CN114814267B - Low-frequency expanding circuit of magnetoelectric speed sensor and control method - Google Patents
Low-frequency expanding circuit of magnetoelectric speed sensor and control method Download PDFInfo
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- CN114814267B CN114814267B CN202111679160.XA CN202111679160A CN114814267B CN 114814267 B CN114814267 B CN 114814267B CN 202111679160 A CN202111679160 A CN 202111679160A CN 114814267 B CN114814267 B CN 114814267B
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- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
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Abstract
The invention provides a low-frequency expanding circuit of a magnetoelectric speed sensor and a control method thereof, wherein the circuit comprises an ADA4666-2, a dial switch, a prefilter, a high-pass filter, a low-pass filter, a band-pass filter, an adder, a PCB circuit board and a shell; the output signal of the magnetoelectric speed sensor is subjected to pre-filtering, and then is summed to a low-frequency expanded signal through a second-order active high-pass filtering second-order active low-pass filter circuit and a second-order active band-pass filter circuit through a second-order active high-pass filtering second-order active low-pass filter circuit and an adder through the signals of the three filter circuits; after expansion, the center frequency of the sensor for measuring vibration is reduced to 0.28Hz from original 4.5Hz, the amplitude-frequency characteristic of the sensor can be kept smooth within the range of 0.28Hz to 100Hz, the signal attenuation of the sensor is compensated, the sensitivity of the sensor at the position is closer to the actual sensitivity, and the sensor has high stability and reliability, low power consumption, simple structure and low cost; the problem that the current magnetoelectric speed sensor can not detect low-frequency vibration is solved.
Description
Technical Field
The invention relates to the technical field of sensing and electronics, in particular to a low-frequency expanding circuit of a magnetoelectric speed sensor and a control method.
Background
In recent years, due to the development of scientific technology, the precision and stability of each instrument and equipment are continuously improved, the influence of various vibrations becomes more prominent, and the vibration isolation technology is increasingly paid attention to by people. The vibration sensor is an important component of the vibration isolation system, is the key for obtaining higher vibration isolation performance in active control, and whether the sensor can accurately obtain load vibration information becomes the most important factor for restricting the vibration isolation performance. Wherein the speed sensor plays a very critical role.
The velocity sensor obtains the velocity of the measured object by detecting the relative motion between the inertial mass and the housing, such as a magnetoelectric absolute velocity sensor. The magnetoelectric velocity sensor may also be referred to as an inertial absolute vibration velocity sensor, and may be used to detect absolute motion of an object. The magnetoelectric speed sensor generally comprises a rigid shell with sealing and protecting functions, a coil which is supported by an elastic support frame and is not in contact with other components, the elastic support frame, a permanent magnet and the like. The permanent magnet and the coil form a magnetic circuit system of the detector, and the elastic support frame, the coil, the sleeve and the shell form a vibration system of the whole sensor.
When vibration is generated from the outside, the shell can move along with the vibration of the outside, but due to the existence of the internal sensor elastic supporting piece and the tendency of inertia of the coil mass to keep still, the sensor shell generates relative motion, and due to the rigid connection between the internal permanent magnet and the sensor shell, the coil mass and the permanent magnet generate relative motion. When the relative motion of the coil mass block and the permanent magnet is generated, the coil can cut the magnetic induction lines, and the induction electromotive force can be generated at the two ends of the coil according to the electromagnetic induction principle. The magnetoelectric speed sensor converts the relative movement speed of the coil and the permanent magnet into a voltage signal proportional to the speed by using the principle of electromagnetic induction.
The magnetoelectric speed sensor has low output impedance, does not need power supply, is convenient to use, has high sensitivity and can measure micro vibration. However, the magnetoelectric velocity sensor has a high-pass characteristic, and therefore, it is difficult to accurately acquire the low-frequency and ultra-low-frequency band content of information using such a sensor. When the measured frequency is one twentieth of the center frequency of the magnetoelectric speed sensor, the output signal is only one fifth thousandth of the original signal, the signal attenuation is serious, the signal-to-noise ratio is reduced, and the signal-to-noise ratio is almost submerged in noise. Therefore, to acquire the vibration signal in a frequency band lower than the center frequency of the sensor, a compensation element must be added.
The passive compensation method is to connect capacitors in parallel at two ends of the sensor to increase the equivalent mass of the sensor, thereby reducing the equivalent natural frequency of the system and increasing the passband.
