CN116499446A - Triaxial fiber optic gyroscope and inertial measurement unit based on multi-path wide spectrum light source - Google Patents
Triaxial fiber optic gyroscope and inertial measurement unit based on multi-path wide spectrum light source Download PDFInfo
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- CN116499446A CN116499446A CN202310759896.0A CN202310759896A CN116499446A CN 116499446 A CN116499446 A CN 116499446A CN 202310759896 A CN202310759896 A CN 202310759896A CN 116499446 A CN116499446 A CN 116499446A
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- 238000005259 measurement Methods 0.000 title claims abstract description 12
- 239000013307 optical fiber Substances 0.000 claims abstract description 128
- 239000004065 semiconductor Substances 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 4
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- 230000005693 optoelectronics Effects 0.000 description 5
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- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
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- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
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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
- G01C19/721—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/10—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration
- G01C21/12—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning
- G01C21/16—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning by integrating acceleration or speed, i.e. inertial navigation
- G01C21/18—Stabilised platforms, e.g. by gyroscope
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Abstract
The invention discloses a triaxial fiber optic gyroscope based on a multi-path broad spectrum light source, which comprises a light path component, a circuit component and a structural component. The optical path component comprises a plurality of paths of wide-spectrum light sources, three 2X 2 optical fiber couplers, three PIN-FET photoelectric detectors, three Y waveguides and three optical fiber rings; the multi-path wide-spectrum light source comprises a light source chip, a thermistor, a semiconductor refrigerator, an optical fiber tail fiber with a lens and a butterfly-shaped tube shell; the light source chip comprises three SLD/SLED chips, the three light source chips share a thermistor and a semiconductor refrigerator, and the three light source chips output light waves through three optical fiber pigtails with lenses. The circuit assembly comprises a constant current drive and temperature control circuit board, a PIN-FET photoelectric assembly circuit board and a main circuit board; the structural member comprises a body, a housing and a bottom plate. The invention also discloses an inertial measurement unit which comprises the three-axis fiber optic gyroscope and the three-axis MEMS accelerometer based on the multi-path wide-spectrum light source. The invention has the advantages of saving power consumption, reducing optical fiber fusion points and reducing cost.
Description
Technical Field
The invention relates to the technical field of inertial measurement, in particular to a triaxial fiber optic gyroscope based on a multi-path wide-spectrum light source and an inertial measurement unit.
Background
The fiber optic gyroscope is an inertial sensor for measuring angular velocity based on Sagnac effect, and has the advantages of quick start, large dynamic range, good anti-vibration impact performance, small electromagnetic influence and the like, and the precision range of the fiber optic gyroscope covers tactical level, navigation level to precision level. In inertial navigation or attitude control applications, angular velocity information in three orthogonal directions needs to be measured, so that the triaxial fiber optic gyroscope becomes a direction of research and application; the triaxial fiber optic gyroscope is widely applied to the fields of aerospace, precise guided ammunition, ship navigation, unmanned aerial vehicle and the like, and has great development space and wide market prospect.
In the prior art, a triaxial fiber optic gyroscope generally adopts a design of sharing an SLD light source, and the output power of the SLD light source is improved by increasing the value of a constant current source so as to meet the requirement of the triaxial fiber optic gyroscope. There are two schemes for dividing the light output from the SLD light source into three paths of optical fiber couplers: one solution is to directly use a 1×3 (or 3×3) fiber coupler to enter three independent, orthogonal branches, respectively; another solution is to use two stages of 1×2 (or 2×2) fiber couplers, where the splitting ratio of the first stage coupler is 1:2 and the splitting ratio of the second stage coupler is 1:1. The existing three-axis fiber optic gyroscope shares the SLD light source, and has the technical problems that the power consumption is large, and the fusion loss can be increased due to the fact that the fusion point of the optical fiber is high.
