A fiber-optic gyroscope gain and polarity automatic testing system and method

Abstract

This invention proposes an automatic testing system and method for the gain and polarity of fiber optic gyroscopes. The testing system includes a data acquisition processor, a human-machine interface (HMI) LCD screen, a fiber optic gyroscope gain and polarity algorithm processor, and a power supply. The data acquisition processor stores the gain and polarity measurement algorithm program. After receiving test commands from the HMI LCD screen, it sequentially configures the gain and polarity measurement algorithm program to the FPGA module of the gyroscope under test. The data acquisition processor receives, stores, and parses the gain and polarity measurement data from the gyroscope under test, and sends the results to the HMI LCD screen for display. This invention can perform gain and polarity tests on eight gyroscopes at once without relying on an external turntable or other testing equipment that generates angular velocity, significantly improving production efficiency and reducing the risk of gyroscope damage during testing, laying a solid foundation for the automated mass production testing of fiber optic gyroscopes.

Description

Technical Field

[0001] This invention relates to an automatic testing system and method for the gain and polarity of fiber optic gyroscopes, belonging to the field of fiber optic gyroscope testing technology. Background Technology

[0002] Fiber optic gyroscopes, also known as fiber optic angular rate sensors, have advantages such as no moving mechanical parts, insensitivity to acceleration, wide dynamic range, small size, low cost, and low process requirements. They will be used in more and more application scenarios, so the future market demand is very large. Mass production or automated production technology of fiber optic gyroscopes has become one of the key aspects to reduce the production costs of fiber optic gyroscopes.

[0003] Traditional fiber optic gyroscope production and testing primarily rely on manual labor and external testing equipment for interventional testing, resulting in low production efficiency and inherent risks. Optical path assembly is a crucial step in fiber optic gyroscope production, and one of the most important parameters for evaluating its performance is optical path loss. Therefore, the forward channel optical power (gain) of the gyroscope must be measured during assembly, typically using an optical power meter or other testing equipment. This measurement process requires disconnecting the fiber, and factors such as the fiber optic cut angle can affect the measurement results, leading to significant errors in the measured optical power. This measurement process is not only risky but also extremely inefficient.

[0004] After long-term operation, the attenuation of the light source in a fiber optic gyroscope leads to changes in the forward channel gain, causing a decline in the gyroscope's phase-frequency characteristics, accuracy, and other performance indicators, or even rendering it unusable. Therefore, fiber optic gyroscope polarity is also an important parameter. Currently, the production process typically requires the entire gyroscope to be assembled before measurement can be performed. If an incorrect polarity is found at this stage, it is necessary to change the program or the Y-waveguide modulation line sequence, resulting in repetitive work. Furthermore, there is a lack of polarity testing methods during the assembly process. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose an automatic testing system and method for fiber optic gyroscope gain and polarity. This system can measure the forward channel gain and polarity of fiber optic gyroscopes without the need for other testing equipment, thereby reducing the risk of damage to optical fibers or gyroscopes during production testing and effectively improving production efficiency.

[0006] The solution of the present invention is:

[0007] An automatic testing system for fiber optic gyroscope gain and polarity includes a data acquisition processor, a human-machine interface LCD screen, a fiber optic gyroscope gain and polarity calculation unit, and a power supply; wherein:

[0008] Data acquisition processor: After receiving the test command sent by the human-machine interaction LCD screen, it sequentially configures the fiber optic gyroscope gain measurement program and fiber optic gyroscope polarity measurement program to the fiber optic gyroscope gain and polarity calculation unit under test; it receives the measurement data sent by the fiber optic gyroscope gain and polarity algorithm calculation unit, performs analysis and processing, obtains the gain and polarity results, and transmits them to the human-machine interaction LCD screen for display.

[0009] Human-computer interaction LCD screen: Receives test commands input by the user and sends them to the data acquisition processor; receives and displays the gain and polarity results from the data acquisition processor.