The feedback compensation method utilizes a feedback link to surround a link with poor dynamic performance of the sensor to form a feedback loop. The natural frequency of the network is reduced, but the damping ratio is also reduced while the natural frequency is reduced, and overshoot occurs when the damping ratio of the system is too low, so that the system is unstable.
The zero-pole compensation method is characterized in that a compensation link is connected in series, the zero point of the compensation link is equal to the pole of the sensor, and the zero point of the compensation link and the pole of the sensor are offset after the compensation link and the pole of the sensor are connected in series, so that the pole of the compensation link is used as the pole of the whole network, the frequency characteristic of the original network is changed, and the effect of low-frequency expansion is achieved. After expansion, the sensor has stable performance and good low-frequency vibration measurement effect.
Disclosure of Invention
Aiming at the problems, the invention provides a low-frequency expanding circuit and a control method of a magnetoelectric speed sensor; the compensation network is formed by connecting low-pass, high-pass and band-pass filters in parallel and summing through an adder.
The invention is realized by the following scheme:
a low frequency expanding circuit of a magnetoelectric speed sensor comprises:
the expansion circuit comprises a second-order active high-pass filter circuit, a first dual-channel rail-to-rail input/output amplifier, a second-order active low-pass filter circuit, a second active band-pass filter circuit, a second dual-channel rail-to-rail input/output amplifier, an adder and a third dual-channel rail-to-rail input/output amplifier;
the low-frequency expansion circuit filters output signals of the magnetoelectric speed sensor firstly, then processes the signals through a second-order active high-pass filter circuit, the processed signals are amplified through a first dual-channel rail-to-rail input/output amplifier, the amplified signals are transmitted to the second-order active low-pass filter circuit, the second-order active low-pass filter circuit processes the signals and transmits the processed signals to the second-order active band-pass filter circuit, the signals processed by the second-order active band-pass filter circuit are transmitted to a second dual-channel rail-to-rail input/output amplifier, the signals amplified by the second dual-channel rail-to-rail input/output amplifier are transmitted to an adder, the signals summed by the adder are transmitted to a third dual-channel rail-to-rail input/output amplifier, and the third dual-channel rail-to-rail input/output amplifier outputs the expanded signals.
Further, the first dual channel rail-to-rail input/output amplifier, the second dual channel rail-to-rail input/output amplifier and the third dual channel rail-to-rail input/output amplifier are all ADA4666-2 type amplifiers.
A PCB circuit board that magnetoelectric speedtransmitter's low frequency was extended:
the PCB circuit board comprises a pre-filter circuit, a dial switch and a low-frequency expanding circuit;
the pre-filter circuit filters the output signal of the magnetoelectric speed sensor firstly, and then the low-frequency expansion circuit outputs a low-frequency expansion signal.
Further, the PCB circuit board is mounted in the shell;
the housing also includes power and signal lines connected to the aircraft plug.
A control method of a low-frequency expanding circuit of a magnetoelectric speed sensor comprises the following steps:
the method specifically comprises the following steps:
the method comprises the following steps: pre-filtering an output signal of the magnetoelectric speed sensor through a pre-filtering circuit;
step two: filtering the signal obtained in the first step through a second-order active high-pass filter circuit, and amplifying the signal through a first dual-channel rail-to-rail input/output amplifier;
step three: filtering the signal obtained in the second step through a second-order active low-pass filter circuit;
step four: filtering the signal obtained in the third step through a second-order active band-pass filter circuit, and amplifying the signal through a second dual-channel rail-to-rail input/output amplifier;
step five: and summing the signals obtained in the step four through an adding/inverting amplification circuit of the adder, and amplifying the signals through a third dual-channel rail-to-rail input/output amplifier to finally obtain the signals after low-frequency expansion.
An electronic device comprising a memory storing a computer program and a processor implementing the steps of the above method when executing the computer program.
A computer readable storage medium storing computer instructions which, when executed by a processor, implement the steps of the above-described method.
The invention has the beneficial effects
The central frequency of the measured vibration is reduced to 0.28Hz from the original 4.5Hz, the amplitude-frequency characteristic of the sensor can be kept smooth within the range of 0.28Hz to 100Hz, the signal attenuation of the sensor is compensated, the sensitivity of the sensor at the position is closer to the actual sensitivity, and the invention has high stability and reliability, low power consumption, simple structure and low cost; the problem that the current magnetoelectric speed sensor can not detect low-frequency vibration is solved.
