CN111060229A - Signal processing method and device - Google Patents
Signal processing method and device Download PDFInfo
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- CN111060229A CN111060229A CN201911378078.6A CN201911378078A CN111060229A CN 111060229 A CN111060229 A CN 111060229A CN 201911378078 A CN201911378078 A CN 201911378078A CN 111060229 A CN111060229 A CN 111060229A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/12—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/16—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in the magnetic properties of material resulting from the application of stress
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/02—Details
- H03D1/06—Modifications of demodulators to reduce distortion, e.g. by negative feedback
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Abstract
The application discloses a signal processing method and a signal processing device, which comprise the following steps: converting external pressure into an amplitude modulation signal with an excitation signal as a carrier and a compression period of the piezomagnetic sensor under external force as a modulation frequency by using the piezomagnetic sensor; and demodulating the obtained amplitude modulation signal to obtain an amplitude modulation envelope signal corresponding to the external pressure. The sensor is ingeniously designed according to the working principle of the piezomagnetic sensor, realizes simple detection and processing of signals based on the piezomagnetic sensor, and has wide practicability.
Description
Technical Field
The present application relates to, but not limited to, sensor technology, and more particularly, to a signal processing method and apparatus.
Background
There are many types of pressure sensors, of which a piezomagnetic sensor is one.
The piezomagnetic sensor is made by stacking and bonding cold-rolled silicon steel sheets, and the working principle of the sensor generally comprises the following steps: when the piezomagnetic sensor is acted by an external force F, the magnetic conductivity inside the material can be changed with a certain rule along with the macroscopic stress; the magnetic permeability is converted into a voltage signal or a current signal which can be simply measured along with the change of the magnitude of the external force through signal conversion, so that the measurement of the external force F is realized.
The piezomagnetic sensor has strong anti-interference capability and larger output power, can bear stronger overload, and can stably work for a long time in extremely severe environment, thereby being widely applied to industries such as mining machinery, petrifaction, transportation industry (weighing), metallurgy, hydraulic pressure, road and bridge, building and the like.
Disclosure of Invention
The application provides a signal processing method and a signal processing device, which can realize simple detection and processing of signals based on a piezomagnetic sensor and have wide practicability.
The embodiment of the invention provides a signal processing method, which comprises the following steps:
converting external pressure into an amplitude modulation signal with an excitation signal as a carrier and a compression period of the piezomagnetic sensor under external force as a modulation frequency by using the piezomagnetic sensor;
and demodulating the obtained amplitude modulation signal to obtain an amplitude modulation envelope signal corresponding to the external pressure.
In an exemplary embodiment, before performing the demodulation processing on the obtained amplitude modulation signal, the method further includes:
and amplifying the amplitude modulation signal.
In one illustrative example, the excitation signal is a sinusoidal periodic signal.
In an exemplary embodiment, the converting the external pressure into an amplitude modulation signal with the excitation signal as a carrier wave and the compression period of the piezomagnetic sensor under the external force as a modulation frequency by using the piezomagnetic sensor includes:
under the action of the sine periodic excitation signal, the piezomagnetic sensor converts the received external pressure into a same-frequency sine wave, wherein the same-frequency sine wave is the amplitude modulation signal which takes the sine periodic excitation signal as a carrier wave and takes the compression period of the piezomagnetic sensor under the external force as a modulation frequency.
In an exemplary embodiment, the demodulating the obtained amplitude modulation signal includes:
demodulating the obtained amplitude modulation signal to obtain a demodulation signal comprising a low-frequency modulation signal and a carrier component;
and filtering the obtained demodulation signal to obtain a low-frequency modulation signal, wherein the low-frequency modulation signal is the amplitude modulation envelope signal of the external pressure.
In one illustrative example, the method further comprises:
and adjusting the output reference of the piezomagnetic sensor so as to correct the initial output quantity of the piezomagnetic sensor to be zero.
In one illustrative example, the method further comprises:
and carrying out precise rectification processing on the amplitude-modulated envelope signal, and converting the amplitude-modulated envelope signal into a positive voltage signal.
