CN113777595B - Ultrasonic wave receiving circuit - Google Patents
Ultrasonic wave receiving circuit Download PDFInfo
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- CN113777595B CN113777595B CN202111072307.9A CN202111072307A CN113777595B CN 113777595 B CN113777595 B CN 113777595B CN 202111072307 A CN202111072307 A CN 202111072307A CN 113777595 B CN113777595 B CN 113777595B
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The present invention relates to an ultrasonic wave receiving circuit, comprising: a filter amplifying circuit, a rectifying circuit and a waveform converting circuit; the filtering and amplifying circuit is used for receiving the ultrasonic echo signals, filtering and amplifying the ultrasonic echo signals to generate filtered and amplified ultrasonic echo signals; the rectification circuit is used for rectifying the filtered and amplified ultrasonic echo signals to generate spike ultrasonic echo signals; and the waveform conversion circuit is used for converting the spike ultrasonic echo signal into a square pulse signal and transmitting the square pulse signal to the ultrasonic acquisition device. The invention filters, amplifies and rectifies the ultrasonic echo signal by utilizing the filtering amplifying circuit, the rectifying circuit and the waveform converting circuit, converts the ultrasonic echo signal into square pulse signal, and transmits the square pulse signal to the ultrasonic collecting device, so that the original ultrasonic echo signal can be converted into square pulse signal which is convenient to be identified and captured by the ultrasonic collecting device, and the sensitivity of the ultrasonic receiving and transmitting system is greatly improved.
Description
Technical Field
The invention relates to the technical field of ultrasonic waves, in particular to an ultrasonic wave receiving circuit.
Background
In an ultrasonic transceiver system, an ultrasonic probe receives ultrasonic waves (mechanical vibration waves) and converts them into electric signals by using the piezoelectric effect of a piezoelectric material. When the dielectric is deformed by external force in a certain direction, polarization phenomenon occurs in the dielectric, and opposite charges are generated on two opposite surfaces of the dielectric. Most of the ultrasonic transceiver systems currently on the market are constructed based on piezoelectric materials, and the energy of the reflected echo is very small, so that the converted alternating current signal is very weak, usually in the milliamp level, which is not beneficial to subsequent processing equipment to judge whether the echo exists. Therefore, the conventional ultrasonic transmission/reception system has a disadvantage of low echo receiving sensitivity. In addition, the existing ultrasonic receiving circuit is too redundant and complex, the product developed according to the ultrasonic receiving circuit is oversized and overweight, and the actual use process is very inconvenient.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an ultrasonic receiving circuit so as to improve the sensitivity of an ultrasonic receiving and transmitting system.
In order to achieve the above object, the present invention provides the following solutions:
an ultrasonic wave receiving circuit comprising:
the filtering and amplifying circuit is used for receiving the ultrasonic echo signals, filtering and amplifying the ultrasonic echo signals to generate filtered and amplified ultrasonic echo signals;
the rectification circuit is connected with the filtering and amplifying circuit and is used for rectifying the filtered and amplified ultrasonic echo signals to generate spike ultrasonic echo signals;
the waveform conversion circuit is respectively connected with the rectification circuit and the ultrasonic acquisition device and is used for converting the spike ultrasonic echo signal into a square pulse signal and transmitting the square pulse signal to the ultrasonic acquisition device.
Preferably, the filter amplifying circuit includes:
the first-order filtering and amplifying circuit is connected with the ultrasonic probe through the aviation plug and is used for receiving ultrasonic echo signals and carrying out first-order filtering and amplifying on the ultrasonic echo signals to generate first-order filtering and amplifying ultrasonic echo signals;
the second-order filter amplification circuit is connected with the first-order filter amplification circuit and is used for carrying out second-order filter amplification on the ultrasonic echo signal subjected to the first-order filter amplification to generate a second-order filter amplified ultrasonic echo signal;
and the third-order filtering and amplifying circuit is connected with the second-order filtering and amplifying circuit and is used for performing third-order filtering and amplifying on the ultrasonic echo signals after the second-order filtering and amplifying to generate the ultrasonic echo signals after the filtering and amplifying.
