CN111726089A - A medium frequency ultrasonic signal processing application system received by transducer - Google Patents

Abstract

The invention provides an intermediate frequency ultrasonic signal processing application system received by a transducer, comprising: a signal sampling circuit, a first-level signal amplifying circuit, a second-level signal band-pass filtering and amplifying circuit, a three-level signal band-pass filtering and amplifying circuit, and a fourth-level signal bandpass filtering and amplifying circuit. RF power detection circuit; the output end of the signal sampling circuit is connected to the input end of the first-level signal amplifying circuit; the output end of the first-level signal amplifying circuit is connected to the input end of the second-level signal band-pass filter amplifying circuit The output end of the two-stage signal band-pass filter amplifying circuit is connected to the input end of the three-stage signal band-pass filter amplifying circuit; the output end of the three-stage signal band-pass filter amplifying circuit is connected to the four-stage RF power detection circuit The signal processing circuit of the present invention does not need professional signal processing knowledge, that is, analog-to-digital conversion and effective reading of signals can be realized, which greatly reduces the difficulty of signal processing.

Description

A medium frequency ultrasonic signal processing application system received by transducer

technical field

The invention relates to the field of ultrasonic waves, in particular to an application system for processing intermediate frequency ultrasonic signals received by a transducer, and more particularly, to an application circuit for ultrasonic reflection signals.

Background technique

Most of the existing technologies use ADC chips with large bandwidth, high precision, and ultra-high-speed sampling to process signals. The peripheral circuits of high-performance ADC chips are also relatively complex. are more demanding. At the same time, the high-performance ADC will sample and read all the signals processed by the above four steps, which will generate a large amount of data (which still contains some clutter signals), and these data need to be transformed by Fourier transform. The signal is converted from the frequency domain to the time domain, and then the envelope of the signal is extracted for effective processing. Therefore, it is difficult for ordinary MCUs to meet the data processing requirements of this magnitude, and high-performance MCUs (including Fourier transform modules) are required. Or FPGA to process a large amount of data in order to get effective data.

In the prior art, high-performance AD chips are used to sample ultrasonic reflection signals (the application number is CN201910277023.X, which discloses an ultrasonic detection circuit with an analog-to-digital conversion function). The analog signal is filtered and amplified, and then the analog signal of ultrasonic detection is converted into digital signal of ultrasonic detection through the analog-to-digital conversion module and then output. However, this circuit has higher requirements for AD chips, the circuit is more complicated, and the sampling frequency of ultrasonic signals is also limited.

SUMMARY OF THE INVENTION

In view of the defects in the prior art, the purpose of the present invention is to provide an intermediate frequency ultrasonic signal processing application system received by a transducer.

According to an application system of intermediate frequency ultrasonic signal processing received by a transducer provided by the present invention, the system includes:

Signal sampling circuit, first-level signal amplifying circuit, second-level signal band-pass filtering and amplifying circuit, three-level signal band-pass filtering and amplifying circuit and four-level RF power detection circuit;

The output end of the signal sampling circuit is connected to the input end of the first-stage signal amplifying circuit;

The output end of the first-level signal amplifying circuit is connected with the input end of the second-level signal bandpass filtering and amplifying circuit;

The output end of the second-stage signal band-pass filtering and amplifying circuit is connected with the input end of the third-stage signal band-pass filtering and amplifying circuit;

The output end of the three-stage signal bandpass filtering and amplifying circuit is connected to the four-stage RF power detection circuit;

The signal sampling circuit is a primary detection circuit, including a capacitor, a resistor and a high-voltage switch diode, and outputs the original signal completely;

The first-level signal amplifying circuit includes a differential amplifying circuit and an inverting amplifying circuit, and the first-level signal amplifying circuit amplifies and maintains the original signal in equal proportion within the linear range of the amplifier operation;

The second-level signal band-pass filter amplifying circuit includes a band-pass filter amplifying circuit, which can effectively filter the clutter signal amplified by the first-level signal amplifying circuit and retain the effective signal;

The three-stage signal bandpass filtering and amplifying circuit can further filter the clutter signal and amplify the effective signal;

The four-stage RF power detection circuit is composed of a special RF detector and a peripheral circuit. The amplified and filtered effective signal is converted into the frequency domain and the time domain through the detection circuit, and the envelope is efficiently read through the analog-to-digital conversion device. Signal.

