CN113916211A - A Passive Laser Gyroscope Based on Critically Coupled Ring Cavity - Google Patents
A Passive Laser Gyroscope Based on Critically Coupled Ring Cavity Download PDFInfo
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- G—PHYSICS
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- 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
- G01C19/727—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 using a passive ring resonator
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- 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
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Abstract
本发明公开了一种基于临界耦合环形腔的被动式激光陀螺仪，其特征在于，包括激光系统、临界耦合环形腔以及信号采集系统，其中，激光系统用于向临界耦合环形腔注入第一激光和第二激光；临界耦合环形腔用于接收第一激光和第二激光并使与临界耦合环形腔共振的载波完全进入腔内、且使边带反射于腔外；信号采集系统用于采集经由临界耦合环形腔的第一激光和第二激光。与临界耦合环形腔共振的载波不会被环形腔反射，而不共振的边带则会被反射，所以共振激光不会在环形腔的反射端与边带发生干涉，从而不受RAM效应的影响。
The invention discloses a passive laser gyroscope based on a critically coupled annular cavity, which is characterized by comprising a laser system, a critically coupled annular cavity and a signal acquisition system, wherein the laser system is used for injecting first laser and The second laser; the critically coupled ring cavity is used to receive the first laser and the second laser and make the carrier resonating with the critically coupled ring cavity completely enter the cavity, and the sidebands are reflected outside the cavity; the signal acquisition system is used to collect the The first laser and the second laser of the ring cavity are coupled. The carrier resonating with the critically coupled ring cavity will not be reflected by the ring cavity, and the non-resonant sideband will be reflected, so the resonant laser will not interfere with the sideband at the reflection end of the ring cavity, so it is not affected by the RAM effect .
Description
Technical Field
The invention belongs to the field of laser gyroscopes, and particularly relates to a passive laser gyroscope based on a critical coupling ring cavity.
Background
The laser gyroscope has excellent rotation rate measurement performance and is widely applied to the fields of inertial navigation, geophysical and basic physics research and the like. A laser gyroscope is a rotation sensor based on the Sagnac Effect. The Sagnac (Sagnac) effect is that two beams of same-source light are made to propagate in a ring-shaped optical cavity in clockwise and counterclockwise directions, respectively, if the ring-shaped cavity rotates in an optical plane, small differences exist between propagation optical paths in the clockwise direction and the counterclockwise direction, and the small optical path differences cause slight differences between resonance frequencies of two beams of light in the clockwise direction and the counterclockwise direction in the ring-shaped cavity, and the Frequency difference is called as the Sagnac Frequency (Sagnac Frequency), and the Sagnac Frequency f is the same as the Sagnac FrequencysSatisfies the following conditions:
wherein f issThe sagnac frequency is shown, omega is the rotation angular velocity of the optical plane where the ring cavity is located, lambda is the wavelength of the laser, A is the surrounding area of the ring cavity, and P is the surrounding perimeter of the ring cavity. As long as the Sagnac frequency is measured, the current rotation angular velocity of the reference system where the laser gyroscope is located can be calculated.
There is no gain medium inside the passive laser gyroscope optical cavity, and two laser beams need to be respectively locked to the resonance modes in the clockwise direction and the anticlockwise direction in an external injection mode, and the frequency difference between the two laser beams at this time contains the sagnac frequency. In order to lock the external laser light to the resonance peak of the ring cavity, passive laser gyroscopes generally employ a Pound-Drever-hall (pdh) frequency-locking technique. Ideally, according to the PDH frequency locking technique, a carrier and two sidebands with opposite phases and equal amplitudes are generated after laser is phase-modulated by an electro-optical modulator (EOM), and the laser with three components enters an electro-optical detector after being reflected by a ring cavity to obtain a reflected signal. And demodulating the reflected signal by using the local signal to obtain an error signal required by laser frequency locking. In practical cases, the two sidebands are not exactly opposite in phase and not exactly equal in amplitude due to imperfections in the phase modulationThe degrees are not exactly equal, resulting in the mixing of the amplitude modulated signal, i.e. the Residual Amplitude Modulation (RAM), into the modulated signal. Such an amplitude modulated signal is indistinguishable from the error signal during frequency locking, and therefore there is usually a varying voltage offset V in the final demodulated error signalRAMAnd the laser locking frequency in the ring cavity determined according to the error signal generates offset, so that the stability of the sagnac frequency measurement is influenced.
