CN109998596A - A kind of ultrasonic sensor with blood flow flow detection function - Google Patents
A kind of ultrasonic sensor with blood flow flow detection function Download PDFInfo
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- CN109998596A CN109998596A CN201910277021.0A CN201910277021A CN109998596A CN 109998596 A CN109998596 A CN 109998596A CN 201910277021 A CN201910277021 A CN 201910277021A CN 109998596 A CN109998596 A CN 109998596A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/02—Measuring pulse or heart rate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/06—Measuring blood flow
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4411—Device being modular
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
Abstract
The invention discloses a kind of ultrasonic sensors with blood flow flow detection function, emit the first ultrasonic listening analog signal by being provided with supersonic sounding module and receive the second ultrasonic listening analog signal transmission for feeding back and respectively received second ultrasonic listening analog signal is carried out being input to blood flow after branch using the demodulated signal of 2 90 degree of tunnel phase phase differences to blood flow signal shunt module and flows to processing module progress signal processing, blood flow flows to output ultrasonic wave after processing module is handled the second ultrasonic listening analog signal and detects digital signal to main control module, main control module receives processing ultrasonic listening digital signal and obtains blood flow flow direction to be measured, solving ultrasonic sensor in the prior art can not be effective, the technical issues of reliable detection blood flow direction, it provides a kind of effective, reliably there is blood flow stream To the ultrasonic sensor of detection function.
Description
Technical field
The present invention relates to technical field of medical equipment, visit more particularly, to a kind of ultrasound with blood flow flow detection function
Survey device.
Background technique
When using supersonic blood detection blood flow information (such as blood flow velocity, pulse frequency), due to blood of human body
Flowing causes vasodilation and contraction in human body, supersonic sounding to signal have positive blood flow signal and reversed blood flow signal,
It needs to carry out detection identification, to facilitate subsequent processing and analysis to blood flow signal.
In the prior art, ultrasonic sensor all can not effectively, reliably detect blood flow direction, therefore one kind is provided can examine
The ultrasonic sensor for surveying blood flow direction is the technical issues of this field must solve.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to provide a kind of ultrasonic sensor effectively, reliably with blood flow flow detection function.
The technical scheme adopted by the invention is that:
In a first aspect, the present invention provides a kind of ultrasonic sensor with blood flow flow detection function comprising:
Supersonic sounding module for emitting the first ultrasonic listening analog signal, and receives first ultrasonic listening
Analog signal passes through the second ultrasonic listening analog signal that blood back reflection is formed；
Blood flow signal shunt module, for received to the supersonic sounding module described respectively using 2 tunnel demodulated signals
Second ultrasonic listening analog signal carries out branch output processing；
Blood flow flows to processing module；For handling the ultrasonic listening of the blood flow signal shunt module branch output
Output ultrasonic wave detects digital signal after analog signal；
Main control module flows to data letter for receiving and processing the analysis ultrasonic listening digital signal to obtain blood flow
Breath.
Further, the supersonic sounding module includes ultrasonic probe, the ultrasonic probe include ultrasonic wave generation circuit,
Ultrasonic wave receives resonance circuit and ultrasonic wave transmitting circuit；The ultrasonic wave receives the output end of resonance circuit and the blood flow is believed
The input terminal connection of number shunt module, the output end of the ultrasound wave generation circuit are defeated with the ultrasonic wave transmitting circuit respectively
Enter the input terminal connection at end, the blood flow signal shunt module.
Further, the blood flow signal shunt module includes the first frequency dividing circuit and the second frequency dividing circuit；The ultrasound
First output end of wave generation circuit is connect with the first input end of first frequency dividing circuit, and the ultrasonic wave receives resonance electricity
The output end on road is connect with the second input terminal of first frequency dividing circuit, the output end and the blood of first frequency dividing circuit
Stream flows to the first input end connection of processing module, the second output terminal of the ultrasound wave generation circuit and the second frequency dividing electricity
The first input end on road connects, and the ultrasonic wave receives the second input of the output end and second frequency dividing circuit of resonance circuit
End connection, the output end of second frequency dividing circuit are connect with the second input terminal that the blood flow flows to processing module.
Further, first frequency dividing circuit includes: second resistance, 3rd resistor, the 4th resistance, the 5th capacitor,
Six capacitors, the second inductance and the second triode；First output of one end of the 4th resistance and the ultrasonic wave generation circuit
End connection, the other end of the 4th resistance are connect with one end of the 6th capacitor, the other end difference of the 6th capacitor
Connect with the base stage of one end of the 3rd resistor, second triode, the emitter of second triode respectively with institute
State the first output end connection of one end, ultrasonic wave reception resonance circuit of the second inductance, the other end of second inductance
Ground connection, the other end of 3rd resistor one end, described with the collector of second triode, the second resistance respectively
One end of 5th capacitor, the blood flow flow to the first input end connection of processing module, the other end of the second resistance and outer
Connect the connection of 2V power supply, the other end ground connection of the 5th capacitor.
