CN116626684A - Ultrasonic Parametric detection system - Google Patents
Ultrasonic Parametric detection system Download PDFInfo
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- CN116626684A CN116626684A CN202310372460.6A CN202310372460A CN116626684A CN 116626684 A CN116626684 A CN 116626684A CN 202310372460 A CN202310372460 A CN 202310372460A CN 116626684 A CN116626684 A CN 116626684A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/08—Systems for measuring distance only
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- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention discloses an ultrasonic Parametric detection system, which comprises: the carrier generation processing module generates ultrasonic waves with a first frequency as a carrier; the signal wave generation processing module generates ultrasonic waves with a second frequency as signal waves, wherein the first frequency is larger than the second frequency; the modulation wave generating circuit generates a modulation wave according to the signal wave and the carrier wave; the high-voltage generation circuit amplifies the modulation wave; the high-voltage generating circuit also drives the ultrasonic transceiver to emit amplified modulated waves, and the amplified modulated waves are subjected to self-demodulation in the air through nonlinear action to obtain self-demodulation waves; the ultrasonic transceiver also receives the reflected wave from the demodulation wave; the filtering amplifying circuit amplifies and filters the reflected wave; the CPU processing unit determines a distance value between the object and the ultrasonic transceiver according to the reflected wave and the modulated wave. The system can realize detection at a longer distance simultaneously under the condition of better directivity and narrower range detection.
Description
Technical Field
The invention relates to the technical field of ultrasonic detection, in particular to an ultrasonic Parametric detection system.
Background
In a conventional ultrasonic detection system, an ultrasonic microphone transmits ultrasonic waves, a reflected reception wave from an object is amplified by a filter and amplifier circuit, a distance determination process is performed by using the reception wave input, and a distance output process is performed to output a distance detection result.
The system often adopts the ultrasonic wave of single frequency, and when using the sound wave of frequency height, the propagation acoustic pressure decay of high frequency sound wave is fast, can not carry out long distance propagation, and in order to lengthen the distance, just use the sound wave of frequency low, the propagation decay of low frequency sound wave diminishes, can realize long distance detection, but can not realize narrow directionality generally under the low frequency, and wider directionality introduces external interference easily, reduces the detection accuracy.
In summary, in the conventional ultrasonic detection system, the sound pressure attenuation speed of the sound wave and the detection distance are both short and long, which makes it difficult to achieve both, and the disadvantage is obvious, so that improvement is required.
Disclosure of Invention
The invention provides an ultrasonic Parametric detection system which is used for overcoming at least one technical problem existing in the prior art.
The embodiment of the invention provides an ultrasonic Parametric detection system, which comprises:
the carrier generation processing module is used for generating ultrasonic waves with a first frequency as a carrier;
a signal wave generation processing module for generating an ultrasonic wave of a second frequency as a signal wave, wherein the first frequency is greater than the second frequency;
a modulated wave generation circuit configured to generate a modulated wave from the signal wave and the carrier wave;
a high voltage generation circuit for amplifying the modulated wave;
the high-voltage generating circuit is also used for driving the ultrasonic wave receiving and transmitting device to transmit amplified modulated waves, the amplified modulated waves are subjected to self-demodulation in the air through nonlinear action to obtain self-demodulation waves, and the ultrasonic wave receiving and transmitting device is also used for receiving reflected waves of the self-demodulation waves reflected by an object;
the filtering amplification circuit is used for amplifying and filtering the reflected wave;
and the CPU processing unit comprises a distance judging module which is used for determining a distance value between the object and the ultrasonic transceiver according to the reflected wave and the modulated wave.
Optionally, the CPU processing unit further includes a distance output module, where the distance output module is configured to output the distance value.
Optionally, the ultrasonic transceiver includes a transmitting microphone for transmitting a carrier frequency band and a receiving microphone capable of receiving a signal wave band.
Optionally, the ultrasonic Parametric detection system includes: the modulation wave generation circuit is used for modulating the signal wave onto the carrier wave to obtain the modulation wave.
Optionally, the transmitting microphone and the receiving microphone are integrally designed.
Optionally, the distance determining module is configured to determine a distance value between the object and the ultrasonic transceiver according to the transmission time of the modulated wave and the reception time of the reflected wave.
Optionally, the CPU processing unit further includes a time management module, where the time management module is configured to transmit signals to the carrier generating processing module and the signal wave generating processing module, so that the carrier generating processing module generates an ultrasonic wave with a first frequency as a carrier wave and the signal wave generating processing module generates an ultrasonic wave with a second frequency as a signal wave.
