CN111781548B - Vibration device and method for vibrating sample magnetometer - Google Patents
Vibration device and method for vibrating sample magnetometer Download PDFInfo
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- CN111781548B CN111781548B CN202010839934.XA CN202010839934A CN111781548B CN 111781548 B CN111781548 B CN 111781548B CN 202010839934 A CN202010839934 A CN 202010839934A CN 111781548 B CN111781548 B CN 111781548B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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Abstract
The invention relates to a vibrating device and a vibrating method of a vibrating sample magnetometer, wherein a linear voice coil motor is matched with a grating ruler in the vibrating device, a signal output end of the grating ruler is connected with a microcontroller, an input end of a displacement signal source is electrically connected with the microcontroller, an input end of an alternating current signal source is electrically connected with the microcontroller, an output end of the alternating current signal source and an output end of the displacement signal source are electrically connected with an input end of a differential amplifier, an input end of the direct current signal source is electrically connected with the microcontroller, and an output end of the direct current signal source and an output end of the differential amplifier are electrically connected with an input end of an adder, wherein an output end of the adder is electrically connected with the linear voice coil motor through a current source. The invention uses the linear voice coil motor as a vibration source, uses closed-loop control combining digital and analog, ensures stable vibration frequency and amplitude, has small mass and large load capacity, has simple and reliable control circuit, has technical indexes reaching the level of foreign commercial instruments, and can replace import.
Description
Technical Field
The invention relates to a vibrating sample magnetometer, in particular to a vibrating device and a vibrating method of the vibrating sample magnetometer.
Background
The vibrating sample magnetometer is a high-sensitivity magnetic moment measuring instrument based on electromagnetic induction principle, and the induction voltage generated by the vibration of the measured sample in the detection coil is in direct proportion to the magnetic moment, amplitude and vibration frequency of the sample. The phase-locked amplifier is used for measuring the voltage on the basis of guaranteeing the unchanged amplitude and vibration frequency, and then the magnetic moment of the sample to be measured can be calculated. The vibration head is a key component in the vibrating sample magnetometer, and the stability of the amplitude and the vibration frequency is critical to the measurement result. At present, a plurality of commercial vibrating sample magnetometers exist at home and abroad, for example, a vibrating sample magnetometer of a company at home and abroad uses a linear motor as a vibrating source, and a digital closed loop mode is adopted, so that the vibrating frequency and amplitude of a sample are stable, good accuracy is obtained, but the vibrating sample magnetometer is expensive, is limited by import and has heavy vibrating source quality. In the vibration sample magnetometer of another company in abroad, for example, a loudspeaker is used as a vibration source, and a simulation closed-loop mode is adopted, so that the vibration frequency and amplitude of the sample are stable, and good accuracy is obtained, but the vibration sample magnetometer is high in price and limited by importation, and the vibration source is not used for a long time, and needs to be operated for a long time in an open loop to be closed-loop.
Disclosure of Invention
The invention aims to solve the technical problems of providing a vibrating device and a vibrating method for a vibrating sample magnetometer, which take a linear voice coil motor as a vibrating source, use closed-loop control combining digital and analog to ensure that the vibrating frequency and amplitude are stable, and have the advantages of small mass, large load capacity, simple and reliable control circuit and capability of replacing import when the technical index reaches the level of a foreign commercial instrument.
The technical scheme includes that the vibrating device of the vibrating sample magnetometer comprises a linear voice coil motor, a grating ruler, a microcontroller, a displacement signal source, an alternating current signal source, a difference amplifier, a direct current signal source, an adder and a current source, wherein the linear voice coil motor is matched with the grating ruler, the grating ruler is used for detecting displacement of an output shaft of the linear voice coil motor, a signal output end of the grating ruler is electrically connected with an input end of the microcontroller, an input end of the displacement signal source is electrically connected with the microcontroller, an input end of the alternating current signal source is electrically connected with the microcontroller, an output end of the alternating current signal source and an output end of the displacement signal source are electrically connected with an input end of the difference amplifier, an input end of the direct current signal source is electrically connected with the microcontroller, an output end of the direct current signal source and an output end of the difference amplifier are electrically connected with an input end of the adder, and an output end of the adder is electrically connected with the linear voice coil motor through the current source.
