K 1 ＝P 20 /P -10
Target laser core temperature T J Is the same, T results from the intrinsic cavity-to-ambient thermal resistance of some lasers being too small J Low temperature, T J The lower the temperature, the smaller the adjustment range of the scheme is, so that the thermal resistance can be improved on the laser by adding a heat insulating material, and the adjustment range of the embodiment is improved.
Calculated as follows: k 1 ＝(T J -20)/(T J +10)。
According to T at 20 degrees stored in the laser thermal model J Value, calculating coefficient K 1 Then calculating the adjusted driving current value I -10 ＝K 1 *I 20 。
And S3, adjusting the driving current of the laser by combining the current adjustment proportionality coefficient with the upper and lower current limits.
Preferably, in this step, the calculated theoretical driving current value is compared with the upper and lower limits of the driving current, and if the calculated theoretical driving current value exceeds the upper limit, actual adjustment is performed according to the upper limit of the driving current; if the current exceeds the lower limit, the actual adjustment is carried out according to the lower limit of the driving current; and if the current value is between the upper limit and the lower limit, the actual adjustment is carried out according to the adjustment of the theoretical driving current value.
And S4, feeding back the current adjustment proportionality coefficient and the adjusted driving current value to the functional units for regulation and control according to light intensity change so as to avoid misjudgment of each functional unit for regulation and control according to light intensity change.
In this step, the functional unit for performing regulation according to the light intensity change includes an optical detection compensation unit, and when the optical detection compensation unit determines whether the angular velocity change occurs according to the light intensity change, the interference caused by adjusting the driving current of the laser is cancelled according to the current adjustment proportionality coefficient and the adjusted driving current value.
Example 2
The present embodiment discloses a method for improving the stability of the output wavelength of a laser corresponding to the optical fiber gyroscope shown in fig. 1, as shown in fig. 5 and fig. 6, including:
and S11, detecting the temperature change around the laser.
This step is the step S1 described above, and will not be described in detail.
And S12, judging whether the wavelength change caused by the temperature change exceeds a set threshold value or not, and if so, calculating an electric power proportional coefficient.
In this step, the setting of the specific threshold refers to step S2, which is not described in detail.
And S13, adjusting the duty ratio of the input electric power of the laser according to the power proportion coefficient.
Preferably, as shown in fig. 7, the method for calculating the electric power proportionality coefficient and the duty ratio of the present embodiment is as follows:
if the power of the laser is P1 when the laser is output at high brightness, P2 when the laser is output at low brightness, the period T, the original laser power P, and the adjusted power K 2 P，K 2 Is the power scaling factor; then:
K 2 P＝TH 2 *P1+TL 2 *P2
TH 2 +TL 2 ＝T
wherein TH is 2 Time period for high brightness, TL 2 For the low brightness time period, the following are calculated:
and S14, feeding back the power proportion coefficient and the adjustment parameter of the duty ratio of the input electric power of the laser to the functional units for regulation according to the light intensity change so as to avoid misjudgment of each functional unit for regulation according to the light intensity change.
In this step, the function unit for performing regulation according to the light intensity variation includes a light detection compensation unit. Correspondingly, when the light detection compensation unit judges whether the angular speed changes according to the light intensity change, the interference caused by adjusting the driving current of the laser is counteracted according to the power proportionality coefficient and the adjustment parameter of the duty ratio of the input electric power of the laser.
Example 3
Corresponding to the above embodiments 1 and 2, the present embodiment discloses a system for improving the output wavelength stability of a laser by an optical fiber gyroscope, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method when executing the computer program.