Preferably, the first-order filter amplification circuit includes: the first capacitor, the fifth capacitor, the sixth capacitor, the first resistor, the second resistor, the first adjustable resistor and the current feedback amplifier;
the second pin of the current feedback amplifier is respectively connected with one end of the second resistor and one end of the first adjustable resistor, the third pin of the current feedback amplifier is respectively connected with one end of the first capacitor and one end of the first resistor, the fourth pin of the current feedback amplifier is connected with one end of the fifth capacitor, the sixth pin of the current feedback amplifier is connected with the other end of the first adjustable resistor, and the seventh pin of the current feedback amplifier is connected with one end of the sixth capacitor;
the other end of the first resistor, the other end of the second resistor, the other end of the fifth capacitor and the other end of the sixth capacitor are grounded;
the other end of the first capacitor is connected with the aviation plug.
Preferably, the current feedback amplifier is of the type AD811.
Preferably, the rectifying circuit includes: a fourth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a seventh resistor, a second adjustable resistor, a third adjustable resistor, a first diode, a second diode and a feedback amplifier;
the second pin of the feedback amplifier is respectively connected with one end of the seventh resistor, one end of the second adjustable resistor and the anode of the first diode, the third pin of the feedback amplifier is grounded, the fourth pin of the feedback amplifier is connected with one end of the eleventh capacitor, the sixth pin of the feedback amplifier is respectively connected with the cathode of the first diode and the anode of the second diode, and the seventh pin of the feedback amplifier is connected with one end of the twelfth capacitor;
one end of the fourth capacitor is connected with the output end of the filter amplifying circuit, and the other end of the fourth capacitor is connected with the other end of the seventh resistor;
the cathode of the second diode, one end of the thirteenth capacitor and one end of the third adjustable resistor are all connected with the other end of the second adjustable resistor;
the other end of the eleventh capacitor, the other end of the twelfth capacitor, one end of the thirteenth capacitor and the other end of the third adjustable resistor are grounded.
Preferably, the feedback amplifier is of model LM7171.
Preferably, the waveform conversion circuit includes: the device comprises a monostable trigger, a fourteenth capacitor, a fourth adjustable resistor, a fifth adjustable resistor and a voltage stabilizing tube;
a fifth pin of the monostable trigger is connected with the output end of the rectifying circuit, a third pin, a fourth pin and a seventh pin of the monostable trigger are all grounded, a sixth pin of the monostable trigger is connected with one end of the fifth adjustable resistor, a ninth pin of the monostable trigger is connected with one end of the fourth adjustable resistor, a tenth pin of the monostable trigger is connected with one end of the fourteenth capacitor, an eleventh pin of the monostable trigger is connected with the other end of the fourteenth capacitor, and a fourteenth pin of the monostable trigger is connected with the other end of the fourth adjustable resistor;
the other end of the fifth adjustable resistor is connected with one end of the voltage stabilizing tube, and the other end of the voltage stabilizing tube is grounded.
Preferably, the monostable trigger is 74121.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides an ultrasonic wave receiving circuit, which can be known from the scheme, the invention filters, amplifies and rectifies an ultrasonic wave echo signal by utilizing a filtering amplifying circuit, a rectifying circuit and a waveform conversion circuit, converts the ultrasonic wave echo signal into a square pulse signal, and transmits the square pulse signal to an ultrasonic wave acquisition device, so that the original ultrasonic wave echo signal can be converted into the square pulse signal which is conveniently identified and captured by the ultrasonic wave acquisition device, and the sensitivity of an ultrasonic wave receiving and transmitting system is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present 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 circuit diagram of an ultrasonic receiving circuit according to an embodiment of the present invention.
Fig. 2 is a first-order filter amplifying circuit diagram in an embodiment provided by the invention.
Fig. 3 is a rectifying circuit diagram in an embodiment provided by the invention.
Fig. 4 is a waveform conversion circuit diagram in an embodiment provided by the invention.