Further, second frequency dividing circuit includes: the 5th resistance, the 6th resistance, the 7th resistance, the 7th capacitor,
Eight capacitors, third transistor, third inductance and third phase inverter；The input terminal and the ultrasonic wave of the third phase inverter generate
The second output terminal of circuit connects, and the output end of the third phase inverter is connect with one end of the 7th resistance, and the described 7th
The other end of resistance is connect with one end of the 8th capacitor, the other end of the 8th capacitor respectively with the 6th resistance
One end, the third transistor base stage connection, the emitter of the third transistor respectively with one end of the third inductance,
The ultrasonic wave receives the second output terminal connection of resonance circuit, the other end ground connection of the third inductance, the 6th resistance
The other end respectively with the collector of the third transistor, one end of the 5th resistance, one end of the 7th capacitor, institute
The second input terminal connection that blood flow flows to processing module is stated, the other end of the 5th resistance is connect with external 2V power supply, described
The other end of 7th capacitor is grounded.
Further, it includes the first blood flow flow direction processing submodule and the second blood flow flow direction that the blood flow, which flows to processing module,
Handle submodule；The first blood flow flow direction processing submodule includes the first filter amplification circuit and the first analog to digital conversion circuit,
The output end of first frequency dividing circuit is connect with the input terminal of first filter amplification circuit, the first filter and amplification electricity
The output end on road is connect with the input terminal of first analog to digital conversion circuit, the output end of first analog to digital conversion circuit and institute
State the input terminal connection of main control module；The second blood flow flow direction processing submodule includes the second filter amplification circuit and the second mould
Number conversion circuits, the output end of second frequency dividing circuit connect with the input terminal of second filter amplification circuit, and described the
The output end of two filter amplification circuits is connect with the input terminal of second analog to digital conversion circuit, second analog to digital conversion circuit
Output end connect with the input terminal of the main control module.
Further, first filter amplification circuit include the first low-pass filter circuit, the first signal amplification circuit and
First high-pass filtering circuit；The output end of first frequency dividing circuit is connect with the input terminal of first low-pass filter circuit,
The output end of first low-pass filter circuit is connect with the input terminal of first signal amplification circuit, and first signal is put
The output end of big circuit is connected in the input terminal of first high-pass filtering circuit, the output end of first high-pass filtering circuit
It is connect with the input terminal of first analog to digital conversion circuit.
Further, second filter amplification circuit include the second low-pass filter circuit, second signal amplifying circuit and
Second high-pass filtering circuit；The output end of second frequency dividing circuit is connect with the input terminal of second filter circuit, described
The output end of second filter circuit is connect with the input terminal of the second signal amplifying circuit, the second signal amplifying circuit
Output end is connect with the input terminal of second high-pass filtering circuit, the output end of second high-pass filtering circuit and described the
The input terminal of two analog-to-digital conversion modules connects.
The beneficial effects of the present invention are:
A kind of ultrasonic sensor with blood flow flow detection function of the present invention is by being provided with supersonic sounding module hair
It penetrates the first ultrasonic listening analog signal and receives the second ultrasonic listening analog signal transmission for feeding back to blood flow signal
After shunt module carries out branch to received second ultrasonic listening analog signal respectively using the demodulated signal of 2 road opposite in phase
It is input to blood flow and flows to processing module progress signal processing, blood flow flows to processing module will be at ultrasonic listening analog signal
Output ultrasonic wave detects digital signal to main control module after reason, and main control module receives and processes ultrasonic listening digital signal and takes
Blood flow flow direction to be measured is obtained, the skill of blood flow direction can not effectively, reliably be detected by solving ultrasonic sensor in the prior art
Art problem provides a kind of ultrasonic sensor effectively, reliably with blood flow flow detection function.
