CN110320338B - Carrier signal excitation source and carrier signal synthesis method - Google Patents
Carrier signal excitation source and carrier signal synthesis method Download PDFInfo
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Abstract
The invention discloses a carrier signal excitation source and a carrier signal synthesis method, which comprise the following steps: the carrier signal generation module is used for carrying out frequency multiplication, operational amplification and direct-current voltage bias processing on the low-frequency signal, carrying out operational amplification processing on the high-frequency signal and synthesizing the processed low-frequency signal and the high-frequency signal into a carrier signal; and the envelope signal generating module is used for carrying out phase adjustment and phase inversion processing on the low-frequency signals to obtain two paths of follow-up envelope signals with the phase difference of 180 degrees. The signal output by the invention has higher stability and enough output power, and can meet the high-low frequency requirements of the fields of nondestructive testing and the like on the excitation source signal.
Description
Technical Field
The invention relates to the technical field of signal excitation sources, in particular to a carrier signal excitation source and a carrier signal synthesis method.
Background
Common nondestructive testing methods in the fields of safety testing of special equipment and defect testing of oil and gas pipelines include eddy current nondestructive testing, conventional ultrasonic testing, electromagnetic ultrasonic testing, magnetic flux leakage testing and the like. In many non-destructive testing methods, the signal excitation source is an extremely critical component. In the detection signals output by the signal excitation source at the present stage, most signal components are single, and defects cannot be effectively detected, or signals with various components exist, but the detection distance and the depth are not enough, and the penetrability is not strong. In the field of trenchless pipeline detection, the original detection signal excitation source has extremely weak reaction to defects. In addition, other types of multi-frequency detection means at the present stage have low penetrating power to the pipeline containing the coating layer, low defect identification performance and easy occurrence of missed detection, and only can output a single multi-frequency signal and cannot change the signal component of the multi-frequency signal.
Disclosure of Invention
Aiming at the defects existing in the problems, the invention provides a carrier signal excitation source and a carrier signal synthesis method.
The invention discloses a carrier signal excitation source, comprising:
the carrier signal generation module is used for carrying out frequency multiplication, operational amplification and direct-current voltage bias processing on the low-frequency signal, carrying out operational amplification processing on the high-frequency signal and synthesizing the processed low-frequency signal and the high-frequency signal into a carrier signal;
and the envelope signal generating module is used for carrying out phase adjustment and phase inversion processing on the low-frequency signals to obtain two paths of follow-up envelope signals with the phase difference of 180 degrees.
As a further improvement of the invention, the method also comprises the following steps:
the optical coupling isolation module is used for carrying out optical coupling isolation on one path of carrier signal and two paths of follow-up envelope signals;
and the power amplification module is used for carrying out power amplification on the one path of carrier signal and the two paths of follow-up envelope signals after optical coupling isolation.
As a further improvement of the present invention, the carrier signal generation module includes:
the low-frequency signal generating module is used for generating a low-frequency signal;
the frequency doubling module is used for carrying out frequency doubling on the low-frequency signal to generate a frequency-doubled low-frequency signal;
the low-frequency operational amplifier module is used for carrying out amplitude amplification on the frequency doubling low-frequency signal to generate an amplified low-frequency signal;
the direct current signal module is used for generating a direct current voltage signal;
the low-frequency component synthesis module is used for carrying out addition operation on the amplified low-frequency signal and the direct-current voltage signal to generate a low-frequency signal subjected to direct-current bias;
the high-frequency signal generating module is used for generating a high-frequency signal;
the high-frequency operational amplifier module is used for amplifying the amplitude of the high-frequency signal to generate an amplified high-frequency signal;
and the carrier signal synthesis module is used for multiplying the low-frequency signal subjected to the direct current bias and the amplified high-frequency signal to generate a carrier signal without envelope.
As a further improvement of the present invention, the low-frequency signal generated by the low-frequency signal generating module and the high-frequency signal generated by the high-frequency signal generating module have the same amplitude and different frequencies;
and the amplitude amplification factor of the low-frequency operational amplifier module is smaller than that of the high-frequency operational amplifier module.