Disclosure of Invention
In view of the above drawbacks or needs for improvement in the prior art, the present invention provides a passive laser gyroscope based on a critically coupled ring cavity, which aims to improve the stability of sagnac frequency measurement.
To achieve the above object, according to one aspect of the present invention, there is provided a passive laser gyroscope based on a critically coupled ring cavity, comprising a laser system (100), a critically coupled ring cavity (200), and a signal acquisition system (300), wherein,
the laser system (100) is used for injecting a first laser and a second laser into the critical coupling ring cavity (200);
the critical coupling ring cavity (200) is used for receiving the first laser and the second laser, enabling a carrier wave which is in resonance with the critical coupling ring cavity (200) to completely enter the cavity, and enabling a sideband to be reflected outside the cavity;
the signal acquisition system (300) is configured to acquire the first laser light and the second laser light via the critically coupled ring cavity (200).
Preferably, the critical coupling ring cavity comprises an input mirror (201), a first mirror (202), a second mirror (203) and an output mirror (204), sidebands of the first laser light and the second laser light are reflected outside the cavity by the input mirror (201), and carriers of the first laser light and the second laser light, which resonate with the critical coupling ring cavity (200), penetrate through the input mirror (201) to enter the critical coupling ring cavity (200) and penetrate through the output mirror (204) to enter the signal acquisition system (300) after being reflected to the output mirror (204) by the first mirror (202) and the second mirror (203), respectively.
Preferably, the impedance matching coefficient kappa and the laser mode matching efficiency p of the critical coupling ring cavity (200) satisfy
The impedance matching coefficient
Wherein L is1Is the absorption scattering loss of the input mirror (201), r1、r2、r3、r4The reflection coefficients of the input mirror (201), the first mirror (202), the second mirror (203) and the output mirror (204), respectively.
Preferably, the transmittance of the input mirror (201) in the critically coupled ring cavity (200) is greater than or equal to the sum of the transmittances of the first mirror (202), the second mirror (203) and the output mirror (204).
Preferably, the first laser light and the second laser light penetrate through the input mirror (201) into the critical coupling ring cavity (200) in different directions, the first laser light propagates in the critical coupling ring cavity (200) in a clockwise direction, and the second laser light propagates in the critical coupling ring cavity (200) in a counterclockwise direction, respectively.
Preferably, emission directions of the first laser light and the second laser light output through the output mirror (204) are perpendicular to each other.
Preferably, the laser system (100) comprises a laser source (101) and a frequency locking system (102), the frequency locking system (102) being configured to lock the first laser light and the second laser light onto two adjacent or two same longitudinal modes of a critically coupled ring cavity (200).
Preferably, the laser source (101) comprises a narrow linewidth solid state laser or a semiconductor laser.
Preferably, the signal acquisition system comprises a beat frequency optical path, a photodetector (306) and a frequency counter (307), the first laser and the second laser form a beat frequency signal through the beat frequency optical path and are received by the photodetector (306), and the frequency counter (307) is connected with the photodetector (306) and is used for calculating the beat frequency signal frequency of the beat frequency signal.
Preferably, the beat frequency optical path includes a third reflector (303), a fourth reflector (304), and a half mirror (305), the first laser light is reflected to the front of the half mirror (305) through the third reflector (303), the second laser light is reflected to the back of the half mirror (305) through the fourth reflector (304), and the first laser light and the second laser light form the beat frequency signal after passing through the half mirror (305).