The present application also provides a signal processing apparatus, including: a signal extraction unit and a signal processing unit; wherein the content of the first and second substances,
the signal extraction unit is used for converting external pressure into an amplitude modulation signal which takes the excitation signal as a carrier wave and takes the compression period of the piezomagnetic sensor subjected to external force as modulation frequency by using the piezomagnetic sensor;
and the signal processing unit is used for demodulating the obtained amplitude modulation signal to obtain an amplitude modulation envelope signal corresponding to the external pressure.
In one illustrative example, the signal extraction unit includes: a piezomagnetic sensor and an excitation signal generator; wherein the content of the first and second substances,
a piezomagnetic sensor for receiving an external pressure; under the action of an excitation signal, converting the received external pressure into a same-frequency signal wave, wherein the same-frequency signal wave is an amplitude modulation signal which takes the excitation signal as a carrier wave and the rotation period of the roller as a modulation frequency;
and the excitation signal generator is used for generating the excitation signal and serving as an input signal of the piezomagnetic sensor.
In one illustrative example, the excitation signal is a sinusoidal periodic signal.
In one illustrative example, the signal processing unit includes: the demodulation module and the filtering module; wherein the content of the first and second substances,
the demodulation module is used for demodulating the obtained amplitude modulation signal to obtain a demodulation signal comprising a low-frequency modulation signal and a carrier component;
and the filtering module is used for filtering the obtained demodulation signal to obtain a low-frequency modulation signal, wherein the low-frequency modulation signal is the amplitude modulation envelope signal of the external pressure.
In one illustrative example, the signal processing unit further includes: and the amplifying module is used for amplifying the obtained amplitude modulation signal.
In one illustrative example, the signal processing unit further includes: and the calibration module is used for adjusting the output reference of the piezomagnetic sensor so as to correct the initial output quantity of the piezomagnetic sensor to be zero.
In one illustrative example, the calibration module is a subtraction circuit.
In one illustrative example, the signal processing unit further includes: and the precise rectification module is used for precisely rectifying the amplitude-modulated envelope signal and converting the amplitude-modulated envelope signal into a positive voltage signal.
The sensor is ingeniously designed according to the working principle of the piezomagnetic sensor, realizes simple detection and processing of signals based on the piezomagnetic sensor, and has wide practicability.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
FIG. 1 is a schematic diagram of a related art medium voltage magnetic sensor;
FIG. 2 is a schematic circuit diagram of an equivalent principle of a medium voltage magnetic sensor in the related art;
FIG. 3 is a circuit diagram of a related art in which two piezomagnetic sensors are connected in series to a force measurement circuit;
FIG. 4 is a schematic view illustrating an installation of a magneto-resistive sensor according to the related art;
FIG. 5 is a schematic diagram of a typical application condition of a medium-voltage magnetic sensor in the related art;
FIG. 6 is a schematic waveform diagram of the input and output signals of the piezomagnetic sensor in FIG. 3;
FIG. 7 is a schematic flow chart of a signal processing method according to the present application;
FIG. 8 is a schematic diagram of an embodiment of a circuit for demodulating an amplitude modulated signal according to the present application;
FIG. 9 is a schematic diagram of an embodiment of an amplitude modulated envelope signal corresponding to an external pressure F under exemplary operating conditions of the present application;
FIG. 10 is a schematic diagram of a waveform of a positive voltage signal after a precision rectification process according to the present application;
fig. 11 is a schematic diagram of a signal processing apparatus according to the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Fig. 1 is a schematic diagram of an external shape of a medium voltage magnetic sensor in the related art, where the leads shown in fig. 1 are input end leads and output end leads, the medium voltage magnetic sensor is equivalent to a transformer (or referred to as a transformer), the magnitude of the mutual inductance M of the medium voltage magnetic sensor changes with the external pressure, a physical model is shown in fig. 2, and fig. 2 is an equivalent schematic circuit diagram of the medium voltage magnetic sensor in the related art. When an ac excitation signal is applied to the input (also called primary) lead, a corresponding ac signal u is induced in the output (also called secondary) lead.
