CN110261492B - Method and device for driving ultrasonic sensor by digital sequence - Google Patents

Method and device for driving ultrasonic sensor by digital sequence Download PDF

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CN110261492B
CN110261492B CN201910398391.XA CN201910398391A CN110261492B CN 110261492 B CN110261492 B CN 110261492B CN 201910398391 A CN201910398391 A CN 201910398391A CN 110261492 B CN110261492 B CN 110261492B
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宋寿鹏
邱越
乔梦丽
陈昊
成芮萱
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Jiangsu University
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Abstract

The invention discloses a method and a device for driving an ultrasonic sensor by a digital sequence, wherein the method comprises the following steps: s1, generating logic level as digital sequence a (k) by a control module which is formed by taking FPGA or ARM digital chips as cores; s2, generating high-energy excitation signal x by using ultrasonic excitation module composed of ultrasonic excitation chip as coren(t); s3, exciting the ultrasonic sensor by the high-energy exciting signal to generate an ultrasonic signal y with controllable exciting signaln(t) of (d). The device for realizing the method comprises a control module, an ultrasonic excitation module and an ultrasonic sensor module. The ultrasonic excitation signal parameters in the invention are adjustable, and the invention is particularly suitable for occasions requiring different waveforms to excite a single or a plurality of ultrasonic sensors.

Description

Method and device for driving ultrasonic sensor by digital sequence
Technical Field
The invention belongs to the technical field of ultrasonic detection, and relates to a method and a device for driving an ultrasonic sensor by a digital sequence. The ultrasonic excitation signal parameters in the invention are adjustable, and the invention is particularly suitable for occasions requiring different waveforms to excite the ultrasonic sensor.
Background
Ultrasonic detection is an important nondestructive detection means, and is widely developed and applied at home and abroad. In recent years, integrated circuits based on electronic science and technology have been rapidly developed, and ultrasonic detection systems are being developed toward digitization, integration, functionalization and portability on the basis of the integrated circuits. The existing ultrasonic signal excitation forms can be divided into a pulse excitation form and a coding excitation form, the pulse excitation generation mode is simple and easy to adjust, but the amplitude of the excitation pulse determines the peak acoustic power of the initial wave, and the emission energy cannot be increased without limit, so that the peak acoustic power is close to the safety limit of an ultrasonic transducer or a measured object, and the average acoustic power is still low. The average acoustic power is determined by the pulse width, and increasing the average acoustic power requires increasing the pulse width, which results in a decrease in range resolution. Therefore, the traditional single-pulse excitation has certain contradiction between the improvement of the acoustic power and the improvement of the resolution. The encoding excitation mode uses a group of continuous encoding sequences to replace a single pulse excitation broadband ultrasonic transducer, the excitation duration is longer than the pulse width of a single pulse, the average acoustic power is improved, and a decoding pulse which is close to the single pulse width but has a larger amplitude value can be obtained after pulse compression, so that the signal-to-noise ratio is improved. Meanwhile, for the ultrasonic detection equipment in the form of a sensor array, the coded excitation can also be used for carrying out information source identification on each ultrasonic transducer, so that various sound field parameters (Songheng, Liuming Yu, and the research on the binary coding-based pipeline defect ultrasonic detection method [ J ]. piezoelectricity and acoustooptic, 2018(6)) can be solved.
Most of ultrasonic sensor excitation modes in the current market excite detection ultrasonic waves with specific frequency and specific power through an analog circuit or a main control chip, and the ultrasonic sensor excitation mode has the defects of single function, small adjustable range, inflexible use and the like, and is inconvenient for multifunctional ultrasonic excitation in complex occasions.
Disclosure of Invention
In view of the above-mentioned disadvantages of the ultrasonic excitation technology, the present invention provides a method and apparatus for driving ultrasonic transducers in digital sequence, which generates single-path or multi-path ultrasonic excitation signals for exciting a single transducer or a transducer array, and each path of ultrasonic transducer can be excited by using multiple pulses or encoded forms according to the excitation requirement. The invention is especially suitable for occasions requiring different waveforms to excite the ultrasonic sensor, and the parameters of the ultrasonic excitation signal are adjustable. The technical scheme for realizing the invention is as follows:
s1, generating logic level as digital sequence control signal a (k) by control module composed of FPGA or ARM as core;
s2, generating high-energy excitation signal x by using ultrasonic excitation module composed of ultrasonic excitation chip as coren(t)；
S3, exciting the ultrasonic sensor by the high-energy exciting signal to generate an ultrasonic signal y with controllable exciting signaln(t)。
In the present invention, step S1 specifically includes:
the control module generates logic level with high level being +3.3V and low level being 0V as digital sequence control signal alpha (k) through software programming, and the expression of single-path digital sequence alpha (k) output by the control module is as follows:
Figure BDA0002058918540000021
where K is the total length of the sequence, the step size of K being determined by the clock signal of the control module, bkA is the logic value of 0 or 1 given by the control module, and A is the logic level magnitude. Logical order of the digit sequence bkChanges may be made by programming.
