CN114217323A - Method for reducing residual vibration of ultrasonic sensor, ultrasonic chip and ultrasonic device - Google Patents

Abstract

The invention discloses a method for reducing residual vibration of an ultrasonic sensor, an ultrasonic chip and an ultrasonic device, wherein the method for reducing the residual vibration of the ultrasonic sensor can adopt a scheme I or a scheme II, wherein the scheme I comprises the following steps: s1, sampling amplitude values of n first sampling points of residual vibration of the ultrasonic sensor by using an AD module, wherein n is a natural number; then, the DA module outputs voltage values with the same amplitude but opposite phases to offset and compensate the first n sampling points; s2, sampling the amplitude values of the n sampling points for the second time by using the AD module, and then outputting voltage values with the same amplitude value but opposite phases by using the DA module again to offset compensation; s3, repeating the steps S1 and S2 until the residual vibration value is in a required range; the second scheme is that after ADC sampling, the DAC is directly controlled to output signals with the same value but opposite phases to the ultrasonic sensor. The invention can obviously reduce the aftershock and generate the jump obviously reducing change.

Description

Method for reducing residual vibration of ultrasonic sensor, ultrasonic chip and ultrasonic device

Technical Field

The invention relates to the technical field of sensing and information processing, in particular to a method for reducing residual vibration of an ultrasonic sensor, an ultrasonic chip and an ultrasonic device.

Background

Ultrasonic sensors have many applications in various fields, such as in the detection of liquid levels, sensing of liquid levels of various liquids, sensing of transparencies and materials, controlling tension and measuring distance, and in the field of reversing radar, anti-collision systems and automatic parking assistance systems, ADAS systems, all having the silhouette of the ultrasonic sensor. Ultrasonic sensors have very wide application in reversing radars.

The key part of the ultrasonic sensor is a probe core, namely a piezoelectric ceramic piece, the probe core is driven by alternating voltage to be mechanically bent to drive air to vibrate, so that ultrasonic waves are sent out, when an alternating driving signal disappears, the mechanical vibration does not stop immediately due to the physical characteristics of the piezoelectric ceramic, and a stopping process, namely residual vibration, exists. Due to the existence of aftervibration, when a barrier reflection signal is generated in the aftervibration process, the aftervibration cannot be received, so that the aftervibration distance section is a blind area, the system cannot identify the barrier, parking collision can possibly occur, and the system performance is reduced.

It is known in the art that the existence of residual vibration can cause a system blind area, so many people want to reduce the residual vibration to reduce the blind area, and although the improvement is achieved, the improvement degree is not great, the effect is not obvious, and the jump is not promoted because the adopted method is not ideal.

At present, the following methods are generally adopted in the market to reduce the aftershock:

referring to fig. 1, after a series of transmitting waves, residual oscillation is generated, the residual oscillation is generally greater than 1.5mS when no compensation is performed, the compensation opportunity is reduced to about 1.2mS by using reverse cancellation pulses, the principle is that the oscillation waves of the series of transmitting waves are cancelled by using pulses with opposite phases, in the figure, P1, P2 and P3 … are the number of the compensation pulses, T0 is the starting position of the compensation pulses, T is the width of the compensation pulses, the number of pulses P1, P2 and P3 …, T0 and T are generally settable, the setting is set according to practical situations, and how much of the setting depends on the principle that the residual oscillation energy is reduced to the minimum, and the problem is that:

1. the residual vibration amplitude of each sensor is different due to the discreteness, but the compensation pulse amplitude is fixed, so that the conditions of all the sensors cannot be considered, namely all the sensors cannot be completely compensated, the compensation effect is slightly different among the sensors, and the discreteness is large;

2. aftervibration is generally large in front pulse amplitude and small in rear amplitude, but the compensation pulse amplitude is fixed, so that the front pulse compensation amplitude is possibly insufficient, the rear pulse compensation is too early, and the front pulse and the rear pulse cannot be well compensated;

3. the situation of the former pulse of the residual vibration often influences the change of the latter pulse, and the fixed pulse compensation is adopted, so that how the latter pulse changes after the former pulse is compensated cannot be predicted at all, but the same compensation pulse is used for compensating, and the compensation is slightly blind;

4. because the amplitude of the rear section of the residual vibration is generally smaller, and the amplitude of the compensation pulse is fixed in the whole process, the front pulses are generally compensated, the rear pulses with small amplitude are generally not compensated, but the pulses are part of the residual vibration, so that the residual vibration cannot be completely compensated, namely, the residual vibration is not compensated, namely, the residual vibration only has quantitative change, and the jump-reduction change cannot be generated;

5. it can be known from the above points 1 to 4 that there is a situation that the compensation is over-head or the front section compensation is good and the back section compensation is not in place, as shown in fig. 2, the consequence of this is that the tip may be pulled, that is, the compensation pulse over-head or the residual vibration not in place compensation is mistakenly identified as the obstacle signal, and the effect is false, and in reality, people with few experiences in this aspect eat the bitter head.