Preferably, the signal sampling circuit includes: the ultrasonic signal is connected to one end of the capacitor C80 via the SONAR_A input end; the ultrasonic signal is connected to one end of the capacitor C86 via the SONAR_B input end, and the other end of the capacitor C80 is connected to the positive electrode of the first diode in the half bridge D12, The cathode of the second diode in the half-bridge D12, one end of the capacitor C84 and one end of the resistor R47; the cathode of the first diode in the half-bridge D12 is connected to the anode of the second diode and the ground; the other end of the capacitor C84 One end of the resistor R3 is connected to the input end of the first-stage signal amplifying circuit; the other end of the resistor R3 is grounded and one end of the link resistor R4; the other end of the resistor R4 is connected to the other input end of the first-stage signal amplifying circuit and the capacitor C85. One end, the other end of the capacitor C85 is connected to the other end of the resistor R47, the other end of the capacitor C86 and the anode of the first diode in the half-bridge D13; the cathode of the first diode in the half-bridge D13 is connected to the second diode The anode and ground; the cathode of the second diode in the half-bridge D13 is connected to the other end of the capacitor C86.

Preferably, the first-stage signal amplifying circuit includes: the other end of the capacitor C84 is connected to the input end of the first-stage signal amplifying circuit, the input end of the first-stage signal amplifying circuit is connected to one end of the resistor R45, and the other end of the resistor R45 is connected to the input end of the amplifier U8A. The second pin, one end of resistor R33 and one end of capacitor C74; the other end of capacitor C74 is connected to the first pin of amplifier U8A, the other end of resistor R33 and one end of resistor R44; the other end of resistor R44 is connected to the sixth pin of amplifier U8B pin, one end of the resistor R32 and one end of the capacitor C73; the other end of the capacitor C73 is connected to the other end of the resistor R32, the seventh pin of the amplifier U8B and the input end of the secondary signal bandpass filter amplifying circuit; the fifth pin of the amplifier U8B Ground; the other end of the capacitor C85 is connected to the other input end of the first-level signal amplifying circuit, and the other input end of the first-level signal amplifying circuit is connected to the resistor R48; the other end of the resistor R48 is connected to the third pin of the amplifier U8A and the resistor R51. One end and one end of capacitor C89; the other end of capacitor C89 is grounded and connected to the other end of resistor R51; the fourth pin of amplifier U8A is connected to negative 5V power supply, one end of capacitor C91 and one end of capacitor C92; the other end of capacitor C91 is grounded; The other end of the capacitor C92 is grounded; the eighth pin of the amplifier U8A is connected to the positive 5V power supply, one end of the capacitor C93 and one end of the capacitor C94; the other end of the capacitor C93 is grounded, and the other end of the capacitor C94 is grounded.

Preferably, the second-level signal band-pass filtering and amplifying circuit includes: the seventh pin of the amplifier U8B is connected to the input end of the second-level signal band-pass filtering and amplifying circuit, and the input end of the second-level signal band-pass filtering and amplifying circuit is connected to the input end of the resistor R35. One end, the other end of resistor R35 is connected to one end of resistor R42, one end of capacitor C81 and one end of capacitor C75; the other end of resistor R42 is grounded, and the other end of capacitor C75 is connected to one end of resistor R28 and the first pin of amplifier U7A, resistor R28 The other end of the amplifier U7A is connected to the second pin of the amplifier U7A and the other end of the capacitor C81, the third pin of the amplifier U7A is grounded; the eighth pin of the amplifier U7A is connected to the positive 5V power supply, one end of the capacitor C99 and one end of the capacitor C100; the capacitor The other end of C99 is grounded; the other end of capacitor C100 is grounded; the fourth pin of amplifier U7A is connected to the negative 5V power supply, one end of capacitor C97 and one end of capacitor C98; the other end of capacitor C97 is grounded, the other end of capacitor C98 is grounded, and the The first pin is connected to the input end of the three-stage signal band-pass filtering and amplifying circuit.

Preferably, the three-stage signal bandpass filtering and amplifying circuit includes: the first pin of the amplifier U7A is connected to the input end of the three-stage signal bandpass filtering and amplifying circuit, and the input end of the three-stage signal bandpass filtering and amplifying circuit is connected to the input end of the resistor R36. One end, the other end of resistor R36 is connected to one end of resistor R43, one end of capacitor C76 and one end of capacitor C82, the other end of resistor R43 is connected to ground, the other end of capacitor C76 is connected to one end of resistor R29 and the seventh pin of amplifier U7B, capacitor C82 The other end of the resistor R29 is connected to the sixth pin of the amplifier U7B, the fifth pin of the amplifier U7B is grounded, and the seventh pin of the amplifier U7B is connected to the input end of the four-stage RF power detection circuit.