[0010] Fiber optic gyroscope gain and polarity calculator: Runs the fiber optic gyroscope gain measurement program, collects gain measurement data and sends it to the data acquisition processor; runs the fiber optic gyroscope polarity measurement program, collects polarity measurement data and sends it to the data acquisition processor.

[0011] Power supply: Provides ±5V DC power to the fiber optic gyroscope and 3.3V DC power to the data acquisition processor and the human-machine interface LCD screen.

[0012] An automatic testing method for the gain and polarity of a fiber optic gyroscope includes:

[0013] The user inputs test commands into the human-computer interaction LCD screen, and the human-computer interaction LCD screen forwards the test commands to the data acquisition processor;

[0014] After receiving the test command, the data acquisition processor will sequentially configure the stored fiber optic gyroscope gain measurement program and fiber optic gyroscope polarity measurement program to the fiber optic gyroscope gain and polarity arithmetic unit.

[0015] The fiber optic gyroscope gain and polarity arithmetic unit in the fiber optic gyroscope under test runs the fiber optic gyroscope gain measurement program, obtains gain measurement data, and sends it to the data acquisition processor.

[0016] The gyroscope under test is reset;

[0017] The fiber optic gyroscope gain and polarity arithmetic unit runs the fiber optic gyroscope polarity measurement program, obtains polarity measurement data, and sends it to the data acquisition processor.

[0018] The data acquisition processor analyzes and processes the acquired gain measurement data and polarity measurement data to obtain the forward channel gain and polarity of the fiber optic gyroscope, and sends them to the human-machine interface LCD screen for display.

[0019] Preferably, the fiber optic gyroscope under test and the data acquisition processor transmit data via an RS422 interface.

[0020] Preferably, the fiber optic gyroscope gain measurement program is implemented as follows:

[0021] Introducing phase quantity ±φ based on the conventional modulation state sequence of fiber optic gyroscopes k Obtain a random modulation state sequence; the conventional modulation state sequence of the fiber optic gyroscope refers to an analog square wave voltage sequence, in order to... Appear alternately in pairs, in the form: +π / 2, -π / 2, +π / 2, -π / 2, +π / 2, -π / 2, +π / 2, -π / 2....;

[0022] Introducing phase quantity The subsequent random modulation state sequence is in the form of: +π / 2, -π / 2, +(π / 2+φ k -(π / 2+φ) k ), +(π / 2-φ k -(π / 2-φ) k );φ k Less than

[0023] +π / 2, -π / 2, +(π / 2+φ k -(π / 2+φ) k ), +(π / 2-φ k -(π / 2-φ) k This is denoted as a random modulation state period. Within this period, the effective interference optical power voltage signal of the fiber optic gyroscope forward channel corresponding to each random modulation state is acquired and converted from analog to digital to obtain the digital voltage signal quantities D1, D2, D3, D4, D5, and D6 corresponding to each random modulation state within this period. The digital voltage signal quantities D1, D2, D3, D4, D5, and D6 corresponding to each random modulation state are the gain measurement data.

[0024] Preferably, the data acquisition processor performs the following analytical processing on the obtained gain measurement data to obtain the forward channel gain P0 of the fiber optic gyroscope:

[0025]

[0026] Preferably, the random modulation state sequence is generated by a random function generator, and the proportion of the random modulation state sequence of the fiber optic gyroscope to all modulation state sequences does not exceed 0.5%.

[0027] Preferably, the fiber optic gyroscope polarity measurement program is implemented as follows:

[0028] A positive phase difference signal is introduced based on the conventional modulation state sequence of a fiber optic gyroscope. Get The fiber optic gyroscope voltage signal corresponding to the modulation state is converted from analog to digital to obtain the digital value D7 of the fiber optic gyroscope voltage signal. The fiber optic gyroscope voltage signal corresponding to the modulation state is converted from analog to digital to obtain the digital quantity D8 of the fiber optic gyroscope voltage signal. D7 and D8 are the polarity measurement data.