The vibration device has the advantages that the cylindrical linear voice coil motor is used as a vibration source, the linear voice coil motor works in an alternating current-direct current superposition state, the grating ruler is used for displacement measurement, digital displacement signals collected by the grating ruler are supplied to the displacement signal source to be converted into analog displacement signals for analog feedback, digital and analog combined closed-loop control is adopted, the analog displacement signals are analog signals converted in real time by the digital displacement signals, the analog closed-loop circuit only carries out alternating current signal feedback, and the direct current signals are independent and are used for counteracting the weight of the linear voice coil motor rotor, so that the vibration frequency and amplitude are stable, meanwhile, the vibration device has small mass and large load capacity, a control circuit is simple and reliable, the technical index reaches the level of a foreign commercial instrument, and the vibration device can replace an import.
On the basis of the technical scheme, the invention can be improved as follows.
The linear motor is characterized by further comprising a sliding table, wherein an output shaft of the linear motor is connected with the sliding table and can vibrate up and down along the sliding table; the grating ruler is installed on the sliding table.
Further, the difference amplifier is specifically a first-order integrator.
Based on the vibrating device for vibrating the sample magnetometer, the invention also provides a vibrating method for vibrating the sample magnetometer.
A vibration method of a vibrating sample magnetometer uses a linear voice coil motor as a vibration source of the vibrating sample magnetometer, the vibration method comprising the steps of,
Providing a corresponding direct current signal for the linear voice coil motor according to the gravity borne by the linear voice coil motor rotor, and enabling the linear voice coil motor rotor to be in a central balance position through the direct current signal;
simultaneously acquiring a digital displacement signal of the rotor vibration of the linear voice coil motor and converting the digital displacement signal into an analog displacement signal in real time;
The alternating current signal and the analog displacement signal are subjected to differential amplification processing to output a differential alternating current signal;
And superposing the difference alternating current signal and the direct current signal and driving the linear voice coil motor rotor to vibrate up and down at the central position.
The vibration method has the advantages that the linear voice coil motor is used as a vibration source of the vibrating sample magnetometer, the direct current signal acts on the linear voice coil motor and is used for counteracting the gravity borne by the mover of the linear voice coil motor, so that the mover of the linear voice coil motor is positioned at the central balance position, the analog displacement signal is an analog signal converted in real time by the digital displacement signal, the analog closed loop is only used for feeding back the alternating current signal, and the digital and analog combined closed loop control is adopted, so that the vibration frequency and amplitude are stable, meanwhile, the vibration method has the advantages of small mass, large load capacity, simple and reliable control circuit, and technical indexes reaching the level of foreign commercial instruments and being capable of replacing imports.
On the basis of the technical scheme, the invention can be improved as follows.
The method comprises the steps of converting the direct current signal from the direct current voltage signal into a direct current signal, inputting the direct current signal into the linear voice coil motor, and driving the linear voice coil motor rotor to be in a central balance position.
Further, the alternating current signal is specifically an alternating current voltage signal, the difference alternating current signal and the direct current signal are overlapped to drive the linear voice coil motor rotor to vibrate up and down at the center position, specifically comprising,
And superposing the difference alternating current signal and the direct current signal to obtain an alternating current-direct current mixed voltage signal, converting the alternating current-direct current mixed voltage signal into an alternating current-direct current mixed current signal, inputting the alternating current-direct current mixed current signal to the linear voice coil motor, and driving the linear voice coil motor rotor to vibrate up and down at the central position.
Drawings
FIG. 1 is a schematic diagram of a vibrating device for vibrating a sample magnetometer according to the invention;
FIG. 2 is a flow chart of a method of vibrating a sample magnetometer of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. The linear voice coil motor, 2, grating ruler, 3, slip table.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, the vibration device of the vibration sample magnetometer comprises a linear voice coil motor 1, a grating ruler 2, a microcontroller, a displacement signal source, an alternating current signal source, a difference amplifier, a direct current signal source, an adder and a current source, wherein the linear voice coil motor 1 is matched with the grating ruler 2, the grating ruler 2 is used for detecting the displacement of an output shaft of the linear voice coil motor 1, a signal output end of the grating ruler 2 is electrically connected with an input end of the microcontroller, an input end of the displacement signal source is electrically connected with the microcontroller, an input end of the alternating current signal source is electrically connected with the microcontroller, an output end of the alternating current signal source and an output end of the displacement signal source are electrically connected with the input end of the difference amplifier, an output end of the direct current signal source and an output end of the difference amplifier are electrically connected with the input end of the adder, and an output end of the adder is electrically connected with the linear voice coil motor 1 through the current source.