According to the different designs of the same-name ends of the mutual inductor shown in fig. 2, a simple and practical pressure testing system can be formed by adopting a specific series connection mode of two or four piezomagnetic sensors, fig. 3 is a circuit schematic diagram of series force measurement of the two piezomagnetic sensors in the related art, and as shown in fig. 3, an equivalent circuit is shown after the two piezomagnetic sensors (one upper and one lower) are connected in series in a mode of opposite same-name ends, and an alternating current excitation signal u is applied to the primary sides of the two series sensorsinThe output signal u can be obtained at the sensor secondary sideout. AC excitation signal uinAnd the output signal uoutThe mathematical relationship of (a) is described as follows:
when the sensor does not receive external force compression, according to the end label condition of the same name of two mutual-inductors, then there:
when one of the sensors is subjected to an applied pressure, there are:
when the sensor located above is under pressure,
when the sensor located below is under pressure,
the secondary output signal of the sensor compressed by the external force changes due to the change of the mutual inductance M, which is equivalent to that an increment delta u with the same frequency as the input signal is superposed on the basis of the normal output quantity of the sensor. That is, the magnitude of the external force F can be reversely estimated by detecting the magnitude of Δ u.
One typical application of the piezomagnetic sensor is in the steel rolling industry, and is used for measuring the pressure of a roll. Fig. 4 is a schematic diagram of the installation position of the piezomagnetic sensor in the roll in the related art, and dozens of groups (for example, a group of two or four sensors connected in series) of piezomagnetic sensors (as shown by small black dots in fig. 4) are uniformly arranged in the roll according to the width of a rolled steel plate, and are used for measuring the pressure applied to different positions of the roll body of the roll. Fig. 5 is a schematic diagram of a typical application condition of a piezomagnetic sensor in the related art, as shown in fig. 5, the rotation speed of the roll is typically several to several tens of revolutions per second (typically less than 30 revolutions).
For the typical operating condition of the piezomagnetic sensor shown in fig. 5, the inventors of the present application found that:
the piezomagnetic sensor is applied by a periodic external pressure F, and the applied frequency is generally less than 30 HZ; the external pressure F is a gradual change process from small to large to maximum and then gradually from large to small to zero; in order to simplify the signal processing, as shown in fig. 3, the piezomagnetic sensors can be used in groups (two or four in groups are connected in series), and are matched with the same-name ends of the mutual inductor, so that when no external force is applied, the output signal of the whole piezomagnetic sensor group is zero.
As mentioned above, considering that the equivalent circuit model of the piezomagnetic sensor is a mutual inductor, the excitation signal applied to the piezomagnetic sensor should be an ac signal, so that the corresponding sensing output signal can be obtained at the output end of the piezomagnetic sensor. The alternating current signal has many types, and the inventor of the present application believes that, from the viewpoint of signal spectrum, the alternating current signal in the present application may preferably be selected from a sinusoidal periodic signal because the frequency spectrum of the sinusoidal periodic signal is the simplest. Furthermore, the sinusoidal periodic signal is convenient to obtain, to process by circuit filtering and the like, and is not easy to generate high-frequency interference, and the frequency of the sinusoidal periodic signal is assumed to be CW hertz (Hz) (CW is an acronym for carrier wave).
According to the analysis of fig. 3, in the process of measuring the force of the steel rolling under the typical working condition, the piezomagnetic sensor is compressed by the periodic gradual-change force F, and when the piezomagnetic sensor is not applied by an external force, the output signal is zero. The action of the applied pressure F causes the form of the output signal of the sensor to become an amplitude modulation of the sinusoidal periodic signal, so that the output signal of the piezomagnetic sensor is actually an amplitude modulated wave of the sinusoidal signal. The carrier frequency of the amplitude modulated wave is CW Hz, the frequency of the amplitude modulated signal is less than 30Hz, and the waveform is shown in fig. 6, wherein the waveform at the top shows the carrier signal and the waveform at the bottom shows the output signal of the piezomagnetic sensor group. From the above analysis, the inventors of the present application have considered that the applied pressure F can be obtained by extracting the envelope signal of the amplitude modulated wave by an appropriate method.
