Single-shaft 70 fiber-optic gyroscope system

Abstract

The utility model discloses a single-shaft 70 fiber-optic gyroscope system and relates to the technical field of fiber-optic gyroscope inertial navigation. The optical fiber light source and the optical path detector are electrically connected with the coupler, the coupler, the digital closed-loop control signal processing circuit and the D / A converter are respectively connected with the Y waveguide, the Y waveguide is connected with the polarization maintaining optical fiber ring, the optical path detector is connected with the A / D converter, and the A / D converter is connected with the digital closed-loop control signal processing circuit. The digital closed-loop control signal processing circuit is connected with the digital filter circuit; the sequential control circuit is connected with the A / D converter, the digital closed-loop control signal processing circuit and the D / A converter respectively; the fiber-optic gyroscope system provided by the utility model has the advantages of miniaturization, high reliability and low cost; the overall size of the fiber-optic gyroscope is reduced, meanwhile, the precision index is controlled within an acceptable range, the system is simple in structure, and batch production can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of optical fiber gyro inertial navigation technology, more particularly to a single shaft 70 optical fiber gyro system. BACKGROUND

[0002] The core working principle of the optical fiber gyro is based on the Sagnac effect, which is a universal correlation effect of propagating light in a closed loop optical path rotating in the relative inertial space. Specifically, when two beams of light with the same characteristics emitted by the same light source propagate in opposite directions in a closed optical path and finally converge at the same detection point, if there is a relative rotation angular velocity around the axis perpendicular to the plane of the closed optical path in the relative inertial space, the optical paths of the light beams propagating in opposite directions will be different, thereby producing an optical path difference. This optical path difference is proportional to the angular velocity of rotation, so by measuring the optical path difference and the corresponding phase difference, the rotation angular velocity can be accurately determined.

[0003] At present, with the market demand, the optical fiber gyro needs a high-precision, small-sized and low-cost optical fiber gyro system. SUMMARY

[0004] To solve the problems mentioned in the background art, the purpose of the utility model is to provide a single shaft 70 optical fiber gyro system.

[0005] The single shaft 70 optical fiber gyro system of the utility model, including optical fiber light source, coupler, Y waveguide, polarization maintaining optical fiber ring, optical path detector, A / D converter, D / A converter, time sequence control circuit, digital filter circuit, digital closed loop control signal processing circuit, optical fiber light source, optical path detector are all electrically connected with coupler, coupler, digital closed loop control signal processing circuit, D / A converter are connected with Y waveguide respectively, Y waveguide is connected with polarization maintaining optical fiber ring, optical path detector is connected with A / D converter, A / D converter is connected with digital closed loop control signal processing circuit, digital closed loop control signal processing circuit is connected with digital filter circuit, time sequence control circuit is connected with A / D converter, digital closed loop control signal processing circuit, D / A converter respectively.

[0006] As a preferred scheme: the optical fiber light source is composed of super radiation light emitting diode light source and closed loop control driving circuit, and the optical fiber light source outputs 1310nm wavelength.

[0007] As a preferred scheme: the Y waveguide is a Y waveguide with a wavelength of 1310nm.

[0008] As a preferred scheme: the optical path detector is an 8pin dual-in-line metal tube shell package, and is an optical path detector with a magnification of 200 times.

[0009] As a preferred solution: the polarization maintaining optical fiber ring is 60 / 100 micron fiber, the maximum outer diameter of the fiber ring is less than 64mm, and the height is less than 11mm.

[0010] Compared with the prior art, the utility model has the beneficial effects that:

[0011] One, miniaturization, high reliability, low cost of fiber optic gyroscope system.

[0012] Two, realize the fiber optic gyroscope system that the whole size of fiber optic gyroscope is reduced while guaranteeing precision index control in acceptable range.

[0013] Three, the system structure is simple, and batch production can be carried out. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to facilitate the description, the utility model is described in detail by the following specific embodiments and drawings.

[0015] Figure 1 It is the structural schematic diagram of the utility model.

[0016] Figure 2 It is the working principle diagram of the utility model;

[0017] Figure 3 It is the flow chart of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantage of the utility model more clear and obvious, the following specific embodiments shown in the drawings are used to describe the utility model.But it should be understood that these descriptions are only exemplary, and not to limit the scope of the utility model.The structure, proportion, size etc.

[0019] Here, it also needs to be explained that, in order to avoid the unnecessary details and obscure the utility model, only the structure and / or processing steps closely related to the scheme according to the utility model are shown in the drawings, and other details not much related to the utility model are omitted.

[0020] Combination Figure 1To illustrate the embodiment, the embodiment adopts the following technical scheme: the fiber light source, the coupler, the Y waveguide, the polarization maintaining fiber ring, the light path detector, the A / D converter, the D / A converter, the time sequence control circuit, the digital filter circuit, and the digital closed loop control signal processing circuit are connected; the fiber light source and the light path detector are electrically connected with the coupler; the coupler, the digital closed loop control signal processing circuit, and the D / A converter are connected with the Y waveguide; the Y waveguide is connected with the polarization maintaining fiber ring; the polarization maintaining fiber ring is selected from 60 / 100 microns fiber, the maximum outer diameter of the fiber ring is less than 64 mm, and the height is less than 11 mm; the light path detector is connected with the A / D converter; the A / D converter is connected with the digital closed loop control signal processing circuit; the digital closed loop control signal processing circuit is connected with the digital filter circuit; and the time sequence control circuit is connected with the A / D converter, the digital closed loop control signal processing circuit, and the D / A converter.