In this particular embodiment:
Preferably, the vibration device further comprises a sliding table 3, an output shaft of the linear motor 1 is connected with the sliding table 3 and can vibrate up and down along the sliding table 3, and the grating ruler 2 is mounted on the sliding table 3.
Preferably, the difference amplifier is specifically a first-order integrator.
The working principle of the vibration device is that a microcontroller (32-bit ARM chip) is used as a control center, firstly, the microcontroller controls a direct current signal source to send out a direct current signal, so that a rotor (a voice coil winding and a winding bracket) of a linear voice coil motor is positioned at a central balance position (the rotor is positioned at the bottom due to gravity of the rotor of the linear voice coil motor), the microcontroller sets an alternating current signal source according to given frequency and amplitude signals and controls the alternating current signal source to provide corresponding alternating current signals, and the microcontroller receives digital displacement signals of a grating ruler and converts the digital displacement signals into analog displacement signals in real time by using the displacement signal source. The alternating current signal provided by the alternating current signal source and the analog displacement signal are amplified by a difference amplifier (a first-order integrator) to output a difference alternating current signal, and the difference alternating current signal is superposed with a direct current signal provided by the direct current signal source and then converted into current by a current source, so that a linear voice coil motor rotor is driven to vibrate up and down along a sliding table at the central position.
When the whole vibration system works stably, the frequency and the amplitude of the alternating current signal provided by the alternating current signal source are equal to those of the analog displacement signal, so that the amplitude and the frequency stability of the vibration of the linear voice coil motor rotor can be ensured as long as the amplitude and the frequency stability of the alternating current signal provided by the alternating current signal source are stable.
To ensure stable operation of the entire vibration system, it is most important to simulate the design of a closed loop. Vibrating the sample magnetometer requires simple harmonic motion of the vibrating head. The force to which a simple harmonic moving object is subjected is proportional to the displacement and is always directed to the equilibrium position. And the force applied to the rotor in the linear voice coil motor is the resultant force of gravity and ampere force applied to the current. In the invention, the direct current signal source is supplied to the voice coil winding through the current source to exactly compensate the gravity of the rotor, so that the magnitude of the alternating current supplied to the voice coil winding by the alternating current signal source is in direct proportion to the vibration displacement of the rotor, and the phases are opposite. The differential amplifier can well complete the function of the differential amplifier by using the first-order integrator, and the amplitude of the alternating current signal source is equal to that of the analog displacement signal, and the phases of the alternating current signal source and the analog displacement signal are opposite, so that the differential amplifier (the first-order integrator) can stably output signals in phase with the alternating current signal source.
The vibration device has adjustable amplitude (0.5-2 mm), adjustable vibration frequency (10-80 Hz) and stable vibration frequency and amplitude of the sample.
In summary, in the vibration device of the invention, the cylindrical linear voice coil motor is used as the vibration source, the linear voice coil motor works in an alternating current-direct current superposition state, the displacement measurement adopts the grating ruler, the digital displacement signal collected by the grating ruler is converted into the analog displacement signal by the displacement signal source for analog feedback, the digital-analog combined closed-loop control is adopted, the analog displacement signal is an analog signal converted in real time by the digital displacement signal, the analog closed-loop circuit only carries out alternating current signal feedback, and the direct current signal is independent and is used for counteracting the weight of the linear voice coil motor rotor, so that the vibration frequency and the amplitude are stable, meanwhile, the vibration device has small mass and large load capacity, the control circuit is simple and reliable, the technical index reaches the level of a foreign commercial instrument, and the vibration device can replace an import.
Based on the vibrating device for vibrating the sample magnetometer, the invention also provides a vibrating method for vibrating the sample magnetometer.