Compared with the prior art, the invention has the beneficial effects that:
the ultrasonic Parametric detection system provided by the invention utilizes the nonlinear phenomenon of sound waves, superimposes signal waves with lower frequency on carriers with higher frequency, outputs high sound pressure of the nonlinear phenomenon of sound waves, generates self-demodulation waves in the region of the carrier propagation, and the generated self-demodulation waves are components of low-frequency signal waves, so that the self-demodulation waves can be propagated to a distance longer than the carrier. Further, since the carrier wave uses a high frequency, the carrier wave has a narrow directivity, and the self-demodulation wave is generated in a region where the carrier wave propagates, so that the directivity of the self-demodulation wave, that is, the signal wave can also be maintained at a narrow directivity, and further, the detection of the ultrasonic directivity in a narrow range can be realized, and the detection of a longer distance can also be realized.
The innovation points of the embodiment of the invention include:
the high-voltage generating circuit is used for realizing high sound pressure output by the carrier wave by superposing the signal wave with lower frequency on the carrier wave with higher frequency, so that the self-demodulation is carried out in the air by utilizing the nonlinear phenomenon of the sound wave and the self-demodulation wave is generated in the area where the carrier wave propagates, therefore, the directionality of the self-demodulation wave, namely the signal wave, can maintain the same narrow directionality as the high-frequency carrier wave, the detection of a longer distance is realized, and the speed of sound pressure attenuation and the detection distance are considered to the greatest extent.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system architecture diagram of a conventional ultrasonic Parametric detection system;
FIG. 2 is a schematic diagram of a conventional transceiver wave in the prior art;
FIG. 3 is a schematic diagram of a conventional object detection method;
FIG. 4 is a block diagram of an ultrasonic Parametric detection system according to an embodiment of the present invention;
FIG. 5 is a block diagram of an ultrasonic Parametric detection system according to an embodiment of the present invention;
FIG. 6 is a schematic view of a transceiver in the ultrasonic Parametric detection system shown in FIG. 5;
FIG. 7 is a block diagram of an ultrasonic Parametric detection system according to yet another embodiment of the present invention;
FIG. 8 is a schematic view of the transceiver waves in the ultrasonic Parametric detection system shown in FIG. 7;
FIG. 9 is a schematic diagram of the occurrence of self-demodulation waves;
fig. 10 is a schematic view of the attenuation characteristics of ultrasonic waves;
fig. 11 is a schematic diagram of detection distances of the detection system shown in fig. 5 and 7.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "comprising" and "having" and any variations thereof in the embodiments of the present invention and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
For a better understanding of embodiments of the present invention, an ultrasound inspection system commonly used in the art will first be described. In the conventional ultrasonic detection system, an ultrasonic microphone transmits ultrasonic waves, a reflected reception wave from an object is amplified by a filter and amplification circuit, then a distance determination process is performed by using the reception wave input, and finally a distance output process is performed to output a distance detection result. In this system, a "transmission wave generating circuit" is used which generates an ultrasonic wave of a single frequency, and when an acoustic wave of a high frequency is used, the propagation sound pressure of the acoustic wave of the high frequency is attenuated quickly, and the acoustic wave cannot propagate over a long distance. Therefore, in the basic function of the existing ultrasonic detection system, the disadvantages of the sound pressure attenuation speed and the detection distance of the sound wave are obvious.
Fig. 1 is a schematic diagram of a conventional ultrasonic detection system, which is configured by a "transmission wave generating circuit" that generates ultrasonic waves of a single frequency, an "ultrasonic Microphone" that transmits ultrasonic waves to an output from the generating circuit, a "filter amplifier circuit" that amplifies reflected received waves from an object, a "distance determination processing unit" that performs distance determination using received wave input, and a "CPU" that controls these signals, as shown in fig. 1. The "CPU" determines the "distance" at which the object exists by the "distance determination processing unit" and outputs the detection result.
Fig. 2 is a schematic diagram of a conventional transceiver in the prior art. In the output of the filter amplification circuit, ultrasonic waves transmitted between t0 and t1 are received after being reflected by an object, the receiving time of the reflected waves of the object is between t0 and t2, and the distance of the object can be calculated according to the delay time t 2.