The step S2 specifically includes:
the number of the digital sequences output by the control module and the number of the ultrasonic excitation chips are determined by the number of the ultrasonic sensors required to be excited, and the length of the digital sequences is determined by the type of the ultrasonic signals required to be excited;
the power supply form of the ultrasonic excitation module is bipolar direct-current voltage power supply, the power supply adopts an AC-DC mode, 220V alternating current can be converted into a direct-current adjustable voltage source, and the voltage value of the direct-current voltage source is the amplitude of the high-energy excitation signal.
The step S2 further includes:
the ultrasonic excitation chip is controlled by the control module through logic level, every 2 control pins control 1 path of ultrasonic excitation signal, and 1 path of high-energy excitation signal x1(t) 2-way digital sequence alpha corresponding thereto1(k) And alpha2(k) Performing combination control, regarding the digital sequence as a rising edge of the high-energy excitation signal when the digital sequence jumps from 0 to 1, regarding the digital sequence as a falling edge of the high-energy excitation signal when the digital sequence jumps from 1 to 0, and keeping the output of the high-energy excitation signal when the digital sequence is 1 and does not jump, thereby forming a control relation x between the digital sequence and the high-energy excitation signal1(t)＝α1(k)EG(t-k1τ1)-α2(k)EG(t-k2τ2) Wherein G (t-k τ) is a window function of length τ and
Figure BDA0002058918540000022
the time constant tau is the holding time of the high level of the digital sequence; e is the DC voltage amplitude value provided by the power module to the ultrasonic excitation module; the high-energy excitation signals are independent to each other and can simultaneously generate different high-energy excitation signals x1(t) to xn(t), namely:
Figure BDA0002058918540000023
where K is the total length of the excitation signal, G (t-K)2n-1τ2n-1) Is of length τ2n-1Window function of, G (t-k)2nτ2n) Is of length τ2nA window function of, and
Figure BDA0002058918540000024
Figure BDA0002058918540000025
and
Figure BDA0002058918540000026
logic values of 0 or 1 are given by the control module;
Figure BDA0002058918540000031
is a fundamental frequency of ω2n-1The square wave signal Fourier trigonometric function expansion of (1),
Figure BDA0002058918540000032
is a fundamental frequency of ω2nSquare wave signal fourier trigonometric function expansion, ω2n-1And omega2nI.e. from alpha2n-1(k)G(t-k2n-1τ2n-1) And alpha2n(k)EG(t-k2nτ2n) Controlling; e is the DC voltage amplitude value provided by the power module to the ultrasonic excitation module; n is an element of Z+The number of sensors required to be excited.
The step S2 further includes:
the control of the form of the ultrasonic excitation signal is realized by programming a control module, such as generating a single positive-going pulse, a single positive-negative bidirectional pulse, a plurality of pulse combinations, a phase modulation coding form, a frequency modulation coding form and the like; wherein, parameters such as center frequency, phase, pulse width, pulse number, code element frequency, code element combination, coding duration, repetition frequency, etc. of the excitation signal can be changed by the control module
Figure BDA0002058918540000033
And
Figure BDA0002058918540000034
logic level duration G (t-k)2n-1τ2n-1) And G (t-k)2nτ2n) To adjust.
In the present invention, step S3 specifically includes:
high energy excitation signal xn(t) exciting the ultrasonic sensor hn(t) generating an ultrasonic signal yn(t)。
The device for driving the ultrasonic sensor by the digital sequence comprises a control module, an ultrasonic excitation module and an ultrasonic sensor module; the control module is respectively connected with the power supply and the ultrasonic excitation module, and the ultrasonic excitation module is connected with the ultrasonic sensor module; the control module is used for generating logic level as a digital sequence; the ultrasonic excitation module is used for generating a high-energy excitation signal, and the high-energy excitation signal excites the ultrasonic sensor to generate an ultrasonic signal with controllable excitation signal.