As shown in fig. 2, a vibration method of a vibrating sample magnetometer using a linear voice coil motor as a vibration source of the vibrating sample magnetometer, the vibration method comprising the steps of,
Providing a corresponding direct current signal for the linear voice coil motor according to the gravity borne by the linear voice coil motor rotor, and enabling the linear voice coil motor rotor to be in a central balance position through the direct current signal;
simultaneously acquiring a digital displacement signal of the rotor vibration of the linear voice coil motor and converting the digital displacement signal into an analog displacement signal in real time;
The alternating current signal and the analog displacement signal are subjected to differential amplification processing to output a differential alternating current signal;
And superposing the difference alternating current signal and the direct current signal and driving the linear voice coil motor rotor to vibrate up and down at the central position.
The vibration method has the advantages that the linear voice coil motor is used as a vibration source of the vibrating sample magnetometer, the direct current signal acts on the linear voice coil motor and is used for counteracting the gravity borne by the mover of the linear voice coil motor, so that the mover of the linear voice coil motor is positioned at the central balance position, the analog displacement signal is an analog signal converted in real time by the digital displacement signal, the analog closed loop is only used for feeding back the alternating current signal, and the digital and analog combined closed loop control is adopted, so that the vibration frequency and amplitude are stable, meanwhile, the vibration method has the advantages of small mass, large load capacity, simple and reliable control circuit, and technical indexes reaching the level of foreign commercial instruments and being capable of replacing imports.
In this particular embodiment:
The method comprises the steps of converting the direct current signal from the direct current voltage signal into a direct current signal, inputting the direct current signal into the linear voice coil motor, and driving the linear voice coil motor rotor to be in a central balance position.
Preferably, the alternating current signal is an alternating current voltage signal, the difference alternating current signal and the direct current signal are overlapped to drive the linear voice coil motor rotor to vibrate up and down at the central position, and the method comprises the following steps of,
And superposing the difference alternating current signal and the direct current signal to obtain an alternating current-direct current mixed voltage signal, converting the alternating current-direct current mixed voltage signal into an alternating current-direct current mixed current signal, inputting the alternating current-direct current mixed current signal to the linear voice coil motor, and driving the linear voice coil motor rotor to vibrate up and down at the central position.
The vibration method of the invention uses the linear voice coil motor as a vibration source of the vibration sample magnetometer, applies a direct current signal to the linear voice coil motor for counteracting the gravity born by the mover of the linear voice coil motor, so that the mover of the linear voice coil motor is positioned at a central balance position, and the analog displacement signal is an analog signal converted in real time by a digital displacement signal, and the analog closed loop is only used for feedback of an alternating current signal, and adopts closed loop control combining digital and analog to ensure stable vibration frequency and amplitude, and simultaneously has the advantages of small mass, large load capacity, simple and reliable control circuit, and technical index reaching the level of foreign commercial instruments and being capable of replacing an inlet.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A vibrating device of a vibrating sample magnetometer is characterized by comprising a linear voice coil motor, a grating ruler, a microcontroller, a displacement signal source, an alternating current signal source, a difference amplifier, a direct current signal source, an adder and a current source, wherein the linear voice coil motor is matched with the grating ruler, the grating ruler is used for detecting the displacement of an output shaft of the linear voice coil motor in an up-down vibrating mode, a signal output end of the grating ruler is electrically connected with an input end of the microcontroller, the input end of the displacement signal source is electrically connected with the microcontroller, the input end of the alternating current signal source is electrically connected with the microcontroller, the output end of the alternating current signal source and the output end of the displacement signal source are electrically connected with the input end of the difference amplifier, the output end of the direct current signal source and the output end of the difference amplifier are electrically connected with the input end of the adder, and the output end of the adder is electrically connected with the linear voice coil motor through the current source;
the microcontroller is used for controlling the direct current signal source to send out a direct current signal so that the linear voice coil motor rotor is positioned at a central balance position, setting the alternating current signal source according to a given frequency and amplitude signal and controlling the alternating current signal source to provide a corresponding alternating current signal, receiving a digital displacement signal of the grating ruler by the microcontroller and converting the digital displacement signal into an analog displacement signal by the displacement signal source in real time, amplifying the alternating current signal provided by the alternating current signal source and the analog displacement signal through the differential amplifier to output a differential alternating current signal, superposing the differential alternating current signal and the direct current signal provided by the direct current signal source and converting a voltage into current through a current source to drive the linear voice coil motor rotor to vibrate up and down at the central position, and when the whole vibration system stably works, the frequency and the amplitude of the alternating current signal provided by the alternating current signal source and the analog displacement signal are equal.