Disclosure of Invention
The invention aims to provide a triaxial fiber optic gyroscope based on a multi-path wide-spectrum light source, which solves the technical problems that the existing triaxial fiber optic gyroscope shares an SLD light source, has larger power consumption and the melting point of an optical fiber is more and the welding loss is increased.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the triaxial fiber optic gyroscope based on the multi-path wide-spectrum light source comprises a light path component, a circuit component and a structural member, wherein the light path component comprises the multi-path wide-spectrum light source, a fiber optic coupler, a photoelectric detector, a Y waveguide and a fiber optic ring;
the multi-path wide-spectrum light source comprises a light source chip, a thermistor, a semiconductor refrigerator, an optical fiber tail fiber with a lens and a butterfly-shaped tube shell;
the light source chips are SLD/SLED chips, and the number of the light source chips is three; the thermistor is a negative temperature coefficient thermistor, and three light source chips share the thermistor; three light source chips are arranged on a shared semiconductor refrigerator through heat sinks, and output light waves through three optical fiber tail fibers with lenses;
the light source chip, the thermistor and the semiconductor refrigerator are all packaged in the accommodating space of the butterfly-shaped tube shell; the butterfly-shaped tube shell comprises a plurality of pins, wherein the pins are used for connecting an external circuit with the light source chip, the thermistor and the semiconductor refrigerator;
the optical fiber couplers comprise three 2X 2 optical fiber couplers, namely a first optical fiber coupler, a second optical fiber coupler and a third optical fiber coupler, wherein the split ratio of the three 2X 2 optical fiber couplers is 1:1;
the photoelectric detector comprises three PIN-FET photoelectric detectors, namely a first photoelectric detector, a second photoelectric detector and a third photoelectric detector;
the number of the Y waveguides is three, and the Y waveguides are a first Y waveguide, a second Y waveguide and a third Y waveguide respectively;
the number of the optical fiber rings is three, namely a first optical fiber ring, a second optical fiber ring and a third optical fiber ring;
one optical fiber at the input ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler is respectively connected with three optical fiber tail fibers with lenses of the multipath wide-spectrum light source; the other optical fibers at the input ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler are respectively connected with the first photoelectric detector, the second photoelectric detector and the third photoelectric detector;
one tail fiber of the output ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler is connected with the input ends of the first Y waveguide, the second Y waveguide and the third Y waveguide respectively; the other tail fibers at the output ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler are used as blank heads; the output ends of the first Y waveguide, the second Y waveguide and the third Y waveguide are respectively connected with the first optical fiber ring, the second optical fiber ring and the third optical fiber ring;
the circuit assembly comprises a constant current driving and temperature controlling circuit board, a PIN-FET photoelectric assembly circuit board and a main circuit board, wherein a signal detection processing circuit, a digital phase step wave feedback loop, a communication interface and a power supply circuit are arranged on the main circuit board;
the constant current driving and temperature controlling circuit board is connected with the multipath wide spectrum light source; the PIN-FET photoelectric component circuit board is welded with a first photoelectric detector, a second photoelectric detector and a third photoelectric detector; the signal detection processing circuit outputs angular velocity information by using a communication interface on one hand, and realizes closed loop by a digital phase step wave feedback loop on the other hand; the power supply circuit respectively supplies power to the constant current driving and temperature control circuit board, the PIN-FET photoelectric component circuit board and the main circuit board;
the structural member comprises a body, a housing and a bottom plate; the body is hexahedral structure, and the upper surface, the lower surface of body are all mutually orthogonal with two adjacent sides, light path subassembly, circuit subassembly are all installed on the body, and the housing is used for covering the body and realizes structural closure with the bottom plate.
Further, a light source mounting groove is formed in the first side face of the body, and a plurality of paths of wide-spectrum light sources are mounted in the light source mounting groove and fixed by glue; four corners of the light source mounting groove are provided with mounting columns with threaded holes, and the constant current drive and temperature control circuit board is fixed on the mounting columns on the first side face through screws.
Further, the second side surface of the body is provided with three strip-shaped grooves side by side, and the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler are respectively placed in the three strip-shaped grooves and fixed by glue; four corners of the three strip-shaped grooves are provided with mounting columns with threaded holes, and the PIN-FET photoelectric component circuit board is fixed on the mounting columns on the second side face by screws.
Further, a rectangular groove is formed in the upper surface of the body, and the first Y waveguide, the second Y waveguide and the third Y waveguide are arranged in parallel in the rectangular groove and fixed through screws; four corners of the upper surface of the body are provided with mounting posts with threaded holes, and the main circuit board is fixed on the mounting posts on the upper surface of the body by screws.