Preferably, the four-stage RF power detection circuit includes: the seventh pin of the amplifier U7B is connected to the input end of the four-stage RF power detection circuit, the input end of the four-stage RF power detection circuit is connected to one end of the resistor R39, and the other end of the resistor R39 One end is connected to one end of resistor R49 and one end of capacitor C83, the other end of capacitor C83 is connected to one end of resistor R50 and the eighth pin of amplifier U9, the other end of resistor R49 is connected to one end of capacitor C90 and one end of resistor R56. The other end is connected to the other end of the resistor R50 and the first pin of the amplifier U9, the other end of the resistor R56 is grounded, the second pin of the amplifier U9 is grounded, the third pin of the amplifier U9 is connected to one end of the capacitor C101, and the other end of the capacitor C101 is connected to the ground. One end is grounded, the fourth pin of amplifier U9 is connected to one end of capacitor C102, one end of resistor R57, and one end of resistor R53, the other end of capacitor C102 is grounded, the other end of resistor R57 is grounded, and the other end of resistor R53 is connected to one end of capacitor C103 and one end of capacitor C1, the other end of capacitor C103 is grounded, the other end of capacitor C1 is grounded, the seventh pin of amplifier U9 is connected to the fifth pin of amplifier U9, one end of capacitor C78, one end of capacitor C79 and one end of resistor R37 , the sixth pin of amplifier U9 is connected to one end of capacitor C77, the other end of capacitor C77 is connected to the other end of C78, the other end of capacitor C79 and ground, and the other end of resistor R37 is connected to the positive 5V power supply.

Preferably, the capacitor C1 in the four-stage RF power detection circuit judges whether the capacitor C1 is needed according to the actual debugging situation according to the capacitance in the actual circuit board, and the debugging voltage in the current circuit board reaches a preset value, then the four-stage RF power detection circuit Capacitor C1 is not required; if the debugging voltage in the current circuit board does not reach the preset value, capacitor C1 is required for the four-stage RF power detection circuit.

Preferably, the amplifier U9 is a dedicated amplifier, a logarithmic detector.

Preferably, a test point E7 is set at the connection between the resistor R57 and the resistor R53, and the test signal of the test point E7 is the valid signal after the ultrasonic wave is sampled, amplified and detected by the circuit.

Preferably, the amplifier in the signal sampling circuit works by sampling dual power supplies.

Compared with the prior art, the present invention has the following beneficial effects:

1. The signal processing circuit of the present invention uses fewer components and reduces the difficulty of design;

2. The signal processing circuit of the present invention does not need to use high-performance ADC chips, high-performance MCU and FPGA, which can greatly reduce the cost and application difficulty of signal detection;

3. The signal processing circuit of the present invention does not need to use a large number of high-performance chips, which can reduce the working power consumption of the signal processing module in practical applications and facilitate the application of portable instruments;

4. The signal processing circuit of the present invention does not require professional signal processing knowledge, which can realize analog-to-digital conversion and effective reading of signals, which greatly reduces the difficulty of signal processing;

5. The present invention uses a special signal amplifier to convert the band-pass filtered signal to the time domain through the frequency domain, so as to realize the envelope sampling of the frequency domain signal, and reduce the performance requirements of the AD chip for sampling the frequency domain signal.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

Fig. 1 is a circuit schematic diagram of an ultrasonic reflection signal system;

1-signal sampling circuit; 2-first-level signal amplifier circuit; 3-second-level signal band-pass filter amplifying circuit; 4-third-level signal band-pass filter amplifying circuit; 5-four-level RF power detection circuit.

Detailed ways

The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.

Example 1

The invention adopts the method of four-stage amplifying, filtering and sampling with dual-circuit voltage feedback amplifier and RF power detector to realize the detection of ultrasonic reflection signal.

The present invention adopts a special amplifier, that is, a logarithmic detector, for post-stage signal processing. The peripheral circuit of the special signal amplifier is simple, and the wiring requirements of the signal lines on the circuit board are not high, and the signals processed in the above four steps can be directly processed. The conversion between the domain and the time domain directly obtains the envelope of the valid signal. The converted signal can be read and sampled to obtain valid data through the ADC chip with ordinary performance or the ADC module integrated on the MCU.

