CN110037678B - Blood flow velocity detecting system - Google Patents
Blood flow velocity detecting system Download PDFInfo
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- CN110037678B CN110037678B CN201910277650.3A CN201910277650A CN110037678B CN 110037678 B CN110037678 B CN 110037678B CN 201910277650 A CN201910277650 A CN 201910277650A CN 110037678 B CN110037678 B CN 110037678B
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- 230000017531 blood circulation Effects 0.000 title claims abstract description 40
- 230000003321 amplification Effects 0.000 claims abstract description 88
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 88
- 238000001514 detection method Methods 0.000 claims abstract description 51
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 28
- 239000010703 silicon Substances 0.000 claims abstract description 28
- 239000000523 sample Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 239000008280 blood Substances 0.000 description 4
- 210000004369 blood Anatomy 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 102220511326 F-actin-capping protein subunit beta_Q21A_mutation Human genes 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004962 physiological condition Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/026—Measuring blood flow
- A61B5/0295—Measuring blood flow using plethysmography, i.e. measuring the variations in the volume of a body part as modified by the circulation of blood therethrough, e.g. impedance plethysmography
Abstract
The invention discloses a blood flow velocity detection system, which is characterized in that a main control circuit and a switch control circuit are arranged to control the work of a transmitting end of a silicon photodetector, a carrier circuit and a first signal amplification control circuit are also arranged to control the output signal of the first signal amplification circuit, and the first filter circuit, a first voltage follower circuit and a first signal amplification circuit are matched to realize the blood flow velocity detection.
Description
Technical Field
The invention relates to the field of blood flow detection, in particular to a blood flow velocity detection system.
Background
For various diseases of human body, along with the development of technology, the doctor can be assisted in diagnosing the diseases by acquiring human body parameters, wherein blood flow parameters can well reflect physiological conditions of human bodies, and blood flow speed is a very important one of various blood flow parameters.
At present, it is known that the ultrasonic doppler detection technology can be used for detecting the blood flow velocity, but the scheme is inconvenient to operate and has high requirement on the knowledge level of operators, in addition, the signal processing process is complex, and the defect of the scheme causes low detection efficiency of the blood flow velocity.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, it is an object of the present invention to provide a blood flow velocity detection system for achieving blood flow velocity detection.
The technical scheme adopted by the embodiment of the invention is as follows: the utility model provides a blood velocity detecting system, includes silicon photodetector, carrier circuit, switch control circuit, main control circuit, first filter circuit, first voltage follower circuit, first signal amplification control circuit and first signal amplification circuit, carrier circuit's output with switch control circuit's input is connected, main control circuit's output with switch control circuit's control end is connected, switch control circuit's output with silicon photodetector's transmitting terminal, silicon photodetector's receiving terminal with first filter circuit's input is connected, first filter circuit's output with first voltage follower circuit's input is connected, first voltage follower circuit's output with first signal amplification circuit's input is connected, first signal amplification circuit's output with main control circuit's input is connected, carrier circuit's output with first signal amplification control circuit's control end is connected, first signal amplification control circuit is used for controlling first signal amplification's output signal size, first signal amplification circuit's output is connected with first signal amplification circuit.
Further, the blood flow velocity detection system further comprises a third signal amplification circuit, wherein the output end of the first filtering circuit is connected with the input end of the third signal amplification circuit, and the output end of the third signal amplification circuit is connected with the input end of the switch control circuit.
Further, the blood flow velocity detection system further comprises a second voltage follower circuit and a second signal amplifier circuit, wherein the output end of the first signal amplifier circuit is connected with the input end of the second voltage follower circuit, the output end of the second voltage follower circuit is connected with the input end of the second signal amplifier circuit, and the output end of the second signal amplifier circuit is connected with the input end of the main control circuit.
Further, the blood flow velocity detection system further comprises a second filter circuit, wherein the output end of the second signal amplification circuit is connected with the input end of the second filter circuit, and the output end of the second filter circuit is connected with the input end of the main control circuit.
Further, the blood flow velocity detection system further comprises a second signal amplification control circuit for controlling the output signal of the second signal amplification circuit, wherein the output end of the main control circuit is connected with the control end of the second signal amplification control circuit, and the output end of the second signal amplification control circuit is connected with the input end of the second signal amplification circuit.