Further, the lower surface and the other two sides of body have all seted up annular groove, annular groove's intermediate position is provided with optic fibre and encircles the post, and first optic fibre ring, second optic fibre ring, third optic fibre ring are all installed annular groove is fixed with glue.
Further, the upper surface of the body is also provided with a round hole, a temperature sensor is arranged in the round hole, and the temperature sensor is connected with the main circuit board.
Further, the signal detection processing circuit comprises a pre-amplifier, an A/D converter and an FPGA which are sequentially connected; the preamplifier is connected with the photodetector.
Further, the communication interface is an RS422 interface.
Another object of the present invention is to provide an inertial measurement unit, including a triaxial gyroscope and a triaxial accelerometer, wherein the triaxial gyroscope adopts the triaxial fiber optic gyroscope based on the multi-path wide spectrum light source, and the triaxial accelerometer adopts a triaxial MEMS accelerometer; the three-axis fiber optic gyroscope based on the multi-path wide spectrum light source and the three-axis MEMS accelerometer share the FPGA, the three-axis MEMS accelerometer is connected with the FPGA through an SPI interface, and the FPGA outputs data through an RS422 interface when triggering clock synchronization signals.
Compared with the prior art, the invention has the beneficial effects that:
1. because the novel design of the multi-path wide-spectrum light source is adopted, an optical fiber coupler for dividing the light output by the light source into three paths is not needed, and the novel optical fiber coupler has the advantages of saving power consumption, reducing optical fiber fusion points and reducing cost.
2. The three-axis fiber optic gyroscope and the three-axis MEMS accelerometer based on the multi-path wide-spectrum light source share the FPGA, and have the advantage of higher integration level.
Drawings
FIG. 1 is a perspective view of a triaxial fiber optic gyroscope and inertial measurement unit based on a multi-path broad spectrum light source according to the present invention.
FIG. 2 is an exploded view of the internal structure of the triaxial fiber optic gyroscope and inertial measurement unit based on the multi-path broad spectrum light source of the present invention.
FIG. 3 is a schematic diagram of the operation of the triaxial fiber optic gyroscope and inertial measurement unit based on a multi-path broad spectrum light source of the present invention.
Fig. 4 is a schematic structural view of the multi-path broad spectrum light source of the present invention.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1-2, the triaxial fiber optic gyroscope based on a multi-path broad spectrum light source provided by the invention comprises a light path component, a circuit component and a structural component.
The structural member includes a housing 10, a base 20, and a body 30. The body 30 is of a hexahedral structure, the upper surface and the lower surface of the body 30 are orthogonal to two adjacent side surfaces, the light path component and the circuit component are both arranged on the body 30, and the housing 10 is used for housing the body 30 and realizing structural sealing with the bottom plate 20. Optionally, the material of the structural member is an aluminum alloy.
The optical path component comprises a multi-path broad spectrum light source 1, an optical fiber coupler 2, a photoelectric detector 3, a Y waveguide 4 and an optical fiber ring 5. The circuit assembly includes a constant current drive and temperature control circuit board 40, a PIN-FET optoelectronic assembly circuit board 50, and a main circuit board 60. The main circuit board 60 is provided with a signal detection processing circuit, a digital phase step wave feedback loop, a power supply circuit, and a communication interface. The optical path components and the circuit components are all mounted on the body 30.
The first side 31 of the body 30 is provided with a light source mounting groove, and the multi-path broad spectrum light source 1 is mounted in the light source mounting groove and fixed by glue. Specifically, the multi-path broad spectrum light source 1 is fixed by AB glue. Four corners of the light source mounting groove are provided with mounting posts with threaded holes, and the constant current drive and temperature control circuit board 40 is fixed on the mounting posts on the first side surface by screws. The constant current driving and temperature controlling circuit board 40 is connected with the multi-path wide spectrum light source 1.
The optical fiber coupler 2 comprises three 2×2 optical fiber couplers, namely a first optical fiber coupler, a second optical fiber coupler and a third optical fiber coupler, wherein the split ratio of the three 2×2 optical fiber couplers is 1:1. The second side 32 of the body is provided with three strip-shaped grooves side by side, and the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler are respectively placed in the three strip-shaped grooves and fixed by glue. Four corners of the three strip-shaped grooves are provided with mounting columns with threaded holes.