According to an application system of intermediate frequency ultrasonic signal processing received by a transducer provided by the present invention, the system includes:

Signal sampling circuit, first-level signal amplifying circuit, second-level signal band-pass filtering and amplifying circuit, three-level signal band-pass filtering and amplifying circuit and four-level RF power detection circuit;

The output end of the signal sampling circuit is connected to the input end of the first-stage signal amplifying circuit;

The output end of the first-level signal amplifying circuit is connected with the input end of the second-level signal bandpass filtering and amplifying circuit;

The output end of the second-stage signal band-pass filtering and amplifying circuit is connected with the input end of the third-stage signal band-pass filtering and amplifying circuit;

The output end of the three-stage signal bandpass filtering and amplifying circuit is connected to the four-stage RF power detection circuit;

The signal sampling circuit is a primary detection circuit composed of a capacitor, a resistor and a high-voltage switch diode. In the figure, the detection circuit composed of capacitors C80, C86, C84, and C85, resistors R47, R3, R4, R45, R48 and high-voltage switching diodes D12 and D13. The primary signal detection circuit can completely output the original signal, which is convenient for the sampling and amplification of the later stage.

The first-stage signal amplifying circuit is a first-stage signal amplifying circuit composed of a differential amplifying circuit and an inverting amplifying circuit. In the figure, the amplifier U8A, resistors R45, R48, R33, R51 and capacitors C89 and C74 form a differential amplifier circuit with a gain of 50. In the figure, the amplifier U8B, resistors R44, R32 and capacitor C73 form an inverting amplifier circuit with a gain of 1. The first-stage signal amplifying circuit amplifies and maintains the original signal (including effective signal, clutter signal, etc.) in equal proportion within the linear range of amplifier operation.

The two-stage signal band-pass filtering and amplifying circuit is composed of a band-pass filtering and amplifying circuit. In the figure, amplifier U7A, capacitors C75, C81 and resistors R28, R35, R42 form the first-stage band-pass filter amplifying circuit. The characteristic index of its circuit: the amplification gain is 5.92, the bandwidth is 206.69KHz, and the center frequency is 503.04KHz. The first-stage band-pass filter amplifying circuit can effectively filter various clutter signals amplified by the first-stage signal amplifying circuit, and retain the effective signal (transduction). The center frequency of the ultrasonic wave emitted by the transmitter is 500KHz).

The three-stage signal band-pass filter amplifying circuit is the same as the previous-stage band-pass filter amplifying circuit. In the figure, the amplifier U7B, capacitors C76, C82 and resistors R29, R36, and R43 form the second-stage band-pass filter amplifying circuit. Circuit characteristics: the amplification gain is 5.92, the bandwidth is 206.69KHz, and the center frequency is 503.04KHz, which further filters the clutter signal and amplifies the effective signal.

The four-stage RF power detection circuit is composed of a special RF detector and its peripheral circuits. In the figure, the dedicated detector U9, resistors R49, R50, R56, R37, R53, R57 and capacitors C83, C90, C101, C77, C78, C79, C102, C103, and C1 form a power detection circuit, which amplifies and filters the front stage. The effective signal of the detector circuit realizes the conversion of frequency domain and time domain, so that the envelope signal can be efficiently read through the analog-to-digital conversion device.

Specifically, the signal sampling circuit includes: the ultrasonic signal is connected to one end of the capacitor C80 via the SONAR_A input end; the ultrasonic signal is connected to one end of the capacitor C86 via the SONAR_B input end, and the other end of the capacitor C80 is connected to the positive electrode of the first diode in the half-bridge D12, The cathode of the second diode in the half-bridge D12, one end of the capacitor C84 and one end of the resistor R47; the cathode of the first diode in the half-bridge D12 is connected to the anode of the second diode and the ground; the other end of the capacitor C84 One end of the resistor R3 is connected to the input end of the first-stage signal amplifying circuit; the other end of the resistor R3 is grounded and one end of the link resistor R4; the other end of the resistor R4 is connected to the other input end of the first-stage signal amplifying circuit and the capacitor C85. One end, the other end of the capacitor C85 is connected to the other end of the resistor R47, the other end of the capacitor C86 and the anode of the first diode in the half-bridge D13; the cathode of the first diode in the half-bridge D13 is connected to the second diode The anode and ground; the cathode of the second diode in the half-bridge D13 is connected to the other end of the capacitor C86.