In summary, this residual oscillation compensation method only improves, but cannot produce a significant reduction change in the jump.

Disclosure of Invention

In view of the above, in order to solve the above-mentioned problems, an object of the present invention is to provide a method for reducing residual vibration of an ultrasonic sensor, an ultrasonic chip and an ultrasonic apparatus, which can significantly reduce residual vibration and generate a significant change in reduction.

The adopted technical scheme is as follows:

the method for reducing the residual vibration of the ultrasonic sensor can adopt a scheme I or a scheme II, wherein the scheme I comprises the following steps:

s1, sampling amplitude values of n first sampling points of residual vibration of the ultrasonic sensor by using an AD module, wherein n is a natural number; then, the DA module outputs voltage values with the same amplitude but opposite phases to offset and compensate the first n sampling points;

s2, sampling the amplitude of the second n sampling points of the residual vibration of the ultrasonic sensor by using an AD module, and then outputting voltage values with the same amplitude but opposite phases by using a DA module to offset and compensate the second n sampling points;

s3, repeating the steps S1 and S2 until the residual vibration value is in a required range;

the second scheme comprises the following steps:

after sampling, the ADC directly controls the DAC to output signals with the same value but opposite phases to the ultrasonic sensor.

Further, in scheme one, S3 needs to be in the range of less than 0.5 mS.

The invention relates to an ultrasonic chip for reducing residual vibration of an ultrasonic sensor, which is integrated with:

and the AD module is used for sampling the amplitude values of n sampling points of m times of residual vibration of the ultrasonic sensor, wherein n is a natural number, and m is a natural number greater than 2.

And the DA module is used for outputting voltage values with the same amplitude but opposite phases to offset and compensate the n sampling points at each time.

The invention provides an ultrasonic device for reducing residual vibration of an ultrasonic sensor, comprising:

the ultrasonic sensor generates a residual vibration wave signal after sending an ultrasonic signal;

a signal amplifier for amplifying a signal;

an ADC for converting an analog signal of the ringing signal into a digital signal;

a DSP for processing the digital signal;

the logic circuit is used for logically controlling the processing of the DSP digital signals so as to output digital control signals with the same value but opposite phases;

the DAC is controlled by the logic circuit and is used for converting the digital signals into analog signals to be output;

and a booster circuit for boosting the analog signal and feeding the boosted analog signal back to the ultrasonic sensor.

Further, the signal amplifier comprises a first-stage signal amplifier and a second-stage signal amplifier which are connected in series.

The invention has the beneficial effects that:

the first scheme has the advantages that:

1. point-to-point compensation is carried out, the amplitude values are completely equivalent, and the theory of insufficient compensation or over compensation does not exist, so that the compensation effect is the best;

2. all the back points are compensated after being rescanned after the compensation of the front points, so that the situation that the back points are changed after the compensation of the front points is avoided, and each point compensation is ensured to be symmetrical;

3. the compensation method is flexible, for example, if the magnitude of the residual oscillation value is to be considered preferentially, a compensation mode with a small value n can be adopted, theoretically, the residual oscillation value caused by the fact that n is 1 is the smallest, but the compensation time is long, if the requirement of the residual oscillation value is not high, and meanwhile, the compensation time is to be saved, a mode with a large value n can be adopted, if n is the number of sampling points of a residual oscillation pulse, the compensation can be considered to be performed pulse by pulse, namely, one pulse is compensated each time, so that the compensation time is short, but the compensation is not thorough, and the compensated residual oscillation value is large; how to compensate is decided by the user according to the needs, and the mode is flexible.

4. The above modes only use conventional and mature AD and DA modules, and the integration of the two modules in the ultrasonic chip is easy to realize, the cost is low, but the effect is obvious, namely, the aftervibration can be obviously reduced, and the jump change is obviously reduced.

The second scheme also has the advantages of easy realization, obvious production effect, flexible use and low cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic diagram of waveforms in a method for reducing aftervibration commonly used in the market in the background art.

Fig. 2 is a schematic diagram of the generation of the flare in the method of reducing aftervibration generally used in the market in the background art.