The invention has the following beneficial effects: the ultrasonic transducer is driven by a digital sequence, which is different from the existing excitation modes such as capacitance charging and discharging, excitation signal generation by D/A conversion or excitation signal generation by DDS technology. The invention has the advantage that the digital sequence a is generated by programming the control module1(k) To a2n(k) The ultrasonic excitation signal control device has the advantages that the number of channels and the excitation form of the ultrasonic excitation signals can be accurately controlled, the operation is convenient, the adjustment speed is high, the types of the generated ultrasonic excitation signals are rich, and the excitation effect is good. The control module only needs 3.3V direct current power supply, the direct current power supply voltage value received by the ultrasonic excitation module is the excitation signal amplitude, the power supply mode is simple, and the ultrasonic excitation signal amplitude is easy to adjust. Selection of ultrasonic transducer hn(t) and adjusting the corresponding high-energy excitation signal xn(t) generating the required ultrasonic signal ynAnd (t), the ultrasonic sensor is flexible to use, is suitable for occasions needing different waveform excitation ultrasonic sensors, has controllable ultrasonic excitation signal parameters, and can generate ultrasonic signals in various forms according to the actual detection requirements.
Drawings
FIG. 1 is a flow chart of the method of the present invention
FIG. 2 is a general schematic block diagram of an arbitrary digital sequence excitation device of an ultrasonic sensor according to an embodiment of the present invention
FIG. 3 is a block diagram of a control module in an embodiment of the invention
FIG. 4 is a circuit diagram of a control module according to an embodiment of the present invention
FIG. 5 is a schematic block diagram of an ultrasonic excitation module in an embodiment of the invention
FIG. 6 is a circuit diagram of an ultrasonic excitation module according to an embodiment of the present invention
FIG. 7 is a diagram illustrating the effect of binary-coded 000 stimulus implementation according to an embodiment of the present invention, wherein (a) shows the digital sequence α outputted from the I/O pin of the digital chip in the control module2n-1(k)-α2n(k) (ii) a (b) The figure shows the high-energy excitation signal x output by the ultrasonic excitation modulen(t); (c) the figure shows the obtained measured ultrasonic signal yn(t)
FIG. 8 is a diagram illustrating the effect of binary 101 excitation according to an embodiment of the present invention, wherein (a) shows the digital sequence α outputted from the I/O pin of the digital chip in the control module2n-1(k)-α2n(k) (ii) a (b) The figure shows the high-energy excitation signal x output by the ultrasonic excitation modulen(t); (c) the figure shows the obtained measured ultrasonic signal yn(t)；
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples. It should be noted that the present invention can also be applied by other equivalent embodiments, and the embodiments and the description of the drawings provided in the following examples are only used for illustrating the basic technical idea of the present invention, and the parameters of the relevant elements in the examples, such as the type, number, shape, size, etc., can be changed in the specific implementation environment.
Fig. 2 is a general schematic block diagram of an arbitrary digital sequence excitation device of an ultrasonic sensor in the embodiment of the invention. The excitation device forms a control module by using an FPGA minimum system, and a control signal is a logic level of high level +3.3V and low level 0V; the HV7351 ultrasonic excitation chip and the peripheral circuit thereof form an ultrasonic excitation module, and can generate multi-channel and multi-variety ultrasonic excitation signals simultaneously. The power supply adopts an AC-DC working mode and supplies power for the control module and the ultrasonic excitation module.
Fig. 3 is a schematic block diagram of a control module in an embodiment of the present invention, and fig. 4 is a circuit diagram of the control module in the embodiment of the present invention. The power supply provides +3.3V direct current voltage to supply power for the FPGA minimum system, the +3.3V power supply voltage is connected to the active crystal oscillator through a 0.1uF capacitor CX1 to enable the active crystal oscillator to generate a clock signal, the clock frequency is 50MHz, the clock signal is output through an active crystal oscillator No. 3 pin and is connected to a clock signal pin of the FPGA to provide the clock signal for the FPGA, and the shortest period of the FPGA output signal is 20 ns. The +3.3V direct-current voltage is simultaneously connected to a power supply pin of the FPGA, a grounding pin of the FPGA is simultaneously connected to a digital ground, and the digital ground is connected with a power supply ground through a 0 ohm resistor. FThe PGA program is compiled and debugged by development software to generate a ". jic" file, the FPGA program is downloaded to the SPI FLASH to be solidified in a JTAG mode, and the solidified program in the SPI FLASH is read by the pins of the programs from No. 33 to No. 36 of the FPGA to control the operation of the module. The rest I/O pins of the FPGA can output logic levels with the high voltage of +3.3V and the low voltage of 0V, and output a digital sequence a1(k) To a2n(k) The ultrasonic excitation module is controlled in a logic level mode, and the output single-path digital sequence alpha (k) of the control module is in a form of:
Figure BDA0002058918540000041
where K is the total length of the sequence, bkA is the logic value of 0 or 1 given by the control module, and A is the logic level magnitude.