Detailed description of the invention
Fig. 1 is an a kind of specific embodiment module frame of the ultrasonic sensor with blood flow flow detection function of the present invention
Figure；
Fig. 2 is the ultrasound of supersonic sounding module in a kind of ultrasonic sensor with blood flow flow detection function of the present invention
One specific embodiment circuit diagram of wave generation circuit；
Fig. 3 is the ultrasound of supersonic sounding module in a kind of ultrasonic sensor with blood flow flow detection function of the present invention
One specific embodiment circuit diagram of wave transmitting circuit；
Fig. 4 is the ultrasound of supersonic sounding module in a kind of ultrasonic sensor with blood flow flow detection function of the present invention
One specific embodiment circuit diagram of wave reception resonance circuit；
Fig. 5 is blood flow signal shunt module in a kind of ultrasonic sensor with blood flow flow detection function of the present invention
One specific embodiment circuit diagram of the first frequency dividing circuit；
Fig. 6 is blood flow signal shunt module in a kind of ultrasonic sensor with blood flow flow detection function of the present invention
One specific embodiment circuit diagram of the second frequency dividing circuit；
Fig. 7 is that blood flow flows to processing module in a kind of ultrasonic sensor with blood flow flow detection function of the present invention
One specific embodiment circuit diagram of the first filter amplification circuit and the second filter amplification circuit；
Fig. 8 is that blood flow flows to processing module in a kind of ultrasonic sensor with blood flow flow detection function of the present invention
One specific embodiment circuit diagram of the first analog to digital conversion circuit；
Fig. 9 is signal flow output module in a kind of ultrasonic sensor with blood flow flow detection function of the present invention
One specific embodiment circuit diagram of the second analog to digital conversion circuit；
Figure 10 is the one specific of main control module in a kind of ultrasonic sensor with blood flow flow detection function of the present invention
Embodiment circuit diagram.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
As shown in Figure 1, in the present embodiment a kind of ultrasonic sensor with blood flow flow detection function it include ultrasound
Detecting module, blood flow signal shunt module, blood flow flow to processing module and main control module；It is by being provided with supersonic sounding module
Emit the first ultrasonic listening analog signal and receive the second ultrasonic listening analog signal transmission to the blood flow fed back and believes
Number shunt module inputs after carrying out branch reception to received second ultrasonic listening analog signal respectively using 2 tunnel demodulated signals
Processing module is flowed to blood flow and carries out signal processing, and blood flow flows to processing module for received second ultrasonic listening analog signal
Output ultrasonic wave detects digital signal to main control module after being handled, and main control module receives and processes ultrasonic listening number letter
Number and obtain blood flow to be measured flow direction, solve in the prior art ultrasonic sensor can not effectively, reliably detect blood flow side
To the technical issues of.
In the present embodiment, supersonic sounding module is ultrasonic probe comprising ultrasonic wave generation circuit, ultrasonic wave receive resonance
Circuit and ultrasonic wave transmitting circuit, blood flow signal shunt module include the first frequency dividing circuit and the second frequency dividing circuit.Specifically,
Referring to Fig. 2, ultrasonic wave generation circuit includes 8MHz without source crystal oscillator Y1, the 9th resistance R9 to twelfth resistor R12, the 5th inductance
L5, the 11st capacitor R11, the 12nd capacitor C12, the first phase inverter U1 and the second phase inverter U2；Wherein twelfth resistor R12 is
Slide rheostat, X1 end of the 8MHz without source crystal oscillator Y1 respectively with one end of the 9th resistance R9, one end of the 12nd capacitor C12,
The input terminal of one phase inverter U1 connects, X2 end of the 8MHz without source crystal oscillator Y1 respectively with the output end of the first phase inverter U1, the
One end connection of the input terminal of two phase inverter U2, the other end of the 9th resistance R9, the 11st capacitor C11, the 11st capacitor C11's
The other end connect with the other end of the 12nd capacitor C12 after altogether, the output end of the second phase inverter U2 is ultrasonic wave generation circuit
The first output end, the output end of the second phase inverter U2 respectively with the input terminal of ultrasonic wave transmitting circuit, the first frequency dividing circuit
One end connection of first input end, the tenth resistance R10, the other end of the tenth resistance R10 are connect with one end of the 5th inductance L5, the
The other end second output terminal of wave generation circuit (i.e. ultrasonic) of five inductance L5 respectively with one end of eleventh resistor R11, the tenth
The first fixing end of two resistance R12 connects, and the other end of eleventh resistor R11 is connect with external 2V power supply, twelfth resistor R12
Sliding end, the 20th resistance R12 the second fixing end connection after altogether；It is defeated by the first output end of ultrasonic echography circuit
The 8.1MHZ signal of 8MHZ signal and second output terminal output out is actually the signal phase of second output terminal than first
The signal amplitude frequency of 90 degree of the phase lag signal of output end, practical two output ends is consistent, and 8.1MHZ is in order to distinguish two
The mark that the signal of a output end is made there are the difference of phase, by 90 degree of phase phase difference of 2 tunnel demodulated signals for the
One frequency dividing circuit and the second frequency dividing circuit carry out the reception of signal；Meanwhile it supplying ultrasonic wave transmitting circuit and launching outward ultrasonic wave
Detection simulation signal.Referring to Fig. 3, ultrasonic wave transmitting circuit includes the 9th capacitor C9, the tenth capacitor C10, the 8th resistance R8, the 4th