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 making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an ultrasonic receiving circuit for improving the sensitivity of an ultrasonic receiving and transmitting system.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Fig. 1 is a circuit diagram of an ultrasonic receiving circuit according to an embodiment of the present invention, as shown in fig. 1, an ultrasonic receiving circuit includes: a filter amplifying circuit, a rectifying circuit and a waveform converting circuit. The filtering and amplifying circuit is used for receiving the ultrasonic echo signals, filtering and amplifying the ultrasonic echo signals to generate filtered and amplified ultrasonic echo signals; the rectification circuit is connected with the filtering and amplifying circuit and is used for rectifying the filtered and amplified ultrasonic echo signals to generate spike ultrasonic echo signals; the waveform conversion circuit is respectively connected with the rectification circuit and the ultrasonic acquisition device and is used for converting the spike ultrasonic echo signal into a square pulse signal and transmitting the square pulse signal to the ultrasonic acquisition device.
The ultrasonic receiving circuit in the invention mainly comprises three parts: the first is a filter amplifying circuit, the second is a rectifying circuit, and the third is a waveform conversion circuit.
1. And the filtering and amplifying circuit is used for carrying out multi-order filtering and amplifying on the received weak echo signals and outputting attenuation oscillation modes which can be identified by the acquisition device and have no clutter interference. The filter amplifying circuit is as follows:
the aviation plug receiver is connected with the 3 rd pin of the AD811 chip U6 after being connected with the capacitor C1 in series, and is grounded through the resistor R1; the 2 nd pin of the AD811 chip U6 is connected with the resistor R2; the No. 2 pin of the AD811 chip U6 is connected with the adjustable resistor First and then connected with the capacitor C2 and then connected to the No. 3 pin of the AD811 chip U7; the 6 th pin of the AD811 chip U6 is connected with the capacitor C2 and then connected to the 3 rd pin of the AD811 chip U7, and is grounded through the resistor R3; the 4 th pin of the AD811 chip U6 is connected with the ground through a capacitor C5; the 7 th pin of the AD811 chip U6 is connected with the ground through a capacitor C6.
The 2 nd pin of the AD811 chip U7 is connected with the resistor R4; the 2 nd pin of the AD811 chip U7 is connected with the adjustable resistor Second and then connected with the capacitor C3, and then connected to the 3 rd pin of the AD811 chip U8; the 6 th pin of the AD811 chip U7 is connected with the capacitor C3 and then connected to the 3 rd pin of the AD811 chip U8, and is grounded through the resistor R5; the pin No. 4 of the AD811 chip U7 is connected with the ground through a capacitor C7; pin 7 of the AD811 chip U7 is connected with the ground through a capacitor C8.
The 2 nd pin of the AD811 chip U8 is connected with the resistor R6; the AD811 chip U8 pin 2 is connected with the adjustable resistor Third, then connected with the 6 pin, the capacitor C4 and the resistor R7, and then connected to the LM7171 chip pin 2; the 4 th pin of the AD811 chip U8 is connected with the ground through a capacitor C9; the 7 th pin of the AD811 chip U8 is connected with the ground through a capacitor C10.
2. A rectifying circuit: the negative voltage is eliminated, and the input signal is adjusted to spike, and the value of the sliding rheostat is changed to adjust the output amplitude. The rectifying circuit is as follows:
the No. 2 pin of the LM7171 chip U9 is connected with the anode of the diode D1 and then is connected with the anode of the diode D2, and is connected with the No. 5 pin of the 74121 chip U10 through an adjustable resistor RP 7171; after the No. 6 pin of the LM7171 chip U9 is connected with the anode of the diode D2, the adjustable resistor RP is connected with the No. 5 pin of the 74121 chip U10 through the capacitor C13; the capacitor C11 of the 4 th pin of the LM7171 chip U9 is connected with the ground; the LM7171 chip U9 pin 7 capacitor C12 is connected with the ground.
3. And the waveform conversion circuit takes the rectified signal as a trigger pulse, and generates standard square pulse with a certain pulse width by utilizing a multivibrator, so that the standard square pulse is conveniently identified and captured by the acquisition device. Wherein the waveform conversion circuit is as follows:
pins 3, 4 and 7 of the 74121 chip U10 are connected and then grounded; the 10 th pin of the 74121 chip U10 is connected with the capacitor C14 and then connected with the 11 th pin; the 14 th pin of the 74121 chip U10 is connected with the 9 th pin through an adjustable resistor RP 6; the 6 th pin of the 74121 chip U10 is connected with the adjustable resistor RP3V 3.