Fig. 5 is a functional block diagram of an ultrasonic excitation module in an embodiment of the invention. The ultrasonic excitation module takes an HV7351 ultrasonic chip as a core, each HV7351 chip comprises 16 control pins, and the control pins are controlled by logic levels; each HV7351 can output 8 high-energy excitation digital sequences of different types at the same time, that is, every 2 control pins control 1 high-energy excitation signal and 1 high-energy excitation signal x1(t) 2-way digital sequence alpha corresponding thereto1(k) And alpha2(k) Performing combination control, regarding the digital sequence as a rising edge of the high-energy excitation signal when the digital sequence jumps from 0 to 1, regarding the digital sequence as a falling edge of the high-energy excitation signal when the digital sequence jumps from 1 to 0, and keeping the output of the high-energy excitation signal when the digital sequence is 1 and does not jump, thereby forming a control relation x between the digital sequence and the high-energy excitation signal1(t)＝α1(k)EG(t-k1τ1)-α2(k)EG(t-k2τ2) Wherein G (t-k τ) is a window function of length τ and
Figure BDA0002058918540000051
the time constant tau is the holding time of the high level of the digital sequence; e is the DC voltage amplitude value provided by the power module to the ultrasonic excitation module; each high energy excitation signal is mutuallyIndependently and respectively generating different high-energy excitation signals x at the same time1(t) to xn(t), namely:
Figure BDA0002058918540000052
where K is the total length of the excitation signal, G (t-K)2n-1τ2n-1) Is of length τ2n-1Window function of, G (t-k)2nτ2n) Is of length τ2nA window function of, and
Figure BDA0002058918540000053
Figure BDA0002058918540000054
and
Figure BDA0002058918540000055
logic values of 0 or 1 are given by the control module;
Figure BDA0002058918540000056
is a fundamental frequency of ω2n-1The square wave signal Fourier trigonometric function expansion of (1),
Figure BDA0002058918540000057
is a fundamental frequency of ω2nSquare wave signal fourier trigonometric function expansion, ω2n-1And omega2nI.e. from alpha2n-1(k)G(t-k2n-1τ2n-1) And alpha2n(k)EG(t-k2nτ2n) Controlling; e is the DC voltage amplitude value provided by the power module to the ultrasonic excitation module; n is an element of Z+The number of the required excitation sensors is; the number of the ultrasonic chips in the ultrasonic excitation module is determined by the number of the ultrasonic sensors required to be excited.
Fig. 6 is a circuit diagram of an ultrasonic excitation module in an embodiment of the invention. IN 1-IN 16 are 16 control pins of the ultrasonic chip, and the control pins are given by a digital sequence a of I/O pins of the control module1(k) To a2n(k) And (5) controlling. Ultrasonic chip output pinOUT 1-OUT 8 output high-energy excitation number sequence x1(k) To xn(k) The output pin is connected with the ultrasonic sensor by a 16-pin wiring terminal and can excite the selected ultrasonic sensor hn(t) generating ultrasonic waves. The ultrasonic excitation module receives power supply of a bipolar direct-current voltage source, a positive value of direct-current voltage is connected to a VPP pin, a negative value of the direct-current voltage is connected to a VNN pin, the highest value of the direct-current voltage acceptable by the ultrasonic excitation chip HV7351 is +/-70V, the direct-current voltage power supply value E is the amplitude of an ultrasonic excitation signal, the amplitude of the ultrasonic excitation signal can be controlled by adjusting the direct-current voltage power supply value E, and the maximum output current of the ultrasonic excitation signal is +/-3A. Meanwhile, the capacitors CPF, CNF, CPOS and CNEG are connected to play a role in decoupling and removing ripples for the chip. In the peripheral circuit, the current limiting resistors of the enable pins OEN and REN play a role in protecting the chip, and the power capacitors CH1 to CH4 play a role in preventing power supply impulse. If the ultrasonic excitation signal is required to be in a pulse excitation form, the excitation starting time of the pulse excitation can be adjusted by adjusting the logic time sequence of the control pin, and the control is used for controlling