Inductance L4, the 4th triode Q4 and emitting ceramic chip；Wherein, the both ends of emitting ceramic chip connect with the interface of J1 and J2 respectively
It connects, one end (input terminal of i.e. ultrasonic wave transmitting circuit) of the 9th capacitor C9 is connect, the 9th with the output end of the second phase inverter U2
The other end of capacitor C9 is connect with one end of the base stage of the 4th triode Q4, the 8th resistance R8 respectively, and the 8th resistance R8's is another
External 2V power supply is accessed after connecting respectively with one end of one end of the tenth capacitor C10, the 4th inductance L4 in end, the tenth capacitor C10's
The other end is connect with the other end, the J1 interface of the collector of the 4th triode Q4, the 4th inductance L4 respectively, the 4th triode Q4's
Emitter connect with J2 interface after altogether, by passing through transmitting again after receiving the 8MHz signal source that ultrasonic wave generation circuit generates
Ceramic wafers emit the first ultrasonic listening analog signal outward.Referring to Fig. 4, it includes receiving pottery that ultrasonic wave, which receives resonance circuit,
Porcelain chip, the first resonance transformer T1, the first amplifier tube Q1, first capacitor C1 to the 4th capacitor C4, first resistor R1, the first electricity
Feel L1, the first output terminals A S1 and second output terminal AS2；Wherein, the first amplifier tube Q1 is the first triode Q1, and it is brilliant to receive ceramics
The both ends of piece are connect with the interface of J9A and J10A respectively, and the first input end of the first resonance transformer T1 is connect with J9A interface,
The second input terminal of first resonance transformer T1 is connect with J10A interface, the first output end of the first resonance transformer T1 respectively with
The base stage connection of one end of the 4th capacitor C4, the first triode Q1, the second output terminal of the first resonance transformer T1 is respectively with the
The other end of four capacitor C4, the first triode Q1 emitter connection after altogether, the collector of the first triode Q1 is respectively with the
One end connection of one end of one inductance L1, one end of first resistor R1, one end of first capacitor C1, the second capacitor C2, the first electricity
The other end of sense L1 accesses external 2V power supply after connecting respectively with one end of the other end of first resistor R1, third capacitor C3, the
The other end of three capacitor C3 is grounded, and the other end of first capacitor C1 accesses blood flow signal branch after connecting with the first output terminals A S1
Module, the other end of the second capacitor C2 accesses blood flow signal shunt module after connecting with second output terminal AS2, by receiving pottery
The second ultrasonic listening analog signal that porcelain wafer receipt is fed back is after the first triode Q1 amplification by the first output end
AS1, second output terminal AS2 are exported to blood flow signal shunt module.
Referring to Fig. 5, in the present embodiment, the first frequency dividing circuit include second resistance R2 to the 4th resistance R4, the 5th capacitor C5,
6th capacitor C6, the second inductance L2 and the second triode Q2；Wherein, one end (i.e. of the first frequency dividing circuit of the 4th resistance R4
One input terminal) it is connect with the output end of the second phase inverter U2 in ultrasonic wave generation circuit, the other end of the 4th resistance R4 and the
One end of six capacitor C6 connects, the other end of the 6th capacitor C6 base with one end of 3rd resistor R3, the second triode Q2 respectively
Pole connection, the emitter (i.e. the second input terminal of the first frequency dividing circuit) of the second triode Q2 respectively with the second inductance L2 one
End, ultrasonic wave receive the first output terminals A S1 connection of resonance circuit, and the other end of the second inductance L2 is grounded, 3rd resistor R3's
The other end is respectively and at the collector of the second triode Q2, one end of second resistance R2, one end of the 5th capacitor C5, blood flow flow direction
The first input end connection of module is managed, the other end of second resistance R2 is connect with external 2V power supply, the other end of the 5th capacitor C5
Ground connection, by the first output end for receiving 8MHz signal source and ultrasonic wave reception resonance circuit that ultrasonic wave generation circuit generates
Output to blood flow flows to processing module after the signal that AS1 is transmitted.Referring to Fig. 6, the second frequency dividing circuit includes the 5th resistance R5 to the
Seven resistance R7, the 7th capacitor C7, the 8th capacitor C8, third transistor Q3, third inductance L3 and third phase inverter U3；Wherein,
The input terminal of three phase inverter U3 is connect with the output end of the second phase inverter U2 in ultrasonic wave generation circuit, third phase inverter U3's
Output end is connect with one end of the 7th resistance R7, and the other end of the 7th resistance R7 is connect with one end of the 8th capacitor C8, the 8th electricity
The other end for holding C8 is connect with the base stage of one end of the 6th resistance R6, third transistor Q3 respectively, the transmitting of third transistor Q3
The second output terminal AS2 that pole receives resonance circuit with one end of third inductance L3, ultrasonic wave respectively is connect, and third inductance L3's is another
One end ground connection, the other end of the 6th resistance R6 respectively with the collector of third transistor Q3, one end of the 5th resistance R5, the 7th electricity
One end of appearance C7, blood flow flow to the second input terminal connection of processing module, and the other end of the 5th resistance R5 and external 2V power supply connect
It connects, the other end of the 7th capacitor C7 ground connection, by receiving 8MHz signal source that ultrasonic wave generation circuit generates and being accessed the
After the signal that three phase inverter U3 and the second output terminal AS2 for receiving ultrasonic wave reception resonance circuit are transmitted at output to blood flow flow direction
Manage module.