Fig. 3 is a schematic diagram of an object detection method according to the prior art. For example, the maximum detection distance when the transmission frequency of 58kHz is used is about 5 m. This is because the frequency of the acoustic wave used is high, so that the propagation sound pressure of the acoustic wave is fast attenuated and cannot propagate over a long distance. In order to extend the distance, a low frequency, for example, 20kHz, can be used, the propagation attenuation of the sound wave thereof becomes small, and long-distance detection can be achieved, but narrow directivity cannot be generally achieved at a low frequency.
In view of the above, the conventional ultrasonic-based object detection method is difficult to achieve both detection distance and detection sensitivity, and has a high detection error rate, so that improvement is required.
The embodiment of the specification discloses an ultrasonic Parametric detection system and method. The following will describe in detail.
Fig. 4 is a block diagram of an ultrasonic Parametric detection system according to an embodiment of the present invention. As shown in fig. 1, the ultrasonic Parametric detection system 400 includes:
a carrier generation processing module 401 for generating an ultrasonic wave of a first frequency as a carrier;
a signal wave generation processing module 402 for generating an ultrasonic wave of a second frequency as a signal wave, wherein the first frequency is greater than the second frequency;
a modulated wave generating circuit 403 for generating a modulated wave from the signal wave and the carrier wave;
a high voltage generation circuit 404 for amplifying the modulated wave;
the ultrasonic transceiver 405 is further configured to drive the ultrasonic transceiver to emit an amplified modulated wave, and the amplified modulated wave is self-demodulated in air by nonlinear action to obtain a self-demodulated wave, and the ultrasonic transceiver is further configured to receive a reflected wave of the self-demodulated wave reflected by an object;
a filter amplification circuit 406 for amplifying and filtering the reflected wave;
the CPU processing unit 407 includes a distance determination module for determining a distance value between the object and the ultrasonic transceiver from the reflected wave and the modulated wave.
When a high voltage is applied to a transmitting element such as an ultrasonic microphone to emit a high sound pressure into the air, an ultrasonic wave causes a nonlinear phenomenon of an acoustic wave due to a parameter change of the sound velocity, and the acoustic wave itself generates a demodulation wave.
The high-voltage generating circuit is used for realizing high sound pressure output by the carrier wave by superposing the signal wave with lower frequency on the carrier wave with higher frequency, so that the self-demodulation is carried out in the air by utilizing the nonlinear phenomenon of the sound wave and the self-demodulation wave is generated in the area where the carrier wave propagates, therefore, the directionality of the self-demodulation wave, namely the signal wave, can maintain the same narrow directionality as the high-frequency carrier wave, the detection of a longer distance is realized, and the speed of sound pressure attenuation and the detection distance are considered to the greatest extent.
In the ultrasonic Parametric detection system, a signal wave having a low frequency is superimposed on a carrier wave having a high frequency by utilizing the nonlinear phenomenon of an acoustic wave, and a carrier wave output generates a high sound pressure of the nonlinear phenomenon of the acoustic wave, and a self-demodulation wave is generated in a region where the carrier wave propagates, and the generated self-demodulation wave is a component of a low-frequency signal wave, so that the self-demodulation wave can propagate to a distance longer than the carrier wave. Further, since the carrier wave uses a high frequency, the carrier wave has a narrow directivity, and the self-demodulation wave is generated in a region where the carrier wave propagates, so that the directivity of the self-demodulation wave, that is, the signal wave can also be maintained at a narrow directivity, and further, the detection of the ultrasonic directivity in a narrow range can be realized, and the detection of a longer distance can also be realized.
In one implementation, the CPU processing unit further includes a distance output module, where the distance output module is configured to output the distance value.
In one implementation, the ultrasonic transceiver includes a transmit microphone that includes a transmit carrier frequency band and a receive microphone that is capable of receiving a signal wave band.
In one implementation, the ultrasonic Parametric detection system includes: the modulation wave generation circuit is used for modulating the signal wave onto the carrier wave to obtain the modulation wave.
In one implementation, the transmit microphone and the receive microphone are of an integrated design.
In one implementation, the distance determining module is configured to determine a distance value between the object and the ultrasonic transceiver according to a transmission time of the modulated wave and a reception time of the reflected wave.
In one implementation, the CPU processing unit further includes a time management module configured to transmit signals to the carrier generation processing module and the signal wave generation processing module, respectively, so that the carrier generation processing module generates an ultrasonic wave of a first frequency as a carrier wave and the signal wave generation processing module generates an ultrasonic wave of a second frequency as a signal wave.