Aiming at the typical application working conditions of the piezomagnetic sensor, the application provides a signal processing method. It should be noted that, for convenience of description, the steel rolling force measurement working condition is only taken as an example for explanation, and the application is also applicable to other working conditions, such as a fixed pressure measurement occasion and the like.
Amplitude modulation signals are common signal types in the field of wireless communication, the carrier signal frequency in the field of wireless communication is usually very high (generally, above dozens to hundreds of megahertz, related to the sizes of antennas of a transmitter and a receiver), and nonlinear circuit components such as a high-frequency oscillator, a mixer, a detector and the like are used for signal demodulation. For the typical application condition of the piezomagnetic sensor, because the frequency of the piezomagnetic sensor output signal modulated by pressure is very low (usually less than 30hz), the frequency of the sinusoidal periodic signal as the carrier of such pressure signal can be set within the range of 1Khz to 10Khz, fig. 7 is a flow chart of the signal processing method of the present application, as shown in fig. 7, including:
step 700: the external pressure is converted into an amplitude modulation signal by using the exciting signal as a carrier wave and the compression period of the piezomagnetic sensor under the external force as a modulation frequency by using the piezomagnetic sensor.
By this step, the electrical signal corresponding to the external pressure F, i.e. the amplitude modulation signal, is reflected.
In an exemplary embodiment, for a rolled steel load-measuring condition, for example, the compression period of the piezomagnetic sensor by an external force is the rotation period of the roll.
In one illustrative example, the excitation signal is a sinusoidal periodic signal.
In one illustrative example, the step may include:
the piezomagnetic sensor receives a sine periodic excitation signal;
under the action of the sine periodic excitation signal, the received external pressure is converted into a same-frequency sine wave, and the same-frequency sine wave is an amplitude modulation signal which takes the sine periodic excitation signal as a carrier wave and takes the compression period (such as the roller rotation period) of the piezomagnetic sensor under the external force as a modulation frequency.
In one illustrative example, a periodic sinusoidal excitation signal may be provided to a piezomagnetic sensor using an excitation signal generator, such as a sine wave generation circuit, having an amplitude and power. It should be noted that, according to the actual application scenario, the amplitude and power of the excitation signal may be different according to the model of the piezomagnetic sensor. Such as: the excitation signal can be an excitation signal with the voltage of 3-5V and the current of about 30-50 mA.
In one illustrative example, a sine wave generation circuit having an amplitude and power may include: the device comprises a signal generating module and a signal amplifying module; wherein the content of the first and second substances,
and the signal generating module is used for generating a sinusoidal periodic signal, such as a frequency of 1 KHz.
And the signal amplification module is used for amplifying the generated sinusoidal periodic signal so as to improve the load carrying capacity of the signal.
In an exemplary embodiment, the signal generating module may be implemented by a signal generating chip, such as an ICL 8038.
In an exemplary embodiment, the signal amplification module may be implemented by using an audio power amplifier chip, such as TDA 7294.
The amplitude modulation signal obtained in the step reflects the magnitude of the pressure sensed by the piezomagnetic sensor.
In an exemplary embodiment, the frequency of the sinusoidal periodic excitation signal may be, for example, 1Khz, as determined by analysis and experimentation. After the piezomagnetic sensor inputs the sinusoidal periodic excitation signal, the output end of the piezomagnetic sensor can induce a same-frequency sinusoidal wave, so that when the piezomagnetic sensors are used in a group in series in a specific connection manner, such as the example shown in fig. 3, the waveform of the output signal of the piezomagnetic sensor group subjected to periodic compression is as shown in the lower waveform of fig. 6.
Step 701: and demodulating the obtained amplitude modulation signal to obtain an amplitude modulation envelope signal corresponding to the external pressure.
Through the step, the signal corresponding to the pressure is converted into the voltage with certain amplitude and power to be output.
The core task of this step is to demodulate the low-frequency signal corresponding to the external pressure applied to the piezomagnetic sensor, i.e. the envelope of the signal shown below fig. 6.
