CN111580033B - Method for calibrating phase difference in dynamic calibration process - Google Patents
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Abstract
The invention discloses a method for calibrating phase difference in a dynamic calibration process, and belongs to the field of metering calibration. The implementation method of the invention comprises the following steps: the frequency and voltage generated by the signal generator control the driving standard signal excitation source; connecting the signal generator with the standard measuring system and the calibrated measuring system; setting a signal generator; and acquiring and processing signals of a standard measurement system and a calibrated measurement system, measuring and calculating the amplitude sensitivity and the phase difference, and calibrating the phase-frequency characteristic in the dynamic calibration process. The invention selects the number of channels of the signal generator and the connection mode of the corresponding signal generator, the standard measurement system and the calibrated measurement system according to the dynamic calibration requirement and the calibration working condition, and realizes the corresponding signal generation, excitation, data acquisition and processing modes.
Description
Technical Field
The invention relates to a method for calibrating phase difference in a dynamic calibration process, and belongs to the field of metering calibration.
Background
Compared with static calibration, the dynamic calibration can obtain calibration results closer to actual test conditions, and thus, the dynamic calibration of the sensor is increasingly required. For example, when a sinusoidal signal is used as an excitation source for dynamic calibration, the amplitude-frequency characteristic and the phase-frequency characteristic of the calibrated sensor need to be calibrated. When the calibrated sensor is provided with an independent acquisition and processing system, the effective value or peak value of the standard signal and the output signal of the calibrated sensor can be directly compared during amplitude-frequency characteristic calibration, but for the phase-frequency characteristic, the two acquisition systems are independent from each other, and the phase-frequency characteristic calibration cannot be performed between the two acquisition systems.
Disclosure of Invention
The invention discloses a calibration method of phase difference in a dynamic calibration process, which aims to solve the technical problem of realizing calibration of phase-frequency characteristics in the dynamic calibration process when a calibrated sensor has an independent acquisition and processing system.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a phase difference calibration method in a dynamic calibration process, which adopts a signal generator to realize phase difference calibration in the dynamic calibration process.
The invention discloses a method for calibrating phase difference in a dynamic calibration process, which comprises the following steps:
the method comprises the following steps: the signal generator generates a voltage signal with a certain frequency to drive the standard signal excitation source.
Step two: selecting a corresponding signal generator according to dynamic calibration requirements and calibration working conditions; and realizing corresponding signal generation, excitation, data acquisition and processing modes according to the number of channels of the signal generator and the connection mode of the corresponding signal generator, the standard measurement system and the calibrated measurement system, wherein the three working modes comprise three working modes, and the corresponding signal generation, excitation, data acquisition and processing can be realized in any one of the three working modes according to dynamic calibration requirements and calibration working conditions.
The first method is as follows: when a single-channel signal generator is adopted, the output signal of the single-channel signal generator passes through the multi-pass connector, one path of the output signal is transmitted to the driving standard signal excitation source in the first step, the other path of the output signal is transmitted to the data acquisition and processing system of the standard signal, and the other path of the output signal is transmitted to the data acquisition and processing system of the calibrated sensor.
When a dual channel signal generator is used, there are two modes of operation: the second method comprises the following steps: one channel output signal of the signal generator is sent to a driving standard signal excitation source and simultaneously sent to a data acquisition and processing system of a standard signal, and the other channel output signal is sent to a data acquisition and processing system of a calibrated sensor; the third method comprises the following steps: one channel output signal of the signal generator is sent to a driving standard signal excitation source, and the other channel output signal is sent to a data acquisition and processing system of the standard signal and simultaneously sent to a data acquisition and processing system of a calibrated sensor.
Step three: the output frequency, phase and output voltage of the signal generator are set.
The corresponding method is as follows: when a single-channel signal generator is adopted, the output frequency and the output voltage are set according to the excitation size required to be generated by a standard signal excitation source, wherein the maximum value of the output voltage of the signal generator should not exceed the maximum voltage value allowed to be input by a standard signal data acquisition system and a calibrated sensor data acquisition system.
The corresponding method II comprises the following steps: when the double-channel signal generator is adopted, firstly, the output frequencies of the first channel and the second channel are ensured to be the same, and the phase difference is set to be zero. When the output signal of the channel I is sent to the standard signal excitation source and simultaneously sent to the data acquisition and processing system of the standard signal, the output frequency and the output voltage of the channel I are set according to the excitation size required to be generated by the standard signal excitation source, wherein the maximum value of the output voltage of the signal generator should not exceed the maximum voltage value allowed to be input by the standard signal data acquisition system. And the output voltage of the second channel is set according to the data acquisition and processing system requirement of the calibrated sensor.
