CN102353387B - Automated testing system and method for index parameters of fiber optic gyro - Google Patents
Automated testing system and method for index parameters of fiber optic gyro Download PDFInfo
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- CN102353387B CN102353387B CN 201110245182 CN201110245182A CN102353387B CN 102353387 B CN102353387 B CN 102353387B CN 201110245182 CN201110245182 CN 201110245182 CN 201110245182 A CN201110245182 A CN 201110245182A CN 102353387 B CN102353387 B CN 102353387B
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Abstract
The invention discloses an automated testing system and method for index parameters of a fiber optic gyro, mainly solving the problems of low testing precision, operation complexity, non-visual testing results and low automation degree of the prior art. The method comprises the following implementation processes of: (1) setting parameters of a turntable and a temperature controller; (2) favorably placing liquid nitrogen and respectively acquiring static data and dynamic data of the fiber optic gyro by taking 20 seconds as a cycle; (3) cooling to -30 DEG C and interrupting a power supply for 5min fro the fiber optic gyro; (3) restarting a test, processing data acquired in a whole testing process, and displaying and saving the processed data in the form of images; and (4) fitting the data of the fiber optic gyro and displaying a fitting result. According to the invention, precise testing data of the fiber optic gyro can be obtained, equipment is simple to operate and is feasible, the complexity in manual operation is reduced, the testing time is shortened, the high-automation testing system is realized, and the system and the method disclosed by the invention can be applied to the aerospace field and aircraft control systems.
Description
Technical field
The invention belongs to data acquisition and technical field of measurement and test, specifically a kind of optical fibre gyro index parameter automatization test system and method can be used for aerospace field and flight control system.
Background technology
Optical fibre gyro has series of advantages such as precision height, antijamming capability is strong, preheating time is short, obtained using widely in Aero-Space and other every field, it is determining aircraft navigation and attitude control accuracy, and its quality quality directly influences the reliability of flight control system.Therefore the performance parameter test of optical fibre gyro in occupation of critical role, becomes one of basic fundamental in this field, so the high-precision test macro of a cover becomes optical fibre gyro parameter testing imperative equipment for optical fibre gyro.
At present more existing optical fibre gyro parameter acquisition and test macros, as based on the optical fibre gyro test macro of USB, based on optical fibre gyro test macro of RS-232 etc., though these test macros can be finished the basic parameter test of optical fibre gyro, but all exist the some shortcomings part, though connect simple such as the optical fibre gyro test macro based on RS-232, but message transmission rate is slow, thereby makes it become the bottleneck of high speed data transfer; Though can solve the problem of transfer rate, unit interval data throughout simultaneously based on the optical fibre gyro test macro of USB, its hardware circuit is relatively complicated, and data testing accuracy is low.In addition, these two kinds of test macros also exist the another one weak point: automaticity is low, will be with manually controlling incubator and turntable, the record of test data, processing and analysis also are by manually finishing, need expend a large amount of time and do the analysis of data, cause test period operation steps more complicated, prolonged the test duration, test result is not directly perceived.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of optical fibre gyro index parameter automatization test system and method are proposed, to improve data testing accuracy, reduce manually-operated complexity, make test operation simple, shorten the time of test, improve the automaticity of test macro, intuitively show test results.
For achieving the above object, automatization test system of the present invention comprises:
Incubator turntable, signal processing unit and computing machine three parts is characterized in that:
1) the incubator turntable comprises temperature controller and turntable, and temperature controller is used for heating to optical fibre gyro, and turntable is used for providing the swing of certain angle to optical fibre gyro, obtains the movement locus of optical fibre gyro;
2) signal processing unit comprises No. four amplifiers and an A/D converter, amplifier amplifies processing with current signal, the No. of believing one side only zero, tach signal and the temperature signal of optical fibre gyro, four tunnel analog signal conversion after A/D converter will amplify are digital signal, by pci bus the described signal of optical fibre gyro are transferred to computing machine;
3) computing machine utilizes capture card to receive the optical fibre gyro signal, finishes processing, preservation, match and the demonstration of test data.