As a further improvement of the present invention, the amplitude amplification factor of the low-frequency operational amplifier module is 0.75 times of the amplitude amplification factor of the high-frequency operational amplifier module;
and the frequency multiplication module is used for multiplying the frequency of the low-frequency signal by 2 times.
As a further improvement of the invention, the high-frequency signal generation module controls the generated high-frequency signal to be a sine wave or a pulse wave by giving high and low levels to the control pins A0 and A1 of the high-frequency signal output chip.
As a further improvement of the present invention, the calculation formula of the carrier signal synthesis module to generate the carrier signal without the envelope is:
UA(t)＝Um(1+ma cosΩt)cosWct
in the formula: u shapeA(t) is the output carrier signal, maTo amplitude modulation factor, uc(t)＝Um cosWct is a high frequency signal, uΩ(t)＝Um cosΩtcosWct-is the low frequency modulation signal.
As a further improvement of the present invention, the envelope signal generating module includes:
the low-frequency signal generating module is used for generating the low-frequency signal;
the signal phase adjusting module is used for adjusting the phase of the low-frequency signal, the generated phase-adjusted low-frequency signal is divided into two paths, and one path of the phase-adjusted low-frequency signal is used as one path of follow-up envelope signal;
and the signal phase inversion module is used for performing phase inversion on the other path of phase-adjusted low-frequency signal to generate the other path of follow-up envelope signal with the phase difference of 180 degrees.
The invention also discloses a carrier signal synthesis method of the carrier signal excitation source, which comprises the following steps:
generating a low frequency signal;
carrying out frequency doubling on the low-frequency signal to generate a frequency-doubled low-frequency signal;
amplifying the amplitude of the frequency doubling low-frequency signal to generate an amplified low-frequency signal;
generating a direct current voltage signal;
adding the amplified low-frequency signal and the direct-current voltage signal to generate a low-frequency signal subjected to direct-current bias;
generating a high-frequency signal, wherein the high-frequency signal and the low-frequency signal have the same amplitude and different frequencies;
amplifying the amplitude of the high-frequency signal to generate an amplified high-frequency signal, wherein the amplitude amplification factor of the low-frequency operational amplifier module is smaller than that of the high-frequency operational amplifier module;
multiplying the low-frequency signal subjected to the direct current bias and the amplified high-frequency signal to generate a path of carrier signal without envelope;
carrying out phase adjustment on the low-frequency signal, dividing the generated phase-adjusted low-frequency signal into two paths, and taking one path of the phase-adjusted low-frequency signal as one path of follow-up envelope signal;
and carrying out phase inversion on the other path of phase-adjusted low-frequency signal to generate the other path of follow-up envelope signal with the phase difference of 180 degrees.
As a further improvement of the invention, the method also comprises the following steps:
optically coupling and isolating one path of non-enveloped carrier signal and two paths of follow-up envelope signals;
and performing power amplification on the one path of non-enveloped carrier signals and the two paths of follow-up envelope signals after the optical coupling isolation, and realizing the signal output of the two paths of follow-up signals which are always enveloped carrier signals and have a correlation relation with each other.
Compared with the prior art, the invention has the beneficial effects that:
1. the carrier signal excitation source comprises two paths of envelope follow-up signals and a path of carrier signal. The two paths of envelope signals and the one path of carrier signal jointly form a detection excitation signal which is suitable for nondestructive detection of the steel pipeline and has stronger penetrating power and carrying capacity of defect signals;
2. the invention can complete the close combination of the three signals only by adjusting the frequency of the low-frequency component of the carrier signal, so that two paths of envelope signals are always enveloped on the carrier signal;
3. according to the invention, sine waves and pulse waves can be output by adjusting the high and low levels of the control pins A0 and A1 of the high-frequency signal generation chip, and sine carrier signals and pulse carrier signals can be synthesized respectively;
4. the carrier signal excitation source adopts a mode of isolating the signal generation module from the power amplification module, and utilizes an analog optical coupling isolation method to prevent the signal generation module from being damaged possibly due to overload and other conditions in the use process.