2. The vibrating device for the vibrating sample magnetometer of claim 1, further comprising a sliding table, wherein an output shaft of the linear voice coil motor is connected with the sliding table and can vibrate up and down along the sliding table, and the grating ruler is mounted on the sliding table.
3. The vibrating device for vibrating a sample magnetometer of claim 1 or 2, characterized in that the difference amplifier is embodied as a first-order integrator.
4. A method for vibrating a vibrating sample magnetometer according to any one of claims 1 to 3, characterized in that the vibrating device of the vibrating sample magnetometer is vibration-controlled, a linear voice coil motor is used as a vibration source of the vibrating sample magnetometer,
Providing a corresponding direct current signal for the linear voice coil motor according to the gravity borne by the linear voice coil motor rotor, and enabling the linear voice coil motor rotor to be in a central balance position through the direct current signal;
simultaneously acquiring a digital displacement signal of the rotor vibration of the linear voice coil motor and converting the digital displacement signal into an analog displacement signal in real time;
The alternating current signal and the analog displacement signal are subjected to differential amplification processing to output a differential alternating current signal;
And superposing the difference alternating current signal and the direct current signal and driving the linear voice coil motor rotor to vibrate up and down at the central position.
5. The method for vibrating a vibrating sample magnetometer according to claim 4, wherein the DC signal is a DC voltage signal, and the linear voice coil motor rotor is positioned at a central balance position by the DC signal, and the method specifically comprises converting the DC signal from the DC voltage signal to a DC current signal, inputting the DC current signal to the linear voice coil motor, and driving the linear voice coil motor rotor at the central balance position.
6. The method for vibrating a vibrating sample magnetometer according to claim 5, characterized in that said alternating current signal is specifically an alternating current voltage signal, said difference alternating current signal is superimposed with said direct current signal to drive a linear voice coil motor mover to vibrate up and down at a central position, specifically comprising,
And superposing the difference alternating current signal and the direct current signal to obtain an alternating current-direct current mixed voltage signal, converting the alternating current-direct current mixed voltage signal into an alternating current-direct current mixed current signal, inputting the alternating current-direct current mixed current signal to the linear voice coil motor, and driving the linear voice coil motor rotor to vibrate up and down at the central position.
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| CN114852635A (en) * | 2022-05-11 | 2022-08-05 | 广州珐玛珈智能设备股份有限公司 | Vibration device |
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| CN106112159A (en) * | 2016-07-22 | 2016-11-16 | 盐城工学院 | The Electrolyzed Processing vibration feed device of a kind of Parameter adjustable and control method thereof |
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| US3496459A (en) * | 1967-05-10 | 1970-02-17 | Simon Foner | Vibrating sample magnetometers |
| JPH0933627A (en) * | 1995-07-19 | 1997-02-07 | Kagaku Gijutsu Kenkyusho:Kk | Sample vibration-type magnetometer |
| RU2339965C1 (en) * | 2007-06-09 | 2008-11-27 | Институт физики им. Л.В. Киренского Сибирского отделения РАН | Vibrating magnetometer |
| CN201583640U (en) * | 2009-12-17 | 2010-09-15 | 上海复旦天欣科教仪器有限公司 | Vibration sample magnetometer vibration source |
| KR101633306B1 (en) * | 2015-01-19 | 2016-07-08 | 이남규 | Vibrating actuator using a magnetic function of voice coil |
| JP2018084463A (en) * | 2016-11-22 | 2018-05-31 | 東英工業株式会社 | Vibrating sample magnetometer |
| CN107482957A (en) * | 2017-08-30 | 2017-12-15 | 深圳市圆梦精密技术研究院 | Linear motor control system and method |
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| CN102395432A (en) * | 2009-04-15 | 2012-03-28 | Thk株式会社 | Linear motor actuator |
| CN106112159A (en) * | 2016-07-22 | 2016-11-16 | 盐城工学院 | The Electrolyzed Processing vibration feed device of a kind of Parameter adjustable and control method thereof |
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