Described turntable is provided with frequency and triggers these two parameters of the number of turns that turntable rotates, according to concrete test needs, turntable frequency reference numerical value is set to 0.8Hz, and test period is 20s, trigger turntable once in each test period, the number of turns referential data that at every turn triggers the turntable rotation is set to 8.0.
The amplification that described No. four amplifiers adopt differential amplifier circuit respectively four road signals to be carried out different multiples is handled, and four tunnel simulating signals after the amplification utilize 16 A/D converter to be converted to digital signal, have guaranteed the precision of image data.
For achieving the above object, automated testing method of the present invention comprises the steps:
1) frequency that turntable is set is 0.8Hz, to trigger the number of turns be 8.0 and the initial temperature-35 of temperature controller ℃, stop temperature+80 ℃ and 1.5 °/min of temperature rate-of-rise; Open the test interface of computing machine, optical fibre gyro numbering is set, temperature and deposit path begin to heat up;
2) optical fibre gyro is fixed on the turntable, place liquid nitrogen and make the optical fibre gyro cooling gradually, sampling rate with 2.5KHz is gathered the static No. of believing one side only zero, quiescent current signal, temperature signal and the dynamic calibration factor of optical fibre gyro output, obtains one group of test data in each test period;
When 3) temperature when optical fibre gyro drops to-30 ℃, stop operating to optical fibre gyro outage and control turntable, interrupt test, when the temperature of outage 2 minutes or optical fibre gyro drops to-35 ℃, begin to heat to optical fibre gyro, cut off the power supply 5 minutes the time, restore electricity and recover turntable and rotate to optical fibre gyro, again be that the cycle continuation is inclined to one side to the static state zero of optical fibre gyro output with 20s, quiescent current, temperature and dynamic calibration factor are gathered, and will cut off the power supply before test data and power on after test data with real-time being presented on the same interface of the form of figure, be kept at simultaneously the deposit path in;
4) when temperature be raised to+70 ℃ the time, stop to heat to optical fibre gyro, continue test after two minutes, obtain in the whole test process optical fibre gyro static zero partially, quiescent current and dynamic calibration factor test data, and these test datas are carried out match respectively, draw optical fibre gyro static zero partially, quiescent current and the dynamic match value of calibration factor;
5) test data and its match value of optical fibre gyro are asked poor, and come out with diagrammatic representation, show in the whole test process optical fibre gyro static zero partially, quiescent current and the dynamic fluctuation size of calibration factor, end of test (EOT).
The present invention has following advantage:
1) in the optical fibre gyro data acquisition, the present invention is owing to be a test period with 20s, in each test period, finish the collection of and dynamic data static to optical fibre gyro, every data acquisition multiple spot, finally draw a mean value as the optical fibre gyro data in this cycle, and the data of optical fibre gyro have been carried out cubic fit, improved the precision of test data.
2) outage and the last electric control of the rotation of the intensification control of incubator, turntable control and optical fibre gyro all realize in software among the present invention, the preservation of optical fibre gyro test data, processing and analysis, all finished by computing machine, reduce manually-operated complexity, improved the automaticity of test macro.
3) the present invention is because in the design of incubator and turntable, be made as incubator turntable frequency and the rotation number of turns adjustable, has the bigger dirigibility that cooperates with software, simultaneously because with the initial temperature of temperature controller, stop temperature and climbing speed also is made as adjustable, the each setting finished afterwards preservation automatically, make test operation simple, and shortened the test duration.
4) test data of optical fibre gyro and match value show in two assistant figures respectively among the present invention, the test result intuitive display.
Description of drawings
Fig. 1 is the theory diagram of system of the present invention;
Fig. 2 is the overall flow figure of the inventive method;
Fig. 3 is the process flow diagram of single test period among the present invention;
Fig. 4 is the main interface of the test of the inventive method;
Fig. 5 is the data fitting interface of the inventive method;
Fig. 6 is that test No. of the present invention is the test result figure of 09361 optical fibre gyro;
Fig. 7 is that test No. of the present invention is the fitted figure of 09361 optical fibre gyro data.