In one illustrative example, the steps include:
demodulating the obtained amplitude modulation signal to obtain a demodulation signal comprising a low-frequency modulation signal and a carrier component;
and filtering the obtained demodulation signal to obtain a low-frequency modulation signal.
In an exemplary example, a high-precision balanced modulator/demodulator chip such as the AD630 or the like may be employed to achieve demodulation of the resulting amplitude-modulated signal, obtaining a demodulated signal including a low-frequency modulated signal and a carrier component.
The AD630 chip can realize the functions of signal demodulation, synchronous detection, phase-locked amplification and the like, has unequal application range of the frequency of the processed signal from direct current to 2Mhz, and has high precision. Fig. 8 is a schematic diagram of an embodiment of a circuit for implementing amplitude modulation signal demodulation according to the present application, as shown in fig. 8, when demodulating an amplitude modulation signal subjected to pressure modulation, an AD630 further needs to input a reference signal related to a carrier signal, so as to accurately demodulate the modulated signal, in an example, a sinusoidal periodic excitation signal, i.e., a carrier signal, which is input to a piezomagnetic sensor may be directly used as the reference signal, as shown in a Sel pin of an AD630 chip in fig. 8, so that a signal output through the AD630 chip includes a low-frequency modulation signal (less than 30hz) and a carrier component (1 Khz);
in an exemplary embodiment, the filtering process of the obtained demodulated signal to obtain the low frequency modulated signal includes:
the obtained demodulated signal is processed by a low-pass filter circuit, and a carrier component is filtered out to obtain a low-frequency modulated signal, where the low-frequency modulated signal is an amplitude-modulated envelope signal of the external pressure F, as shown in fig. 9, and fig. 9 is a schematic diagram of an embodiment of the amplitude-modulated envelope signal corresponding to the external pressure F, which is taken as an example of a typical working condition of the piezomagnetic sensor in this application.
The signal processing method is ingeniously designed according to the working principle of the piezomagnetic sensor, realizes simple detection and processing of the piezomagnetic sensor-based signal, and has wide practicability.
In an exemplary embodiment, step 701 further includes, before: and amplifying the obtained amplitude modulation signal.
In an exemplary embodiment, the schematic diagram of the circuit embodiment shown in fig. 8 may further include: a pre-amplifier circuit, configured to amplify the obtained amplitude modulation signal, as shown in fig. 8, in this embodiment, amplification of the obtained amplitude modulation signal is implemented by using an OP07 operational amplifier, for example.
It should be noted that, on the basis of the above description of the present application, the connection of the specific circuit in fig. 8 is easily understood by those skilled in the art, and is not described herein again.
The signal processing method is ingeniously designed according to the working principle of the piezomagnetic sensor, realizes simple detection and processing of the piezomagnetic sensor-based signal, and has wide practicability.
In an illustrative example, the signal processing method of the present application further includes:
the output reference of the piezomagnetic sensor is adjusted to correct the initial output of the piezomagnetic sensor to zero.
After the piezomagnetic sensor is installed, when external pressure is not applied yet, the piezomagnetic sensor is subjected to a fixed pre-pressure (or referred to as a base pressure), so that an initial output signal of the piezomagnetic sensor is possibly not zero, and adjusting an output reference of the piezomagnetic sensor is to correct the initial output quantity of the piezomagnetic sensor to be zero.
In one illustrative example, a calibration circuit can be employed to achieve rejection of a base pressure experienced by a piezomagnetic sensor. In one illustrative example, the calibration circuit may be a subtraction circuit.
In an illustrative example, the signal processing method of the present application further includes:
and carrying out precise rectification processing on the amplitude-modulated envelope signal, and converting the amplitude-modulated envelope signal into a positive voltage signal. That is, the output signal waveform shown in fig. 9 is converted into a positive voltage signal shown in fig. 10, which facilitates subsequent a/D conversion and the like.
In one illustrative example, the conversion of the amplitude modulated envelope signal to a positive voltage signal may be accomplished using a precision rectifier circuit.