The ultrasonic wave receiving circuit of the present invention is further described below with reference to specific examples:
the filter amplifier circuit of the present invention includes: a first-order filter amplifying circuit, a second-order filter amplifying circuit and a third-order filter amplifying circuit.
The first-order filtering and amplifying circuit is connected with the ultrasonic probe through the aviation plug and is used for receiving ultrasonic echo signals and carrying out first-order filtering and amplifying on the ultrasonic echo signals to generate first-order filtering and amplifying ultrasonic echo signals; the second-order filter amplification circuit is connected with the first-order filter amplification circuit and is used for carrying out second-order filter amplification on the ultrasonic echo signal subjected to the first-order filter amplification to generate a second-order filter amplified ultrasonic echo signal; and the third-order filtering and amplifying circuit is connected with the second-order filtering and amplifying circuit and is used for performing third-order filtering and amplifying on the ultrasonic echo signals after the second-order filtering and amplifying to generate the ultrasonic echo signals after the filtering and amplifying.
In the invention, after the ultrasonic echo signal is processed by the first-order filtering amplifying circuit, the very weak interference signal which is not filtered can be amplified, and the interference signal can be found and eliminated by the second-order and third-order filtering circuits. The invention adopts three filter amplifying circuits to be arranged in a crossing way, can amplify the ultrasonic echo signals to 2-3V, and simultaneously filters the interference signals, so that the interference signals can not influence the subsequent signal processing.
Fig. 2 is a first-order filter amplifying circuit diagram in an embodiment of the invention. As shown in fig. 2, the first-order filter amplification circuit includes: the First capacitor C1, the fifth capacitor C5, the sixth capacitor C6, the First resistor R1, the second resistor R2, the First adjustable resistor First and the current feedback amplifier;
the second pin of the current feedback amplifier is respectively connected with the second resistor R2 and one end of the First adjustable resistor First, the third pin of the current feedback amplifier is respectively connected with the First capacitor C1 and one end of the First resistor R1, the fourth pin of the current feedback amplifier is connected with one end of the fifth capacitor C5, the sixth pin of the current feedback amplifier is connected with the other end of the First adjustable resistor First, and the seventh pin of the current feedback amplifier is connected with one end of the sixth capacitor C6; the other end of the first resistor R1, the other end of the second resistor R2, the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6 are grounded; the other end of the first capacitor C1 is connected with the aviation plug. The current feedback amplifier in the present invention is model AD811. The fourth pin and the seventh pin of the AD811 chip are used for being connected with a power supply module for supplying power.
In the embodiment of the present invention, the first capacitor C1 and the first resistor R1 form a high-pass filter circuit. The AD811 chip U6, the second resistor R2, the fifth capacitor C5, the sixth capacitor C6 and the First adjustable resistor First form a gain amplifying circuit. The invention can reduce noise and amplify the ultrasonic signal through the high-pass filter circuit and the gain amplifying circuit, and can highlight the characteristic waveform in the ultrasonic signal. The principle of the first-order filter amplifying circuit in the invention is as follows:
the aviation plug receiver is connected with the ultrasonic probe to receive ultrasonic echo signals, the ultrasonic echo signals firstly enter a high-pass filter circuit formed by a capacitor C1 and a resistor R1 to be filtered, low-frequency noise signal interference in the signals is removed, then the signals enter an AD811 chip U6 to be amplified in a gain mode, the R2 resistor is used for adjusting the amplification gain of the AD811 chip, the adjustable resistor First is used for adjusting the amplification bandwidth of the AD811 chip, and the adjusted signals are output to a next-stage filter amplifying circuit from a 6 th pin of the AD811 chip U6. The capacitors C6 and C5 in the invention play a role in stabilizing voltage.