Drawings
FIG. 1 is a block diagram of a carrier signal excitation source according to one embodiment of the present invention;
FIG. 2 is a general circuit diagram of a carrier signal generation module according to an embodiment of the present invention;
FIG. 3 is a circuit diagram illustrating the switching between a sinusoidal carrier signal and a pulse carrier signal according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a DC signal module according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a carrier signal synthesizing module according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a signal phase adjustment module according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of an opto-isolator module according to one embodiment of the present disclosure;
fig. 8 is a circuit diagram of a power amplifier module according to an embodiment of the disclosure;
fig. 9 is a circuit diagram of a power supply regulator module according to an embodiment of the disclosure.
In the figure:
10. a carrier signal generation module; 11. a low frequency signal generation module; 12. a frequency doubling module; 13. a low-frequency operational amplifier module; 14. a direct current signal module; 15. a low frequency component synthesis module; 16. a high-frequency signal generating module; 17. a high-frequency operational amplifier module; 18. a carrier signal synthesis module; 20. an envelope signal generation module; 21. a signal phase inversion module; 22. a signal phase adjustment module; 30. an opto-coupler isolation module; 40. and a power amplification module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1, the present invention provides a carrier signal excitation source, comprising: the device comprises a carrier signal generating module 10, an envelope signal generating module 20, an optical coupling isolation module 30 and a power amplifying module 40; wherein:
the carrier signal generation module 10 of the present invention is used for frequency multiplication, operational amplification and dc voltage offset processing of low frequency signals, operational amplification processing of high frequency signals, and synthesis of a path of carrier signal from the processed low frequency signals and high frequency signals.
As shown in fig. 2, in order to implement the above functions, the carrier signal generation module 10 of the present invention specifically includes: the system comprises a low-frequency signal generation module 11, a frequency doubling module 12, a low-frequency operational amplifier module 13, a direct-current signal module 14, a low-frequency component synthesis module 15, a high-frequency signal generation module 16, a high-frequency operational amplifier module 17 and a carrier signal synthesis module 18; the low-frequency signal generation module 11 is connected with the frequency doubling module 12, the frequency doubling module 12 is connected with the low-frequency operational amplifier module 13, the low-frequency operational amplifier module 13 and the direct-current signal module 14 are connected with the low-frequency component synthesis module 15, the high-frequency signal generation module 16 is connected with the high-frequency operational amplifier module 17, and the low-frequency component synthesis module 15 and the high-frequency operational amplifier module 17 are connected with the carrier signal synthesis module 18; wherein:
the low-frequency signal generation module 11 of the present invention is used for generating a low-frequency signal, wherein the amplitude of the low-frequency signal is consistent with the amplitude of the high-frequency signal generation module 16, but the frequency is inconsistent; fig. 9 shows the design of the on-board power supply part of the signal generation, and the circuit of the power supply part is shown in the figure. The supply voltage source can be divided into 4 voltage domains, i.e., 32V, ± 15V, ± 5V, 3.3V, depending on the type of supply voltage required by the various electronic components in the circuit. The following 3 types are mainly used in the signal generation section, and this section mainly describes the signal generation section. The input voltage range of the signal generation module circuit board is +/-15V to +/-36V, and the voltage needs to be stabilized to +/-15V, +/-5V and 3.3V. As shown in fig. 3, the external power supply is connected to the three-way connection terminal, and enters the bridge rectifier circuit after passing through the six-pin switch. And then enters a +/-15V voltage stabilizing circuit consisting of a chip IC1 and an IC 2. After the voltage of +/-15V is generated through voltage stabilization, the voltage of +/-5V is stabilized by a circuit composed of the chip IC3 and the IC4 except for a circuit required by the relevant power supply voltage. The specific connection mode is that the left side of the filter circuit composed of diodes D1, D2, D3 and D4 is connected with input voltage, the output end is connected with the input ends of IC1 and IC2, and two pairs of polar capacitors and one pair of non-polar capacitors are connected with the voltage stabilizing chip in parallel. The output terminals of the IC1 and the IC2 are connected to the input terminals of the IC3 and the IC4, respectively, and the IC3 and the IC4 are connected in parallel to two pairs of non-polar capacitors and one pair of polar capacitors. The output terminals of the IC3 and IC4 chips output voltages of-5V and +5V, respectively. Similarly, plus and minus 5V voltage is regulated to 3.3V by a voltage regulator circuit consisting of voltage regulator component D1, in addition to being supplied to the circuits with the associated voltage requirements.
