CN112748384A - Device and method for calibrating induction type polarity detection system - Google Patents
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Abstract
The invention relates to a calibration device and a calibration method for an induction type polarity detection system, which realize the calibration of the induction type polarity detection system, wherein the calibration device comprises an upper computer, a control system, an alternating current source, a current measurement system and an alternating magnetic field coil which are sequentially connected; after the equipment is powered on, setting output current waveform parameters by an upper computer and a control system, and outputting a precise target alternating current source signal by an alternating current source according to the current waveform parameters; converting a precise target alternating current source signal into a voltage signal through a standard resistor, collecting the voltage signal to obtain a voltage curve, converting the voltage curve into a current curve, and analyzing and processing data to obtain a standard current parameter; the voltage signal is converted into a magnetic field signal through an alternating magnetic field coil, an induction type polarity detection system measures the magnetic field signal to obtain a measured current parameter, and the measured current parameter is compared with a standard current parameter to realize calibration.
Description
Technical Field
The invention relates to a calibration device and a calibration method of an induction type polarity detection system.
Background
The aerospace engine is a core component for ensuring accurate orbit entering and long-term on-orbit running of the spacecraft, the power system of the aerospace engine is required to act accurately and respond quickly, an electromagnetic valve of the engine is opened and closed according to the requirement of a control instruction to generate impulse-form thrust to realize pulse width modulation of the thrust, and the working process of the aerospace engine is an action sequence with strict time requirement. In order to meet the requirements of consistency, coordination and matching of model power systems and control systems, researchers develop induction type polarity detection systems (see rocket propulsion-6 months 2011, research on non-contact measurement methods of opening and closing characteristics of electromagnetic valves), and the systems can detect and display the conditions of actions of various model power systems according to control instructions in real time.
At present, an induction type polarity detection system can only carry out function verification, and an effective calibration system and an effective calibration method are not available for calibrating the induction type polarity detection system, so that the detection precision of the induction type polarity detection system cannot meet the requirement.
Disclosure of Invention
In order to solve the calibration problem of the inductive polarity detection system, the invention provides a calibration device and method of the inductive polarity detection system.
The technical scheme of the invention is to provide an induction type polarity detection system calibration device, which is characterized in that: the device comprises an upper computer, a control system, an alternating current source, a current measuring system and an alternating magnetic field coil which are connected in sequence;
the alternating current source is used for outputting a precise target alternating current source signal according to instructions of the upper computer and the control system;
the current measuring system comprises a standard resistor and a digital multimeter, wherein the standard resistor is used for converting a precise target alternating current source signal output by the alternating current source into a voltage signal; the digital multimeter is used for collecting voltage data on the standard resistor;
the alternating magnetic field coil is used for converting the voltage signal into a magnetic field signal; the corrected object induction type polarity detection system measures a magnetic field signal and outputs a measurement current;
the upper computer and the control system are internally provided with a computer program, and when the computer program is executed by the processor, the following steps are realized:
step 1, controlling an alternating current source to output a precise target alternating current source signal;
and 2, converting voltage data on the standard resistor acquired by the digital multimeter into standard current parameters, and comparing the standard current parameters with current parameters measured by the corrected object induction type polarity detection system to realize calibration.
Further, the alternating current source comprises an ACDC module, an FPGA + DSP main controller, a high-precision clock module, a touch screen, a high-precision DAC, a controllable power supply, a power dissipation MOS array, a precise linear current control circuit and a linear feedback and compensation circuit;
the ACDC module is used for converting 220V alternating current output by a mains supply into direct current and outputting the direct current to the FPGA + DSP main controller for power supply;
the high-precision clock module is used for clock synchronization and ensures the clock frequency synchronization of signals of the FPGA and the DSP main controller;
inputting current waveform parameters to the FPGA + DSP main controller by using a touch screen according to instructions sent by an upper computer and a control system, wherein the current waveform parameters comprise rising time, falling time, inflection point time, amplitude of a rising stage, amplitude of a falling stage and amplitude of an inflection point;
the FPGA + DSP main controller converts the current waveform parameters into amplitude parameters and time parameters, transmits the amplitude parameters to the controllable power supply and transmits the time parameters to the high-precision DAC;
the controllable power supply is used for outputting voltage to the power dissipation MOS array according to the amplitude parameter sent by the FPGA + DSP main controller;
the power dissipation MOS array is used for improving the output power of the controllable power supply;
the high-precision DAC is used for outputting an alternating current control signal according to the time parameter sent by the FPGA + DSP main controller and used as the input of the precise linear current control circuit;
the precise linear current control circuit is used for receiving the alternating current control signal, controlling the power dissipation MOS array to work in a linear working area and finally outputting a target alternating current source signal;
the linear feedback and compensation circuit is used for compensating the signal output of the precise linear current control circuit so as to control the precise linear current control circuit to output a precise target alternating current source signal.