It should be noted that the structures and principles of the second-order filter amplifying circuit and the third-order filter amplifying circuit in the present invention are the same as those of the first-order filter amplifying circuit in the present invention, so that the description thereof will not be repeated.
Fig. 3 is a rectifying circuit diagram in an embodiment of the invention. As shown in fig. 3, the rectifying circuit includes: a fourth capacitor C4, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a seventh resistor R7, a second adjustable resistor RP7171, a third adjustable resistor RP-output, a first diode D1, a second diode D2, and a feedback amplifier;
the second pin of the feedback amplifier is respectively connected with one end of the seventh resistor R7, one end of the second adjustable resistor RP7171 and the anode of the first diode D1, the third pin of the feedback amplifier is grounded, the fourth pin of the feedback amplifier is connected with one end of the eleventh capacitor C11, the sixth pin of the feedback amplifier is respectively connected with the cathode of the first diode D1 and the anode of the second diode D2, and the seventh pin of the feedback amplifier is connected with one end of the twelfth capacitor C12; one end of the fourth capacitor C4 is connected with the output end of the filtering and amplifying circuit, and the other end of the fourth capacitor C4 is connected with the other end of the seventh resistor R7; the cathode of the second diode D2, one end of the thirteenth capacitor C13, and one end of the third adjustable resistor RP-output are all connected to the other end of the second adjustable resistor RP 7171; the other end of the eleventh capacitor C11, the other end of the twelfth capacitor C12, one end of the thirteenth capacitor C13, and the other end of the third adjustable resistor RP-output are all grounded. In the present invention, the model of the feedback amplifier is LM7171.
The principle of the rectifying circuit according to the present invention will be described with reference to fig. 3:
the capacitor C4, the resistor R7, the LM7171 chip U9, the capacitor C11, the capacitor C12, the adjustable resistor RP7171, the capacitor C13 and the adjustable resistor RP-output form a half-wave rectifying circuit, the series connection of the capacitor C4 and the resistor R7 aims at attenuating a low-frequency signal, which is equivalent to further removing the interference of the low-frequency signal, and then the low-frequency signal enters the 2 nd pin of the feedback amplifier LM7171 chip, when an input signal is positive, the D1 is turned on, the D2 is turned off, the circuit is equivalent to a voltage follower, and the output is equal to the input; when the input signal is negative, D1 is turned off, D2 is turned on, the circuit is equivalent to an inverter, the signal is inverted to be output, the signal with the voltage below 0v is removed, only the positive voltage signal is reserved, the subsequent processing is convenient, the resistor RP7171 is used for adjusting the gain of the LM7171, the resistor C13 is connected with the adjustable resistor RP-output in parallel, the low-frequency signal is difficult to pass, the high-frequency signal is easy to pass, and the low-frequency noise in the signal is further filtered.
The invention can achieve further adjustment of the amplified signal by utilizing LM7171 and an adjustable resistor in the peripheral circuit. After passing through LM7171, the negative voltage below 0V is removed, and the gain is changed by adjusting RP4, RP5 being used for current limiting. The purpose of this process is to adjust the amplitude to the proper state so that the received signal reaches the triggering requirement of waveform transformation. The minimum requirement of the common mode rejection ratio of the voltage feedback amplifier selected by the invention is 80dB, and the maximum value of the output current is 100mA. And D1 and D2 are preferably rectifier diodes, model 1N4148.
Fig. 4 is a waveform conversion circuit diagram in an embodiment provided by the invention. As shown in fig. 4, in an embodiment of the present invention, the waveform conversion circuit includes: the monostable trigger, a fourteenth capacitor C14, a fourth adjustable resistor RP6, a fifth adjustable resistor RP3V3 and a voltage stabilizing tube D3;
a fifth pin of the monostable trigger is connected with the output end of the rectifying circuit, a third pin, a fourth pin and a seventh pin of the monostable trigger are all grounded, a sixth pin of the monostable trigger is connected with one end of the fifth adjustable resistor RP3V3, a ninth pin of the monostable trigger is connected with one end of the fourth adjustable resistor RP6, a tenth pin of the monostable trigger is connected with one end of the fourteenth capacitor C14, an eleventh pin of the monostable trigger is connected with the other end of the fourteenth capacitor C14, and a fourteenth pin of the monostable trigger is connected with the other end of the fourth adjustable resistor RP 6; the other end of the fifth adjustable resistor RP3V3 is connected with one end of the voltage stabilizing tube D3, and the other end of the voltage stabilizing tube D3 is grounded.