[0029] Preferably, the data acquisition processor performs the following analytical processing on the obtained polarity measurement data to obtain the polarity of the fiber optic gyroscope:

[0030] Determine the difference between D7 and D8. If the difference is greater than 0, the fiber optic gyroscope is positive polarity; if the difference is less than 0, the fiber optic gyroscope is negative polarity.

[0031] Preferably, the fiber optic gyroscope polarity measurement program is implemented as follows:

[0032] A negative phase difference signal is introduced based on the conventional modulation state sequence of a fiber optic gyroscope. Get The fiber optic gyroscope voltage signal corresponding to the modulation state is converted from analog to digital to obtain the digital value D9 of the fiber optic gyroscope voltage signal. The fiber optic gyroscope voltage signal corresponding to the modulation state is converted from analog to digital to obtain the digital quantity D of the fiber optic gyroscope voltage signal. 10 The D9 and D 10 This refers to polarity measurement data.

[0033] Preferably, the data acquisition processor performs the following analytical processing on the obtained polarity measurement data to obtain the polarity of the fiber optic gyroscope:

[0034] Determine whether D9 is different from D. 10 The difference between the two values ​​is calculated. If the difference is greater than 0, the fiber optic gyroscope is negative; if the difference is less than 0, the fiber optic gyroscope is positive.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] (1) This invention accurately measures the forward channel gain of the fiber optic gyroscope by adding a random combination of modulation state changes. At the same time, it measures the polarity of the gyroscope by applying a monotonic step wave modulation signal to simulate positive angular rate input. This enables accurate measurement of the gain and polarity of the fiber optic gyroscope without the need for external testing equipment intervention and without opening the cover to disconnect the fiber. This improves testing efficiency and reduces the potential risks to the product caused by testing steps such as cutting the fiber during the testing process. It is safe and efficient.

[0037] (2) The present invention configures the gyroscope program through a data acquisition processor, effectively avoiding the need for manual opening of the cover to burn the product program during the production and testing process, reducing the risk of product opening and improving production efficiency. Attached Figure Description

[0038] Figure 1This is a schematic diagram of the system structure of an automatic test system for fiber optic gyroscope gain and polarity.

[0039] Figure 2 This is a schematic diagram of the modulation and demodulation principle of a conventional angular rate measurement system for an automatic test system for fiber optic gyroscope gain and polarity.

[0040] Figure 3 This is a schematic diagram of the modulation and demodulation principle of a conventional angular gain measurement system for an automatic test system for fiber optic gyroscope gain and polarity. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings:

[0042] Appendix Figure 1 This is a schematic diagram of an automatic test system for the gain and polarity of a fiber optic gyroscope. In specific implementation, the light source 1 can be an SLD (Superluminescent Diode), the coupler 2 is a 2*2 type dual-input dual-output polarization-maintaining coupler, the light source is fused to the A1 end of the coupler 2 at 0 degrees, the detector 5 is fused to the A2 end of the coupler 2, the Y1 and Y2 ends of the Y-waveguide 3 are fused to the B1 and B2 ends of the fiber optic ring respectively, and a single end of the Y-waveguide 3 is fused to the A3 end of the fiber optic coupler 2. The MCU is a Microchip PIC32MX795F512L-80PF, the eight-channel data acquisition processor and the gain and polarity algorithm arithmetic unit are both Xilinx XC6SLX16-2CSG324I PFGA models, and the human-machine interface LCD screen is a touch screen. The human-machine interface LCD screen interacts with the MCU through an interface.

[0043] Appendix Figure 2 This is a flowchart of a method for measuring the gain and polarity of a fiber optic gyroscope. In this embodiment, the gain measurement algorithm program and the polarity measurement algorithm are stored in the FLASH memory of the data acquisition processor. When the human-machine interface LCD screen issues a test command, the MCU first reads the gain measurement algorithm program from the FLASH memory, configures it to the FPGA, and runs it. After the data acquisition processor collects and stores the gain measurement data, the MCU resets the FPGA again, reads the polarity measurement algorithm program from the FLASH memory, configures it to the FPGA, and runs it. After the data acquisition processor collects and stores the polarity measurement data, the data acquisition unit calculates the gain and polarity results and displays them on the human-machine interface LCD screen.