Furthermore, the alternating magnetic field coil adopts a four-ring Barker coil.
The calibration method of the induction type polarity detection system is characterized by comprising the following steps:
step 1, setting output current waveform parameters including rising time, falling time, inflection point time, rising stage amplitude, falling stage amplitude and inflection point amplitude parameters by an upper computer and a control system;
step 2, the alternating current source outputs a precise target alternating current source signal according to the current waveform parameter;
step 3, converting the precise target alternating current source signal into a voltage signal through a standard resistor, collecting the voltage signal to obtain a voltage curve, converting the voltage curve into a current curve, and obtaining a standard current parameter through analysis and data processing;
and 4, converting the voltage signal into a magnetic field signal through an alternating magnetic field coil, measuring by an induction type polarity detection system to obtain a measured current parameter, and comparing the measured current parameter with a standard current parameter to realize calibration.
Further, step 2 specifically comprises:
the ACDC module converts 220V alternating current output by a mains supply into direct current and outputs the direct current to the FPGA + DSP main controller for supplying power;
the high-precision clock module sends a clock synchronization instruction to ensure the signal clock frequency synchronization of the FPGA and the DSP main controller;
inputting current waveform parameters to the FPGA + DSP main controller by using a touch screen according to instructions sent by an upper computer and a control system, wherein the current waveform parameters comprise rising time, falling time, inflection point time, amplitude of a rising stage, amplitude of a falling stage and amplitude of an inflection point;
the FPGA + DSP main controller converts the current waveform parameters into amplitude parameters and time parameters, transmits the amplitude parameters to the controllable power supply and transmits the time parameters to the high-precision DAC;
the controllable power supply outputs voltage to the power dissipation MOS array according to the amplitude parameter sent by the FPGA + DSP main controller;
the power dissipation MOS array promotes the output power of the controllable power supply;
the high-precision DAC outputs an alternating current control signal according to the time parameter sent by the FPGA + DSP main controller and serves as the input of the precision linear current control circuit;
the precise linear current control circuit receives the alternating current control signal and controls the power dissipation MOS array to work in a linear working area, and finally a target precise alternating current source signal is output;
the linear feedback and compensation circuit compensates the signal output of the precise linear current control circuit, and then controls the precise linear current control circuit to output a target precise alternating current source signal.
The invention has the advantages that:
1. the invention sets target alternating current parameters through an upper computer and a control system, controls an alternating current source to output precise target alternating current source signals according to the alternating current parameters, converts the target alternating current source signals into voltage signals, converts the voltage signals into magnetic field signals through an alternating magnetic field coil, obtains measured current parameters through measurement by an induction type polarity detection system, and compares the measured current parameters with standard current parameters to realize calibration. By setting different alternating current parameters, the calibration of various induction type polarity detection systems can be realized.
2. The scheme has simple, feasible and effective structure and popularization value.
Drawings
FIG. 1 is a schematic block diagram of an inductive polarity detection system calibration apparatus;
fig. 2 is a schematic block diagram of an alternating current source in an embodiment.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As can be seen from fig. 1, the calibration device for the induction polarity detection system of the present embodiment includes an upper computer, a control system, an alternating current source, a current measurement system, and an alternating magnetic field coil. The output end of the upper computer and the control system is connected with the input end of the alternating current source, and the alternating current source can be controlled to output a required precise alternating current source signal. The alternating current source schematic block diagram is shown in fig. 2 and comprises an ACDC module, an FPGA + DSP main controller, a high-precision clock module, a touch screen, a high-precision DAC, a controllable power supply, a power dissipation MOS array, a precision linear current control circuit and a linear feedback and compensation circuit; the input end of the ACDC module is used for being connected with a mains supply, the output end of the ACDC module is connected with the input end of the FPGA + DSP main controller, and 220V alternating current output by the mains supply can be converted into direct current to be output to the FPGA + DSP main controller for supplying power. The output end of the high-precision clock module is connected with the input end of the FPGA + DSP main controller and used for clock synchronization, and signal clock frequency synchronization of the FPGA + DSP main controller is guaranteed. The touch screen is connected with the FPGA + DSP main controller, and current waveform parameters can be input into the FPGA + DSP main controller according to instructions sent by the upper computer and the control system through the touch screen, wherein the current waveform parameters comprise rising time, falling time, inflection point time, amplitude of a rising stage, amplitude of a falling stage and amplitude of an inflection point. The FPGA + DSP main controller is used for converting the current waveform parameters into amplitude parameters and time parameters, transmitting the amplitude parameters to the controllable power supply and transmitting the time parameters to the high-precision DAC. The controllable power supply and the high-precision DAC are both connected with the FPGA + DSP main controller, and the controllable power supply is used for outputting voltage to the power dissipation MOS array according to amplitude parameters sent by the FPGA + DSP main controller; and the high-precision DAC is used for outputting an alternating current control signal according to the time parameter sent by the FPGA + DSP main controller and used as the input of the precise linear current control circuit. The input end of the power dissipation MOS array is connected with the output end of the controllable power supply and used for improving the output power of the controllable power supply. The input end of the precise linear current control circuit is connected with the power dissipation MOS array and the output end of the high-precision DAC, and the precise linear current control circuit is used for receiving the alternating current control signal, controlling the power dissipation MOS array to work in a linear working area and finally outputting a target alternating current source signal. The linear feedback and compensation circuit is connected with the precise linear current control circuit and the high-precision DAC and used for compensating the signal output of the precise linear current control circuit so as to control the precise linear current control circuit to output a precise target alternating current power supply signal.