Embodiment
Describe the present invention below in conjunction with accompanying drawing:
With reference to Fig. 1, test macro of the present invention comprises incubator turntable, signal processing unit and computing machine three parts.Wherein the incubator turntable is made up of temperature controller and turntable, turntable be fixed on temperature controller above, be used for providing the rotation of certain angle to optical fibre gyro, the relation that the output voltage values of optical fibre gyro is directly proportional with the rotating speed of turntable, therefore the voltage swing correspondence of the optical fibre gyro that collects the height of rotating speed, when rotating speed is sinusoidal variations, the voltage that obtains also is sinusoidal variations, when turntable trigger at every turn rotate finish after, obtain sinusoidal area, thereby draw the calibration factor of optical fibre gyro, be transferred to optical fibre gyro owing to add the heat that thermoelectric perpetual motion machine sends by turntable, the temperature of turntable has also just reflected the temperature of optical fibre gyro, fixed a temperature sensor at turntable in the design, be used for gathering the temperature value of optical fibre gyro, temperature sensor in this example adopts AD590, but be not limited thereto model, turntable is provided with frequency and triggers these two parameters of the number of turns that turntable rotates, the frequency control turntable of turntable rotates the time that a week needs, the number of turns that triggers the turntable rotation determines the number of turns that turntable rotates in single test period, different according to the difference of optical fibre gyro model and concrete test request, can regulate these two parameters, in this example, turntable frequency numerical value is set to 0.8Hz, test period is 20s, triggers turntable once in each test period, and the number of turns that at every turn triggers the turntable rotation is set to 8.0 circles; Temperature controller mainly is made of a motor, finish to optical fibre gyro and heat, guarantee optical fibre gyro temperature can from-35 ℃ rise to+70 ℃, the simultaneous temperature controller can also show the current temperature value of turntable, the temperature test value of this temperature value and optical fibre gyro is compared, can watch the temperature test value of optical fibre gyro whether normal at any time, in addition, temperature controller is provided with initial temperature, stop three parameters of temperature and temperature rate-of-rise, initial temperature is a reference value, when beginning to heat, this numerical value can approach actual temperature fast, stop the maximum temperature that the temperature controlled optical fiber gyro can be heated to, temperature rate-of-rise determines the rising speed of optical fibre gyro temperature in the whole temperature-rise period, different according to the difference of optical fibre gyro model and concrete test request, can regulate these three parameters, in this example, the initial temperature of temperature controller is set to-35 ℃, stop temperature being set to+80 ℃, temperature rate-of-rise is set to 1.5 °/min, and when having only initial temperature to approach actual temperature value, programming rate just can at the uniform velocity heat up with the 1.5 °/min of speed that arranges.
Signal processing unit, comprise: the amplification of optical fibre gyro signal, analog to digital conversion and three parts of interface control circuit, the amplification of optical fibre gyro signal adopts four road differential amplifier circuits to realize, amplifier in this example adopts four difference to import the instrument operational amplifier A D8221 of single-ended output, but be not limited thereto model, its enlargement factor is to be determined by 2 pins of amplifier and the size of the resistance value between 3 pins; 16 bit resolutions are adopted in digital-to-analog conversion, the A/D converter of the above sampling rate of 200K is converted to digital signal with amplified analog signal, 16 bit resolutions have guaranteed the precision of voltage measurement, the above sampling rate of 200K can satisfy the demand of high speed acquisition multiple averaging, owing to adopt an A/D converter, increase an analog switch, four road signal time-sharing multiplexs in the design, select to import the signal that is converted by analog switch, select one the road to change at every turn; Interface control circuit is sent heating and is started the control signal that turntable rotates by the 89C51 single-chip microcomputer, the turntable that wherein sends rotates exports to turntable after control signal is isolated through photoelectricity, guaranteed the isolation of ground wire between turntable and the product like this, the control signal of heating is transferred to the heating of temperature controller control optical fibre gyro, and power on and the power operation of optical fibre gyro also is to send high-low level control by single-chip microcomputer.
Adopt the 33MHz clock between computing machine and the signal processing unit, the pci interface bus of 32bit connects, pci interface bus data transport tape is roomy, identical data volume bus holding time is short, the utilization factor height of processor, with capture card signal processing unit is gathered by the optical fibre gyro data that pci bus transmits, gathered the optical fibre gyro data of coming the most at last and be presented on the display of computing machine, and be kept in the computing machine.