The principle of the waveform conversion circuit of the present invention will be described with reference to fig. 4 of the present invention:
74121 chip U10, electric capacity C10, adjustable resistance RP6, adjustable resistance 3v3, stable voltage tube D3 constitute monostable trigger circuit. The signal processed by the rectifying circuit enters a 5 th pin of a 74121 chip, when the 74121 chip detects that an input signal has a rising edge, a trigger signal is generated, a standard square wave pulse signal is output, the subsequent processing is facilitated, the width of the signal is determined by RP6 and a capacitor C14 (the pulse width=0.7RC of the 74121 output signal can be ensured by adjusting the resistance value of Rp 6), the pulse signal is output from a 6 th pin of the 74121 chip, the voltage is limited to be about 3.3v after being limited by a resistor RP3v3, and then the voltage is regulated by a voltage regulator D3. Furthermore, the waveform conversion circuit of the present invention also has a filtering function, because the 74121 input rising edge level reaches about 3v to trigger, only the voltage of the characteristic signal (useful signal) can reach the level after the previous filtering and gain amplification, and the voltage of the interference signal cannot reach the level requirement.
The waveform conversion circuit comprises an oscillator output part and a limiting part. The rectified spike ultrasonic echo signal is connected with the input end of the 74121 chip, and when the rising edge is detected, the 74121 chip immediately outputs a square pulse signal, so that the subsequent processing is facilitated. The invention can adjust the pulse width by changing the values of the slide varistors RP6 and C14, so that the signal can be stably captured without changing the normal triggering of the echo signal of the next stage. RP3v3, D3 is used for clipping. The invention can adjust the value of RP3v3 to change the amplitude of the output signal, thereby ensuring that the acquisition equipment is not damaged due to the excessively high amplitude. The monostable trigger of the invention is preferably 74121, the propagation delay time is 80ns, the working temperature is 0-70 ℃, the low-level output current is 16mA, and the supply voltage is 4.75V-5.25V. The resistance of R1, R2 and R7 in the invention is 330 ohm, 68 ohm and 330 ohm respectively.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides an ultrasonic wave receiving circuit, which can be known from the scheme, the invention filters, amplifies and rectifies an ultrasonic wave echo signal by utilizing a filtering amplifying circuit, a rectifying circuit and a waveform conversion circuit, converts the ultrasonic wave echo signal into a square pulse signal, and transmits the square pulse signal to an ultrasonic wave acquisition device, so that the original ultrasonic wave echo signal can be converted into the square pulse signal which is conveniently identified and captured by the ultrasonic wave acquisition device, and the sensitivity of an ultrasonic wave receiving and transmitting system is greatly improved. The circuit has the advantages of simple structure, small size and low weight, and realizes miniaturization and light weight of the application process of the receiving circuit.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. An ultrasonic wave receiving circuit, comprising:
the filtering and amplifying circuit is used for receiving the ultrasonic echo signals, filtering and amplifying the ultrasonic echo signals to generate filtered and amplified ultrasonic echo signals;
the rectification circuit is connected with the filtering and amplifying circuit and is used for rectifying the filtered and amplified ultrasonic echo signals to generate spike ultrasonic echo signals;
the waveform conversion circuit is respectively connected with the rectification circuit and the ultrasonic acquisition device and is used for converting the spike ultrasonic echo signal into a square pulse signal and transmitting the square pulse signal to the ultrasonic acquisition device;
the rectifying circuit includes: a fourth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a seventh resistor, a second adjustable resistor, a third adjustable resistor, a first diode, a second diode and a feedback amplifier;
the second pin of the feedback amplifier is respectively connected with one end of the seventh resistor, one end of the second adjustable resistor and the anode of the first diode, the third pin of the feedback amplifier is grounded, the fourth pin of the feedback amplifier is connected with one end of the eleventh capacitor, the sixth pin of the feedback amplifier is respectively connected with the cathode of the first diode and the anode of the second diode, and the seventh pin of the feedback amplifier is connected with one end of the twelfth capacitor;
one end of the fourth capacitor is connected with the output end of the filter amplifying circuit, and the other end of the fourth capacitor is connected with the other end of the seventh resistor;
the cathode of the second diode, one end of the thirteenth capacitor and one end of the third adjustable resistor are all connected with the other end of the second adjustable resistor;
the other end of the eleventh capacitor, the other end of the twelfth capacitor, one end of the thirteenth capacitor and the other end of the third adjustable resistor are grounded.
