CN110375788B - Four-way orthogonal differential signal demodulation instrument calibration method and system - Google Patents
Four-way orthogonal differential signal demodulation instrument calibration method and system Download PDFInfo
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Abstract
The invention discloses a calibration method and a calibration system for a four-way quadrature differential signal demodulation instrument, and belongs to the field of demodulation instrument metering. The invention synchronously connects the master signal generator and the slave signal generator in the standard signal generating system; correspondingly connecting the output channels of the master signal generator and the slave signal generator to the channel of the calibrated object; according to the requirement of the output signal of the calibrated object, the waveform, single period, amplitude, bias voltage parameter and initial phase of the main signal generator channel 1 and the channel 2 are set, and the waveform, single period, amplitude, bias voltage parameter and initial phase of the auxiliary signal generator channel 3 and the channel 4 are set. The number of trigger cycles is set according to the angle alpha or length l of the desired change, respectively. The period T is set. And outputting a standard value every time the trigger key is pressed down by the main signal generator, simultaneously recording a solution value of the calibrated object, calculating the difference between the solution value of the calibrated object and the standard value to obtain the measurement error of the calibrated object, and realizing the calibration of the four-way quadrature differential signal demodulator.
Description
Technical Field
The invention relates to a calibration method and a calibration system for a four-way quadrature differential signal demodulation instrument, and belongs to the field of demodulation instrument metering.
Background
The device such as grating, encoder, etc. used in large amount in displacement and angle measurement adopts imaging scanning principle or interference scanning principle to make motion measurement, and outputs 4 paths of electric signals, and their phase difference is 90 deg. electronic angle, and adopts signal demodulation instrument to demodulate them so as to obtain the measurement result of displacement or angle. The measurement result has errors of etching, manufacturing and the like of the grating and the encoder, and errors of components, algorithms and the like of the demodulation instrument.
Disclosure of Invention
The invention discloses a calibration method and a system for a four-way quadrature differential signal demodulation instrument, which aim to solve the technical problems that: and the calibration of the four-path orthogonal differential signal demodulation instrument is realized.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a calibration method for a four-way orthogonal differential signal demodulation instrument, which comprises the following steps:
the method comprises the following steps: and installing a four-way quadrature differential signal demodulation instrument calibration system and connecting the four-way quadrature differential signal demodulation instrument calibration system with a calibrated instrument or a board card.
Synchronously connecting a master signal generator and a slave signal generator in a standard signal generation system; and correspondingly connecting output channels of the master signal generator and the slave signal generator to a channel of the calibrated instrument.
Step two: setting main signal generator parameters.
The reference output end of the main signal generator is connected to the external input reference end of the slave signal generator, the trigger is set to be ON, the system sets fixed MHz Ref to be automatically closed according to the use requirement, and the source is set to be internal. According to the signal requirement of the calibrated instrument or the board card, parameters of two channels of the signal generator are respectively set, and the parameter of the channel 1 is set: waveform, period, amplitude, offset parameter, number of trigger cycles, initial phase; the waveform, period, amplitude, offset parameters, and number of trigger cycles for channel 2 are set, and channel 2 is set to have the same parameters as channel 1, the phase of channel 1 is set to 0 °, and the phase of channel 2 is set to 90 °. The number of the cycles is determined according to the number of the demodulated signals of the calibrated instrument or the board card and the angle size set during calibration.
Preferably, the 10MHz reference output terminal of the master signal generator is connected to the external input reference terminal of the slave signal generator, the trigger is set to ON, the 10MHz Ref is set to be automatically closed, and the source is set to internal.
Step three: the slave signal generator parameters are set.
The operation mode of the signal generator is set as trigger, the signal source selects external, the system selects external trigger, and the synchronous reference clock is set as external. The waveform, period, amplitude, offset parameter, and number of trigger cycles of channel 3 and channel 4 are set, respectively, and the above parameters are set to be the same as channel 1 in step two, the phase of channel 3 is set to 180 °, and the phase of channel 4 is set to 270 °.
Step four: the period T is set.
The period T is set according to the frequency f of the response of the calibrated instrument or the board card, and the following relation is satisfied:
step five: the number of trigger cycles M is determined.
When the number of lines of the circular grating calculated by the calibration instrument or the board card is N/circle, the number of lines of the grating corresponding to each degree is N/360, and the required rotation angle is alpha degree, the number of trigger cycles M is calculated according to the following formula.
When the line number of the long grating calculated by the calibration instrument or the board card is N/mm, the corresponding line number of the grating per meter is 1000N, and the movement length is l meters, the trigger cycle number M is calculated according to the following formula.
M＝1000l·N
Because the signal generator only gives an integer waveform, when the total number of lines of one circle of the resolved grating of the calibrated instrument or the board card is N, the angle measurement resolution eta which can be given is as follows:
wherein:
p-signal period, unit: "A", "an
η — resolution, unit: "A", "an
N-total number of lines in one (360 °) revolution of the grating.