[0044] An automatic testing system for fiber optic gyroscope gain and polarity includes a data acquisition processor, a human-machine interface LCD screen, a fiber optic gyroscope gain and polarity algorithm processor, and a power supply; wherein:

[0045] Data acquisition processor: After receiving the test command sent by the human-machine interface LCD screen, it sequentially configures the fiber optic gyroscope gain measurement program and fiber optic gyroscope polarity measurement program to the fiber optic gyroscope gain and polarity algorithm processor under test; it receives the measurement data sent by the fiber optic gyroscope gain and polarity algorithm processor and performs calculations to obtain the gain and polarity results, and transmits them to the human-machine interface LCD screen for display.

[0046] Human-computer interaction LCD screen: Receives test commands through the LCD screen and sends them to the data acquisition processor; receives the gain and polarity results from the data acquisition processor and displays them on the LCD screen.

[0047] Fiber optic gyroscope gain and polarity algorithm processor: Receives the fiber optic gyroscope gain measurement program and fiber optic gyroscope polarity measurement program configured by the data acquisition processor, and acquires fiber optic gyroscope gain measurement data and fiber optic gyroscope polarity measurement data, and sends the data acquisition results to the data acquisition processor;

[0048] Power supply: Provides ±5V DC power to the fiber optic gyroscope and 3.3V DC power to the data acquisition processor and the human-machine interface LCD screen.

[0049] Furthermore, the data acquisition processor has eight channels, enabling simultaneous connection of eight fiber optic gyroscopes for testing. The fiber optic gyroscope gain and polarity algorithm processor includes a fiber optic gyroscope forward channel optical power gain processor, a gyroscope angular rate generator, and an automatic configuration and update controller for gain and polarity measurement algorithms. The fiber optic gyroscope forward channel optical power gain processor is used to measure the effective interference optical power of the fiber optic gyroscope's forward channel. The gyroscope angular rate generator is used to introduce a positive angular rate input by introducing a monotonic step wave signal. The automatic configuration and update controller for gain and polarity measurement algorithms receives test commands sent from the human-machine interface LCD screen and adjusts the fiber optic gyroscope... The fiber optic gyroscope gain measurement program and the fiber optic gyroscope polarity measurement program are sequentially configured to the gain and polarity algorithm processor of the fiber optic gyroscope under test. The automatic configuration and update controller for the gain and polarity measurement algorithm receives the measurement data sent by the fiber optic gyroscope gain and polarity algorithm processor, performs calculations, and sends the gain and polarity results to the human-machine interface LCD screen for display. The automatic configuration and update controller for the gain and polarity measurement algorithm includes a memory and an MCU controller. The memory enables interaction with the human-machine interface LCD screen and the reception and storage of program files and parameters. The MCU controller enables the configuration, restart, and program switching of the fiber optic gyroscope gain measurement program and the fiber optic gyroscope polarity measurement program.

[0050] An automatic testing method for the gain and polarity of a fiber optic gyroscope, comprising the following steps:

[0051] The gyroscope under test is connected to the fiber optic gyroscope gain and polarity automatic test system through the connector terminals in sequence, and the system is powered on and running.

[0052] After receiving the test command sent from the human-machine interface LCD screen, the data acquisition processor sequentially configures the stored fiber optic gyroscope gain measurement program and fiber optic gyroscope polarity measurement program to the fiber optic gyroscope gain and polarity algorithm processor.

[0053] The fiber optic gyroscope gain and polarity arithmetic unit in the fiber optic gyroscope under test runs the fiber optic gyroscope gain measurement program, obtains gain measurement data, sends it to the data acquisition processor for storage and parsing, and the gyroscope under test is reset.

[0054] The fiber optic gyroscope gain and polarity calculator runs a polarity measurement program, obtains polarity measurement data, and sends it to the data acquisition processor for storage and analysis.

[0055] The data acquisition processor processes the obtained gyroscope gain and polarity measurement results to obtain the fiber optic gyroscope forward channel gain and fiber optic gyroscope polarity, and sends them to the human-machine interface LCD screen for display.