The applicant has found that the reason for the offset of the error signal is that when the laser enters the ring cavity, in addition to the sidebands, part of the carrier is reflected, and the two sidebands with incompletely opposite phases of the reflected carrier interfere with each other, which causes the offset of the error signal demodulated by the frequency locking system according to the reflected signal, and finally causes the offset of the locking point.
In this application, because the carrier wave with critical coupling ring cavity resonance can not be reflected by the annular chamber receiving end when getting into the annular chamber, so two not totally opposite sidebands of phase place that are reflected back can not take place to interfere with the carrier wave, consequently even the phase place of two sidebands is not totally opposite, the value of error signal at laser locking frequency point that can not influence demodulation yet, thereby the error signal that frequency locking system modulated has been avoided appearing the offset, then the skew of frequency locking point has been avoided, RAM noise has been reduced, the rotation detection performance of passive form laser gyroscope has been improved.
Drawings
FIG. 1 is a general block diagram of a passive laser gyroscope based on a critically coupled ring cavity according to an embodiment of the present invention;
FIG. 2 shows the transformation coefficients of different impedance matching coefficients κ
And (3) a graph of the efficiency ρ matched to the laser mode.
Throughout the drawings, the same reference numerals are used to designate the same elements or structures, and the reference numerals are as follows:
the laser system 100, the laser source 101, the frequency locking system 102, the critical coupling ring cavity 200, the input mirror 201, the first mirror 202, the second mirror 203, the output mirror 204, the signal acquisition system 300, the first laser 301, the second laser 302, the third mirror 303, the fourth mirror 304, the half mirror 305, the photodetector 306, and the frequency counter 307.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, in an embodiment, a passive laser gyroscope based on a critical coupling ring cavity includes a laser system 100, a critical coupling ring cavity 200, and a signal acquisition system 300, wherein the laser system 100 is configured to inject a first laser and a second laser into the critical coupling ring cavity 200; the critical coupling ring cavity 200 is used for receiving the first laser and the second laser, enabling a carrier wave which resonates with the critical coupling ring cavity 200 to enter the cavity, and enabling a sideband to be reflected outside the cavity; the signal acquisition system 300 is used to acquire the first laser light 301 and the second laser light 302 via the critically coupled ring cavity 200. The sagnac frequency is calculated based on the laser signal acquired by the signal acquisition system 300.
In this application, apply critical coupling cavity theory to passive form laser gyroscope, make the annular chamber be in critical coupling state, namely, make the carrier wave with critical coupling annular chamber resonance not take place to reflect and get into the intracavity completely, and the sideband is then reflected back by the annular chamber, so the carrier wave with cavity resonance can not take place to interfere with the sideband that reflects back this moment, thereby do not receive the influence of RAM effect, also insensitive to the RAM effect, effectively restrained the skew that the RAM effect that is introduced by PDH frequency locking system caused laser locking frequency, RAM noise has been reduced, the rotation detection performance of passive form laser gyroscope has been improved.
In one embodiment, the impedance matching coefficient κ and the laser mode matching efficiency ρ of the critically coupled ring cavity 200 satisfy
The impedance matching coefficient of the optical cavity describes the reflection characteristic of the cavity to laser, and when the reflection of the laser injected into the cavity is zero, the impedance matching is called; the laser mode matching efficiency represents the matching degree of the spatial transverse mode and the cavity eigenmode of the incident laser, and is equal to the ratio of the cavity laser power to the total incident laser power.
In a passive laser gyroscope, the laser locking frequency shift caused by the RAM effect can be expressed by the following equation:
wherein f isRAMFor the shift of the laser locking frequency, VRAMVoltage bias introduced for RAM effect.