The frequency doubling module 12 of the present invention is used for frequency doubling the low-frequency signal generated by the low-frequency signal generating module 11 to generate a frequency-doubled low-frequency signal; the frequency amplification factor of the frequency doubling module 12 for the low-frequency signal is 2 times;
the low-frequency operational amplifier module 13 is used for amplifying the amplitude of the frequency doubling low-frequency signal of the frequency doubling module 12 to generate an amplified low-frequency signal; in order to generate a modulated carrier signal, the amplitude of the low-frequency carrier component and the amplitude of the high-frequency carrier component of the signal need to have a certain proportional relationship, so that the generated carrier signal is ensured to have a good modulated waveform. The amplitudes of the original low-frequency signal and the original high-frequency wave signal are consistent, the amplification coefficient of the original low-frequency signal is inconsistent with that of the original high-frequency signal, and the amplification factor of the frequency doubling module 12 of the invention is required to be smaller than that of the high-frequency operational amplifier module; preferably, the amplitude amplification factor of the low-frequency operational amplifier module is 0.75 times of the amplitude amplification factor of the high-frequency operational amplifier module;
the direct current signal module 14 of the present invention is used for generating a direct current voltage signal; as shown in fig. 4, the dc signal module 14 of the present invention realizes 5V voltage input and 3.3V voltage output, the +5V input is connected to the resistor R1, the resistor R1 is connected to the K terminal of D1 and is connected to the resistor R2; the R ends of the D1 are connected to resistors R2 and R3 respectively, and the two resistors are also connected in series. The terminal A of the D1 and the terminal R of the resistor are grounded.
The low-frequency component synthesis module 15 of the present invention is configured to perform addition operation on the amplified low-frequency signal and the dc voltage signal to generate a dc-biased low-frequency signal;
a high frequency signal generating module 16 of the present invention for generating a high frequency signal; as shown in fig. 3, the present invention can control the high frequency signal output chip IC14 to output sine wave or pulse wave by giving high and low levels to the control pins a0 and a1 of the high frequency signal output chip IC 14;
the high-frequency operational amplifier module 17 is used for amplifying the amplitude of a high-frequency signal to generate an amplified high-frequency signal;
the carrier signal synthesis module 18 of the present invention is configured to perform multiplication operation on the low-frequency signal after dc offset and the amplified high-frequency signal to generate a carrier signal without envelope; wherein, the calculation formula for generating the carrier signal without the envelope is as follows:
UA(t)＝Um(1+ma cosΩt)cosWct
in the formula: u shapeA(t) is the output carrier signal, maTo amplitude modulation factor, uc(t)＝Um cosWct is a high frequency signal, when cosWcWhen t is a constant, the high-frequency signal is a square wave signal; u. ofΩ(t)＝Um cosΩtcosWct is the low frequency modulation signal.
By adjusting the output mode of the high-frequency signal generation module, the output waveform form of the high-frequency signal is converted, and a sine carrier signal and a pulse carrier signal can be output. When the high-frequency signal is a sine signal, the output is a sine carrier signal. When the high-frequency signal is a pulse square wave signal, the output is a pulse carrier signal.
As shown in fig. 5, the IC5 in the carrier signal synthesizing module 18 of the present invention is a modulation master control chip, and a mixed signal of low frequency and direct current signals is connected to the low frequency input end of the chip. High-frequency signals are input to a high-frequency input end, and a power supply adopts a +/-5V power supply mode. In order to ensure that the modulated carrier signal has smaller burrs and a more stable signal shape, a filter capacitor is added to the power supply. The power supply is respectively connected with two nonpolar capacitors and a polar capacitor in parallel to carry out power supply filtering. The output part connects the addition input end of the IC5 chip to the resistor R4, the other end of R4 is grounded, meanwhile, the part is connected to the output end through the resistor R3 and the capacitor C7, and the output end is connected to one end of the capacitor C8. The other end of the capacitor C8 outputs the combined carrier signal.