Specifically, the first-level signal amplifying circuit includes: the other end of the capacitor C84 is connected to the input end of the first-level signal amplifying circuit, the input end of the first-level signal amplifying circuit is connected to one end of the resistor R45, and the other end of the resistor R45 is connected to the amplifier U8A. The second pin, one end of resistor R33 and one end of capacitor C74; the other end of capacitor C74 is connected to the first pin of amplifier U8A, the other end of resistor R33 and one end of resistor R44; the other end of resistor R44 is connected to the sixth pin of amplifier U8B pin, one end of the resistor R32 and one end of the capacitor C73; the other end of the capacitor C73 is connected to the other end of the resistor R32, the seventh pin of the amplifier U8B and the input end of the secondary signal bandpass filter amplifying circuit; the fifth pin of the amplifier U8B Ground; the other end of the capacitor C85 is connected to the other input end of the first-level signal amplifying circuit, and the other input end of the first-level signal amplifying circuit is connected to the resistor R48; the other end of the resistor R48 is connected to the third pin of the amplifier U8A and the resistor R51. One end and one end of capacitor C89; the other end of capacitor C89 is grounded and connected to the other end of resistor R51; the fourth pin of amplifier U8A is connected to negative 5V power supply, one end of capacitor C91 and one end of capacitor C92; the other end of capacitor C91 is grounded; The other end of the capacitor C92 is grounded; the eighth pin of the amplifier U8A is connected to the positive 5V power supply, one end of the capacitor C93 and one end of the capacitor C94; the other end of the capacitor C93 is grounded, and the other end of the capacitor C94 is grounded.

Specifically, the second-level signal band-pass filter amplifying circuit includes: the seventh pin of the amplifier U8B is connected to the input end of the second-level signal band-pass filter amplifying circuit, and the input end of the second-level signal band-pass filter amplifying circuit is connected to the input end of the resistor R35. One end, the other end of resistor R35 is connected to one end of resistor R42, one end of capacitor C81 and one end of capacitor C75; the other end of resistor R42 is grounded, and the other end of capacitor C75 is connected to one end of resistor R28 and the first pin of amplifier U7A, resistor R28 The other end of the amplifier U7A is connected to the second pin of the amplifier U7A and the other end of the capacitor C81, the third pin of the amplifier U7A is grounded; the eighth pin of the amplifier U7A is connected to the positive 5V power supply, one end of the capacitor C99 and one end of the capacitor C100; the capacitor The other end of C99 is grounded; the other end of capacitor C100 is grounded; the fourth pin of amplifier U7A is connected to the negative 5V power supply, one end of capacitor C97 and one end of capacitor C98; the other end of capacitor C97 is grounded, the other end of capacitor C98 is grounded, and the The first pin is connected to the input end of the three-stage signal band-pass filtering and amplifying circuit.

Specifically, the three-stage signal bandpass filtering and amplifying circuit includes: the first pin of the amplifier U7A is connected to the input end of the three-stage signal bandpass filtering and amplifying circuit, and the input end of the three-stage signal bandpass filtering and amplifying circuit is connected to the input end of the resistor R36. One end, the other end of resistor R36 is connected to one end of resistor R43, one end of capacitor C76 and one end of capacitor C82, the other end of resistor R43 is connected to ground, the other end of capacitor C76 is connected to one end of resistor R29 and the seventh pin of amplifier U7B, capacitor C82 The other end of the resistor R29 is connected to the sixth pin of the amplifier U7B, the fifth pin of the amplifier U7B is grounded, and the seventh pin of the amplifier U7B is connected to the input end of the four-stage RF power detection circuit.