The current measuring system comprises a standard resistor and a digital multimeter, wherein the standard resistor is used for converting alternating current output by the alternating current source into a voltage signal; the digital multimeter is used for collecting voltage data on the standard resistor; the alternating magnetic field coil can adopt a four-ring Barker coil and is used for converting a voltage signal into a magnetic field signal. The corrected object induction type polarity detection system measures a magnetic field signal and outputs a measurement current; and converting alternating voltage data on the standard resistor acquired by the digital multimeter into standard current parameters, and comparing the standard current parameters with current parameters measured by the corrected object induction type polarity detection system to realize calibration.
The specific calibration process can be realized by the following method:
step 1, setting output current waveform parameters including rising time, falling time, inflection point time, rising stage amplitude, falling stage amplitude and inflection point amplitude parameters by an upper computer and a control system;
step 2, the alternating current source outputs a target precise alternating current source signal according to the current waveform parameter;
the ACDC module converts 220V alternating current output by a mains supply into direct current and outputs the direct current to the FPGA + DSP main controller for supplying power; the high-precision clock module sends a clock synchronization instruction to ensure the signal clock frequency synchronization of the FPGA and the DSP main controller; inputting current waveform parameters to the FPGA + DSP main controller by using a touch screen according to instructions sent by an upper computer and a control system, wherein the current waveform parameters comprise rising time, falling time, inflection point time, amplitude of a rising stage, amplitude of a falling stage and amplitude of an inflection point; the FPGA + DSP main controller converts the current waveform parameters into amplitude parameters and time parameters, transmits the amplitude parameters to the controllable power supply and transmits the time parameters to the high-precision DAC; the controllable power supply outputs voltage to the power dissipation MOS array according to the amplitude parameter sent by the FPGA + DSP main controller; the power dissipation MOS array promotes the output power of the controllable power supply; the high-precision DAC outputs an alternating current control signal according to the time parameter sent by the FPGA + DSP main controller and serves as the input of the precision linear current control circuit; the precise linear current control circuit receives the alternating current control signal and controls the power dissipation MOS array to work in a linear working area, and finally a target alternating current source signal is output; the linear feedback and compensation circuit compensates the signal output of the precise linear current control circuit, and then controls the precise linear current control circuit to output a precise target alternating current source signal.
Step 3, converting the precise alternating current source signal into a voltage signal through a standard resistor, collecting the voltage signal to obtain a voltage curve, converting the voltage curve into a current curve, and obtaining a standard current parameter through analysis and data processing;
and 4, converting the voltage signal into a magnetic field signal through an alternating magnetic field coil, measuring by an induction type polarity detection system to obtain a measured current parameter, and comparing the measured current parameter with a standard current parameter to realize calibration.
Claims (5)
1. The utility model provides an induction type polarity detecting system calibrating device which characterized in that: the device comprises an upper computer, a control system, an alternating current source, a current measuring system and an alternating magnetic field coil which are connected in sequence;
the alternating current source is used for outputting a precise target alternating current source signal according to instructions of the upper computer and the control system;
the current measuring system comprises a standard resistor and a digital multimeter, wherein the standard resistor is used for converting a precise target alternating current source signal output by the alternating current source into a voltage signal; the digital multimeter is used for collecting voltage data on the standard resistor;
the alternating magnetic field coil is used for converting the voltage signal into a magnetic field signal; the corrected object induction type polarity detection system measures a magnetic field signal and outputs a measurement current;
the upper computer and the control system are internally provided with a computer program, and when the computer program is executed by the processor, the following steps are realized:
step 1, controlling an alternating current source to output a precise target alternating current source signal;
and 2, converting voltage data on the standard resistor acquired by the digital multimeter into standard current parameters, and comparing the standard current parameters with current parameters measured by the corrected object induction type polarity detection system to realize calibration.