Fig. 11 is a schematic diagram of a signal processing apparatus according to the present application, as shown in fig. 11, at least including: a signal extraction unit and a signal processing unit; wherein the content of the first and second substances,
the signal extraction unit is used for converting external pressure into an amplitude modulation signal which takes the excitation signal as a carrier wave and takes the compression period of the piezomagnetic sensor subjected to external force as modulation frequency by using the piezomagnetic sensor;
and the signal processing unit is used for demodulating the obtained amplitude modulation signal to obtain an amplitude modulation envelope signal corresponding to the external pressure.
In an exemplary embodiment, for a rolled steel load-measuring condition, for example, the compression period of the piezomagnetic sensor by an external force is the rotation period of the roll.
In one illustrative example, the excitation signal may include, for example: a sinusoidal periodic signal, etc.
In one illustrative example, the signal extraction unit includes: a piezomagnetic sensor and an excitation signal generator; wherein the content of the first and second substances,
a piezomagnetic sensor for receiving an external pressure; under the action of the excitation signal, converting the received external pressure into a same-frequency signal wave, wherein the same-frequency signal wave is an amplitude modulation signal which takes the excitation signal as a carrier wave and takes the rotation period of the roller as a modulation frequency;
and the excitation signal generator is used for generating an excitation signal and serving as an input signal of the piezomagnetic sensor.
In one illustrative example, the excitation signal generator may be a sine wave generating circuit having an amplitude and power, in which case the excitation signal is a sinusoidal periodic excitation signal.
In one illustrative example, the excitation signal generator may include: a signal generation module and a signal amplification module (not shown in fig. 11); wherein the content of the first and second substances,
and the signal generating module is used for generating a sinusoidal periodic signal, such as a frequency of 1 KHz.
And the signal amplification module is used for amplifying the generated sinusoidal periodic signal so as to improve the load carrying capacity of the signal.
In an exemplary embodiment, the signal generating module may be implemented by a signal generating chip, such as an ICL 8038.
In an exemplary embodiment, the signal amplification module may be implemented by using an audio power amplifier chip, such as TDA 7294.
In one illustrative example, the signal processing unit includes: the demodulation module and the filtering module; wherein the content of the first and second substances,
the demodulation module is used for demodulating the obtained amplitude modulation signal to obtain a demodulation signal comprising a low-frequency modulation signal and a carrier component;
and the filtering module is used for filtering the obtained demodulation signal to obtain a low-frequency modulation signal, wherein the low-frequency modulation signal is the amplitude modulation envelope signal of the external pressure.
In one illustrative example, the excitation signal, i.e., the carrier signal, which is the input to the piezomagnetic sensor can be used as the reference signal.
In an exemplary example, a high-precision balanced modulator/demodulator chip such as the AD630 or the like may be employed to achieve demodulation of the resulting amplitude-modulated signal, obtaining a demodulated signal including a low-frequency modulated signal and a carrier component.
In one illustrative example, the filter module may be a low pass filter circuit.
In one illustrative example, the signal processing unit further includes: and the amplifying module is used for amplifying the obtained amplitude modulation signal.
In an exemplary embodiment, the amplification module may employ an OP07 OP amp, for example, to achieve amplification of the resulting amplitude modulated signal.
In one illustrative example, the signal processing unit further includes: and the calibration module is used for adjusting the output reference of the piezomagnetic sensor so as to correct the initial output quantity of the piezomagnetic sensor to be zero.
In one illustrative example, the calibration circuit may be a subtraction circuit.
In one illustrative example, the signal processing unit further includes: and the precise rectification module is used for precisely rectifying the amplitude-modulated envelope signal and converting the amplitude-modulated envelope signal into a positive voltage signal.
The signal processing device is simple and practical, is ingeniously designed according to the working principle of the piezomagnetic sensor, realizes simple detection and processing on the signal based on the piezomagnetic sensor, and has wide practicability.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (15)
1. A signal processing method, comprising:
converting external pressure into an amplitude modulation signal with an excitation signal as a carrier and a compression period of the piezomagnetic sensor under external force as a modulation frequency by using the piezomagnetic sensor;
and demodulating the obtained amplitude modulation signal to obtain an amplitude modulation envelope signal corresponding to the external pressure.