Specifically, the four-stage RF power detection circuit includes: the seventh pin of the amplifier U7B is connected to the input end of the four-stage RF power detection circuit, the input end of the four-stage RF power detection circuit is connected to one end of the resistor R39, and the other end of the resistor R39 is connected. One end is connected to one end of resistor R49 and one end of capacitor C83, the other end of capacitor C83 is connected to one end of resistor R50 and the eighth pin of amplifier U9, the other end of resistor R49 is connected to one end of capacitor C90 and one end of resistor R56. The other end is connected to the other end of the resistor R50 and the first pin of the amplifier U9, the other end of the resistor R56 is grounded, the second pin of the amplifier U9 is grounded, the third pin of the amplifier U9 is connected to one end of the capacitor C101, and the other end of the capacitor C101 is connected to the ground. One end is grounded, the fourth pin of amplifier U9 is connected to one end of capacitor C102, one end of resistor R57, and one end of resistor R53, the other end of capacitor C102 is grounded, the other end of resistor R57 is grounded, and the other end of resistor R53 is connected to one end of capacitor C103 and one end of capacitor C1, the other end of capacitor C103 is grounded, the other end of capacitor C1 is grounded, the seventh pin of amplifier U9 is connected to the fifth pin of amplifier U9, one end of capacitor C78, one end of capacitor C79 and one end of resistor R37 , the sixth pin of amplifier U9 is connected to one end of capacitor C77, the other end of capacitor C77 is connected to the other end of C78, the other end of capacitor C79 and ground, and the other end of resistor R37 is connected to the positive 5V power supply.

Specifically, the capacitor C1 in the four-stage RF power detection circuit judges whether the capacitor C1 is required according to the actual debugging situation according to the capacitance in the actual circuit board, and the debugging voltage in the current circuit board reaches the preset value, then the four-stage RF power detection circuit Capacitor C1 is not required; if the debugging voltage in the current circuit board does not reach the preset value, capacitor C1 is required for the four-stage RF power detection circuit.

Specifically, the amplifier U9 is a dedicated amplifier, a logarithmic detector.

Specifically, a test point E7 is set at the connection between the resistor R57 and the resistor R53, and the test signal of the test point E7 is the valid signal after the ultrasonic wave is sampled, amplified and detected by the circuit.

Specifically, the amplifier in the signal sampling circuit works by sampling dual power supplies.

Example 2:

Example is a variation of Example 1

The ultrasonic reflection signals SONAR_A and SONAR_B in the signal sampling circuit are sampled by the filter capacitor and the half-bridge, and the signals are loaded at both ends of the resistor R47 to form a differential signal, and the differential signal is input into the RC filter circuit again. middle.

The amplifier sampling in the signal sampling circuit works in the way of dual power supply

The output signal is low-pass filtered by resistors R45 and R48 to remove burrs and noise signals, and then input to the second and third pins of amplifier U8 to amplify the signal by 100 times and output. Signal measurement point E5 can measure the amplified signal. The amplified signal is input to the sixth pin of the amplifier U8 to increase the output impedance of the signal. The output signal can be measured at the signal measuring point E1. The output signal is input to the second pin of the amplifier U7 after removing the burr and noise through the resistor R35 and the capacitor C81. Pin, the signal is amplified by 5.92 times by band-pass filter and then output from the first pin, the output signal is input to the sixth pin of amplifier U7 after removing burr and noise through resistor R36 and capacitor C82 again, and the signal is amplified by band-pass filter again After 5.92 times, it is output by the seventh pin. The output signal is input to the eighth pin of the special amplifier U9 through the resistor R39 and the capacitor C83, and the signal is converted from the frequency domain to the time domain through the special amplifier and then output through the eighth pin.

Finally, the signal output by the eighth pin is the ultrasonic reflection signal that needs to be finally detected.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying the indicated device. Or elements must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present application.

Those skilled in the art know that, in addition to implementing the system, device and each module provided by the present invention in the form of pure computer readable program code, the system, device and each module provided by the present invention can be completely implemented by logically programming the method steps. The same program is implemented in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, and embedded microcontrollers, among others. Therefore, the system, device and each module provided by the present invention can be regarded as a kind of hardware component, and the modules used for realizing various programs included in it can also be regarded as the structure in the hardware component; A module for realizing various functions can be regarded as either a software program for realizing a method or a structure within a hardware component.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essential content of the present invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily, provided that there is no conflict.