Similarly, when the calibrated instrument or board card is used for resolving the length grating, when the line number of the grating is N/mm, the length measurement resolution Q that can be given is:
wherein:
γ -signal period, unit: mum of
Q-resolution, unit: mum of
N-total number of lines scribed over a length of 1 mm.
Step six: and respectively setting the waveform, single period, amplitude, bias voltage parameters and initial phase of the channel 1 and the channel 2 of the main signal generator according to the requirement of the output signal of the calibrated instrument according to the step two. And respectively setting the waveform, single period, amplitude, bias voltage parameter and initial phase of the channel 3 and the channel 4 of the slave signal generator according to the third step. And respectively setting the number of trigger cycles according to the second step and the third step according to the angle alpha or the length l which needs to be changed. And setting a period T according to the step four. The number of trigger cycles M is determined according to step five. And outputting a standard value every time the trigger key is pressed down by the main signal generator, simultaneously recording a solution value of the calibrated object, calculating the difference between the solution value of the calibrated object and the standard value, and obtaining the measurement error of the calibrated object, namely obtaining the calibration result of the four-way quadrature differential signal demodulator.
The standard value is an angle alpha or a length l. The calibrated instrument solution is either angle α 'or length l'.
In the sixth step, the calibration result of the four-path orthogonal differential signal demodulator is represented by the following formula:
ei＝αi′-αi
ei-error deviation measured at the ith angle or length, in units of: "μm";
αi' -the i-th angle or length value demodulated by the calibrated instrument, in units: "μm";
αi-the ith standard angle or length value given by the standard system, in units of: "μm";
angle or length reading error:
the calibrated object comprises a calibrated instrument or a board card.
The signal generator comprises a master signal generator and a slave signal generator.
The invention also discloses a calibration system of the four-way orthogonal differential signal demodulation instrument for realizing the calibration method of the four-way orthogonal differential signal demodulation instrument, which comprises a standard signal generating subsystem and two double-channel high-precision signal generators, wherein the calibrated object is a calibrated instrument or a board card. The standard signal generation subsystem is used for generating a standard four-way orthogonal differential signal and comprises a master signal generator and a slave signal generator. Two double-channel high-precision signal generators are used for generating standard four-way differential signals.
Synchronously connecting a master signal generator and a slave signal generator in a standard signal generation system; correspondingly connecting output channels of the master signal generator and the slave signal generator to a channel of a calibrated object; and respectively setting the waveform, single period, amplitude, bias voltage parameter and initial phase of the channel 1 and the channel 2 of the main signal generator according to the requirement of the output signal of the calibrated object. And respectively setting the waveform, single period, amplitude, bias voltage parameter and initial phase of the channel 3 and the channel 4 of the slave signal generator according to the third step. And determining the triggering cycle number M according to the steps two, three and five according to the angle alpha or the length l to be changed. And setting a period T according to the step four. And outputting a standard value every time the trigger key is pressed down by the main signal generator, simultaneously recording the solution value of the calibrated object, and calculating the difference between the solution value of the calibrated object and the standard value to obtain the measurement error of the calibrated object.
Has the advantages that:
the invention discloses a calibration method and a system for a four-way orthogonal differential signal demodulation instrument, wherein a master signal generator and a slave signal generator in a standard signal generation subsystem are synchronously connected; correspondingly connecting output channels of the master signal generator and the slave signal generator to a channel of a calibrated object; and respectively setting the waveform, single period, amplitude, bias voltage parameter and initial phase of the channel 1 and the channel 2 of the main signal generator according to the requirement of the output signal of the calibrated object. And respectively setting the waveform, single period, amplitude, bias voltage parameter and initial phase of the channel 3 and the channel 4 of the slave signal generator according to the third step. And respectively setting the number of trigger cycles according to the second step and the third step according to the angle alpha or the length l which needs to be changed. And setting a period T according to the step four. The number of trigger cycles M is determined according to step five. And outputting a standard value every time the trigger key is pressed down by the main signal generator, simultaneously recording a solution value of the calibrated object, calculating the difference between the solution value of the calibrated object and the standard value, and obtaining the measurement error of the calibrated object, namely, calibrating the four-way quadrature differential signal demodulation instrument by adopting a universal instrument.
Drawings
FIG. 1 is a block diagram of a four-way quadrature differential signal demodulation instrument calibration system disclosed in the present invention;
fig. 2 is a flowchart of a calibration method for a four-way quadrature differential signal demodulation instrument according to the present invention.