In the present embodiment, it includes at the first blood flow flow direction processing submodule and the second blood flow flow direction that blood flow, which flows to processing module,
Manage submodule；Wherein, the first blood flow flow direction processing submodule includes the first filter amplification circuit and the first analog to digital conversion circuit, the
Two blood flows flow direction processing submodule includes the second filter amplification circuit and the second analog to digital conversion circuit, the first filter amplification circuit packet
Include the first low-pass filter circuit, the first signal amplification circuit and the first high-pass filtering circuit, the second filter amplification circuit includes the
Two low-pass filter circuits, second signal amplifying circuit and the second high-pass filtering circuit.Specifically, referring to Fig. 7, the first low-pass filtering
Circuit includes: the 13rd capacitor C13 to the 17th capacitor C17, thirteenth resistor R13 to the 16th resistance R16, the 5th triode
Q5 and the first filtered switch chip U4；First signal amplification circuit includes: the 17th resistance R17 to the 19th resistance R19 and
One operational amplifier U5；First high-pass filtering circuit includes: the 18th capacitor C18, the 19th capacitor C19, the 20th resistance R20
To the 22nd resistance R22 and second operational amplifier U6；Second low-pass filter circuit includes: the 20th capacitor C20 to second
14 capacitor C24, the 23rd resistance R23 to the 25th resistance R25 and the second filtered switch chip U7；Second signal amplification
Circuit includes: the 26th resistance R26 to the 28th resistance R28 and third operational amplifier U8；Second high-pass filtering circuit
It include: the 20th capacitor C25, the 26th capacitor C26, the 29th resistance R29 to the 31st resistance R31 and the 4th operation
Amplifier U9；Wherein, the first filtered switch chip U4 and the second filtered switch chip U7 is TC4W66F chip, the first operation
Amplifier U5 to four-operational amplifier U9 is TL064 operational amplifier, and the tenth resistance R10 and the 20th resistance R20 are
Slide rheostat；One end (i.e. the input terminal of the first filter amplification circuit) of 13rd capacitor C13 is defeated with the first frequency dividing circuit
Outlet SI1 connection, for the second ultrasonic listening analog signal that the transmitting of received ultrasonic signal detection probe comes, the 13rd electricity
The other end for holding C13 is connect with the first fixing end of the tenth resistance R10, the second fixing end ground connection of the tenth resistance R10, the tenth electricity
Hinder R10 sliding end respectively with one end of eleventh resistor R11, one end of the 14th capacitor C14, the first filtered switch chip U4
Input terminal connection, eleventh resistor R11 the other end ground connection, the other end of the 14th capacitor C14 respectively with twelfth resistor
One end connection of one end of R12, the 15th capacitor C15, the other end of the 15th capacitor C15 is respectively with the 16th capacitor C16's
One end, one end of the 17th capacitor C17, the normal phase input end of the first operational amplifier U5, the 14th resistance R14 one end connect
It connects, the other end of the 16th capacitor C16 is connect with the output end of the first filtered switch chip U4, and the 14th resistance R14's is another
End ground connection, the other end of twelfth resistor R12 respectively with the other end of the 17th capacitor C17, the first operational amplifier U5 it is anti-
One end connection of phase input terminal, one end of the 15th resistance R15, the 16th resistance R16, another termination of the 15th resistance R15
Ground, the other end of the 16th resistance R16 connect with one end of the output end of the first operational amplifier U5, the 18th capacitor C18 respectively
It connects, the other end of the 18th capacitor C18 is inputted with the positive of one end of the 17th resistance R17, second operational amplifier U6 respectively
After holding connection, the other end of the 17th resistance R17 to connect with one end of the 18th resistance R18 altogether, the 18th resistance R18's is another
One end respectively with the inverting input terminal of second operational amplifier U6, one end of the 19th capacitor C19, the 19th resistance R19 one
End connection, the other end of the 19th resistance R19 respectively with the other end of the 19th capacitor C19, second operational amplifier U6 it is defeated
Outlet connection.Wherein, the enable end IN2 of the first filtered switch chip respectively with one end of thirteenth resistor R13, the 5th triode
The emitter of Q5 connects, and the base stage of the 5th triode Q5 is connect with main control module, the collector and external 5V of the 5th triode Q5
Power supply connection, the other end of thirteenth resistor R13 are connect with external -4.6V power supply, the first operational amplifier U5 and the second operation
The positive supply input terminal of amplifier U6 accesses 5V power supply, negative supply input terminal access -4.6V power supply.Second filter and amplification electricity
The circuit structure on road is substantially consistent with the circuit structure of the first filter amplification circuit, as shown in fig. 7, but it should be noted that second
The enable end of filtered switch chip U7 passes through the 5th triode Q5 after can connecting with the enable end of the first filtered switch chip U4 again
It is connect with main control module；By setting the first filter amplification circuit and the second filter amplification circuit, by the first frequency dividing circuit and the
The signal that frequency-halving circuit transmits exports after being filtered amplification, ensure that effective, the reliability of follow-up signal processing.