Claims (10)

1. An application system for processing an intermediate frequency ultrasonic signal received by a transducer, comprising:

the device comprises a signal sampling circuit, a first-stage signal amplifying circuit, a second-stage signal band-pass filtering amplifying circuit, a third-stage signal band-pass filtering amplifying circuit and a fourth-stage RF power detection circuit;

the output end of the signal sampling circuit is connected with the input end of the primary signal amplifying circuit;

the output end of the primary signal amplifying circuit is connected with the input end of the secondary signal band-pass filtering amplifying circuit;

the output end of the secondary signal band-pass filtering amplifying circuit is connected with the input end of the tertiary signal band-pass filtering amplifying circuit;

the output end of the three-level signal band-pass filtering amplifying circuit is connected with the four-level RF power detection circuit;

the signal sampling circuit is a primary detection circuit, comprises a capacitor, a resistor and a high-voltage switch diode, and completely outputs an original signal;

the primary signal amplifying circuit comprises a differential amplifying circuit and an inverting amplifying circuit, and amplifies and keeps an original signal in an equal proportion in a working linear interval of the amplifier;

the secondary signal band-pass filtering amplification circuit comprises a band-pass filtering amplification circuit, and can effectively filter clutter signals amplified by the primary signal amplification circuit and retain effective signals;

the three-level signal band-pass filtering and amplifying circuit can further filter clutter signals and amplify effective signals;

the four-stage RF power detection circuit comprises an RF special detector and a peripheral circuit, the frequency domain and the time domain conversion of the amplified and filtered effective signals is realized through the detection circuit, and envelope signals are efficiently read through an analog-to-digital conversion device.

2. The transducer-received intermediate frequency ultrasonic signal processing application of claim 1, wherein the signal sampling circuit comprises: the ultrasonic signal is connected with one end of a capacitor C80 through an SONAR _ A input end; an ultrasonic signal is connected with one end of a capacitor C86 through an input end of SONAR _ B, the other end of the capacitor C80 is connected with the anode of a first diode in the half-bridge D12, the cathode of a second diode in the half-bridge D12, one end of a capacitor C84 and one end of a resistor R47; the cathode of the first diode in the half-bridge D12 is connected with the anode of the second diode and the ground; the other end of the capacitor C84 is connected with one end of the resistor R3 and the input end of the primary signal amplifying circuit; the other end of the resistor R3 is grounded and is connected with one end of the link resistor R4; the other end of the resistor R4 is connected with the other input end of the primary signal amplifying circuit and one end of the capacitor C85, and the other end of the capacitor C85 is connected with the other end of the resistor R47, the other end of the capacitor C86 and the anode of the first diode in the half bridge D13; the cathode of the first diode in the half-bridge D13 is connected with the anode of the second diode and the ground; the cathode of the second diode in the half-bridge D13 is connected to the other end of the capacitor C86.

3. The if ultrasonic signal processing application system of claim 1, wherein the primary signal amplifying circuit comprises: the other end of the capacitor C84 is connected with the input end of the primary signal amplification circuit, the input end of the primary signal amplification circuit is connected with one end of a resistor R45, and the other end of the resistor R45 is connected with a second pin of the amplifier U8A, one end of the resistor R33 and one end of the capacitor C74; the other end of the capacitor C74 is connected with the first pin of the amplifier U8A, the other end of the resistor R33 and one end of the resistor R44; the other end of the resistor R44 is connected with the sixth pin of the amplifier U8B, one end of the resistor R32 and one end of the capacitor C73; the other end of the capacitor C73 is connected with the other end of the resistor R32, a seventh pin of the amplifier U8B and the input end of the secondary signal band-pass filtering amplification circuit; the fifth pin of amplifier U8B is connected to ground; the other end of the capacitor C85 is connected with the other input end of the primary signal amplifying circuit, and the other input end of the primary signal amplifying circuit is connected with the resistor R48; the other end of the resistor R48 is connected with the third pin of the amplifier U8A, one end of the resistor R51 and one end of the capacitor C89; the other end of the capacitor C89 is grounded and connected with the other end of the resistor R51; a fourth pin of the amplifier U8A is connected with a negative 5V power supply, one end of a capacitor C91 and one end of a capacitor C92; the other end of the capacitor C91 is grounded; the other end of the capacitor C92 is grounded; an eighth pin of the amplifier U8A is connected with a positive 5V power supply, one end of a capacitor C93 and one end of a capacitor C94; the other terminal of the capacitor C93 is grounded, and the other terminal of the capacitor C94 is grounded.

