CN110319825A - A kind of small Twin-shaft optical fibre gyro based on binary channels design - Google Patents

Abstract

The invention relates to a small dual-axis fiber optic gyroscope based on a dual-channel design, including an optical path part and a circuit part, the optical path part includes two parallel channels, and the circuit part includes a light source board (1) and a detection board ( 20), described detection board (20) is provided with double-channel AD converter (14), FPGA signal processor (15) and double-channel DA converter (16) connected in sequence, described light source board (1 ) after the light sent by the optical path part, the signals of the two channels enter the dual-channel AD converter (14), the FPGA signal processor (15) outputs the calculation result, and the control signal is returned to the two channels through the dual-channel DA converter (16). channels. Compared with the prior art, the present invention adopts dual-channel AD and dual-channel DA chips, saving the layout area of circuit boards. The miniaturized design of the dual-axis gyroscope has the advantages of small size and low power consumption.

Description

A small dual-axis fiber optic gyroscope based on dual-channel design

technical field

The invention relates to a dual-axis optical fiber gyroscope, in particular to a small dual-axis optical fiber gyroscope based on a dual-channel design.

Background technique

Gyroscope is an angular rate sensor, a device sensitive to angular motion in relative inertial space, and is currently the main sensor used to determine the spatial motion attitude of moving objects. It can be applied to various fields of sea, land, air and sky. A dual-axis gyroscope can measure angular rate in two dimensions. Traditional dual-axis fiber optic gyroscopes generally use two AD chips and two DA chips. This results in an increase in the layout area of the circuit board, making miniaturization impossible. The application field of fiber optic gyroscopes has very strict requirements on the size and power consumption of fiber optic gyroscopes, and there is an urgent need for a small-volume, low-power dual-axis fiber optic gyroscope. Existing dual-axis fiber optic gyroscopes cannot meet the needs of use.

Contents of the invention

The purpose of the present invention is to provide a small dual-axis fiber optic gyroscope based on a dual-channel design in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A small dual-axis fiber optic gyroscope based on a dual-channel design, including an optical path part and a circuit part, the optical path part includes two parallel channels, the circuit part includes a light source board and a detection board, and the detection board There are dual-channel AD converters, FPGA signal processors and dual-channel DA converters connected in sequence. After the light emitted by the light source board passes through the optical path, the signals of the two channels enter the dual-channel AD converters, and the FPGA signal processing The controller outputs the calculation result, and returns the control signal to the two channels through the dual-channel DA converter.

The optical path part includes a total coupler and two channels. The first channel includes a first coupler, a first Y waveguide, a first fiber ring and a first detector. The light passes through the total coupler and then enters the first coupling The first Y waveguide and the first Y waveguide, and then turn back in the first fiber ring, return to the first detector by the first Y waveguide and the first coupler in turn, and then enter the detection board, the second channel has the same structure as the first channel .

The light path part also includes a superluminescent light emitting diode, and the superluminescent light emitting diode is arranged between the light source board and the total coupler.

The front end of the dual-channel AD converter is connected with two preamplifiers, and the two preamplifiers are correspondingly connected with the detectors on the two channels.

The rear end of the dual-channel DA converter is connected with two post-amplifiers, and the two post-amplifiers are correspondingly connected to the Y waveguides on the two channels.

The dual-channel AD converter is the AD9231 chip of ADI Company.

The dual-channel DA converter is the AD9717 chip of ADI Company.

Compared with the prior art, the present invention adopts dual-channel AD and dual-channel DA chips, saving the layout area of circuit boards. Realize the miniaturization design of the two-axis gyroscope. It has the advantages of small size and low power consumption; a super-radiant light-emitting diode is arranged between the light source board and the total coupler, the output power is high, the divergence angle is small, and the coupling efficiency and response speed are improved.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

Example

As shown in Figure 1, a small dual-axis fiber optic gyroscope based on a dual-channel design includes an optical path part and a circuit part. The optical path part includes two parallel channels, and the circuit part includes a light source board 1 and a detection board 20. A dual-channel AD converter 14, an FPGA signal processor 15 and a dual-channel DA converter 16 connected in sequence are provided. After the light emitted by the light source board 1 passes through the optical path, the signals of the two channels enter the dual-channel AD converter 14, and the FPGA The signal processor 15 outputs calculation results, and returns control signals to the two channels through the dual-channel DA converter 16 .