The conversion relation between the two is a function of an optical cavity impedance matching coefficient k and a laser mode matching efficiency p, and S is a frequency discrimination slope of a PDH system and is a constant. When the impedance matching coefficient kappa and the laser mode matching efficiency rho of the critical coupling ring cavity 200 satisfy
When the temperature of the water is higher than the set temperature,
the optical cavity reaches the critical coupling state, and the voltage bias V introduced by the RAM effectRAMInfluence on laser locking frequency fRAMIs reduced toAnd (4) zero. FIG. 2 shows the transformation coefficients of different impedance matching coefficients κ
The relationship with the lasing mode matching efficiency ρ is that in practice the lasing mode matching efficiency ρ of the critical coupling ring cavity 200 cannot be equal to or greater than 1, i.e., ρ is the only thing that can be done<1, corresponding, optical cavity impedance matching coefficient κ<0, i.e. only when the impedance matching coefficient of the ring cavity is κ<When 0, can make
Complete suppression of the RAM effect is achieved.
In one embodiment, as shown in FIG. 1, the critically coupled ring cavity 200 comprises an input mirror 201, a first mirror 202, a second mirror 203, and an output mirror 204. Sidebands of the first laser light and the second laser light are reflected outside the cavity by the input mirror 201; the carriers of the first laser light and the second laser light that resonate with the critical coupling ring cavity 200 completely penetrate through the input mirror 201 into the critical coupling ring cavity 200. The first laser light entering the critical coupling ring cavity 200 is reflected to the output mirror 204 by the first mirror 202 and penetrates through the output mirror 204 to enter the signal acquisition system 300; the second laser light entering the critical coupling ring cavity 200 is reflected by the second mirror 203 to the output mirror 204 and penetrates the output mirror 204 to enter the signal acquisition system 300.
Further, the impedance matching coefficient of the critically coupled ring cavity 200
Wherein L is1The absorption scattering loss of the input mirror 201, r1、r2、r3、r4The reflection coefficients of the input mirror 201, the first mirror 202, the second mirror 203 and the output mirror 204, respectively. When the reflection coefficients of the first mirror 202, the second mirror 203 and the output mirror 204 are all r, the impedance matching systemNumber of
In this embodiment, the impedance matching coefficient κ and the laser mode matching efficiency ρ are satisfied by adjusting the optical characteristics of the optical path and the cavity mirror
The ring cavity can be brought to the critical coupling state described above.
In one embodiment, the transmission loss of the input mirror 201 in the critically coupled ring cavity 200 is greater than or equal to the sum of the remaining losses of the ring cavity, i.e., the
Wherein t is1Is the transmission coefficient of the input mirror, LtotalThe sum of losses of the ring cavity includes transmission loss and absorption scattering loss of the input mirror, the first mirror, the second mirror and the output mirror. In the present embodiment, the impedance matching coefficient κ of the ring cavity can be made only if the transmission coefficient of the input mirror 201 satisfies the above relationship<0, thereby enabling
Complete suppression of the RAM effect is achieved.
In an embodiment, the first laser light and the second laser light penetrate through the input mirror 201 into the critical coupling ring cavity 200 in different directions, the first laser light propagates in the critical coupling ring cavity 200 in a clockwise direction, and the second laser light propagates in the critical coupling ring cavity 200 in a counterclockwise direction, respectively. Further, the emission directions of the first laser light 301 and the second laser light 302 outputted through the output mirror 204 are perpendicular to each other.
In an embodiment, the laser system 100 comprises a laser source 101 and a frequency locking system 102, the frequency locking system 102 is used for locking the first laser and the second laser to two critical coupling ring cavities 200Adjacent or on two identical longitudinal modes. In a specific embodiment, the first laser and the second laser separated from the laser system can be locked on the adjacent longitudinal modes of the critical coupling ring cavity 200, and the frequencies are respectively f1And f2The frequency relation of which satisfies f1-f2＝fs+N·fFRSWherein f issIs the Sagnac frequency, fFRSIs one time free spectral region frequency of the annular optical cavity and satisfies the relation
Where c is the speed of light in vacuum, P is the perimeter of the annular optical cavity, and N is an integer. In another specific embodiment, the first laser and the second laser separated from the laser system can be locked on the same longitudinal mode of the critically coupled ring cavity 200, i.e. N is 0, and the frequency relation satisfies f1-f2＝fsWherein f issIs the sagnac frequency. Preferably, all the laser light is from a narrow linewidth solid state laser or a semiconductor laser.