The corresponding mode is three: when the double-channel signal generator is adopted, firstly, the output frequencies of the first channel and the second channel are ensured to be the same, and the phase difference is set to be zero. When the output signal of the channel I is only sent to the driving standard signal excitation source, the output frequency and the output voltage amplitude are set according to the excitation size required to be generated by the standard signal excitation source. And the output voltage of the second channel is set according to the data acquisition and processing system of the standard signal and the data acquisition and processing system of the calibrated sensor.
Step four: starting a data acquisition and processing system of the standard signal and a data acquisition and processing system of the calibrated sensor, acquiring the standard signal and an output signal of the signal generator by using the data acquisition and processing system of the standard signal, processing the acquired signal to obtain an amplitude A of the standard signal and a phase angle difference between the standard signal and the signal generator signal
Collecting the output signal of the calibrated sensor and the output signal of the signal generator by using a calibrated sensor data collecting and processing system, and processing the collected signals to obtain the amplitude V output by the calibrated sensor and the phase angle difference between the output signal of the calibrated sensor and the output signal of the signal generator
Step five: and calibrating the amplitude sensitivity and the phase difference according to the test data in the step four, namely calibrating the phase-frequency characteristic in the dynamic calibration process.
Preferably, in step five, the amplitude sensitivity and the phase difference are calibrated, and the calibration is calculated through formulas (1) and (2).
Amplitude sensitivity of calibrated sensor
Phase difference of corrected sensor
Has the advantages that:
1. the invention discloses a method for calibrating phase difference in a dynamic calibration process, wherein a signal generator generates a voltage control driving standard signal excitation source with certain frequency, a single-channel signal generator can be adopted, a double-channel signal generator can be adopted for calibration, the connection between the signal generator and a standard measurement system and a calibrated measurement system is carried out according to the step two, the setting of the signal generator is carried out according to the step three, the signal acquisition and processing of the standard measurement system and the calibrated measurement system are carried out according to the step four, the amplitude sensitivity and the phase difference are calculated according to the step five, and the calibration of the phase-frequency characteristic in the dynamic calibration process is realized. The method solves the problem that the phase-frequency characteristic calibration cannot be carried out when the calibrated sensor has an independent acquisition and processing system.
2. The invention discloses a method for calibrating phase difference in a dynamic calibration process, which selects the number of channels of a signal generator and the connection mode of a corresponding signal generator, a standard measurement system and a calibrated measurement system according to dynamic calibration requirements and calibration working conditions, and realizes corresponding signal generation, excitation, data acquisition and processing modes.
Drawings
Fig. 1 is a block diagram of a system for calibrating phase difference in a dynamic calibration process according to the present disclosure, wherein fig. 1(a) is a block diagram of a calibration system according to a corresponding method; FIG. 1(b) is a block diagram of a calibration system in a corresponding manner; FIG. 1(c) is a block diagram of a corresponding system for three calibration modes;
fig. 2 is a flowchart of a method for calibrating phase difference in a dynamic calibration process 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: gyro dynamic calibration is an example.
As shown in fig. 1(a) and 2, the method for calibrating a phase difference in a dynamic calibration process disclosed in this embodiment includes the following specific steps:
the method comprises the following steps: the frequency and voltage generated by a single-channel signal generator are selected to control the driving standard signal excitation source.
Step two: the output signal is transmitted to the driving standard signal excitation source in the first step, one path is transmitted to the data acquisition and processing system of the standard signal and the other path is transmitted to the data acquisition and processing system of the calibrated sensor through the multi-path connector.
Step three: setting an output frequency f of a signal generator channel 1 Phase alpha 1 And an output voltage v 1 Frequency f 1 Set according to calibration requirements, v 1 Is set according to the output angular velocity of the excitation source, and the phase alpha 1 Is set to 0.v 1 Signal data acquisition system not greater than standardThe maximum voltage value allowed to be input by the system and the calibrated sensor data acquisition system is 10V.
Step four: starting a data acquisition and processing system of the standard signal and a data acquisition and processing system of the calibrated sensor, acquiring the standard signal and an output signal of the signal generator by using the data acquisition and processing system of the standard signal, processing the acquired signal to obtain an amplitude A of the standard signal and a phase angle difference between the standard signal and the signal generator signal
Collecting the output signal of the calibrated sensor and the output signal of the signal generator by using a calibrated sensor data collecting and processing system, and processing the collected signals to obtain the amplitude V output by the calibrated sensor and the phase angle difference between the output signal of the calibrated sensor and the output signal of the signal generator
The measurement results are shown in table 1 below.