Further, for the low-frequency and high-frequency signal generating module, a single-path sinusoidal signal needs to be provided. The stability of the sinusoidal signal directly affects the signal quality of the synthesized carrier signal. Meanwhile, in order to enhance the signal penetration, it is required that the frequency of the low-frequency component of the output carrier signal is sufficiently low. In addition, in order to improve the universality of signal generation and meet the diversity requirements of the nondestructive testing field on detection signals under different working conditions and different detection objects, the sinusoidal signal generation module is required to not only output a sinusoidal signal as a source signal of a carrier signal, but also output various signals such as a square wave signal and a triangular wave signal. In the using process, the duty ratio of the signal also needs to be adjusted, so that the signal generating module is required to have the duty ratio adjusting function. Since the stability of the source signal output by the signal generation module has a great influence on the quality of the carrier signal, a high requirement is also made on the stability of the output signal of the signal generation module.
The envelope signal generating module 20 of the present invention is used for obtaining two paths of follow-up envelope signals with a phase difference of 180 degrees after the low-frequency signals are subjected to phase adjustment and phase inversion.
In order to implement the above functions, the envelope signal generating module 20 of the present invention specifically includes a low-frequency signal generating module 11, a signal phase inverting module 21, and a signal phase adjusting module 22; the low-frequency signal generation module 11 is connected with the signal phase inversion module 21, and the signal phase inversion module 21 is connected with the signal phase adjustment module 22; wherein:
the low-frequency signal generating module 11 of the present invention is used for generating a low-frequency signal;
the signal phase adjusting module 21 of the present invention is configured to perform phase adjustment on a low-frequency signal, where the generated phase-adjusted low-frequency signal is divided into two paths, and one path of the phase-adjusted low-frequency signal is used as one path of the follow-up envelope signal;
the signal phase inversion module 22 of the present invention is configured to perform phase inversion on the other path of phase-adjusted low-frequency signal to generate another path of follow-up envelope signal with a phase difference of 180 °;
as shown in fig. 6, the original low-frequency signal in the envelope signal generating module 20 of the present invention is coupled to the inverting input terminal of the operational amplifier IC6 through the resistor R1, and is coupled to the non-inverting input terminal of the operational amplifier IC6 through the potentiometer R2. And a non-polar capacitor C1 is connected in parallel between the R2 and the non-polar input end of the operational amplifier. The output end of the operational amplifier is divided into two paths, one path is connected into the isolation module for output, and the other path is connected into an inverter circuit formed by the operational amplifier; the operational amplifier adopts a +/-5V double power supply to supply power, a feedback resistor R3 is added at the same time, and an output part outputs a phase-shifted signal through a resistor R4; wherein, the frequency of the low-frequency component of the enveloped carrier signal is twice the frequency of the two envelope signals. The signal generating sources are the same. When the frequency of the carrier signal changes, the frequency of the two paths of envelope signals also changes, and the tracks of the two paths of envelope signals always follow the envelope carrier signal, so that the output of the two paths of envelope signals is realized.
The optical coupling isolation module 30 of the present invention is used for performing optical coupling isolation on one path of carrier signal and two paths of follow-up envelope signals; the optical coupling isolation module 30 of the present invention is three independent modules, which are respectively connected to the output ends of the carrier signal synthesis module 18, the signal phase adjustment module 21, and the signal phase inversion module 22. As shown in fig. 7, the adopted linear optical coupling isolation chip is a safety isolation main control chip, the IC13 is used as the input terminal of the operation amplifier IC11, and the output terminal of the IC11 is connected to the input terminal of the optical coupling isolation chip through the resistor R1. One end of the capacitor C1 is connected with the pin 4 of the light-isolating chip, and the other end is connected with the output end of the IC11, so as to form negative feedback. Pin 8 of the light-isolation chip IC13 is an analog output terminal and is connected to the non-inverting input terminal of the operational amplifier IC 12. One end of the resistor R2 is connected to the non-inverting input terminal, and the other end is grounded. The light isolation chip is powered by a +5V single power supply. The output terminal of the IC12 chip is directly connected to the input terminal of the power amplifier.