As shown in Figure 8 and Figure 9, in the present embodiment, the first analog-to-digital conversion module and the second analog-to-digital conversion module are respectively used to
The 2 tunnel ultrasonic listening analog signals that first filter amplification circuit and the second filter amplification circuit export are converted into ultrasonic wave to visit
It is exported after surveying digital signal；Specifically, the first analog-to-digital conversion module includes the 27th capacitor C27, the 28th referring to Fig. 8
Capacitor C28, the 32nd resistance R32 to the 38th resistance R38, first diode D1, the second diode D2, first comparator
U10 and the first modulus conversion chip U11；Wherein, first comparator U10 is LM393 comparator, the first modulus conversion chip U11
For 74HC74 chip, one end of the 27th capacitor C27 and the output end of the first filter amplification circuit are (referring to Fig. 7, i.e., the second fortune
Calculate amplifier output end U6) A1B connection, the other end of the 27th capacitor C27 respectively with the 32nd resistance R32 one
One end connection at end, the 33rd resistance R33, the other end ground connection of the 32nd resistance R32, the 33rd resistance R33's is another
One end connects with the inverting input terminal of the anode of first diode D1, the cathode of the second diode D2, first comparator U10 respectively
Connect, the cathode of first diode D1 connect with the anode of the second diode D2 after altogether, one end of the 34th resistance R34 and outer
Connect -4.6V power supply connection, the other end of the 34th resistance R34 respectively with one end of the 35th resistance R35, the 28th electricity
Hold the non-inverting input terminal connection of one end of C28, one end of the 36th resistance R36, first comparator U10, the 35th resistance
The other end of R35 is grounded, and the other end of the 28th capacitor C28 is respectively compared with the other end of the 36th resistance R36, first
The output end of device U10, one end of the 37th resistance R37, one end of the 38th resistance R38, the second modulus conversion chip U13
Data input pin D (referring to Fig. 9), the first modulus conversion chip U11 reset terminalConnection, the 37th resistance R37's
The other end is connect with external 5V power supply, the clock signal of the other end of the 38th resistance R38 and the first modulus conversion chip U11
Input terminal CLK connection, the Q output of the first modulus conversion chip U11 are connect with main control module；Referring to Fig. 9, the second analog-to-digital conversion
Module includes the 29th capacitor C29, the 30th capacitor C30, the 39th resistance R39 to the 46th resistance R46, the three or two
Pole pipe D3, the 4th diode D4, the second comparator U12 and the second modulus conversion chip U13；Wherein, wherein the second comparator
U12 is LM393 comparator, and the second modulus conversion chip U13 is 74HC74 chip, one end and second of the 29th capacitor C29
Output end (referring to Fig. 7, the i.e. output end of four-operational amplifier U9) A2B connection of filter amplification circuit, the 29th capacitor
The other end of C29 is connect with one end of one end of the 39th resistance R39, the 40th resistance R40 respectively, the 39th resistance
The other end of R39 is grounded, the other end of the 40th resistance R40 respectively with the anode of third diode D3, the 4th diode D4
The inverting input terminal connection of cathode, the second comparator U12, the cathode of third diode D3 are connect with the anode of the 4th diode D4
Afterwards altogether, one end of the 41st resistance R41 is connect with external -4.6V power supply, the other end of the 41st resistance R41 respectively with
One end of 42nd resistance R42, one end of the 30th capacitor C30, one end of the 43rd resistance R43, the second comparator U12
Non-inverting input terminal connection, the other end ground connection of the 42nd resistance R42, the other end of the 30th capacitor C30 is respectively with the 4th
The other end of 13 resistance R43, the output end of the second comparator U12, one end of the 44th resistance R44, the 45th resistance
One end of R45 connects, and the other end of the 44th resistance R44 is connect with external 5V power supply, the other end of the 45th resistance R45
Respectively with the data input pin D of the first modulus conversion chip U11 (referring to Fig. 8), one end of the 46th resistance R46, the second mould
The reset terminal of number conversion chip U13Connection, the other end of the 46th resistance R46 and the second modulus conversion chip U13's
Clock signal input terminal CLK connection, the Q output of the second modulus conversion chip U13 are connect with main control module.Wherein, the first ratio
It is connect with external 5V power supply compared with the positive supply input terminal of device U10 and the second comparator U12, negative supply input terminal is grounded respectively.