Fig. 5 is a schematic diagram of an ultrasonic Parametric detection system according to an embodiment of the present invention. As shown in fig. 5, an ultrasonic Parametric detection system includes a "CPU" processing unit, a "modulated wave generating circuit", a "high voltage generating circuit", a "filter amplifying circuit", a "transmitting Microphone" and a "receiving Microphone". The CPU processing unit comprises a time management processing module, a carrier wave generation processing module, a signal wave generation processing module, a distance judgment processing module and a distance output processing module.
The carrier generation processing module and the signal wave generation processing module respectively receive the time management processing module and generate a carrier wave (such as ultrasonic wave of 58 kHz) and a signal wave (such as ultrasonic wave of 20 kHz); the modulated wave generating circuit combines the 2 ultrasonic waves at the frequencies and outputs a modulated wave, and the modulated wave passes through the high-voltage circuit generating circuit and drives 58kHz to transmit the corresponding modulated wave by the transmitting Microphone. The 20kHz receives the reflected wave from the object by using the receiving Micyophone, the reflected wave is processed by the filtering amplifying circuit, the output received wave enters the distance judging processing module in the CPU processing unit to carry out distance calculation, and finally the output is output by the distance output processing module.
Fig. 6 is a schematic view of a transceiver in the ultrasonic parameter detection system shown in fig. 5. As shown in fig. 6, in the output of the filter amplifier circuit, the transmitted modulated ultrasonic waves are represented between t0 and t1, reflected waves of the object can be received between t0 and t2, and the distance of the object can be calculated from the delay time t 2.
Fig. 7 is a schematic diagram of an ultrasonic Parametric detection system according to another embodiment of the present invention. As shown in fig. 7, an ultrasonic Parametric detection system includes a "CPU" processing unit, a "modulated wave generating circuit", a "high voltage generating circuit", a "filter amplifying circuit", and a "large broadband Microphone" capable of simultaneously transmitting and receiving a carrier wave (e.g., 58 kHz) and a signal wave (e.g., 20 kHz). The CPU processing unit comprises a time management processing module, a carrier wave generation processing module, a signal wave generation processing module, a distance judgment processing module and a distance output processing module.
The carrier generation processing module and the signal wave generation processing module respectively receive the time management processing module and generate a carrier wave (such as ultrasonic wave of 58 kHz) and a signal wave (such as ultrasonic wave of 20 kHz); the modulating wave generating circuit combines the ultrasonic waves with the 2 frequencies and outputs modulating waves, and the modulating waves drive the large broadband Microphone to send corresponding modulating waves after passing through the high-voltage circuit generating circuit. The large broadband Microphone receives reflected waves from an object, the reflected waves are processed by the filtering amplification circuit, the output received waves enter the distance judgment processing module in the CPU processing unit to perform distance calculation, and finally the output is output by the distance output processing module.
Fig. 8 is a schematic view of a transceiver in the ultrasonic parameter detection system shown in fig. 7. As shown in fig. 8, in the output of the filter amplifier circuit, the transmitted modulated ultrasonic waves are represented between t0 and t1, reflected waves of the object can be received between t0 and t2, and the distance of the object can be calculated from the delay time t 2.
The present invention proposes an ultrasonic detection system in which an ultrasonic sensor that utilizes the nonlinear phenomenon (parameterization effect) of an acoustic wave, superimposes a signal wave (the signal wave uses the frequency of an ultrasonic region, i.e., the frequency of a non-audible region) on a carrier wave, and the carrier wave outputs a high sound pressure that generates the "nonlinear phenomenon (parameterization effect) of an acoustic wave", realizes narrow-range detection based on ultrasonic directivity, and also realizes further distance detection than a general ultrasonic sensor.
Fig. 9 is a schematic diagram of the occurrence of self-demodulation waves. As shown in fig. 9, a high sound pressure modulated wave transmitted by an ultrasonic microphone mounted on a vehicle generates a self-demodulation wave of a signal wave component in the vicinity of carrier wave propagation. The generated self-demodulation wave is a component of the low-frequency signal wave, and thus can travel a longer distance than the carrier wave. Further, since the carrier wave uses a high frequency, it has a narrow directivity, and the self-demodulation wave is generated in the region where the carrier wave propagates, so that the directivity of the self-demodulation wave, that is, the signal wave can also maintain the narrow directivity.