Detailed Description
For a better understanding of the objects and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1:
the calibration method for the four-path orthogonal differential signal demodulation instrument disclosed by the embodiment is characterized in that the instrument to be calibrated is a certain type photoelectric coded disc detector, the input signal required by the instrument is 4 paths of grating signals with 90-degree difference, 2.5V is taken as the central level, the peak-to-peak (p-p) value is more than or equal to 3V and less than or equal to 4V, the signal frequency is not more than 540K, and the rotating speed of 6480 wire/ring grating is not more than 30 degrees/s. The calibration procedure is shown in fig. 2.
The method for calibrating the four-path orthogonal differential signal demodulation instrument disclosed by the embodiment comprises the following specific implementation steps:
the method comprises the following steps: synchronously connecting a master signal generator and a slave signal generator in a standard signal generation system;
step two: the output channels of the main signal generator and the slave signal generator are correspondingly connected to the channel of the photoelectric code disc detector.
Wiring according to fig. 1;
step three: setting main signal generator parameters.
The 10MHz reference output end of the back panel of the main signal generator is connected to the external input reference end of the slave signal generator, the trigger is set to be ON, the system sets 10MHz Ref to be automatically closed, and the source is set to be internal.
Setting the parameters of the main signal generator channel 1: the waveform is a sine signal, the period is 10ms, and the amplitude is 1.75VP-PBias parameter 1.25V, number of trigger cycles 540, initial phase 0 °;
setting the parameters of the main signal generator channel 2: the waveform is a sine signal, the period is 10ms, and the amplitude is 1.75VP-PBias parameter 1.25V, number of trigger cycles 540, initial phase 90 °;
the period T is set according to the frequency f of the response of the calibrated instrument or the board card, and the following relation is satisfied:
the frequency of the corrected signal is not more than 540K, and the period is 10ms
The number of lines of the circular grating measured by the photoelectric code disc detector is 6480/circle, the number of lines of the grating corresponding to each degree is 6480/360 degrees, and when the rotation angle is 30 degrees, the triggering cycle number M is calculated according to the following formula.
Because the signal generator only gives an integer waveform, when the total number of lines of one circle of resolved grating of the photoelectric code disc detector is 6480, the angle measurement resolution eta which can be given is as follows:
step four: the slave signal generator parameters are set.
The operation mode of the slave signal generator is set as trigger, the signal source selects the outside, the system selects the outside, and the synchronous reference clock is set as the outside.
Setting parameters of the slave signal generator channel 3: the waveform is a sine signal, the period is 10ms, and the amplitude is 1.75VP-PBias parameter 1.25V, trigger cycle number 540, initial phase 180 °
Setting parameters of the slave signal generator channel 4: the waveform is a sine signal, the period is 10ms, and the amplitude is 1.75VP-PBias parameter 1.25V, trigger cycle number 540, initial phase 270 °
Step five: the measurement is started.
Step six: and recording and calculating the calibration result of the photoelectric encoder detector, and calculating the difference between the calculation value of the calibrated object and the standard value according to the table 1 to obtain the measurement error of the calibrated object, namely the calibration result of the four-way quadrature differential signal demodulator.
TABLE 1 calibration results of photoelectric encoder detector
As shown in fig. 2, the present embodiment further discloses a calibration system for a four-way quadrature differential signal demodulation instrument, which is used for implementing the calibration method for a four-way quadrature differential signal demodulation instrument, and includes a standard signal generation subsystem and two dual-channel high-precision signal generators, where a calibrated object is an instrument or a board card to be calibrated. The standard signal generation subsystem is used for generating a standard four-way orthogonal differential signal and comprises a master signal generator and a slave signal generator. Two double-channel high-precision signal generators are used for generating standard four-way differential signals.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A calibration method for a four-way quadrature differential signal demodulation instrument is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the method comprises the following steps: installing a four-way orthogonal differential signal demodulation instrument calibration system and connecting the four-way orthogonal differential signal demodulation instrument calibration system with a calibrated instrument;
synchronously connecting a master signal generator and a slave signal generator in a standard signal generation system; correspondingly connecting output channels of the master signal generator and the slave signal generator to a channel of the calibrated instrument;
step two: setting main signal generator parameters;
connecting the output reference end of the main signal generator to the external input reference end of the slave signal generator, triggering to be ON, automatically closing the system by setting fixed MHz Ref according to the use requirement, and setting the source to be internal; according to the signal requirement of the calibrated instrument or the board card, parameters of two channels of the signal generator are respectively set, and the parameter of the channel 1 is set: waveform, period, amplitude, offset parameter, number of trigger cycles, initial phase; setting the waveform, period, amplitude, offset parameters and trigger cycle number of a channel 2, wherein the parameters of the channel 2 are the same as those of the channel 1, the phase of the channel 1 is set to be 0 degrees, and the phase of the channel 2 is set to be 90 degrees; the number of the cycles is determined according to the number of demodulated signals of the calibrated instrument or the board card and the size of an angle set during calibration;