The photodetector 3 comprises three PIN-FET photodetectors, namely a first photodetector, a second photodetector and a third photodetector. The first, second and third photodetectors are soldered to the PIN-FET optoelectronic package circuit board 50. The PIN-FET optoelectronic package circuit board 50 is screwed onto the mounting posts of the second side 32. The PIN-FET optoelectronic package circuit board 50 is connected to the main circuit board 60 by an inter-board connector.
The number of the Y waveguides 4 is three, namely a first Y waveguide, a second Y waveguide and a third Y waveguide. The upper surface of the body 30 is provided with a rectangular groove, and the first Y waveguide, the second Y waveguide and the third Y waveguide are all arranged in the rectangular groove and fixed by screws. Four corners of the upper surface of the body 30 are provided with mounting posts with threaded holes, and the main circuit board 60 is screwed onto the mounting posts on the upper surface of the body. The upper surface of the body 30 is further provided with a round hole, a temperature sensor 6 is placed in the round hole, the temperature sensor 6 is connected with the main circuit board 60, and temperature information provided by the temperature sensor 6 can be used for temperature compensation of the optical fiber gyroscope.
The number of the optical fiber rings 5 is three, namely a first optical fiber ring, a second optical fiber ring and a third optical fiber ring. The three optical fiber rings 5 are arranged in an orthogonal manner, and the first optical fiber ring, the second optical fiber ring and the third optical fiber ring are respectively used for an X-axis optical fiber gyro, a Y-axis optical fiber gyro and a Z-axis optical fiber gyro. The lower surface and the other two sides of the body 30 are both provided with annular grooves, the middle position of the annular grooves is provided with optical fiber surrounding columns, and the first optical fiber ring, the second optical fiber ring and the third optical fiber ring are all installed in the annular grooves and fixed by glue.
Referring to fig. 3, one optical fiber at the input ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler is connected with three optical fiber pigtails with lenses of the multi-path broad spectrum light source 1 respectively. The other optical fibers at the input ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler are respectively connected with the first photoelectric detector, the second photoelectric detector and the third photoelectric detector.
One tail fiber of the output ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler is connected with the input ends of the first Y waveguide, the second Y waveguide and the third Y waveguide respectively; and the other tail fibers at the output ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler are used as blank heads. The output ends of the first Y waveguide, the second Y waveguide and the third Y waveguide are respectively connected with the first optical fiber ring, the second optical fiber ring and the third optical fiber ring.
The signal detection processing circuit comprises a pre-amplifier, an A/D converter and an FPGA which are sequentially connected. The preamplifier is connected with the photoelectric detector 3, amplifies a voltage signal output by the photoelectric detector 3, converts the voltage signal into a digital signal through the A/D converter, demodulates and integrates the digital signal by the FPGA to obtain an angular velocity signal, and smoothes the angular velocity signal to obtain angular velocity information output by the optical fiber gyroscope. The optical fiber gyroscope outputs angular velocity information by using a communication interface, and the preferred communication interface adopts an RS422 interface, and other communication interfaces can be adopted in practical application, which is not limited herein. The communication interface outputs angular velocity information by using an electric connector.
The digital phase step wave feedback loop comprises an FPGA, a D/A converter, an operational amplifier and a Y waveguide 4 which are sequentially connected. The step wave signal generated by the FPGA is overlapped with the square wave modulation signal to generate a digital step wave feedback control signal, the digital step wave feedback control signal is converted into an analog signal through a D/A converter, a phase modulator on the Y waveguide 4 is driven after the digital step wave feedback control signal passes through an operational amplifier, and a feedback phase difference is introduced into the optical fiber loop 5 to offset the Sagnac phase difference, so that the optical fiber gyroscope is stabilized at a point with zero phase difference to complete closed loop work.
The power supply circuit supplies power to the constant current drive and temperature control circuit board 40, the PIN-FET optoelectronic component circuit board 50 and the main circuit board 60, respectively.
The invention also provides an inertial measurement unit, which comprises a triaxial gyroscope and a triaxial accelerometer, wherein the triaxial gyroscope adopts the triaxial fiber optic gyroscope based on the multi-path wide-spectrum light source, and the triaxial accelerometer adopts a triaxial MEMS accelerometer 100; the triaxial fiber optic gyroscope based on the multi-path wide spectrum light source and the triaxial MEMS accelerometer 100 share an FPGA, the triaxial MEMS accelerometer 100 is connected with the FPGA through an SPI interface, and the FPGA outputs data through an RS422 interface when triggering clock synchronization signals. Optionally, the clock synchronization signal is triggered inside the FPGA; in the product development process, the clock synchronization signal can also be triggered outside the FPGA, which is not limited herein. The inertial measurement unit can accurately measure the angular velocity and acceleration information of the moving carrier.