Drawings
FIG. 1 is a second order active high pass/low pass filter circuit of the present invention;
FIG. 2 is a second order active band pass filter/inverting amplifier circuit of the present invention;
FIG. 3 is a schematic diagram of an adder/inverter circuit according to the present invention;
FIG. 4 is a pre-filter circuit of the present invention;
FIG. 5 is a toggle switch of the present invention;
fig. 6 is a low frequency expanding circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In conjunction with the figures 1 to 6,
a low frequency expanding circuit of a magnetoelectric speed sensor comprises:
the expansion circuit comprises a second-order active high-pass filter circuit, a first dual-channel rail-to-rail input/output amplifier, a second-order active low-pass filter circuit, a second active band-pass filter circuit, a second dual-channel rail-to-rail input/output amplifier, an adder and a third dual-channel rail-to-rail input/output amplifier;
the low-frequency expansion circuit filters output signals of the magnetoelectric speed sensor firstly, then processes the signals through a second-order active high-pass filter circuit, the processed signals are amplified through a first dual-channel rail-to-rail input/output amplifier, the amplified signals are transmitted to the second-order active low-pass filter circuit, the second-order active low-pass filter circuit processes the signals and transmits the processed signals to the second-order active band-pass filter circuit, the signals processed by the second-order active band-pass filter circuit are transmitted to a second dual-channel rail-to-rail input/output amplifier, the signals amplified by the second dual-channel rail-to-rail input/output amplifier are transmitted to an adder, the signals summed by the adder are transmitted to a third dual-channel rail-to-rail input/output amplifier, and the third dual-channel rail-to-rail input/output amplifier outputs the expanded signals.
The first dual channel rail-to-rail input/output amplifier, the second dual channel rail-to-rail input/output amplifier and the third dual channel rail-to-rail input/output amplifier are both ADA4666-2 type amplifiers.
A PCB circuit board that magnetoelectric speedtransmitter's low frequency was extended:
the PCB circuit board comprises a pre-filter circuit, a dial switch and a low-frequency expanding circuit;
the pre-filter circuit filters the output signal of the magnetoelectric speed sensor firstly, and then outputs a low-frequency expansion signal through the low-frequency expansion circuit.
The PCB circuit board is arranged in the shell;
the housing also includes power and signal lines connected to the aircraft plug.
A control method of a low-frequency expanding circuit of a magnetoelectric speed sensor comprises the following steps:
the method specifically comprises the following steps:
the method comprises the following steps: pre-filtering an output signal of the magnetoelectric speed sensor through a pre-filtering circuit;
step two: filtering the signal obtained in the step one through a second-order active high-pass filter circuit, and amplifying the signal through a first dual-channel rail-to-rail input/output amplifier;
step three: filtering the signal obtained in the second step through a second-order active low-pass filter circuit;
step four: filtering the signal obtained in the step three through a second-order active band-pass filter circuit, and amplifying the signal through a second dual-channel rail-to-rail input/output amplifier;
step five: and summing the signals obtained in the step four through an adding/inverting amplification circuit of the adder, and amplifying the signals through a third dual-channel rail-to-rail input/output amplifier to finally obtain the signals after low-frequency expansion.
The PCB is fabricated according to the signal processing circuitry shown in fig. 4, 5 and 6, and then the PCB circuit board is mounted in the housing with power and signal lines connected to the air plug.
Output signals of the magnetoelectric speed sensor are filtered firstly, then the signals of the three filters are summed by an adder shown in the left side of figure 3 through a second-order active high-pass filter circuit shown in the left side of figure 1, a second-order active low-pass filter circuit shown in the right side of figure 1 and a second-order active band-pass filter circuit shown in the left side of figure 2, signals after low-frequency expansion are obtained, and electric signals generated by the speed sensor due to low-frequency vibration can be obtained through the low-frequency expansion circuit.
An electronic device comprising a memory storing a computer program and a processor implementing the steps of the above method when executing the computer program.
A computer readable storage medium storing computer instructions which, when executed by a processor, implement the steps of the above-described method.