step three: setting slave signal generator parameters;
setting the operation mode of a signal generator as trigger, selecting an external signal source, selecting the external trigger by a system, and setting a synchronous reference clock as the external; respectively setting the waveform, the period, the amplitude, the offset parameter and the trigger cycle number of the channel 3 and the channel 4, wherein the parameters are the same as those of the channel 1 in the step two, the phase of the channel 3 is set to be 180 degrees, and the phase of the channel 4 is set to be 270 degrees;
step four: setting a period T;
the period T is set according to the frequency f of the response of the calibrated instrument or the board card, and the following relation is satisfied:
step five: determining the number M of trigger cycles;
when the line number of the circular grating resolved by the calibration instrument or the board card is N/circle, the corresponding line number of the grating per degree is N/360, and the required rotation angle is alpha degree, the triggering cycle number M is calculated according to the following formula;
when the line number of the long grating resolved by the calibration instrument or the board card is N/mm, the corresponding grating line number per meter is 1000. N, and the movement length is l meters, the trigger cycle number M is calculated according to the following formula;
M＝1000·l·N
because the signal generator only gives an integer waveform, when the total number of lines of one circle of the resolved grating of the calibrated instrument or the board card is N, the angle measurement resolution eta which can be given is as follows:
wherein:
p-signal period, unit: "A", "an
η — resolution, unit: "A", "an
N is the total number of lines of 360 degrees in one circle of the grating;
similarly, when the calibrated instrument or board card is used for resolving the length grating, when the line number of the grating is N/mm, the length measurement resolution Q that can be given is:
wherein:
γ -signal period, unit: mum of
Q-resolution, unit: mum of
N-total number of scribed lines over a length of 1 mm;
step six: respectively setting the waveform, single period, amplitude, bias voltage parameters and initial phase of the channel 1 and the channel 2 of the main signal generator according to the requirement of the output signal of the calibrated instrument; respectively setting the waveform, single period, amplitude, bias voltage parameters and initial phase of the slave signal generator channel 3 and the channel 4 according to the third step, and determining the number M of trigger cycles according to the second step, the third step and the fifth step according to the angle alpha or the length l which needs to be changed; setting a period T according to the fourth step; outputting a standard value every time a trigger key is pressed down by a main signal generator, simultaneously recording a solution value of a calibrated object, calculating the difference between the solution value of the calibrated object and the standard value to obtain a measurement error of the calibrated object, and obtaining a calibration result of the four-way quadrature differential signal demodulator;
the standard value is an angle alpha or a length l; the calibrated instrument solution is either angle α 'or length l'.
2. The calibration method for the four-way quadrature differential signal demodulation instrument of claim 1, wherein: in the sixth step, the calibration result of the four-path orthogonal differential signal demodulator is represented by the following formula:
ei＝α′i-αi
ei-error deviation measured at the ith angle or length, in units of: "or μm;
α′i-the i-th angle or length value demodulated by the calibration instrument, in units of: "or μm;
αi-the ith standard angle or length value given by the standard system, in units of: "or μm; angle or length reading error:
3. the calibration method for the four-way quadrature differential signal demodulation instrument of claim 2, wherein: and step two, connecting the 10MHz reference output end of the main signal generator to the external input reference end of the slave signal generator, triggering to be set to be ON, setting 10MHz Ref to be automatically closed, and setting the source to be internal.
4. A calibration system for a four-way quadrature differential signal demodulation instrument, which is used to implement a four-way quadrature differential signal demodulation instrument calibration method as claimed in claim 1, 2 or 3, characterized in that: the device comprises a standard signal generating subsystem and two double-channel high-precision signal generators, wherein a calibrated object is a calibrated instrument or a board card; the standard signal generation subsystem is used for generating a standard four-way orthogonal differential signal and comprises a main signal generator and a slave signal generator; the two double-channel high-precision signal generators are used for generating standard four-way differential signals;
synchronously connecting a master signal generator and a slave signal generator in a standard signal generation system; correspondingly connecting output channels of the master signal generator and the slave signal generator to a channel of a calibrated object; respectively setting the waveform, single period, amplitude, bias voltage parameters and initial phase of the channel 1 and the channel 2 of the main signal generator according to the requirement of the output signal of the calibrated object; respectively setting waveforms, single periods, amplitudes, bias voltage parameters and initial phases of the channels 3 and 4 of the slave signal generator according to the third step; determining the number M of trigger cycles according to the angle alpha or the length l which needs to be changed and the steps II, III and V; setting a period T according to the fourth step; and outputting a standard value every time the trigger key is pressed down on the main signal generator, simultaneously recording the solution value of the calibrated object, and calculating the difference between the solution value of the calibrated object and the standard value to obtain the measurement error of the calibrated object.
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