[0056] Furthermore, the fiber optic gyroscope under test and the test system transmit data via an RS422 interface.

[0057] Furthermore, the fiber optic gyroscope gain measurement program is implemented as follows:

[0058] Introducing phase quantity ±φ based on the conventional modulation state sequence of fiber optic gyroscopes k Obtain a random modulation state sequence; the conventional modulation state sequence of the fiber optic gyroscope refers to the simulated square wave voltage sequence generated in the fiber optic gyroscope, in order to... Appear alternately in pairs, in the form: +π / 2, -π / 2, +π / 2, -π / 2, +π / 2, -π / 2, +π / 2, -π / 2....;

[0059] Introducing phase quantity The subsequent random modulation state sequence is in the form of: +π / 2, -π / 2, +(π / 2+φ k -(π / 2+φ) k ), +(π / 2-φ k -(π / 2-φ) k ), +π / 2, -π / 2...;

[0060] For +π / 2, -π / 2, +(π / 2+φ) k -(π / 2+φ) k ), +(π / 2-φ k -(π / 2-φ) k The effective interference optical power voltage signal of the fiber optic gyroscope forward channel within the random modulation state period is sequentially sampled by analog-to-digital conversion, and the sampled values ​​are marked as D1, D2, D3, D4, D5, and D6 by scaling factor values;

[0061] The forward channel gain P0 of the fiber optic gyroscope is obtained through scaling factor value conversion:

[0062]

[0063] The process is as follows:

[0064] Fiber optic gyroscope interferometer interference phase difference φ k The relationship between φ and the effective interference optical power is given by formula (1), where φ b For modulation depth, P(φ) b +φ k ) is φ b Interference phase difference φ at modulation depth k The corresponding optical power value can be calculated using a modulation and demodulation algorithm.

[0065]

[0066] In a conventional modulation state sequence, the modulation depth is Right now Where φ R The interference angular rate is caused by the external input angular rate of the gyroscope; therefore, from Equation 1, we can obtain:

[0067]

[0068]

[0069] in for The digital demodulated quantity corresponding to the modulation state is denoted as D1;

[0070] for The digital demodulation constant corresponding to the modulation state is denoted as D2;

[0071] Subtracting equation 2 from equation 3 yields equation 4:

[0072]

[0073] Similarly, a random modulation phase φ will be introduced. k The modulation state sequence + (π / 2 + φ k -(π / 2+φ) k ), +(π / 2-φ k -(π / 2-φ) k Substituting these values ​​into Equation 1, we can obtain the following:

[0074]

[0075]

[0076]

[0077]

[0078] In the formula: ΔF t-3τ ΔF t-2τ ΔF t-τ ΔF t These are the interference phase differences introduced by the external angular rate input at four adjacent modulation state times: t-3τ, t-2τ, t-τ, and t; φ k The phase variable is introduced randomly. Since the conversion time τ is usually on the order of 1 to 2 μs, ΔF can be considered as a small phase variable. t-3τ ΔF t-2τ ΔF t-τ ΔF t All are equal to and equal to the interference phase difference φ caused by the external input angular rate of the gyroscope. R , +(π / 2+φ k -(π / 2+φ) k ), +(π / 2-φ k -(π / 2-φ) k The digital demodulation constants corresponding to the modulation state are denoted as D3, D4, D5, and D6 respectively; subtracting equation 3 from equation 4 yields equation 7, and subtracting equation 5 from equation 7 yields equation 8.

[0079] D3-D4=-P0sinφ R cosφ k Equation (7)

[0080] D5-D6=P0sinφ k cosφ R -P0sinφ R cosφ k Equation (8)

[0081] Subtracting Equation 7 from Equation 8 cancels out the phase difference φ introduced by the external input angle rate. R Equation 9 can then be obtained;

[0082] P(2φ k )=(D3-D4)+(D5-D6)=P0sinφ k cosφ R Equation (9)

[0083] Combining Equation 4, we can obtain Equation 10;

[0084]

[0085] At this point, the forward channel gain P0 of the fiber optic gyroscope can be calculated.