TABLE 1 dynamic test results for a type of gyroscope
Step five: and (3) substituting the results obtained by processing the data acquisition and processing system of the standard signal and the data acquisition and processing system of the calibrated sensor into formulas (1) and (2) to calculate the amplitude sensitivity and the phase difference of the gyroscope, and filling the obtained results into a table 1.
Example 2: gyro dynamic calibration is an example.
As shown in fig. 1(b) and 2, the method for calibrating a phase difference in a dynamic calibration process disclosed in this embodiment includes the following specific steps:
the method comprises the following steps: the frequency and voltage generated by a dual-channel signal generator are selected to control the driving standard signal excitation source.
Step two: and the output signal of the first channel is respectively sent to the standard signal data acquisition and processing system and the corrected sensor data acquisition and processing system, and the output signal of the second channel is only sent to the driving standard signal excitation source.
Step three: setting an output frequency f of a signal generator channel 1 Phase alpha 1 And an output voltage v 1 Sum channel two output frequency f 2 Phase alpha 2 And an output voltage v 2 . Wherein f is 2 ＝f 1 ，α 2 ＝α 1 ，v 1 Is set according to the output angular velocity of the excitation source, and notices v 1 And the maximum voltage value of the input voltage is not more than 10V allowed by a standard signal data acquisition system. Output voltage v 2 The method can be independently set, and the set value is as close as possible to the amplitude of the output signal of the calibrated sensor, so that the data acquisition system has the best measurement accuracy. Setting v 2 ＝2V。
Step four: starting a data acquisition and processing system of a standard signal and a data acquisition and processing system of a calibrated sensor, acquiring the standard signal and an output signal of a first signal generator channel by using the data acquisition and processing system of the standard signal, processing the acquired signal to obtain an amplitude A of the standard signal and a phase angle difference between the standard signal and the signal generator signal
The data acquisition and processing system of the calibrated sensor is used for acquiring the output signal of the calibrated sensor and the output signal of the channel II of the signal generator, and the acquired signals are processed to obtain the amplitude V output by the calibrated sensor and the phase angle difference between the output signal of the calibrated sensor and the output signal of the signal generator
The measurement results are shown in table 2 below.
TABLE 2 dynamic test results for a type of gyroscope
Step five: and (3) calculating the amplitude sensitivity and the phase difference of the gyroscope by substituting the results obtained by processing the data acquisition and processing system of the standard signal and the data acquisition and processing system of the calibrated sensor into formulas (1) and (2) and filling the obtained results into a table 2.
Example 3: gyro dynamic calibration is an example.
As shown in fig. 1(c) and 2, the method for calibrating a phase difference in a dynamic calibration process disclosed in this embodiment includes the following specific steps:
the method comprises the following steps: the frequency and voltage generated by a dual-channel signal generator are selected to control the driving standard signal excitation source.
Step two: and the output signal of the first channel is sent to a data acquisition and processing system of the sensor to be calibrated, and the output signal of the second channel is sent to a driving standard signal excitation source and simultaneously sent to a data acquisition and processing system of a standard signal.
Step three: setting an output frequency f of a signal generator channel 1 Phase alpha 1 And an output voltage v 1 Sum channel two output frequency f 2 Phase alpha 2 And an output voltage v 2 . Wherein f is 2 ＝f 1 ，α 2 ＝α 1 ，v 1 Is set according to the output angular speed of the excitation source. Output voltage v 2 The calibration method can be set independently, and the set value selects an optimal value according to the amplitude of the output signal of the calibrated sensor and the amplitude of the output signal of the standard measurement system, so that the two data acquisition systems have optimal measurement accuracy. Setting v 2 ＝2V。
Step four: starting a data acquisition and processing system of the standard signal and a data acquisition and processing system of the calibrated sensor, acquiring the standard signal and an output signal of a second signal generator channel by using the data acquisition and processing system of the standard signal, processing the acquired signal to obtain an amplitude A of the standard signal and a phase angle difference between the standard signal and the signal generator signal
The data acquisition and processing system of the calibrated sensor is used for acquiring the output signal of the calibrated sensor and the second channel output of the signal generatorThe signal processing unit processes the collected signals to obtain the amplitude V output by the calibrated sensor and the phase angle difference between the output signal of the calibrated sensor and the output signal of the signal generator
The measurement results are shown in table 3 below.