[0021] The light path part is most susceptible to the environment in the two parts, and the polarization maintaining fiber ring is composed of polarization maintaining fiber with a length of hundreds to thousands of kilometers. According to the basic principle of the fiber gyroscope Sagnac effect, the light emitted from the fiber light source is divided into two parts after passing through the coupler and the Y waveguide, and then runs reversely in the polarization maintaining fiber ring. After walking through the entire fiber ring, the light is finally detected by the light path detector. The light intensity of the two light beams is detected by the detector, and then the light path difference between the two light beams is calculated by the A / D conversion and the digital closed loop signal processing part. The size of the light path difference can be used to know the rotation angular velocity of the motion carrier relative to the inertial space. The closed loop fiber gyroscope controls the Y waveguide through feedback to make the output light path difference zero, and realizes the real-time detection of the sensitive angular velocity through active control. In order to realize the synchronization and real-time of the circuit signal processing, all the circuit related parts are controlled under the same time sequence, and the main control chip is selected from the hurricane 10 series of Altra company.

[0022] In combination with Figure 2 To illustrate the embodiment, the fiber gyroscope signal is first converted into a voltage signal by the photoelectric detector, and then converted into a digital signal by the A / D converter after passing through the precision operational amplifier. The FPGA chip is responsible for signal demodulation, integration, and step wave generation of the received digital signal, and the output digital signal is converted into an analog signal by the D / A converter. After the signal is amplified by the amplifier, it is output to the phase modulator to complete the control of the loop. At the same time, the gyroscope digital signal in the FPGA register is sent to the external device.

[0023] In combination with Figure 3The basic structure of the fiber-optic gyroscope software is shown in the embodiment. The light signal after interference is converted into an electric signal by a detector. The signal is input into an A / D converter after being amplified by a preamplifier to be converted into a digital signal. The digital signal converted by the A / D converter is demodulated by a digital demodulator in a digital logic circuit to obtain a phase error signal after closed-loop compensation. The signal is input into a D / A converter after being integrated to be used as an output signal of the gyroscope and an input signal of the closed-loop feedback. The step width of the step wave generated by the second digital integration is the fiber ring transit time τ, and the step height is equal to the output of the gyroscope, and the step change is synchronized with the bias modulation signal. The step wave signal is superimposed with the bias modulation signal, and the result is input into the D / A converter. The D / A converter converts the modulation signal generated by the digital logic circuit into an analog signal, which is applied to both ends of the Y waveguide after being amplified by an operational amplifier.

[0024] In the embodiment, the light source mainly provides necessary light intensity for the rotation of the gyroscope. The coupler is used to distribute the light beam emitted by the light source into the fiber sensing ring to ensure that the light signal is uniformly distributed. The Y waveguide is used to process the light signal to improve the measurement accuracy and stability. The polarization maintaining fiber ring is the core component of the fiber-optic gyroscope. The fiber is wound into a ring and fixed on a rotating carrier. When the carrier rotates, the fiber rotates with it, and the internal structure changes due to stress, which affects the refractive index of the light. The light path detector is responsible for detecting the light reflection and collecting data to realize automatic adjustment and real-time monitoring of the gyroscope. The gyroscope control circuit is mainly responsible for applying a modulation signal to the Y waveguide and collecting and demodulating the voltage signal converted by the detector. At the same time, the gyroscope output signal is sent externally. The overall design of the system is simple, which can ensure the normal and stable operation of the system.

[0025] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0026] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A single-axis 70 fiber-optic gyroscope system, characterized by: The system comprises a fiber light source, a coupler, a Y waveguide, a polarization maintaining fiber ring, an optical path detector, an A / D converter, a D / A converter, a timing control circuit, a digital filter circuit, a digital closed loop control signal processing circuit; the fiber light source and the optical path detector are electrically connected with the coupler, the coupler, the digital closed loop control signal processing circuit and the D / A converter are connected with the Y waveguide, the Y waveguide is connected with the polarization maintaining fiber ring, the optical path detector is connected with the A / D converter, the A / D converter is connected with the digital closed loop control signal processing circuit, the digital closed loop control signal processing circuit is connected with the digital filter circuit, and the timing control circuit is connected with the A / D converter, the digital closed loop control signal processing circuit and the D / A converter.

2. A single-axis fiber-optic gyroscope system according to claim 1, wherein: The fiber light source is composed of a super radiation light emitting diode light source and a closed loop control driving circuit, and the fiber light source outputs a wavelength of 1310 nm.

3. The single-axis fiber-optic gyroscope system of claim 1, wherein: The Y waveguide is a Y waveguide with a wavelength of 1310 nm.

4. The single-axis fiber-optic gyroscope system of claim 1, wherein: The optical path detector is an 8pin dual in-line metal tube shell package, and is a 200 times amplification optical path detector.

5. The single-axis fiber-optic gyroscope system of claim 1, wherein: The polarization maintaining fiber ring is a 60 / 100 micron fiber, and the maximum outer diameter of the fiber ring is less than 64 mm, and the height is less than 11 mm.

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