The power amplification module 40 of the invention is used for performing power amplification on one path of carrier signals and two paths of follow-up envelope signals after optical coupling isolation; the power amplification module 40 of the present invention is three independent modules, which are correspondingly connected to the optical coupling isolation module 30; as shown in fig. 8, a power amplification module is an important part of the function of the signal excitation source. As shown in fig. 8, the input signal is connected to one end of the resistor R1, the other end of the R1 is connected to the fixed end of the sliding rheostat R2, and the sliding end of the sliding rheostat R2 is connected to one end of the fixed resistor R3. The other end of R2 is grounded. The other end of R3 is connected with the fixed end of the slide rheostat R4. The sliding end of R4 is connected with a fixed value resistor R6, and two nonpolar capacitors are connected into the R6 in parallel with the sliding end of R4. The other ends of the nonpolar capacitors are respectively connected to two fixed ends of the R4. R6 is connected to the slide end of the slide rheostat R8. Two fixed ends of the R8 are respectively connected to two nonpolar constant volume C3 and C4, and a sliding end of the R8 is connected with the constant value resistor R7 and one end of the R6. R7 is connected to the positive end of the polar capacitor C5, and the negative end of the R5 polar capacitor is connected to one end of the constant resistor R9. The other end of the R9 is connected to the positive input end of the power amplification chip IC 7. The power amplification chip adopts a double-power supply +/-36V power supply mode. The output section is passively filtered using resistor R13 and capacitor C7.
After the carrier signal and the two paths of envelope signals are output, the carrier signal and the two paths of envelope signals need to be accessed into the power amplification module through the optical coupling isolation module. Because the output signal limited at the beginning of the design is a sine signal, the optical coupling isolation should be linear alternating current optical coupling isolation.
The invention provides a carrier signal synthesis method, which comprises the following steps:
generating a low frequency signal;
carrying out frequency doubling on the low-frequency signal to generate a frequency-doubled low-frequency signal;
amplifying the amplitude of the frequency doubling low-frequency signal to generate an amplified low-frequency signal;
generating a direct current voltage signal;
adding the amplified low-frequency signal and the direct-current voltage signal to generate a low-frequency signal subjected to direct-current bias;
generating a high-frequency signal, wherein the amplitude of the high-frequency signal is the same as that of the low-frequency signal, and the frequency of the high-frequency signal is different from that of the low-frequency signal;
amplifying the amplitude of the high-frequency signal to generate an amplified high-frequency signal, wherein the amplitude amplification factor of the low-frequency operational amplifier module is smaller than that of the high-frequency operational amplifier module;
multiplying the low-frequency signal subjected to the direct current bias and the amplified high-frequency signal to generate a path of carrier signal without envelope;
carrying out phase adjustment on the low-frequency signal, dividing the generated phase-adjusted low-frequency signal into two paths, and taking one path of the phase-adjusted low-frequency signal as one path of follow-up envelope signal;
and performing phase inversion on the other path of phase-adjusted low-frequency signal to generate another path of follow-up envelope signal with the phase difference of 180 degrees.
Optically coupling and isolating one path of non-enveloped carrier signal and two paths of follow-up envelope signals;
and performing power amplification on the one path of non-enveloped carrier signals and the two paths of follow-up envelope signals after the optical coupling isolation, and realizing the signal output of the two paths of follow-up signals which are always enveloped carrier signals and have a correlation relation with each other.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A carrier signal excitation source, comprising:
the carrier signal generation module is used for carrying out frequency multiplication, operational amplification and direct-current voltage bias processing on the low-frequency signal, carrying out operational amplification processing on the high-frequency signal and synthesizing the processed low-frequency signal and the high-frequency signal into a carrier signal;
the envelope signal generation module is used for carrying out phase adjustment on the low-frequency signal, the generated phase adjustment low-frequency signal is divided into two paths, and one path of the phase adjustment low-frequency signal is used as one path of follow-up envelope signal; and carrying out phase inversion on the other path of phase-adjusted low-frequency signal to generate the other path of follow-up envelope signal with the phase difference of 180 degrees.
2. The carrier signal stimulus of claim 1, further comprising:
the optical coupling isolation module is used for carrying out optical coupling isolation on one path of carrier signal and two paths of follow-up envelope signals;
and the power amplification module is used for carrying out power amplification on the one path of carrier signal and the two paths of follow-up envelope signals after optical coupling isolation.