With reference to Fig. 2, test of the present invention comprises the steps:
Before beginning measuring fiber gyro data, in order to satisfy the demand of test, must set parameter at Liang Chu, one place is the setting of incubator parameter, the parameter of clicking main interface, incubator turntable left side arranges button, needs according to software, the turntable frequency is set, and it is 0.8Hz that this example is established the turntable frequency, when turntable triggers at every turn, the turntable swing number of turns is 8 circles, the initial temperature of temperature controller, stop temperature and temperature rate-of-rise and also will arrange, can carry out the setting of different numerical value as required, this example arranges initial temperature and is-35 ℃, stop temperature and be+70 ℃, temperature rate-of-rise is 1.5 °/min; Another place be on the main interface of the test of opening input optical fibre gyro numbering, temperature and deposit path begin to heat up, the image data of each optical fibre gyro can be kept at after gathering end in the own txt document that selects under the deposit path, the time name that the name of document begins to test with numbering and this optical fibre gyro of optical fibre gyro, can preserve for a long time, also convenient checking the optical fibre gyro data later on.
Optical fibre gyro is fixed on the turntable, place liquid nitrogen at incubator, the size of amount of liquid nitrogen is measured according to the needs of optical fibre gyro cooling, to guarantee in this example that optical fibre gyro can cool to-30 ℃, according to test of many times checking, placing amount of capacity at incubator is that four glasss of liquid nitrogen of 150ml can meet the demands, finished above-mentioned all preliminary works after, begin to measure, carry out according to each cycle during measurement.
As shown in Figure 3, in each test period, with preceding 6s gather optical fibre gyro static zero partially, quiescent current and temperature value, the calibration factor value of ensuing 10s measuring fiber gyro, carry out the sampling of gyro output with high-speed sampling rate 2.5KHz, in each test period, optical fibre gyro static zero partially, quiescent current, temperature and calibration factor gather 2500 points respectively, these four groups of 2500 points are averaged respectively, obtain described four data, respectively as the numerical value of optical fibre gyro parameters in this cycle.
In test process, whether the software temperature of detection fiber gyro always arrives-30 ℃ that configure before beginning to test, drop to-30 ℃ in case detect the temperature of optical fibre gyro, control circuit sends a low level to relay, relay stops the power supply to optical fibre gyro, and stop the rotation of turntable, when outage 2 minutes or temperature drop to-35 ℃, start heating, be for when reaching 5 minutes at power-off time, make the optical fibre gyro temperature can go back up to about-30 ℃, guarantee the optical fibre gyro static zero of continuation measurement partially as far as possible, quiescent current and dynamic calibration factor value are continuous with the preceding measured value that cuts off the power supply, make that follow-up fitting result is more accurate, when outage 5 minutes the time, restore electricity and recover turntable and rotate to optical fibre gyro, with 20s be again continue in the cycle to optical fibre gyro output static zero partially, quiescent current, temperature and dynamic calibration factor are gathered, in 5 fens clock times of outage, only gather and preserve the temperature value of optical fibre gyro;
Show the interface of test data as shown in Figure 4, because the direct parameter of optical fibre gyro is not the main contents of checking, what pay close attention to is optical fibre gyro static parameter and the fluctuation size of dynamic parameter in whole test process, curve 1 among Fig. 4 a, 2,3,4 represent the dynamic calibration factor of optical fibre gyro in the whole test process respectively, static zero partially, quiescent current, the instantaneous value of temperature and the difference of initial value are with respect to the Changing Pattern of time, curve 1 among Fig. 4 b, 2,3 represent the dynamic calibration factor of optical fibre gyro in the whole test process respectively, static zero partially, the instantaneous value of quiescent current and the difference of initial value are with respect to the variation of temperature rule, what show in the left and right sides of Fig. 4 a and Fig. 4 b is the size of optical fibre gyro parameters difference, W wherein, mV, I, mA, T, ℃, S, mV/./ s represent respectively optical fibre gyro static zero partially, quiescent current, temperature and dynamic calibration factor, what preserve in the document under the deposit path is the original value of the every data of optical fibre gyro.