Fig. 3 is a schematic waveform diagram illustrating a method for reducing aftervibration of an ultrasonic sensor according to embodiment 1.

Fig. 4 is an enlarged waveform diagram at a in fig. 3.

Fig. 5 is a schematic structural view of an ultrasonic apparatus for reducing aftervibration of an ultrasonic sensor according to embodiment 2.

Detailed Description

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 only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 3-4, a method for reducing aftervibration of an ultrasonic sensor according to the present embodiment includes the following steps:

s1, sampling amplitude values of n first sampling points of residual vibration of the ultrasonic sensor by using an AD module, wherein n is a natural number; then, the DA module outputs voltage values with the same amplitude but opposite phases to offset and compensate the first n sampling points; as a specific embodiment, referring to fig. 3-4, the amplitude of the first n sampling points of the residual oscillation is sampled by AD (e.g. V1, V2, V3, V4, V5, V6, V7, V8 in fig. 4), and then the n sampling points are offset-compensated by DA outputting voltage values with the same amplitude but opposite phases (i.e., -V1, -V2, -V3, -V4, -V5, -V6, -V7, -V8);

s2, sampling the amplitude of the second n sampling points of the residual vibration of the ultrasonic sensor by using an AD module, and then outputting voltage values with the same amplitude but opposite phases by using a DA module to offset and compensate the second n sampling points;

and S3, repeating the steps S1 and S2 until the residual oscillation value falls within a required range, for example, until the residual oscillation value is less than 0.5 mS.

The method has the advantages that:

1. point-to-point compensation is carried out, the amplitude values are completely equivalent, and the theory of insufficient compensation or over compensation does not exist, so that the compensation effect is the best;

2. all the back points are compensated after being rescanned after the compensation of the front points, so that the situation that the back points are changed after the compensation of the front points is avoided, and each point compensation is ensured to be symmetrical;

3. the compensation method is flexible, for example, if the magnitude of the residual oscillation value is to be considered preferentially, a compensation mode with a small value n can be adopted, theoretically, the residual oscillation value caused by the fact that n is 1 is the smallest, but the compensation time is long, if the requirement of the residual oscillation value is not high, and meanwhile, the compensation time is to be saved, a mode with a large value n can be adopted, if n is the number of sampling points of a residual oscillation pulse, the compensation can be considered to be performed pulse by pulse, namely, one pulse is compensated each time, so that the compensation time is short, but the compensation is not thorough, and the compensated residual oscillation value is large; how to compensate is decided by the user according to the needs, and the mode is flexible.

4. The method can obviously reduce the residual oscillation, generate jump obvious reduction change and enable the residual oscillation value to fall within a required range, for example, the residual oscillation value is less than 0.5 mS. Wherein, the 'obvious reduction and change of jump' is no tip-pulling phenomenon, and the compensation is in place, so that the residual vibration value can fall in a required range.

Example 2

Corresponding to the method for reducing the residual vibration of the ultrasonic sensor in embodiment 1, a corresponding ultrasonic chip for reducing the residual vibration of the ultrasonic sensor may be provided, and an AD module and a DA module are integrated in the ultrasonic chip.

The AD module is used for sampling the amplitude of m times of n sampling points of the residual vibration of the ultrasonic sensor, wherein n is a natural number, and m is a natural number larger than 2.

And the DA module is used for outputting voltage values with the same amplitude but opposite phases to offset and compensate the n sampling points at each time.

The AD values of the residual vibration points are sampled through an AD module, then DA values with the same value and opposite phases are output corresponding to the positions to counteract the residual vibration, the AD value of the next point is scanned when one point is compensated, and the DA values corresponding to the positions are compensated by the same method until the residual vibration is reduced to a reasonable range.

Therefore, the phase compensation of the residual vibration points can be performed in a targeted manner, the position and the numerical value cannot deviate, the situation of over-head compensation is not caused, the scanning is performed after the compensation at the same time, the compensation is performed after the scanning is performed after the compensation at the same time, the residual vibration AD value of the next point is effectively prevented from being changed after the compensation at the previous point is performed, the residual vibration AD value of each point is compensated in place, and the compensation is thorough.

The AD module and the DA module can only use the conventional and mature AD module and DA module, the integration of the two modules in the ultrasonic chip is easy to realize, the cost is low, but the effect is obvious, namely the aftervibration can be obviously reduced, and the jump change is obviously reduced.

Example 3

The method for reducing the residual vibration of the ultrasonic sensor comprises the following steps:

after sampling, the ADC directly controls the DAC to output signals with the same value but opposite phases to the ultrasonic sensor.