Figure BDA0002058918540000061
And
Figure BDA0002058918540000062
the value of (a) is used for controlling the pulse excitation of the path to be a unidirectional pulse, a positive and negative bidirectional pulse or a plurality of pulse combinations; by adjusting the logic level duration G (t-k) of the control pin2n-1τ2n-1) And G (t-k)2nτ2n) The pulse width of the pulse excitation of the circuit can be adjusted. If the ultrasonic excitation signal needs to be in a coding excitation form, the control module needs to be programmed by combining the coding form, and the logic time sequence of the control pin is controlled
Figure BDA0002058918540000063
And
Figure BDA0002058918540000064
logic level duration G (t-k)2n-1τ2n-1) And G (t-k)2nτ2n) Performing combined control to generate a plurality of kindsA phase modulation coding or frequency modulation coding form; for example, for logic timing
Figure BDA0002058918540000065
And
Figure BDA0002058918540000066
the phase control of the coded excitation is adjusted for the duration G (t-k) of the logic level2n-1τ2n-1) And G (t-k)2nτ2n) The adjustment can control the symbol frequency and the code length.
In the embodiment of the present invention, the selected time domain response model h (t) of the ultrasonic transducer is set as:
Figure BDA0002058918540000067
wherein, beta is an amplitude coefficient,
Figure BDA0002058918540000068
gamma is the pulse width coefficient, omega0For the center frequency of the ultrasonic sensor,
Figure BDA0002058918540000069
phi is the initial phase. Its frequency domain response model H (ω) is then:
Figure BDA00020589185400000610
time domain expression x of the high-energy excitation signaln(t) is:
Figure BDA00020589185400000611
its frequency domain expression Xn(omega) is
Figure BDA00020589185400000612
Then can be according to yn(t)＝xn(t)*hn(t) and Yn(ω)＝Xn(ω)·Hn(omega) obtaining time domain and frequency domain expression of ultrasonic signal
Figure BDA00020589185400000613
Figure BDA00020589185400000614
Figure BDA0002058918540000071
I.e. the nth high-energy excitation signal xn(t) and the ultrasonic sensor hn(t) obtaining the ultrasonic signal ynAnd (t) realizing various forms of ultrasonic signal excitation.
Fig. 7 and 8 are diagrams illustrating the implementation of the embodiment of the present invention, fig. 7 illustrates the implementation of the binary encoding stimulus 000, and fig. 8 illustrates the implementation of the binary encoding 101. Wherein (a) shows the digital sequence alpha of I/O pin output of digital chip in control module2n-1(k)-α2n(k) The ultrasonic excitation module is controlled by the digital sequence to generate a high-energy excitation signal xn(t) of (d). (b) The figure shows the high-energy excitation signal x output by the ultrasonic excitation modulen(t), in the embodiment, the ultrasonic excitation module receives power supply of a +/-50V direct current voltage source, the amplitude of the ultrasonic signal can be changed by changing the power supply value of the direct current voltage source, and (c) the figure shows that the high-energy excitation signal xn(t) exciting the ultrasonic sensor hn(t) the resulting measured ultrasonic signal yn(t) of (d). The parameters of the center frequency, the phase, the duration, the repetition frequency, the code element combination and the like of the signal can be adjusted by programming and changing the digital sequence output by the control module.
The description in the examples is only for the specific illustration of the feasible embodiments of the present invention and is not intended to limit the scope of the present invention. All equivalent embodiments or modifications that do not depart from the technical spirit of the present invention should be included within the scope of the present invention.