Referring to fig. 4, the multi-path broad spectrum light source 1 includes a light source chip 11, a thermistor 12, a semiconductor refrigerator 13, a lensed fiber pigtail 14, and a butterfly-shaped tube 15. The light source chips 11 are SLD/SLED chips, and the number of the light source chips 11 is three. The three light source chips 11 are mounted on a common semiconductor refrigerator 13 by a heat sink which is an aluminum nitride ceramic substrate. The three light source chips 11 are fixed on the aluminum nitride ceramic substrate by a chip carrier using a soldering process. The three light source chips 11 output light waves through the lensed fiber pigtails 14. The thermistor 12 is a negative temperature coefficient thermistor, and is used for sensing the temperature change of the light source chips 11, and the three light source chips 11 share the thermistor 12.
The light source chip 11, the thermistor 12 and the semiconductor refrigerator 13 are all packaged in the accommodating space of the butterfly tube 15. The butterfly tube 15 includes a plurality of pins 16, and the pins 16 are used for connecting an external circuit with the light source chip 11, the thermistor 12, and the semiconductor refrigerator 13. The multi-path broad spectrum light source 1 adopts a 12-needle butterfly package.
The external circuit comprises an automatic temperature control circuit and a constant current driving circuit. The automatic temperature control circuit and the constant current driving circuit are arranged on the constant current driving and temperature control circuit board 40; the thermistor 12 and the semiconductor refrigerator 13 are both connected with an automatic temperature control circuit, and the light source chip 11 is connected with a constant current driving circuit. The automatic temperature control circuit drives the semiconductor refrigerator 13 to cool or heat, thereby controlling and stabilizing the temperature of the light source chip 11. The constant current driving circuit provides constant driving current for the light source chip 11, and ensures the stability of the output light power and the center wavelength of the light source chip 11.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. The triaxial fiber optic gyroscope based on the multi-path wide spectrum light source comprises a light path component, a circuit component and a structural component, and is characterized in that: the optical path component comprises a plurality of paths of wide-spectrum light sources, an optical fiber coupler, a photoelectric detector, a Y waveguide and an optical fiber ring;
the multi-path wide-spectrum light source comprises a light source chip, a thermistor, a semiconductor refrigerator, an optical fiber tail fiber with a lens and a butterfly-shaped tube shell;
the light source chips are SLD/SLED chips, and the number of the light source chips is three; the thermistor is a negative temperature coefficient thermistor, and three light source chips share the thermistor; three light source chips are arranged on a shared semiconductor refrigerator through heat sinks, and output light waves through three optical fiber tail fibers with lenses;
the light source chip, the thermistor and the semiconductor refrigerator are all packaged in the accommodating space of the butterfly-shaped tube shell; the butterfly-shaped tube shell comprises a plurality of pins, wherein the pins are used for connecting an external circuit with the light source chip, the thermistor and the semiconductor refrigerator;
the optical fiber couplers comprise three 2X 2 optical fiber couplers, namely a first optical fiber coupler, a second optical fiber coupler and a third optical fiber coupler, wherein the split ratio of the three 2X 2 optical fiber couplers is 1:1;
the photoelectric detector comprises three PIN-FET photoelectric detectors, namely a first photoelectric detector, a second photoelectric detector and a third photoelectric detector;
the number of the Y waveguides is three, and the Y waveguides are a first Y waveguide, a second Y waveguide and a third Y waveguide respectively;
the number of the optical fiber rings is three, namely a first optical fiber ring, a second optical fiber ring and a third optical fiber ring;
one optical fiber at the input ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler is respectively connected with three optical fiber tail fibers with lenses of the multipath wide-spectrum light source; the other optical fibers at the input ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler are respectively connected with the first photoelectric detector, the second photoelectric detector and the third photoelectric detector;
one tail fiber of the output ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler is connected with the input ends of the first Y waveguide, the second Y waveguide and the third Y waveguide respectively; the other tail fibers at the output ends of the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler are used as blank heads; the output ends of the first Y waveguide, the second Y waveguide and the third Y waveguide are respectively connected with the first optical fiber ring, the second optical fiber ring and the third optical fiber ring;