When the optical fibre gyro temperature rise to+70 ℃ the time, in order to make the test data of optical fibre gyro more accurate, our design stops the heating to optical fibre gyro when arriving+70 ℃, continue to be incubated two minutes and the optical fibre gyro data are tested, obtain after two minutes in the whole test process optical fibre gyro static zero partially, quiescent current and dynamic calibration factor test data, and these test datas are carried out match respectively, fitting formula is as follows:
y
1＝a
1x
3+b
1x
2+c
1x+d
1
y
2＝a
2x
3+b
2x
2+c
2x+d
2
y
3＝a
3x
3+b
3x
2+c
3x+d
3
X representation temperature wherein, y
1Represent static zero partially, a
1, b
1, c
1, d
1Represent static zero three rank, second order, single order, the zeroth order number of times of temperature during match partially respectively, y
2Represent quiescent current, a
2, b
2, c
2, d
2Three rank of temperature, second order, single order, zeroth order number of times when representing the quiescent current match respectively, y
3Represent calibration factor, a
3, b
3, c
3, d
3Three rank of temperature, second order, single order, zeroth order number of times when representing the calibration factor match respectively;
Result after the match as shown in Figure 5, among Fig. 5 a the 1st, 2, dotted line in the 3 suite lines represents the dynamic calibration factor of optical fibre gyro respectively, static zero partially, the difference of quiescent current and initial value separately is with respect to variation of temperature, the 1st, 2, solid line in the 3 suite lines represents the dynamic calibration factor of optical fibre gyro respectively, static zero partially, the fitting result of quiescent current and initial value difference separately is with respect to variation of temperature, among Fig. 5 b 1,2, article 3, curve represents the optical fibre gyro quiescent current respectively, static zero partially, dynamically before the calibration factor match and the difference size after the match with respect to variation of temperature, Bias among the figure, SF, Isld represent the static partially zero of optical fibre gyro respectively, dynamic calibration factor and quiescent current.
Step 6, reappear the fine gyro data of photometry.
As shown in Figure 4, before beginning measuring fiber gyro data, test main interface and be written into file button, the main effect that increases this function is: the optical fibre gyro data that will test complete preservation are got off, as long as the test data of certain optical fibre gyro is arranged, just can at any time be written into into the form of figure these optical fibre gyro data are observed, whether meet the requirements of performance index to determine it, also can carry out process of fitting treatment to its data by repeating step 5.
Effect of the present invention can further specify by following test case result.
1) frequency that turntable is set is 0.8Hz, to trigger the number of turns be 8.0, the initial temperature of temperature controller-35 ℃, stop temperature+80 ℃, 1.5 °/min of temperature rate-of-rise, open the test interface of computing machine, input optical fibre gyro numbering 09361, the temperature-30 ℃ of beginning to heat up, deposit path D: dat;
09361 optical fibre gyro that 2) will be numbered is fixed on the turntable, and at the liquid nitrogen of four glasss of 150ml of incubator placement, beginning optical fibre gyro is that one-period is tested with 20s, and each test period obtains one group of test data;
3) when temperature drops to-30 ℃, cut off the power supply to optical fibre gyro, stop to test the optical fibre gyro data except temperature, when outage two minutes or temperature drop to-35 ℃, begin heating to optical fibre gyro, when outage 5 minutes the time, recover the power supply of optical fibre gyro, be to continue in the cycle optical fibre gyro is tested again with 20s;
4) when temperature arrives 70 ℃, stop the heating of optical fibre gyro, continued test data two minutes, finish this test, obtain test result as shown in Figure 6, wherein Fig. 6 a be optical fibre gyro static zero partially, dynamically calibration factor, quiescent current, temperature in whole test process with the variation with respect to the time of the difference of initial value, Fig. 6 b be optical fibre gyro static zero partially, dynamically calibration factor, quiescent current and initial value difference be with respect to variation of temperature.
As seen from Figure 6: five minutes control of optical fibre gyro outage and startup are heated, are restored electricity, and the tests in two minutes after stopping at last heating all match with design of the present invention.