It is whole to be provided with the A2B ultrasonic listening analog signal progress waveform that the first analog-to-digital conversion module exports the second filter amplification circuit
Output is to main control module after shape and analog-to-digital conversion, the A1B ultrasound that the second analog-to-digital conversion module exports the first filter amplification circuit
Wave detection simulation signal exports after carrying out waveform shaping and analog-to-digital conversion to main control module.As shown in Figure 10, main control module U14 packet
STM32F103R8T6 chip is included, the connection relationship of pin by receiving the first signal flow output sub-module as shown, pass
It passs the blood flow signal come backward and second signal flows to the forward blood flow signal that output sub-module transmitting comes, it is known that detection
The data information forward, backward of blood flow.
To sum up, a kind of ultrasonic sensor with blood flow flow detection function of the present invention passes through setting supersonic sounding module
Emit the first ultrasonic listening analog signal, and receives the first ultrasonic listening analog signal is formed by blood back reflection the
The first frequency dividing circuit and the second frequency dividing circuit, the demodulation letter of the first frequency dividing circuit are respectively connected to after two ultrasonic listening analog signals
Number and the modulated signal of ultrasonic wave transmitting circuit be identical signal, the demodulated signal of the second frequency dividing circuit is and ultrasonic wave emits
The modulating signal phase of circuit differs 90 degree of signal, the second is surpassed by the demodulated signal of 2 90 degree of tunnel phase phase differences to received
Be filtered respectively after acoustic detection analog signal branch amplification reconvert at ultrasonic listening digital signal can obtain respectively to
Preceding and both direction backward blood flow flows to signal, and final output to main control module achieves effective, reliable blood flow and flows to number
According to solving the technical issues of ultrasonic sensor can not effectively, reliably detect blood flow direction in the prior art.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (8)
1. a kind of ultrasonic sensor with blood flow flow detection function characterized by comprising
Supersonic sounding module for emitting the first ultrasonic listening analog signal, and receives the first ultrasonic listening simulation
Signal passes through the second ultrasonic listening analog signal that blood back reflection is formed；
Blood flow signal shunt module, for utilizing 2 tunnel demodulated signals respectively received to the supersonic sounding module described second
Ultrasonic listening analog signal carries out branch output processing；
Blood flow flows to processing module；For handling the ultrasonic listening simulation of the blood flow signal shunt module branch output
Output ultrasonic wave detects digital signal after signal；
Main control module flows to data information for receiving and processing the analysis ultrasonic listening digital signal to obtain blood flow.
2. the ultrasonic sensor according to claim 1 with blood flow flow detection function, which is characterized in that described super
Acoustic detection module includes ultrasonic probe, and the ultrasonic probe includes ultrasonic wave generation circuit, ultrasonic wave reception resonance circuit and surpasses
Sonic wave transmitting circuit；The ultrasonic wave receives the output end of resonance circuit and the input terminal of the blood flow signal shunt module connects
It connects, input terminal, the blood flow signal of the output end of the ultrasound wave generation circuit respectively with the ultrasonic wave transmitting circuit divide
The input terminal of road module connects.
3. the ultrasonic sensor according to claim 2 with blood flow flow detection function, which is characterized in that the blood
Flowing signal shunt module includes the first frequency dividing circuit and the second frequency dividing circuit；It is described ultrasound wave generation circuit the first output end with
The first input end of first frequency dividing circuit connects, and the ultrasonic wave receives the output end and first frequency dividing of resonance circuit
Second input terminal of circuit connects, and the output end and the blood flow of first frequency dividing circuit flow to the first input of processing module
The second output terminal of end connection, the ultrasound wave generation circuit is connect with the first input end of second frequency dividing circuit, described
The output end that ultrasonic wave receives resonance circuit is connect with the second input terminal of second frequency dividing circuit, second frequency dividing circuit
Output end connect with the second input terminal that the blood flow flows to processing module.