The optical path part includes a superluminescent diode 2 (SLD, Superluminescent diode), a total coupler 3 and two channels, the first channel includes a first coupler 4, a first Y waveguide 5, a first fiber ring 6 and a first detection 10, the light emitted by the light source board 1 passes through the main coupler 3 and then enters the first coupler 4 and the first Y waveguide 5, and then turns back in the first fiber ring 6, and is sequentially transmitted by the first Y waveguide 5 and the first coupling The sensor 4 returns to the first detector 10, and then enters the detection plate 20; the second channel includes the second coupler 7, the second Y waveguide 8, the second fiber ring 9 and the second detector 12, and the light passes through the total coupler 3. The shunt enters the second coupler 7 and the second Y waveguide 8 in turn, then turns back in the second fiber ring 9, returns to the second detector 12 from the second Y waveguide 8 and the second coupler 7 in turn, and then enters the detection Plate 20.

On the detection board 20, the front end of the dual-channel AD converter 14 is connected with the first preamplifier 11 and the second preamplifier 13, and the two preamplifiers are correspondingly connected with the detectors on the two channels; the dual-channel DA converter 16 The rear end is connected with a first post-amplifier 17 and a second post-amplifier 18, and the two post-amplifiers are correspondingly connected with the Y waveguides on the two channels, and the signal of the FPGA signal processor 15 is output by the interface circuit 19.

Dual-channel AD converter 14 is the AD9231 chip of ADI Company, which is a 12-bit, 20M/40M/65M sampling rate, 1.8V power supply dual-channel analog-to-digital converter. It has excellent characteristics and extremely low power consumption.

Dual-channel DA converter 16 is the AD9717 chip of ADI Company, which is a 14-bit, low-power, dual-channel digital-to-analog converter. The update rate can reach 125MHz, only 86mW. And the packaging volume is only 6mm*6mm. Save 1 times the board space area.

Claims (7)

1. a kind of small Twin-shaft optical fibre gyro based on binary channels design, including light path part and circuit part, the optical path Part includes two parallel channels, and the circuit part includes light source board (1) and detecting plate (20), which is characterized in that institute The detecting plate (20) stated is equipped with sequentially connected double channel A/D converter (14), FPGA signal processor (15) and binary channels DA Converter (16), after light path part, the signal in two channels enters double channel A/D and turns the light that the light source board (1) issues Parallel operation (14), FPGA signal processor (15) exports calculated result, and control signal is returned by binary channels D/A converter (16) Go back to two channels.

2. a kind of small Twin-shaft optical fibre gyro based on binary channels design according to claim 1, which is characterized in that described Light path part include total coupler (3) and two channels, first channel include the first coupler (4), the first Y waveguide (5), First fiber optic loop (6) and the first detector (10), light by total coupler (3) shunt sequentially enter the first coupler (4) and First Y waveguide (5) is then turned back in the first fiber optic loop (6), is successively returned by the first Y waveguide (5) and the first coupler (4) To the first detector (10), subsequently into detecting plate (20), second channel is identical as first channel design.

3. a kind of small Twin-shaft optical fibre gyro based on binary channels design according to claim 2, which is characterized in that described Light path part further include super-radiance light emitting diode (2), the super-radiance light emitting diode (2) is arranged in light source board (1) Between total coupler (3).

4. a kind of small Twin-shaft optical fibre gyro based on binary channels design according to claim 2, which is characterized in that described Double channel A/D converter (14) front end even there are two preamplifier, on two preamplifiers and two channels Detector is correspondingly connected with.

5. a kind of small Twin-shaft optical fibre gyro based on binary channels design according to claim 2, which is characterized in that described Binary channels D/A converter (16) rear end even there are two post amplifier, on two post amplifiers and two channels Y waveguide is correspondingly connected with.

6. a kind of small Twin-shaft optical fibre gyro based on binary channels design according to claim 1, which is characterized in that described Double channel A/D converter (14) be ADI company AD9231 chip.

7. a kind of small Twin-shaft optical fibre gyro based on binary channels design according to claim 1, which is characterized in that described Binary channels D/A converter (16) be ADI company AD9717 chip.