In an embodiment, the signal acquisition system 300 includes a beat frequency optical path, a photodetector 306, and a frequency counter 307, where the first laser light 301 and the second laser light 302 form a beat frequency signal through the beat frequency optical path and are received by the photodetector 306, and the frequency counter 307 is connected to the photodetector 306 and is configured to calculate a beat frequency signal frequency of the beat frequency signal and then calculate a sagnac frequency according to the beat frequency signal frequency.
Specifically, the beat frequency optical path includes a third reflector 303, a fourth reflector 304, and a half mirror 305, where the first laser light 301 is reflected by the third reflector 303 to the front of the half mirror 305, the second laser light 302 is reflected by the third reflector 303 to the back of the half mirror 305, and the first laser light 301 and the second laser light 302 form the beat frequency signal after passing through the half mirror 305.
In specific operation, a cavity mirror with proper reflectivity can be selected to make the impedance matching coefficient kappa of the ring cavity negative, and then the impedance matching coefficient kappa is calculated according to a formula
And calculating to obtain the required mode matching efficiency rho, and then adjusting the mode matching efficiency by adjusting the optical path in front of the cavity to obtain the required mode matching efficiency value. In the present application, the mode matching efficiency of the laser does not need to be adjusted to be close to 100%, and may be 60% to 80%, as long as the requirement is satisfied
That is, a specific mode matching efficiency can be achieved by adjusting the cavity front optical path.
For example, in one particular embodiment, the reflectivity of the input mirror
Absorption scattering loss L1The reflectivities of the first mirror 202, the second mirror 203, and the output mirror are all R-R, 10ppm20.99996, the impedance matching coefficient of the critical coupling ring cavity is calculated as
According to the formula
The corresponding laser mode matching efficiency was 65.71%, at which time,
effectively inhibiting the deviation of the RAM effect introduced by the PDH frequency locking system to the laser locking frequency. If the two injection lasers 103 and 104 are locked to two adjacent longitudinal modes of the critical coupling ring cavity 200 under the action of the PDH frequency locking system 102, that is, if N is 1, the frequency relationship satisfies f1-f2＝fs+fFRSWherein, the frequencies f of the first laser and the second laser collected by the signal collection system 300 are respectivelysIs the Sagnac frequency, fFRSOne free spectral range frequency of the critically coupled ring cavity. The first laser light and the second laser light exit from the output mirror 204 of the critically coupled ring cavity 200The direction of the emitted light is vertical to each other, a beat frequency light path is formed by the two reflectors 303 and 304 and the semi-transparent and semi-reflective mirror 305, a beat frequency signal is received by the photoelectric detector 306, and the frequency f of the beat frequency signal can be read out from the frequency counter 307beatSatisfies the relationship fbeat＝fs+fFRSFrom this, the Sagnac frequency f is calculateds。
In another specific embodiment, the input mirror has a reflectivity
Absorption scattering loss L1100ppm, the reflectivities of the first, second and output mirrors are all R20.99999, the impedance matching coefficient of the critical coupling ring cavity is calculated to be
According to the formula
The corresponding laser mode matching efficiency was 75.75%. At this time, the process of the present invention,
effectively inhibiting the deviation of the RAM effect introduced by the PDH frequency locking system to the laser locking frequency. If the two injected lasers 103 and 104 are injected into the critically coupled ring cavity 200 from two directions of the input mirror 201, they propagate in the cavity in clockwise and counterclockwise directions, respectively. The two injection lasers 103 and 104 are locked to the same longitudinal mode of the critical coupling ring cavity 200 under the action of the PDH frequency locking system 102, that is, N is 0, and the frequency relationship thereof satisfies f1-f2＝fsWherein f issIs the sagnac frequency. Two beams of emergent lasers 301 and 302 in the signal acquisition system 300 are emergent from the output mirror 204 of the critical coupling ring cavity 200 in directions perpendicular to each other, and form a beat frequency optical path with two reflectors 303 and 304 and a semi-transparent and semi-reflective mirror 305, and beat frequency signals are received by a photoelectric detector 306, and the frequency f of the beat frequency signals can be read out from a frequency counter 307beatSatisfies the relationship fbeat＝fsFrom this, the Sagnac frequency f is deriveds。
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A passive laser gyroscope based on a critical coupling ring cavity is characterized by comprising a laser system (100), a critical coupling ring cavity (200) and a signal acquisition system (300), wherein,
the laser system (100) is used for injecting a first laser and a second laser which are emitted along different directions into the critical coupling ring cavity (200);
the critical coupling ring cavity (200) is used for receiving the first laser and the second laser, enabling a carrier which resonates with the critical coupling ring cavity (200) to completely enter the cavity, enabling a sideband to be reflected outside the cavity, and enabling the first laser and the second laser which enter the critical coupling ring cavity (200) to be incident to the signal acquisition system (300) after being reflected;
the signal acquisition system (300) is used for acquiring and analyzing the first laser light and the second laser light emitted through the critical coupling ring cavity (200).