the circuit assembly comprises a constant current driving and temperature controlling circuit board, a PIN-FET photoelectric assembly circuit board and a main circuit board, wherein a signal detection processing circuit, a digital phase step wave feedback loop, a communication interface and a power supply circuit are arranged on the main circuit board;
the constant current driving and temperature controlling circuit board is connected with the multipath wide spectrum light source; the PIN-FET photoelectric component circuit board is welded with a first photoelectric detector, a second photoelectric detector and a third photoelectric detector; the signal detection processing circuit outputs angular velocity information by using a communication interface on one hand, and realizes closed loop by a digital phase step wave feedback loop on the other hand; the power supply circuit respectively supplies power to the constant current driving and temperature control circuit board, the PIN-FET photoelectric component circuit board and the main circuit board;
the structural member comprises a body, a housing and a bottom plate; the body is hexahedral structure, and the upper surface, the lower surface of body are all mutually orthogonal with two adjacent sides, light path subassembly, circuit subassembly are all installed on the body, and the housing is used for covering the body and realizes structural closure with the bottom plate.
2. The triaxial fiber optic gyroscope based on a multi-path broad spectrum light source according to claim 1, wherein: a light source mounting groove is formed in the first side surface of the body, and a plurality of paths of wide-spectrum light sources are mounted in the light source mounting groove and fixed by glue; four corners of the light source mounting groove are provided with mounting columns with threaded holes, and the constant current drive and temperature control circuit board is fixed on the mounting columns on the first side face through screws.
3. The triaxial fiber optic gyroscope based on a multi-path broad spectrum light source according to claim 1, wherein: the second side of the body is provided with three strip-shaped grooves side by side, and the first optical fiber coupler, the second optical fiber coupler and the third optical fiber coupler are respectively placed in the three strip-shaped grooves and fixed by glue; four corners of the three strip-shaped grooves are provided with mounting columns with threaded holes, and the PIN-FET photoelectric component circuit board is fixed on the mounting columns on the second side face by screws.
4. The triaxial fiber optic gyroscope based on a multi-path broad spectrum light source according to claim 1, wherein: the upper surface of the body is provided with a rectangular groove, and the first Y waveguide, the second Y waveguide and the third Y waveguide are arranged in parallel in the rectangular groove and fixed by screws; four corners of the upper surface of the body are provided with mounting posts with threaded holes, and the main circuit board is fixed on the mounting posts on the upper surface of the body by screws.
5. The triaxial fiber optic gyroscope based on a multi-path broad spectrum light source according to claim 1, wherein: the lower surface and the other two sides of body have all seted up annular groove, annular groove's intermediate position is provided with optic fibre and encircles the post, and first optic fibre ring, second optic fibre ring, third optic fibre ring are all installed annular groove is fixed with glue.
6. The triaxial fiber optic gyroscope based on a multi-path broad spectrum light source according to claim 4, wherein: the upper surface of body has still seted up the round hole, places temperature sensor in the round hole, temperature sensor is connected with main circuit board.
7. The triaxial fiber optic gyroscope based on a multi-path broad spectrum light source according to claim 1, wherein: the signal detection processing circuit comprises a pre-amplifier, an A/D converter and an FPGA which are sequentially connected; the preamplifier is connected with the photodetector.
8. The triaxial fiber optic gyroscope based on a multi-path broad spectrum light source according to claim 1, wherein: the communication interface is an RS422 interface.
9. The inertial measurement unit comprises a triaxial gyroscope and a triaxial accelerometer, and is characterized in that: the triaxial gyroscope adopts the triaxial fiber optic gyroscope based on the multi-path wide-spectrum light source according to any one of claims 1 to 8, and the triaxial accelerometer adopts a triaxial MEMS accelerometer; the three-axis fiber optic gyroscope based on the multi-path wide spectrum light source and the three-axis MEMS accelerometer share the FPGA, the three-axis MEMS accelerometer is connected with the FPGA through an SPI interface, and the FPGA outputs data through an RS422 interface when triggering clock synchronization signals.
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