Compared with embodiment 1, the present embodiment also has the advantages of easy implementation, obvious production effect, flexible use and low cost.

Example 4

To implement the method of embodiment 2, an ultrasonic device for reducing the aftervibration of the ultrasonic sensor is correspondingly provided, and as shown in fig. 5, the ultrasonic device includes an ultrasonic sensor 1, a signal amplifier, an ADC 3, a DSP 4, a logic circuit 5, a DAC 6, and a voltage boost circuit 7.

Wherein, the ultrasonic sensor 1 generates a residual vibration wave signal after sending out an ultrasonic signal;

a signal amplifier 2 for amplifying a signal; as a specific embodiment, the signal amplifier may have two stages, including a first stage signal amplifier 21 and a second stage signal amplifier 22 connected in series.

An ADC 3 for converting an analog signal of the aftervibration wave signal into a digital signal;

a DSP 4 for processing the digital signal;

a logic circuit 5 for logically controlling the processing of the DSP digital signals to output digital control signals of the same value but opposite phases;

a DAC 6 controlled by the logic circuit for converting the digital signal into an analog signal output;

and a booster circuit 7 for boosting the analog signal and feeding the boosted analog signal back to the ultrasonic sensor.

An ADC, i.e., an analog-to-digital converter; a DAC (digital-to-analog converter); a DSP, i.e. a signal processor; the ultrasonic sensor, the signal amplifier, the ADC, the DSP, the logic circuit and the DAC are all the existing mature modules, and those skilled in the art can implement the ultrasonic sensor, the signal amplifier, the ADC, the DSP, the logic circuit and the DAC according to the above-mentioned applications. The present embodiment creatively integrates these modules into an ultrasound device to solve the specific technical problems of the present invention and achieve specific technical effects: namely, the aftervibration can be reduced remarkably, and the jump reduction change can be generated remarkably.

The embodiment 1-2 is a point-by-point compensation mode after point-by-point sampling, the required time is slightly long, and if a certain requirement is imposed on the sampling time, a direct compensation implementation mode after sampling in the embodiment 3-4 can also be adopted: the method is that the output value of the DAC is directly controlled to be the same after ADC sampling, but signals with opposite phases are sent to the ultrasonic sensor, and the method slightly delays from ADC sampling to DAC output, but the delay can be ignored as long as the delay time can be accepted or a certain compensation value is made on a system, and the delay is within an allowable range.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (5)

1. A method for reducing the residual vibration of an ultrasonic sensor is characterized in that a scheme I or a scheme II can be adopted, wherein the scheme I comprises the following steps:

s1, sampling amplitude values of n first sampling points of residual vibration of the ultrasonic sensor by using an AD module, wherein n is a natural number; then, the DA module outputs voltage values with the same amplitude but opposite phases to offset and compensate the first n sampling points;

s2, sampling the amplitude of the second n sampling points of the residual vibration of the ultrasonic sensor by using an AD module, and then outputting voltage values with the same amplitude but opposite phases by using a DA module to offset and compensate the second n sampling points;

s3, repeating the steps S1 and S2 until the residual vibration value is in a required range;

the second scheme comprises the following steps:

after sampling, the ADC directly controls the DAC to output signals with the same value but opposite phases to the ultrasonic sensor.

2. The method of claim 1, wherein S3 is in a range less than 0.5mS as required in scenario one.

3. An ultrasonic chip for reducing aftervibration of an ultrasonic sensor, wherein:

and the AD module is used for sampling the amplitude values of n sampling points of m times of residual vibration of the ultrasonic sensor, wherein n is a natural number, and m is a natural number greater than 2.

And the DA module is used for outputting voltage values with the same amplitude but opposite phases to offset and compensate the n sampling points at each time.

4. An ultrasonic device for reducing aftervibration of an ultrasonic sensor, comprising:

the ultrasonic sensor generates a residual vibration wave signal after sending an ultrasonic signal;

a signal amplifier for amplifying a signal;

an ADC for converting an analog signal of the ringing signal into a digital signal;

a DSP for processing the digital signal;

the logic circuit is used for logically controlling the processing of the DSP digital signals so as to output digital control signals with the same value but opposite phases;

the DAC is controlled by the logic circuit and is used for converting the digital signals into analog signals to be output;

and a booster circuit for boosting the analog signal and feeding the boosted analog signal back to the ultrasonic sensor.

5. The ultrasonic apparatus for reducing aftervibration of an ultrasonic sensor according to claim 1, wherein the signal amplifier comprises a first-stage signal amplifier and a second-stage signal amplifier connected in series.

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