Fig. 10 is a schematic view of the ultrasonic attenuation characteristics. As shown in fig. 10, the propagation attenuation of the acoustic wave rapidly attenuates the propagation of the sound pressure when the frequency is high, and the sound pressure slowly attenuates when the frequency is low. I.e. the lower the frequency the more can be propagated to a long distance. If the carrier wave is 58kHz and the signal wave is 20kHz, the signal wave can detect a long distance compared to the carrier wave.
Fig. 11 is a schematic diagram of detection distances of the detection system shown in fig. 5 and 7. In the present invention, since a signal wave having a low frequency is used, the signal wave can travel a longer distance than a carrier wave. Further, since the carrier frequency is higher, the carrier frequency has a narrow directivity, and the self-demodulation wave is generated in the region where the carrier propagates, so that the directivity of the self-demodulation wave, that is, the signal wave can also maintain the narrow directivity.
Still another embodiment of the present invention provides an ultrasonic detection method based on the ultrasonic Parametric detection system according to any of the above embodiments, including:
adopting ultrasonic waves with a first frequency as a carrier wave;
adopting ultrasonic waves with a second frequency as signal waves, wherein the first frequency is greater than the second frequency;
generating a modulated wave according to the signal wave and the carrier wave, amplifying the modulated wave and transmitting;
the amplified modulated wave is self-demodulated in the air through nonlinear action to obtain a self-demodulated wave;
receiving reflected waves of the self-demodulation waves reflected by an object, and amplifying and filtering the reflected waves;
and determining a distance value between the object and the ultrasonic transceiver according to the reflected wave and the modulated wave.
In one implementation, the ultrasonic detection method further includes: and outputting the distance value.
In one implementation manner, the determining a distance value between the object and the ultrasonic transceiver according to the reflected wave and the modulated wave specifically includes:
and determining a distance value between the object and the ultrasonic transceiver according to the transmitting time of the modulated wave and the receiving time of the reflected wave.
Those of ordinary skill in the art will appreciate that: the drawing is a schematic diagram of one embodiment and the modules or flows in the drawing are not necessarily required to practice the invention.
Those of ordinary skill in the art will appreciate that: the modules in the apparatus of the embodiments may be distributed in the apparatus of the embodiments according to the description of the embodiments, or may be located in one or more apparatuses different from the present embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. An ultrasonic Parametric detection system, comprising:
the carrier generation processing module is used for generating ultrasonic waves with a first frequency as a carrier;
a signal wave generation processing module for generating an ultrasonic wave of a second frequency as a signal wave, wherein the first frequency is greater than the second frequency;
a modulated wave generation circuit configured to generate a modulated wave from the signal wave and the carrier wave;
a high voltage generation circuit for amplifying the modulated wave;
the high-voltage generating circuit is also used for driving the ultrasonic wave receiving and transmitting device to transmit amplified modulated waves, the amplified modulated waves are subjected to self-demodulation in the air through nonlinear action to obtain self-demodulation waves, and the ultrasonic wave receiving and transmitting device is also used for receiving reflected waves of the self-demodulation waves reflected by an object;
the filtering amplification circuit is used for amplifying and filtering the reflected wave;
and the CPU processing unit comprises a distance judging module which is used for determining a distance value between the object and the ultrasonic transceiver according to the reflected wave and the modulated wave.
2. The ultrasonic Parametric detection system of claim 1, wherein the CPU processing unit further comprises a distance output module for outputting the distance value.
3. The ultrasonic Parametric detection system according to claim 1, wherein the ultrasonic transceiver device comprises a transmit microphone that includes a transmit carrier band and a receive microphone that is capable of receiving a signal wave band.
4. The ultrasonic Parametric detection system of claim 1, comprising: the modulation wave generation circuit is used for modulating the signal wave onto the carrier wave to obtain the modulation wave.
5. The ultrasonic Parametric detection system of claim 3, wherein the transmit microphone and the receive microphone are of an integrated design.
6. The ultrasonic Parametric detection system according to claim 1, wherein the distance determination module is configured to determine a distance value between the object and the ultrasonic transceiver based on a time of transmission of the modulated wave and a time of receipt of the reflected wave.
7. The ultrasonic Parametric detection system according to claim 1, wherein the CPU processing unit further comprises a time management module for transmitting signals to the carrier generation processing module and the signal wave generation processing module, respectively, to cause the carrier generation processing module to generate ultrasonic waves of a first frequency as a carrier wave and the signal wave generation processing module to generate ultrasonic waves of a second frequency as a signal wave.
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