[0086] Furthermore, the random modulation state sequence is generated by a random function generator, and the proportion of the random modulation state sequence in the fiber optic gyroscope's total modulation state sequence does not exceed 0.5%; the phase quantity range is less than

[0087] Furthermore, when generating the random modulation state sequence, flag information corresponding to the random modulation state is simultaneously assigned, including position information and modulation state information. When acquiring sampled values, the flags are judged, and if the flags meet the requirements, the corresponding sampled values ​​are processed.

[0088] Furthermore, the fiber optic gyroscope polarity measurement program is implemented as follows:

[0089] After the gyroscope under test is placed at rest, a positive phase difference signal is introduced through a gyroscope angular rate generator, based on the conventional modulation sequence of the fiber optic gyroscope, to induce this positive angular rate input. D7 is The digital demodulation constant corresponding to the modulation state, D8 is The digital demodulation constant corresponding to the modulation state is used to determine the difference between D7 and D8. If the difference is greater than 0, the fiber optic gyroscope polarity is positive; if the difference is less than 0, the fiber optic gyroscope polarity is negative.

[0090] Furthermore, the fiber optic gyroscope polarity measurement program is implemented as follows:

[0091] The phase difference signal is induced by introducing an input of an equivalent positive angular rate through a gyro angular rate generator. D9 is an introduction. The digital demodulation constant corresponding to the modulation state, where D 10 To introduce The digital demodulation constants corresponding to the modulation state, D9 and D 10 A negative difference indicates positive polarity, while a positive sign indicates negative polarity.

[0092] Example:

[0093] Appendix Figure 2 This is a schematic diagram of the modulation and demodulation principle for a conventional angular rate measurement device for automatic testing of fiber optic gyroscope gain and polarity. The modulation state sequence for conventional fiber optic gyroscope angular rate measurement is shown in Table 1. Within one demodulation cycle, by applying... The measured angular rate can be demodulated by modulating and sampling, and subtracting the odd and even values.

[0094] Based on the above principle of interferometer phase difference measurement, a gyroscope with an effective interferometric optical power of 21.2uW is used as the test object. The specific steps and data of gain measurement are described below.

[0095] Step 1: Generate the modulation state sequence shown in Table 1 in the gyroscope and apply it to the Y waveguide, where a small phase quantity is introduced. Taking π / 32, the half-cycle time of the square wave is the transit time τ = 1.2uS, and the proportion of random modulation states to the total number of modulation states is 1 / 1024.

[0096] Table 1 Modulation Sequence

[0097]

[0098] Step 2: The PFGA sequentially performs analog-to-digital conversion sampling on the detector voltage signal within the random modulation state period, and the sampled values ​​are marked as D3=1627, D4=896, D5=2035, and D6=1785.

[0099] Step 3: After subtracting the sampled values ​​of the odd and even random modulation states from the FPGA and performing integration, the gain measurement value D = (D3-D4) + (D5-D6) = 481 corresponding to the introduced π / 32 phase difference is obtained.

[0100] Step 4: Calculate the forward channel gain of the gyroscope, which is the effective interference optical power.

[0101] According to Equation 4, D1 = 625 and D2 = 623 are measured, so D1 - D2 = 2 can be calculated; according to the calculation formula, the gain P0 of the fiber optic gyroscope under test is calculated to be 22.02uW.

[0102] Figure 3 This is a schematic diagram of the modulation and demodulation principle of a conventional angular gain measurement system for an automatic test system for fiber optic gyroscope gain and polarity.

[0103] In this embodiment, a method for testing the polarity of a gyroscope is as follows:

[0104] In this embodiment, a phase difference signal is introduced to replace the one caused by the external angular rate input. The values ​​were measured as follows: D7 = 8251, D8 = 5325, and D7 - D8 = 2926.

[0105] Since the measurement result is positive and the input phase is positive, the polarity of the gyroscope under test is positive, and the result is displayed on the LCD screen.