3. The carrier signal stimulus of claim 1, wherein the carrier signal generation module comprises:
the low-frequency signal generating module is used for generating a low-frequency signal;
the frequency doubling module is used for carrying out frequency doubling on the low-frequency signal to generate a frequency-doubled low-frequency signal;
the low-frequency operational amplifier module is used for carrying out amplitude amplification on the frequency doubling low-frequency signal to generate an amplified low-frequency signal;
the direct current signal module is used for generating a direct current voltage signal;
the low-frequency component synthesis module is used for carrying out addition operation on the amplified low-frequency signal and the direct-current voltage signal to generate a low-frequency signal subjected to direct-current bias;
the high-frequency signal generating module is used for generating a high-frequency signal;
the high-frequency operational amplifier module is used for amplifying the amplitude of the high-frequency signal to generate an amplified high-frequency signal;
and the carrier signal synthesis module is used for multiplying the low-frequency signal subjected to the direct current bias and the amplified high-frequency signal to generate a carrier signal without envelope.
4. The carrier signal excitation source of claim 3 wherein said low frequency signal generated by said low frequency signal generation module is the same amplitude and different frequency from said high frequency signal generated by said high frequency signal generation module;
and the amplitude amplification factor of the low-frequency operational amplifier module is smaller than that of the high-frequency operational amplifier module.
5. The carrier signal excitation source according to claim 4, wherein the amplitude amplification of the low frequency operational amplifier module is 0.75 times the amplitude amplification of the high frequency operational amplifier module;
and the frequency multiplication module is used for multiplying the frequency of the low-frequency signal by 2 times.
6. The carrier signal stimulus source of claim 3, wherein the high frequency signal generation module controls the generated high frequency signal to be a sine wave or a pulse wave by giving high and low levels to control pins A0 and A1 of the high frequency signal output chip.
7. A carrier signal driver according to claim 3 wherein the carrier signal synthesis module generates a carrier signal without an envelope by the formula:
in the formula:
in order to output the carrier wave signal,
in order to be the amplitude-modulated coefficients,
in order to be a high-frequency signal,
is a low frequency modulated signal.
8. A carrier signal stimulus source as claimed in claim 3, wherein the envelope signal generation module comprises:
the low-frequency signal generating module is used for generating the low-frequency signal;
the signal phase adjusting module is used for adjusting the phase of the low-frequency signal, the generated phase-adjusted low-frequency signal is divided into two paths, and one path of the phase-adjusted low-frequency signal is used as one path of follow-up envelope signal;
and the signal phase inversion module is used for performing phase inversion on the other path of phase-adjusted low-frequency signal to generate the other path of follow-up envelope signal with the phase difference of 180 degrees.
9. A carrier signal synthesis method based on a carrier signal excitation source according to any one of claims 1 to 8, comprising:
generating a low frequency signal;
carrying out frequency doubling on the low-frequency signal to generate a frequency-doubled low-frequency signal;
amplifying the amplitude of the frequency doubling low-frequency signal to generate an amplified low-frequency signal;
generating a direct current voltage signal;
adding the amplified low-frequency signal and the direct-current voltage signal to generate a low-frequency signal subjected to direct-current bias;
generating a high-frequency signal, wherein the high-frequency signal and the low-frequency signal have the same amplitude and different frequencies;
amplifying the amplitude of the high-frequency signal to generate an amplified high-frequency signal, wherein the amplitude amplification factor of the low-frequency operational amplifier module is smaller than that of the high-frequency operational amplifier module;
multiplying the low-frequency signal subjected to the direct current bias and the amplified high-frequency signal to generate a path of carrier signal without envelope;
carrying out phase adjustment on the low-frequency signal, dividing the generated phase-adjusted low-frequency signal into two paths, and taking one path of the phase-adjusted low-frequency signal as one path of follow-up envelope signal;
and carrying out phase inversion on the other path of phase-adjusted low-frequency signal to generate the other path of follow-up envelope signal with the phase difference of 180 degrees.
10. The carrier signal synthesizing method according to claim 9, further comprising:
optically coupling and isolating one path of non-enveloped carrier signal and two paths of follow-up envelope signals;
and performing power amplification on the one path of non-enveloped carrier signals and the two paths of follow-up envelope signals after the optical coupling isolation, and realizing the signal output of the two paths of follow-up signals which are always enveloped carrier signals and have a correlation relation with each other.
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