TABLE 3 dynamic test results for a type of gyroscope
Step five: and (3) calculating the amplitude sensitivity and the phase difference of the gyroscope by substituting formulas (1) and (2) according to the results obtained by processing the data acquisition and processing system of the standard signal and the data acquisition and processing system of the calibrated sensor respectively, and filling the obtained results into a table 3.
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 (3)
1. A method for calibrating phase difference in a dynamic calibration process is characterized in that: comprises the following steps of (a) carrying out,
the method comprises the following steps: the signal generator generates a voltage signal with a certain frequency to control the standard signal excitation source;
step two: selecting a corresponding signal generator according to the dynamic calibration requirement and the calibration working condition; according to the number of channels of the signal generator and the connection mode of the corresponding signal generator, the standard measuring system and the calibrated measuring system, the corresponding signal generation, excitation, data acquisition and processing modes are realized, and the method comprises three working modes: the first method is as follows: when a single-channel signal generator is adopted, the output signal of the single-channel signal generator passes through a multi-way connector, one path of the output signal is transmitted to a driving standard signal excitation source in the first step, the other path of the output signal is transmitted to a data acquisition and processing system of a standard signal, and the other path of the output signal is transmitted to a data acquisition and processing system of a calibrated sensor;
when a dual channel signal generator is used, there are two modes of operation: the second method comprises the following steps: respectively sending one channel output signal of the signal generator to a standard signal data acquisition and processing system and a corrected sensor data acquisition and processing system, and sending the other channel output signal to a driving standard signal excitation source; the third method comprises the following steps: one channel output signal of a signal generator is sent to a data acquisition and processing system of a sensor to be calibrated, and the other channel output signal is sent to a driving standard signal excitation source and simultaneously sent to a data acquisition and processing system of a standard signal; selecting one of the three working modes according to dynamic calibration requirements and calibration conditions to realize corresponding signal generation, excitation, data acquisition and processing;
step three: setting the output frequency, the phase and the output voltage of the signal generator;
step four: starting a data acquisition and processing system of the standard signal and a data acquisition and processing system of the calibrated sensor, acquiring the standard signal and an output signal of the signal generator by using the data acquisition and processing system of the standard signal, processing the acquired signal to obtain an amplitude A of the standard signal and a phase angle difference between the standard signal and the signal generator signal
The data acquisition and processing system of the calibrated sensor is used for acquiring the output signal of the calibrated sensor and the output signal of the signal generator and processing the acquired signals to obtain the amplitude V output by the calibrated sensor and the phase angle difference between the output signal of the calibrated sensor and the output signal of the signal generator
Step five: and calibrating the amplitude sensitivity and the phase difference according to the test data in the step four, namely calibrating the phase-frequency characteristic in the dynamic calibration process.
2. A method for calibrating phase differences during dynamic calibration as claimed in claim 1, wherein: the third step is to realize the method as follows,
the corresponding method is as follows: when a single-channel signal generator is adopted, the output frequency and the output voltage are set according to the excitation size required to be generated by a standard signal excitation source, wherein the maximum value of the output voltage of the signal generator should not exceed the maximum voltage value allowed to be input by a standard signal data acquisition system and a calibrated sensor data acquisition system;
the corresponding method II comprises the following steps: when a double-channel signal generator is adopted, firstly, the output frequencies of a channel I and a channel II are ensured to be the same, and the phase difference is set to be zero; when the output signal of the channel I is only sent to the driving standard signal excitation source, the output frequency and the output voltage amplitude are set according to the excitation size required to be generated by the standard signal excitation source; the output voltage of the second channel is set according to the data acquisition and processing system of the standard signal and the data acquisition and processing system requirement of the calibrated sensor;
the corresponding mode is three: when a double-channel signal generator is adopted, firstly, the output frequencies of a channel I and a channel II are ensured to be the same, and the phase difference is set to be zero; when the output signal of the channel I is sent to the standard signal excitation source and simultaneously sent to the data acquisition and processing system of the standard signal, the output frequency and the output voltage of the channel I are set according to the excitation size required to be generated by the standard signal excitation source, wherein the maximum value of the output voltage of the signal generator should not exceed the maximum voltage value allowed to be input by the standard signal data acquisition system.
3. A method of calibrating phase differences during dynamic calibration as claimed in claim 1 or 2, characterized by: calibrating the amplitude sensitivity and the phase difference, and calculating and calibrating through formulas (1) and (2);
amplitude sensitivity of calibrated sensor
Phase difference of corrected sensor
。
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