[0106] This invention enables the gain and polarity testing of eight gyroscopes in a single operation without relying on an external turntable or other testing equipment that generates angular velocity. This significantly improves production efficiency and reduces the risk of damaging the gyroscopes during testing, laying a solid foundation for the automated mass production and testing of fiber optic gyroscopes.

[0107] The embodiments described above are merely preferred embodiments of the present invention. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solutions of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic testing system for the gain and polarity of a fiber optic gyroscope, characterized in that: Includes a data acquisition processor, a human-machine interface LCD screen, a fiber optic gyroscope gain and polarity calculator, and a power supply; among which: Data acquisition processor: After receiving the test command sent by the human-machine interaction LCD screen, it sequentially configures the fiber optic gyroscope gain measurement program and fiber optic gyroscope polarity measurement program to the fiber optic gyroscope gain and polarity calculation unit under test; it receives the measurement data sent by the fiber optic gyroscope gain and polarity algorithm calculation unit, performs analysis and processing, obtains the gain and polarity results, and transmits them to the human-machine interaction LCD screen for display. Human-computer interaction LCD screen: Receives test commands input by the user and sends them to the data acquisition processor; receives and displays the gain and polarity results from the data acquisition processor. Fiber optic gyroscope gain and polarity calculator: installed in the fiber optic gyroscope under test; runs the fiber optic gyroscope gain measurement program, collects gain measurement data and sends it to the data acquisition processor; runs the fiber optic gyroscope polarity measurement program, collects polarity measurement data and sends it to the data acquisition processor. Power supply: Provides ±5V DC power to the fiber optic gyroscope and 3.3V DC power to the data acquisition processor and the human-machine interface LCD screen; The fiber optic gyroscope gain measurement program is implemented as follows: Introducing phase quantities based on the conventional modulation state sequence of fiber optic gyroscopes Obtain a random modulation state sequence; the conventional modulation state sequence of the fiber optic gyroscope refers to an analog square wave voltage sequence, in order to... Appear alternately in pairs, in the form: +π / 2, -π / 2, +π / 2, -π / 2, +π / 2, -π / 2, +π / 2, -π / 2....; Introducing phase quantity The subsequent random modulation state sequence is in the form of: +π / 2, -π / 2, +(π / 2+ ), -(π / 2+ ), +(π / 2- ), -(π / 2- ); Less than ; +π / 2, -π / 2, +(π / 2+ ), -(π / 2+ ), +(π / 2- ), -(π / 2- This is denoted as a random modulation state period. Within this period, the effective interference optical power voltage signal of the fiber optic gyroscope forward channel corresponding to each random modulation state is acquired and converted from analog to digital to obtain the digital voltage signal quantities D1, D2, D3, D4, D5, and D6 corresponding to each random modulation state within this period. The digital voltage signal quantities D1, D2, D3, D4, D5, and D6 corresponding to each random modulation state are the gain measurement data.