2. The signal processing method according to claim 1, further comprising, before performing the demodulation processing on the obtained amplitude-modulated signal:
and amplifying the amplitude modulation signal.
3. A signal processing method according to claim 1 or 2, wherein the excitation signal is a sinusoidal periodic signal.
4. The signal processing method according to claim 3, wherein the converting the external pressure into the amplitude modulation signal with the excitation signal as a carrier wave and the compression period of the piezomagnetic sensor under the external force as a modulation frequency by using the piezomagnetic sensor comprises:
under the action of the sine periodic excitation signal, the piezomagnetic sensor converts the received external pressure into a same-frequency sine wave, wherein the same-frequency sine wave is the amplitude modulation signal which takes the sine periodic excitation signal as a carrier wave and takes the compression period of the piezomagnetic sensor under the external force as a modulation frequency.
5. The signal processing method according to claim 1 or 2, wherein the performing demodulation processing on the obtained amplitude modulation signal comprises:
demodulating the obtained amplitude modulation signal to obtain a demodulation signal comprising a low-frequency modulation signal and a carrier component;
and filtering the obtained demodulation signal to obtain a low-frequency modulation signal, wherein the low-frequency modulation signal is the amplitude modulation envelope signal of the external pressure.
6. The signal processing method of claim 1 or 2, the method further comprising:
and adjusting the output reference of the piezomagnetic sensor so as to correct the initial output quantity of the piezomagnetic sensor to be zero.
7. The signal processing method of claim 1 or 2, the method further comprising:
and carrying out precise rectification processing on the amplitude-modulated envelope signal, and converting the amplitude-modulated envelope signal into a positive voltage signal.
8. A signal processing apparatus comprising: a signal extraction unit and a signal processing unit; wherein the content of the first and second substances,
the signal extraction unit is used for converting external pressure into an amplitude modulation signal which takes the excitation signal as a carrier wave and takes the compression period of the piezomagnetic sensor subjected to external force as modulation frequency by using the piezomagnetic sensor;
and the signal processing unit is used for demodulating the obtained amplitude modulation signal to obtain an amplitude modulation envelope signal corresponding to the external pressure.
9. The signal processing apparatus of claim 8, wherein the signal extraction unit comprises: a piezomagnetic sensor and an excitation signal generator; wherein the content of the first and second substances,
a piezomagnetic sensor for receiving an external pressure; under the action of an excitation signal, converting the received external pressure into a same-frequency signal wave, wherein the same-frequency signal wave is an amplitude modulation signal which takes the excitation signal as a carrier wave and the rotation period of the roller as a modulation frequency;
and the excitation signal generator is used for generating the excitation signal and serving as an input signal of the piezomagnetic sensor.
10. The signal processing apparatus of claim 9, the excitation signal being a sinusoidal periodic signal.
11. The signal processing apparatus of claim 8, wherein the signal processing unit comprises: the demodulation module and the filtering module; wherein the content of the first and second substances,
the demodulation module is used for demodulating the obtained amplitude modulation signal to obtain a demodulation signal comprising a low-frequency modulation signal and a carrier component;
and the filtering module is used for filtering the obtained demodulation signal to obtain a low-frequency modulation signal, wherein the low-frequency modulation signal is the amplitude modulation envelope signal of the external pressure.
12. The signal processing apparatus of claim 11, the signal processing unit further comprising: and the amplifying module is used for amplifying the obtained amplitude modulation signal.
13. The signal processing apparatus of claim 11, the signal processing unit further comprising: and the calibration module is used for adjusting the output reference of the piezomagnetic sensor so as to correct the initial output quantity of the piezomagnetic sensor to be zero.
14. The signal processing apparatus of claim 13, the calibration module being a subtraction circuit.
15. The signal processing apparatus of claim 11, the signal processing unit further comprising: and the precise rectification module is used for precisely rectifying the amplitude-modulated envelope signal and converting the amplitude-modulated envelope signal into a positive voltage signal.
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| CN201911378078.6A CN111060229A (en) | 2019-12-27 | 2019-12-27 | Signal processing method and device |
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