The test data of optical fibre gyro shown in Fig. 6 is carried out match, obtain data fitting result as shown in Figure 7, wherein the curve 1,2,3 among Fig. 7 a show respectively the dynamic calibration factor of optical fibre gyro, static zero partially, the fitting result of quiescent current, the curve 1,2,3 among Fig. 7 b demonstrate respectively optical fibre gyro static zero partially, quiescent current, the dynamic difference before and after the calibration factor match.
As seen from Figure 7: static zero partial wave of optical fibre gyro is moving to be 0.051311mV, dynamically the calibration factor fluctuation is 22.533486 for 0.176379mV/ °/s, quiescent current fluctuation, static zero-deviation value is 0.036585mV, dynamically the calibration factor difference is that 0.028609mV/ °/s, quiescent current difference are 1.065293, the fluctuation size that can draw optical fibre gyro parameters in whole test process by above-mentioned numerical value is within allowed band, and this fiber optic gyroscope performance is up to standard;
More than comprehensive, no matter the present invention on objective indicator still is subjective effect, has shown preferable performance, when gathering the optical fibre gyro data accurately, intuitively the form of parameters with figure is showed, and has realized the test macro of high automation.
Claims (3)
1. an optical fibre gyro index parameter automated testing method comprises the steps:
1) frequency that turntable is set is 0.8Hz, to trigger the number of turns be 8.0 and the initial temperature-35 of temperature controller ℃, stop temperature+80 ℃ and 1.5 °/min of temperature rate-of-rise; Open the test interface of computing machine, optical fibre gyro numbering is set, temperature and deposit path begin to heat up;
2) optical fibre gyro is fixed on the turntable, place liquid nitrogen and make the optical fibre gyro cooling gradually, sampling rate with 2.5kHZ is gathered the static No. of believing one side only zero, quiescent current signal, temperature signal and the dynamic calibration factor of optical fibre gyro output, obtains one group of test data in each test period;
When 3) temperature when optical fibre gyro drops to-30 ℃, stop operating to optical fibre gyro outage and control turntable, interrupt test, when the temperature of outage 2 minutes or optical fibre gyro drops to-35 ℃, begin to heat to optical fibre gyro, cut off the power supply 5 minutes the time, restore electricity and recover turntable and rotate to optical fibre gyro, again be that the cycle continuation is inclined to one side to the static state zero of optical fibre gyro output with 20s, quiescent current, temperature and dynamic calibration factor are gathered, and will cut off the power supply before test data and power on after test data with real-time being presented on the same interface of the form of figure, be kept at simultaneously the deposit path in;
4) when temperature be raised to+70 ℃ the time, stop to heat to optical fibre gyro, continue test after two minutes, obtain in the whole test process optical fibre gyro static zero partially, quiescent current and dynamic calibration factor test data, and these test datas are carried out match respectively, draw optical fibre gyro static zero partially, quiescent current and the dynamic match value of calibration factor;
5) test data and its match value of optical fibre gyro are asked poor, and come out with diagrammatic representation, show in the whole test process optical fibre gyro static zero partially, quiescent current and the dynamic fluctuation size of calibration factor, end of test (EOT).
2. optical fibre gyro index parameter automated testing method according to claim 1, it is characterized in that: in the test period of each 20s, with preceding 6s gather optical fibre gyro static zero partially, quiescent current and temperature value, next 10s control incubator turntable rotates 8 circles, obtain dynamic calibration factor value, last 4s deal with data after rotating end.
3. optical fibre gyro index parameter automated testing method according to claim 1, it is characterized in that: step (4) is described carries out match respectively to test data, is to carry out according to following formula:
y
1＝a
1x
3+b
1x
2+c
1x+d
1
y
2＝a
2x
3+b
2x
2+c
2x+d
2
y
3＝a
3x
3+b
3x
2+c
3x+d
3
X representation temperature wherein, y
1Represent static zero partially, a
1, b
1, c
1, d
1Represent static zero three rank, second order, single order, the coefficient of zero order of temperature during match partially respectively, y
2Represent quiescent current, a
2, b
2, c
2, d
2Three rank, second order, single order, the coefficient of zero order of temperature when representing the quiescent current match respectively, y
3Represent calibration factor, a
3, b
3, c
3, d
3Three rank, second order, single order, the coefficient of zero order of temperature when representing the calibration factor match respectively.
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