2. An automatic testing method for the gain and polarity of a fiber optic gyroscope, characterized in that... include: The user inputs test commands into the human-computer interaction LCD screen, and the human-computer interaction LCD screen forwards the test commands to the data acquisition processor; After receiving the test command, the data acquisition processor will sequentially configure the stored fiber optic gyroscope gain measurement program and fiber optic gyroscope polarity measurement program to the fiber optic gyroscope gain and polarity arithmetic unit. The fiber optic gyroscope gain and polarity arithmetic unit in the fiber optic gyroscope under test runs the fiber optic gyroscope gain measurement program, obtains gain measurement data, and sends it to the data acquisition processor. The gyroscope under test is reset; The fiber optic gyroscope gain and polarity arithmetic unit runs the fiber optic gyroscope polarity measurement program, obtains polarity measurement data, and sends it to the data acquisition processor. The data acquisition processor analyzes and processes the obtained gain measurement data and polarity measurement data to obtain the forward channel gain and polarity of the fiber optic gyroscope, and sends them to the human-machine interface LCD screen for display. The fiber optic gyroscope gain measurement program is implemented as follows: Introducing phase quantities based on the conventional modulation state sequence of fiber optic gyroscopes Obtain a random modulation state sequence; the conventional modulation state sequence of the fiber optic gyroscope refers to an analog square wave voltage sequence, in order to... Appear alternately in pairs, in the form: +π / 2, -π / 2, +π / 2, -π / 2, +π / 2, -π / 2, +π / 2, -π / 2....; Introducing phase quantity The subsequent random modulation state sequence is in the form of: +π / 2, -π / 2, +(π / 2+ ), -(π / 2+ ), +(π / 2- ), -(π / 2- ); Less than ; +π / 2, -π / 2, +(π / 2+ ), -(π / 2+ ), +(π / 2- ), -(π / 2- This is denoted as a random modulation state period. Within this period, the effective interference optical power voltage signal of the fiber optic gyroscope forward channel corresponding to each random modulation state is acquired and converted from analog to digital to obtain the digital voltage signal quantities D1, D2, D3, D4, D5, and D6 corresponding to each random modulation state within this period. The digital voltage signal quantities D1, D2, D3, D4, D5, and D6 corresponding to each random modulation state are the gain measurement data.

3. The automatic testing method for fiber optic gyroscope gain and polarity according to claim 2, characterized in that: The fiber optic gyroscope under test and the data acquisition processor transmit data through an RS422 interface.

4. The automatic testing method for fiber optic gyroscope gain and polarity according to claim 2, characterized in that: The data acquisition processor performs the following analytical processing on the acquired gain measurement data to obtain the forward channel gain of the fiber optic gyroscope. : 。 5. The automatic testing method for fiber optic gyroscope gain and polarity according to claim 4, characterized in that: The random modulation state sequence is generated by a random function generator, and the random modulation state sequence of the fiber optic gyroscope accounts for no more than 0.5% of all modulation state sequences.

6. The automatic testing method for fiber optic gyroscope gain and polarity according to claim 3, characterized in that: The fiber optic gyroscope polarity measurement program is implemented as follows: A positive phase difference signal is introduced based on the conventional modulation state sequence of a fiber optic gyroscope. , obtain The fiber optic gyroscope voltage signal corresponding to the modulation state is converted from analog to digital to obtain the digital value D7 of the fiber optic gyroscope voltage signal. The fiber optic gyroscope voltage signal corresponding to the modulation state is converted from analog to digital to obtain the digital quantity D8 of the fiber optic gyroscope voltage signal. D7 and D8 are the polarity measurement data.

7. The automatic testing method for fiber optic gyroscope gain and polarity according to claim 6, characterized in that: The data acquisition processor performs the following analytical processing on the obtained polarity measurement data to obtain the polarity of the fiber optic gyroscope: Determine the difference between D7 and D8. If the difference is greater than 0, the fiber optic gyroscope is positive polarity; if the difference is less than 0, the fiber optic gyroscope is negative polarity.

8. The automatic testing method for fiber optic gyroscope gain and polarity according to claim 3, characterized in that: The fiber optic gyroscope polarity measurement program is implemented as follows: A negative phase difference signal is introduced based on the conventional modulation state sequence of a fiber optic gyroscope. , obtain The fiber optic gyroscope voltage signal corresponding to the modulation state is converted from analog to digital to obtain the digital value D9 of the fiber optic gyroscope voltage signal. The fiber optic gyroscope voltage signal corresponding to the modulation state is converted from analog to digital to obtain the digital quantity D of the fiber optic gyroscope voltage signal. 10 The D9 and D 10 This refers to polarity measurement data.

9. The automatic testing method for fiber optic gyroscope gain and polarity according to claim 8, characterized in that: The data acquisition processor performs the following analytical processing on the obtained polarity measurement data to obtain the polarity of the fiber optic gyroscope: Determine whether D9 is different from D. 10 The difference between the two values ​​is calculated. If the difference is greater than 0, the fiber optic gyroscope is negative; if the difference is less than 0, the fiber optic gyroscope is positive.

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