2. The passive laser gyroscope of claim 1, characterized in that the critically coupled annular cavity comprises an input mirror (201), a first mirror (202), a second mirror (203), and an output mirror (204), sidebands of the first laser light and the second laser light are reflected outside the cavity by the input mirror (201), and carriers of the first laser light and the second laser light that resonate with the critically coupled annular cavity (200) completely penetrate through the input mirror (201) into the critically coupled annular cavity (200) and penetrate through the output mirror (204) into the signal acquisition system (300) after being reflected to the output mirror (204) by the first mirror (202) and the second mirror (203), respectively.
3. The passive laser gyroscope of claim 2, characterized in that the impedance matching coefficient κ and the laser mode matching efficiency ρ of the critically coupled ring cavity (200) satisfy
The impedance matching coefficient
Wherein L is1Is the absorption scattering loss of the input mirror (201), r1、r2、r3、r4The reflection coefficients of the input mirror (201), the first mirror (202), the second mirror (203) and the output mirror (204), respectively.
4. The passive laser gyroscope of claim 2, characterized in that the transmittance of the input mirror (201) in the critically coupled ring cavity (200) is greater than or equal to the sum of the transmittances of the first mirror (202), the second mirror (203) and the output mirror (204).
5. The passive laser gyroscope of claim 2, characterized in that the first laser light and the second laser light each penetrate the input mirror (201) into the critically coupled ring cavity (200) in different directions, the first laser light propagating in the critically coupled ring cavity (200) in a clockwise direction and the second laser light propagating in the critically coupled ring cavity (200) in a counter-clockwise direction.
6. The passive laser gyro of claim 5, characterized in that the emission directions of the first laser light and the second laser light output through the output mirror (204) are perpendicular to each other.
7. The passive laser gyroscope of claim 1, characterized in that the laser system (100) comprises a laser source (101) and a frequency locking system (102), the frequency locking system (102) being configured to lock the first laser light and the second laser light onto two adjacent or two identical longitudinal modes of the critically coupled ring cavity (200).
8. The passive laser gyroscope of claim 1, characterized in that the laser source (101) comprises a narrow linewidth solid-state laser or a semiconductor laser.
9. The passive laser gyroscope of claim 1, wherein the signal acquisition system (300) comprises a beat frequency optical path, a photodetector (306), and a frequency counter (307), the first laser light and the second laser light forming a beat frequency signal via the beat frequency optical path being received by the photodetector (306), the frequency counter (307) being connected to the photodetector (306) for calculating a beat frequency signal frequency of the beat frequency signal.
10. The passive laser gyroscope according to claim 9, wherein the beat frequency optical path includes a third mirror (303), a fourth mirror (304), and a half mirror (305), the first laser light is reflected by the third mirror (303) to the front surface of the half mirror (305), the second laser light is reflected by the fourth mirror (304) to the back surface of the half mirror (305), and the first laser light and the second laser light form the beat frequency signal after passing through the half mirror (305).
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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