2. The inductive polarity detection system calibration device of claim 1, wherein: the alternating current source comprises an ACDC module, an FPGA + DSP main controller, a high-precision clock module, a touch screen, a high-precision DAC, a controllable power supply, a power dissipation MOS array, a precise linear current control circuit and a linear feedback and compensation circuit;
the ACDC module is used for converting 220V alternating current output by a mains supply into direct current and outputting the direct current to the FPGA + DSP main controller for power supply;
the high-precision clock module is used for clock synchronization and ensures the clock frequency synchronization of signals of the FPGA and the DSP main controller;
inputting current waveform parameters to the FPGA + DSP main controller by using a touch screen according to instructions sent by an upper computer and a control system, wherein the current waveform parameters comprise rising time, falling time, inflection point time, amplitude of a rising stage, amplitude of a falling stage and amplitude of an inflection point;
the FPGA + DSP main controller converts the current waveform parameters into amplitude parameters and time parameters, transmits the amplitude parameters to the controllable power supply and transmits the time parameters to the high-precision DAC;
the controllable power supply is used for outputting voltage to the power dissipation MOS array according to the amplitude parameter sent by the FPGA + DSP main controller;
the power dissipation MOS array is used for improving the output power of the controllable power supply;
the high-precision DAC is used for outputting an alternating current control signal according to the time parameter sent by the FPGA + DSP main controller and used as the input of the precise linear current control circuit;
the precise linear current control circuit is used for receiving the alternating current control signal, controlling the power dissipation MOS array to work in a linear working area and finally outputting a target alternating current source signal;
the linear feedback and compensation circuit is used for compensating the signal output of the precise linear current control circuit so as to control the precise linear current control circuit to output a precise target alternating current source signal.
3. The inductive polarity detection system calibration device of claim 1 or 2, wherein: the alternating magnetic field coil adopts a four-ring Barker coil.
4. An induction type polarity detection system calibration method is characterized by comprising the following steps:
step 1, setting output current waveform parameters including rising time, falling time, inflection point time, rising stage amplitude, falling stage amplitude and inflection point amplitude parameters by an upper computer and a control system;
step 2, the alternating current source outputs a precise target alternating current source signal according to the current waveform parameter;
step 3, converting the precise target alternating current source signal into a voltage signal through a standard resistor, collecting the voltage signal to obtain a voltage curve, converting the voltage curve into a current curve, and obtaining a standard current parameter through analysis and data processing;
and 4, converting the voltage signal into a magnetic field signal through an alternating magnetic field coil, measuring by an induction type polarity detection system to obtain a measured current parameter, and comparing the measured current parameter with a standard current parameter to realize calibration.
5. The method for calibrating an inductive polarity detection system according to claim 4, wherein step 2 specifically comprises:
the ACDC module converts 220V alternating current output by a mains supply into direct current and outputs the direct current to the FPGA + DSP main controller for supplying power;
the high-precision clock module sends a clock synchronization instruction to ensure the signal clock frequency synchronization of the FPGA and the DSP main controller;
inputting current waveform parameters to the FPGA + DSP main controller by using a touch screen according to instructions sent by an upper computer and a control system, wherein the current waveform parameters comprise rising time, falling time, inflection point time, amplitude of a rising stage, amplitude of a falling stage and amplitude of an inflection point;
the FPGA + DSP main controller converts the current waveform parameters into amplitude parameters and time parameters, transmits the amplitude parameters to the controllable power supply and transmits the time parameters to the high-precision DAC;
the controllable power supply outputs voltage to the power dissipation MOS array according to the amplitude parameter sent by the FPGA + DSP main controller;
the power dissipation MOS array promotes the output power of the controllable power supply;
the high-precision DAC outputs an alternating current control signal according to the time parameter sent by the FPGA + DSP main controller and serves as the input of the precision linear current control circuit;
the precise linear current control circuit receives the alternating current control signal and controls the power dissipation MOS array to work in a linear working area, and finally a target alternating current source signal is output;
the linear feedback and compensation circuit compensates the signal output of the precise linear current control circuit, and then controls the precise linear current control circuit to output a precise target alternating current source signal.
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