4. The if ultrasonic signal processing application system of claim 1, wherein the secondary signal bandpass filtering and amplifying circuit comprises: a seventh pin of the amplifier U8B is connected with an input end of the secondary signal band-pass filtering amplifying circuit, the input end of the secondary signal band-pass filtering amplifying circuit is connected with one end of a resistor R35, and the other end of the resistor R35 is connected with one end of a resistor R42, one end of a capacitor C81 and one end of a capacitor C75; the other end of the resistor R42 is grounded, the other end of the capacitor C75 is connected with one end of the resistor R28 and the first pin of the amplifier U7A, the other end of the resistor R28 is connected with the second pin of the amplifier U7A and the other end of the capacitor C81, and the third pin of the amplifier U7A is grounded; an eighth pin of the amplifier U7A is connected with a positive 5V power supply, one end of a capacitor C99 and one end of a capacitor C100; the other end of the capacitor C99 is grounded; the other end of the capacitor C100 is grounded; a fourth pin of the amplifier U7A is connected with a power supply minus 5V, one end of a capacitor C97 and one end of a capacitor C98; the other end of the capacitor C97 is grounded, the other end of the capacitor C98 is grounded, and a first pin of the amplifier U7A is connected with the input end of the three-stage signal band-pass filtering amplifying circuit.

5. The if ultrasonic signal processing application system of claim 1, wherein the three-stage signal bandpass filtering and amplifying circuit comprises: the first pin of the amplifier U7A is connected with the input end of the three-stage signal band-pass filtering amplifying circuit, the input end of the three-stage signal band-pass filtering amplifying circuit is connected with one end of a resistor R36, the other end of the resistor R36 is connected with one end of a resistor R43, one end of a capacitor C76 and one end of a capacitor C82, the other end of the resistor R43 is grounded, the other end of the capacitor C76 is connected with one end of the resistor R29 and the seventh pin of the amplifier U7B, the other end of the capacitor C82 is connected with the other end of the resistor R29 and the sixth pin of the amplifier U7B, the fifth pin of the amplifier U7B is grounded, and the seventh pin of the amplifier U7B is connected with.

6. The transducer-received intermediate frequency ultrasonic signal processing application of claim 1, wherein the four-stage RF power detection circuit comprises: the seventh pin of the amplifier U7B is connected with the input end of the four-stage RF power detection circuit, the input end of the four-stage RF power detection circuit is connected with one end of a resistor R39, the other end of the resistor R39 is connected with one end of a resistor R49 and one end of a capacitor C83, the other end of a capacitor C83 is connected with one end of a resistor R50 and the eighth pin of the amplifier U9, the other end of a resistor R49 is connected with one end of a capacitor C90 and one end of a resistor R56, the other end of a capacitor C90 is connected with the other end of a resistor R50 and the first pin of the amplifier U9, the other end of a resistor R56 is grounded, the second pin of the amplifier U9 is grounded, the third pin of the amplifier U9 is connected with one end of a capacitor C101, the other end of the capacitor C101 is grounded, the fourth pin of the amplifier U9 is connected with one end of a capacitor C102, one end of a resistor R57, one end of a resistor R53, the other, the other end of the capacitor C103 is grounded, the other end of the capacitor C1 is grounded, the seventh pin of the amplifier U9 is connected with the fifth pin of the amplifier U9, one end of the capacitor C78, one end of the capacitor C79 and one end of the resistor R37, the sixth pin of the amplifier U9 is connected with one end of the capacitor C77, the other end of the capacitor C77 is connected with the other end of the capacitor C78, the other end of the capacitor C79 is grounded, and the other end of the resistor R37 is connected with a positive 5V power supply.

7. The system as claimed in claim 6, wherein the capacitor C1 in the four-stage RF power detector circuit determines whether the capacitor C1 is needed according to the actual debugging condition of the capacitor in the circuit board, and if the debugging voltage in the circuit board reaches a preset value, the capacitor C1 is not needed in the four-stage RF power detector circuit; when the debugging voltage in the current circuit board does not reach the preset value, the four-stage RF power detection circuit needs a capacitor C1.

8. The if ultrasonic signal processing application received by the transducer of claim 6, wherein the amplifier U9 is a dedicated amplifier, a logarithmic detector.

9. The application system for processing the intermediate frequency ultrasonic signals received by the transducer according to claim 6, wherein a test point E7 is provided at the junction of the resistor R57 and the resistor R53, and a test signal of the test point E7 is an effective signal after ultrasonic waves are sampled, amplified and detected by a circuit.

10. The transducer-received intermediate frequency ultrasonic signal processing application system of claim 2, wherein the amplifier in the signal sampling circuit operates in a dual power supply mode.

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