In summary, the method and system for improving the stability of the output wavelength of the laser by the optical fiber gyroscope disclosed in the above embodiments of the present invention at least have the following beneficial effects:
simple and practical. Although the effect of the temperature closed-loop fiber optic gyroscope cannot be completely achieved, the precision of the temperature open-loop fiber optic gyroscope can be partially improved greatly.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for improving the stability of the output wavelength of a laser by an optical fiber gyroscope is characterized by comprising the following steps:
detecting the temperature change around the laser;
judging whether the wavelength change caused by the temperature change exceeds a set threshold value, and if so, calculating a current adjustment proportionality coefficient or a power proportionality coefficient;
adjusting the driving current of the laser by combining the current adjusting proportionality coefficient with the upper and lower current limits, or adjusting the duty ratio of the input electric power of the laser according to the power proportionality coefficient;
feeding back the current regulation proportionality coefficient and the regulated driving current value or the power proportionality coefficient and the regulation parameter of the duty ratio of the laser input electric power to the functional units for regulation according to the light intensity change so as to avoid the misjudgment of each functional unit for regulation according to the light intensity change;
the thermal relationship between the laser core temperature and the ambient temperature is as follows:
T J ＝R JA *P+T A
wherein, T J Is the core temperature, R, of the laser JA Is the power thermal resistance of the laser kernel and the ambient temperature, P is the input power which can be adjusted by the laser, T A Is the temperature of the environment in which the laser is located.
2. The method of claim 1, wherein the functional unit that is adjusted and controlled according to the light intensity variation comprises a light detection compensation unit, and the method further comprises:
and when judging whether the angular speed changes according to the light intensity change, the light detection compensation unit cancels the interference caused by adjusting the driving current of the laser according to the current adjustment proportionality coefficient and the adjusted driving current value or according to the power proportionality coefficient and the adjustment parameter of the duty ratio of the input electric power of the laser.
3. Method according to claim 1 or 2, characterized in that the calculation of the duty cycle is performed in the following way:
power of laser if laser is high brightness outputP1, the power at low brightness output is P2, the period T, the original laser power is P, and the adjusted power is K 2 P，K 2 Is the power scaling factor; then:
K 2 P＝TH 2 *P1+TL 2 *P2
TH 2 +TL 2 ＝T
wherein TH is 2 Time period for high brightness, TL 2 For the low brightness time period, the following are calculated:
4. a method according to claim 1 or 2, characterized in that the current adjustment scaling factor is calculated as follows:
acquiring a laser output reference current value;
confirming whether the wavelength change exceeds a set threshold value according to the wavelength-temperature corresponding relation in the laser thermal model, if so, confirming the change according to the laser inner core temperature T J Calculating the current adjustment proportionality coefficient K 1 ：
K 1 ＝(T J Reference temperature for reference current value)/(T J + laser current ambient temperature)
The adjusted theoretical driving current value is taken as a reference current value and a proportionality coefficient K 1 The product of the two.
5. The method of claim 4, further comprising:
comparing the calculated theoretical drive current value with the upper limit and the lower limit of the drive current, and if the upper limit is exceeded, actually adjusting according to the upper limit of the drive current; if the current exceeds the lower limit, the actual adjustment is carried out according to the lower limit of the driving current; and if the current value is between the upper limit and the lower limit, the actual adjustment is carried out according to the adjustment of the theoretical driving current value.
6. A system for improving the output wavelength stability of a laser by an optical fiber gyroscope, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method of any one of the preceding claims 1 to 5 when executing the computer program.
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| US7242701B2 (en) * | 2005-02-15 | 2007-07-10 | Lucent Technologies Inc. | Laser wavelength control arrangement and method |
| CN100452580C (en) * | 2007-02-09 | 2009-01-14 | 中国科学院上海光学精密机械研究所 | Device for stabling semiconductor laser operation wavelength |
| CN101833344B (en) * | 2010-04-27 | 2012-08-22 | 青岛海信电器股份有限公司 | Temperature control device and method for laser display light source and laser display device |
| CN102761052A (en) * | 2012-07-31 | 2012-10-31 | 青岛海信宽带多媒体技术有限公司 | Optical module working parameter adjusting method and adjusting device |
| CN103872569B (en) * | 2014-03-27 | 2017-01-04 | 中航捷锐（北京）光电技术有限公司 | Stablize Er-Doped superfluorescent fiber source wavelength and the method for power, device and corresponding light source |
| CN107543537B (en) * | 2017-07-10 | 2019-12-20 | 北京控制工程研究所 | Method for improving scale factor stability of fiber-optic gyroscope |
| CN110030987A (en) * | 2019-03-21 | 2019-07-19 | 中国船舶重工集团公司第七0七研究所 | A kind of high-power Gaussian spectrum ASE light source of fibre optic gyroscope |
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