Claims (5)

1. A method of driving an ultrasonic transducer in a digital sequence, the method comprising:
s1, forming a control module by digital chips to generate logic level as a digital sequence a (k);
s2, forming an ultrasonic excitation module by ultrasonic excitation chips to generate a high-energy excitation signal xn(t)；
The step S2 specifically includes:
the number of the digital sequences output by the control module is determined by the number of the ultrasonic sensors required to be excited, and the length of the digital sequences is determined by the type of the ultrasonic signals required to be excited;
the power supply form of the ultrasonic excitation module is bipolar direct-current voltage power supply, the power supply adopts an AC-DC mode, 220V alternating current is converted into a direct-current adjustable voltage source, and the voltage value of the direct-current voltage source is the amplitude of the high-energy excitation signal;
the step S2 further includes:
the ultrasonic excitation chip is controlled by the control module through logic level, every 2 control pins control 1 path of ultrasonic excitation signal, and 1 path of high-energy excitation signal x1(t) 2-way digital sequence alpha corresponding thereto1(k) And alpha2(k) Performing combination control, regarding the digital sequence as a rising edge of the high-energy excitation signal when the digital sequence jumps from 0 to 1, regarding the digital sequence as a falling edge of the high-energy excitation signal when the digital sequence jumps from 1 to 0, and keeping the output of the high-energy excitation signal when the digital sequence is 1 and does not jump, thereby forming a control relation x between the digital sequence and the high-energy excitation signal1(t)＝α1(k)EG(t-k1τ1)-α2(k)EG(t-k2τ2) Wherein G (t-k τ) is a window function of length τ and
Figure FDA0003230842680000011
the time constant tau is the holding time of the high level of the digital sequence; e is a power supplyThe module provides the DC voltage amplitude value for the ultrasonic excitation module; the high-energy excitation signals are independent to each other and can simultaneously generate different high-energy excitation signals x1(t) to xn(t) in the form of a graph of,
Figure FDA0003230842680000012
wherein alpha is2n-1(k) And alpha2n(k) Respectively 2n-1 and 2n digital sequences; k is the total length of the excitation signal, G (t-K)2n-1τ2n-1) Is of length τ2n-1Window function of, G (t-k)2nτ2n) Is of length τ2nA window function of, and
Figure FDA0003230842680000013
Figure FDA0003230842680000014
and
Figure FDA0003230842680000015
logic values of 0 or 1 are given by the control module;
Figure FDA0003230842680000016
is a fundamental frequency of ω2n-1The square wave signal Fourier trigonometric function expansion of (1),
Figure FDA0003230842680000017
is a fundamental frequency of ω2nSquare wave signal fourier trigonometric function expansion, ω2n-1And omega2nI.e. from alpha2n-1(k)G(t-k2n-1τ2n-1) And alpha2n(k)EG(t-k2nτ2n) Controlling; e is the DC voltage amplitude value provided by the power module to the ultrasonic excitation module; n is an element of Z+The number of the required excitation sensors is;
s3, exciting the ultrasonic sensor by the high-energy exciting signal to generate ultrasonic with controllable exciting signalWave signal yn(t)。
2. The method of claim 1, wherein the step S1 is specifically as follows:
the control module generates logic level with high level being +3.3V and low level being 0V as digital sequence control signal alpha (k) by programming, the expression of single-path digital sequence alpha (k) output by the control module is as follows:
Figure FDA0003230842680000021
where K is the total length of the sequence, the step size of K being determined by the clock signal of the control module, bkIs a logic value of 0 or 1 given by the control module, A is a logic level amplitude, a logic sequence of the digit sequence bkThe change is made by programming.
3. The digital sequence driven ultrasonic sensor method according to claim 1, wherein the step S2 further comprises:
the control of the form of the ultrasonic excitation signal is realized by programming a control module, wherein the central frequency, the phase, the pulse width, the pulse number, the code element frequency, the code element combination, the coding duration and the repetition frequency parameter of the excitation signal are all changed by the control module to control the logic time sequence of a control pin
Figure FDA0003230842680000022
And
Figure FDA0003230842680000023
logic level duration G (t-k)2n-1τ2n-1) And G (t-k)2nτ2n) To adjust.
4. The method for driving ultrasonic transducer by digital sequence according to claim 2, characterized in that the specific process of programming is as follows: the control module FPGA program generates a 'jic' file after being compiled and debugged by development software, the FPGA program is downloaded to the SPI FLASH to be solidified in a JTAG mode, and the solidified program in the SPI FLASH is read by the No. 33 to No. 36 program pins of the FPGA to operate the control module.
5. The apparatus of the digital sequence driven ultrasonic sensor method of claim 1, comprising a control module, an ultrasonic excitation module and an ultrasonic sensor module; the control module is respectively connected with the power supply and the ultrasonic excitation module, and the ultrasonic excitation module is connected with the ultrasonic sensor module; the control module is used for generating logic level as a digital sequence; the ultrasonic excitation module is used for generating a high-energy excitation signal, and the high-energy excitation signal excites the ultrasonic sensor to generate an ultrasonic signal with controllable excitation signal.
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