The low-frequency expanding circuit and the control method of the magnetoelectric speed sensor provided by the invention are introduced in detail, the principle and the implementation mode of the invention are explained, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. A control method of a low-frequency expanding circuit of a magnetoelectric speed sensor is characterized by comprising the following steps:
the expansion circuit comprises a second-order active high-pass filter circuit, a first dual-channel rail-to-rail input/output amplifier, a second-order active low-pass filter circuit, a second active band-pass filter circuit, a second dual-channel rail-to-rail input/output amplifier, an adder and a third dual-channel rail-to-rail input/output amplifier;
the low-frequency expansion circuit filters output signals of the magnetoelectric speed sensor firstly, then processes the signals through a second-order active high-pass filter circuit, the processed signals are amplified through a first dual-channel rail-to-rail input/output amplifier, the amplified signals are transmitted to the second-order active low-pass filter circuit, the second-order active low-pass filter circuit processes the signals and transmits the processed signals to the second-order active band-pass filter circuit, the signals processed by the second-order active band-pass filter circuit are transmitted to a second dual-channel rail-to-rail input/output amplifier, the signals amplified by the second dual-channel rail-to-rail input/output amplifier are transmitted to an adder, the signals summed by the adder are transmitted to a third dual-channel rail-to-rail input/output amplifier, and the third dual-channel rail-to-rail input/output amplifier outputs expanded signals;
the method specifically comprises the following steps:
the method comprises the following steps: pre-filtering an output signal of the magnetoelectric speed sensor through a pre-filtering circuit;
step two: filtering the signal obtained in the step one through a second-order active high-pass filter circuit, and amplifying the signal through a first dual-channel rail-to-rail input/output amplifier;
step three: filtering the signal obtained in the second step through a second-order active low-pass filter circuit;
step four: filtering the signal obtained in the step three through a second-order active band-pass filter circuit, and amplifying the signal through a second dual-channel rail-to-rail input/output amplifier;
step five: and summing the signals obtained in the step four through an adding/inverting amplification circuit of the adder, and amplifying the signals through a third dual-channel rail-to-rail input/output amplifier to finally obtain the signals after low-frequency expansion.
2. The control method of the low frequency expanding circuit according to claim 1, characterized in that:
the first dual channel rail-to-rail input/output amplifier, the second dual channel rail-to-rail input/output amplifier and the third dual channel rail-to-rail input/output amplifier are both ADA4666-2 type amplifiers.
3. The utility model provides a PCB circuit board that magnetoelectric speedtransmitter's low frequency was extended which characterized in that:
steps for implementing the method of any one of claims 1 to 2;
the PCB circuit board comprises a pre-filter circuit, a dial switch and a low-frequency expanding circuit;
the pre-filter circuit filters the output signal of the magnetoelectric speed sensor firstly, and then the low-frequency expansion circuit outputs a low-frequency expansion signal.
4. The PCB circuit board of claim 3, wherein:
the PCB circuit board is arranged in the shell;
the housing also includes power and signal lines connected to the aircraft plugs.
5. An electronic device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 2 when executing the computer program.
6. A computer readable storage medium storing computer instructions which, when executed by a processor, carry out the steps of the method of any one of claims 1 to 2.
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| CN202111679160.XA CN114814267B (en) | 2021-12-31 | 2021-12-31 | Low-frequency expanding circuit of magnetoelectric speed sensor and control method |
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| CN202111679160.XA CN114814267B (en) | 2021-12-31 | 2021-12-31 | Low-frequency expanding circuit of magnetoelectric speed sensor and control method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202631100U (en) * | 2012-03-27 | 2012-12-26 | 浙江师范大学 | Ultralow frequency absolute vibrating sensor amplitude-frequency characteristic compensating circuit |
| CN104330149A (en) * | 2014-10-22 | 2015-02-04 | 白山发电厂 | Hydropower station set vibration measurement monitoring method |
| CN205209625U (en) * | 2015-11-09 | 2016-05-04 | 北京中元瑞讯科技有限公司 | Digital low frequency vibration sensor |
| CN208333664U (en) * | 2018-07-05 | 2019-01-04 | 淮阴师范学院 | A kind of vibrating speed sensors hardware compensating circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181119A (en) * | 2015-10-30 | 2015-12-23 | 陕西中爆安全网科技有限公司 | Ultra-low frequency implementation method of magneto-electric intelligent digital vibration velocity sensor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202631100U (en) * | 2012-03-27 | 2012-12-26 | 浙江师范大学 | Ultralow frequency absolute vibrating sensor amplitude-frequency characteristic compensating circuit |
| CN104330149A (en) * | 2014-10-22 | 2015-02-04 | 白山发电厂 | Hydropower station set vibration measurement monitoring method |
| CN205209625U (en) * | 2015-11-09 | 2016-05-04 | 北京中元瑞讯科技有限公司 | Digital low frequency vibration sensor |
| CN208333664U (en) * | 2018-07-05 | 2019-01-04 | 淮阴师范学院 | A kind of vibrating speed sensors hardware compensating circuit |
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