2. The ultrasonic wave receiving circuit according to claim 1, wherein the filter amplifying circuit comprises:
the first-order filtering and amplifying circuit is connected with the ultrasonic probe through the aviation plug and is used for receiving ultrasonic echo signals and carrying out first-order filtering and amplifying on the ultrasonic echo signals to generate first-order filtering and amplifying ultrasonic echo signals;
the second-order filter amplification circuit is connected with the first-order filter amplification circuit and is used for carrying out second-order filter amplification on the ultrasonic echo signal subjected to the first-order filter amplification to generate a second-order filter amplified ultrasonic echo signal;
and the third-order filtering and amplifying circuit is connected with the second-order filtering and amplifying circuit and is used for performing third-order filtering and amplifying on the ultrasonic echo signals after the second-order filtering and amplifying to generate the ultrasonic echo signals after the filtering and amplifying.
3. An ultrasonic wave receiving circuit according to claim 2, wherein the first-order filter amplifying circuit comprises: the first capacitor, the fifth capacitor, the sixth capacitor, the first resistor, the second resistor, the first adjustable resistor and the current feedback amplifier;
the second pin of the current feedback amplifier is respectively connected with one end of the second resistor and one end of the first adjustable resistor, the third pin of the current feedback amplifier is respectively connected with one end of the first capacitor and one end of the first resistor, the fourth pin of the current feedback amplifier is connected with one end of the fifth capacitor, the sixth pin of the current feedback amplifier is connected with the other end of the first adjustable resistor, and the seventh pin of the current feedback amplifier is connected with one end of the sixth capacitor;
the other end of the first resistor, the other end of the second resistor, the other end of the fifth capacitor and the other end of the sixth capacitor are grounded;
the other end of the first capacitor is connected with the aviation plug.
4. An ultrasonic wave receiving circuit according to claim 3, wherein the current feedback amplifier is of the type AD811.
5. An ultrasonic wave receiving circuit according to claim 1, wherein the feedback amplifier is model LM7171.
6. The ultrasonic wave receiving circuit according to claim 1, wherein the waveform converting circuit comprises: the device comprises a monostable trigger, a fourteenth capacitor, a fourth adjustable resistor, a fifth adjustable resistor and a voltage stabilizing tube;
a fifth pin of the monostable trigger is connected with the output end of the rectifying circuit, a third pin, a fourth pin and a seventh pin of the monostable trigger are all grounded, a sixth pin of the monostable trigger is connected with one end of the fifth adjustable resistor, a ninth pin of the monostable trigger is connected with one end of the fourth adjustable resistor, a tenth pin of the monostable trigger is connected with one end of the fourteenth capacitor, an eleventh pin of the monostable trigger is connected with the other end of the fourteenth capacitor, and a fourteenth pin of the monostable trigger is connected with the other end of the fourth adjustable resistor;
the other end of the fifth adjustable resistor is connected with one end of the voltage stabilizing tube, and the other end of the voltage stabilizing tube is grounded.
7. The ultrasonic wave receiving circuit of claim 6, wherein the monostable trigger is 74121.
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Application publication date: 20211210 Assignee: TIANJIN JIETAI GAOKE SENSING TECHNOLOGY CO.,LTD. Assignor: TIANJIN University OF TECHNOLOGY Contract record no.: X2024980003287 Denomination of invention: An ultrasonic receiving circuit Granted publication date: 20230811 License type: Common License Record date: 20240321 |