4. the ultrasonic sensor according to claim 3 with blood flow flow detection function, which is characterized in that described
One frequency dividing circuit includes: second resistance, 3rd resistor, the 4th resistance, the 5th capacitor, the 6th capacitor, the second inductance and the two or three
Pole pipe；One end of 4th resistance is connect with the first output end of the ultrasonic wave generation circuit, the 4th resistance it is another
One end is connect with one end of the 6th capacitor, the other end of the 6th capacitor respectively with one end of the 3rd resistor, institute
State the base stage connection of the second triode, the emitter of second triode respectively with one end of second inductance, described super
First output end of acoustic receiver resonance circuit connects, the other end ground connection of second inductance, the 3rd resistor it is another
End respectively with the collector of second triode, one end of the second resistance, one end of the 5th capacitor, the blood flow
The first input end connection of processing module is flowed to, the other end of the second resistance is connect with external 2V power supply, the 5th electricity
The other end of appearance is grounded.
5. the ultrasonic sensor according to claim 3 or 4 with blood flow flow detection function, which is characterized in that institute
Stating the second frequency dividing circuit includes: the 5th resistance, the 6th resistance, the 7th resistance, the 7th capacitor, the 8th capacitor, third transistor,
Three inductance and third phase inverter；The second output terminal of the input terminal of the third phase inverter and the ultrasonic wave generation circuit connects
Connect, the output end of the third phase inverter is connect with one end of the 7th resistance, the other end of the 7th resistance with it is described
One end of 8th capacitor connects, the other end of the 8th capacitor respectively with one end of the 6th resistance, the three or three pole
The base stage of pipe connects, and the emitter of the third transistor receives with one end of the third inductance, the ultrasonic wave humorous respectively
Shake circuit second output terminal connection, the third inductance the other end ground connection, the other end of the 6th resistance respectively with institute
State the collector of third transistor, one end of the 5th resistance, one end of the 7th capacitor, blood flow flow direction processing mould
Second input terminal of block connects, and the other end of the 5th resistance is connect with external 2V power supply, the other end of the 7th capacitor
Ground connection.
6. the ultrasonic sensor according to claim 3 with blood flow flow detection function, which is characterized in that the blood
It includes the first blood flow flow direction processing submodule and the second blood flow flow direction processing submodule that stream, which flows to processing module,；First blood flow
Flow direction processing submodule includes the first filter amplification circuit and the first analog to digital conversion circuit, the output end of first frequency dividing circuit
It is connect with the input terminal of first filter amplification circuit, the output end of first filter amplification circuit and first modulus
The input terminal of conversion circuit connects, and the output end of first analog to digital conversion circuit is connect with the input terminal of the main control module；
The second blood flow flow direction processing submodule includes the second filter amplification circuit and the second analog to digital conversion circuit, second frequency dividing
The output end of circuit is connect with the input terminal of second filter amplification circuit, the output end of second filter amplification circuit with
The input terminal of second analog to digital conversion circuit connects, output end and the main control module of second analog to digital conversion circuit
Input terminal connection.
7. the ultrasonic sensor according to claim 6 with blood flow flow detection function, which is characterized in that described
One filter amplification circuit includes the first low-pass filter circuit, the first signal amplification circuit and the first high-pass filtering circuit；Described
The output end of one frequency dividing circuit is connect with the input terminal of first low-pass filter circuit, first low-pass filter circuit it is defeated
Outlet is connect with the input terminal of first signal amplification circuit, and the output end of first signal amplification circuit is in described first
The input terminal of high-pass filtering circuit connects, the output end of first high-pass filtering circuit and first analog to digital conversion circuit
Input terminal connection.
8. the ultrasonic sensor according to claim 6 or 7 with blood flow flow detection function, which is characterized in that institute
Stating the second filter amplification circuit includes the second low-pass filter circuit, second signal amplifying circuit and the second high-pass filtering circuit；Institute
The output end for stating the second frequency dividing circuit is connect with the input terminal of second filter circuit, the output end of second filter circuit
It is connect with the input terminal of the second signal amplifying circuit, the output end of the second signal amplifying circuit and second high pass
The input terminal of filter circuit connects, the input of the output end of second high-pass filtering circuit and second analog-to-digital conversion module
End connection.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112295120A (en) * | 2019-07-29 | 2021-02-02 | 河南翔宇医疗设备股份有限公司 | Ultrasonic physiotherapy equipment and control device of ultrasonic wave power thereof |
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