Further, the second signal amplification control circuit comprises an amplification factor control circuit and/or an input signal amplitude control circuit, the output end of the main control circuit is connected with the control end of the amplification factor control circuit and the control end of the input signal amplitude control circuit, and the output end of the amplification factor control circuit and the output end of the input signal amplitude control circuit are connected with the input end of the second signal amplification circuit.
Further, the amplification factor control circuit comprises a first electronic switch, a second electronic switch, a first control resistor and a second control resistor, wherein the first connecting end of the first electronic switch and the first connecting end of the second electronic switch are connected with the output end of the second signal amplification circuit, the second connecting end of the first electronic switch and one end of the first control resistor are connected, the second connecting end of the second electronic switch and one end of the second control resistor are connected, the other end of the first control resistor and the other end of the second control resistor are connected with the input end of the second signal amplification circuit, and the output end of the main control circuit is connected with the control end of the first electronic switch and the control end of the second electronic switch respectively.
Further, the input signal amplitude control circuit comprises a third electronic switch, a third control resistor and a fourth control resistor, wherein a first connection end of the third electronic switch is connected with a reference level, a second connection end of the third electronic switch is connected with one end of the fourth control resistor, one end of the third control resistor is connected with the reference level, the other end of the third control resistor is connected with the other end of the fourth control resistor, the other end of the third control resistor is connected with the input end of the second signal amplifying circuit, and the output end of the main control circuit is connected with the control end of the third electronic switch.
Further, the first signal amplification control circuit comprises an inverter and a two-way analog switch, the output end of the carrier circuit is connected with the input end of the inverter, the output end of the inverter is connected with the second control end of the two-way analog switch, the output end of the carrier circuit is connected with the first control end of the two-way analog switch, the first input/output end of the two-way analog switch is connected with the input end of the first signal amplification circuit, the first input/output end of the two-way analog switch is connected with a reference level, the second input/output end of the two-way analog switch is connected with the first input/output end of the two-way analog switch, and the second output/input end of the two-way analog switch is connected with the output end of the first voltage follower circuit.
Further, the blood flow velocity detection system further comprises a detector identification circuit, the silicon light detector is connected with the input end of the detector identification circuit, and the output end of the detector identification circuit is connected with the input end of the main control circuit.
The beneficial effects of the invention are as follows:
the invention controls the work of the emitting end of the silicon photodetector by arranging the main control circuit and the switch control circuit, and also arranges the carrier circuit and the first signal amplification control circuit to control the output signal of the first signal amplification circuit, and cooperates with the first filter circuit, the first voltage follower circuit and the first signal amplification circuit to realize blood flow velocity detection, the detection system has simple structure, low requirement on detection operation and strong practicability, can effectively improve the detection efficiency, and overcomes the technical problems of high requirement and low detection efficiency of the ultrasonic Doppler blood flow velocity detection technology in the prior art.
In addition, the blood flow velocity detection signal is further amplified by arranging the second voltage follower circuit, the second signal amplifying circuit and the second filter circuit, so that the signal intensity is improved to improve the accuracy of blood flow velocity detection; the second signal amplification control circuit is also provided to control the output signal magnitude of the second signal amplification circuit.
Drawings
FIG. 1 is a block diagram of one embodiment of a blood flow velocity detection system of the present invention;
FIG. 2 is a circuit diagram of an embodiment of a carrier circuit, a switch control circuit, a first filter circuit, a first voltage follower circuit, a third signal amplifying circuit and a detector identifying circuit according to the present invention;
fig. 3 is a circuit diagram of a specific embodiment of the first signal amplification control circuit, the first signal amplification circuit, the second voltage follower circuit, the second signal amplification control circuit, the second signal amplification circuit, and the second filter circuit of the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
Referring to fig. 1, fig. 1 is a block diagram of a specific embodiment of a blood velocity detection system according to the present invention, where the blood velocity detection system includes a silicon photodetector, a carrier circuit, a switch control circuit, a master control circuit, a first filter circuit, a first voltage follower circuit, a first signal amplifier control circuit for controlling the output signal of the first signal amplifier circuit, a second voltage follower circuit, a second signal amplifier circuit for controlling the output signal of the second signal amplifier circuit, a second filter circuit, a third signal amplifier circuit and a detector identification circuit, where the output end of the carrier circuit is connected to the input end of the switch control circuit, the output end of the master control circuit is connected to the control end of the switch control circuit to control the on/off of the switch control circuit, and further control the operation of the emitting end of the silicon photodetector, the receiving end of the silicon photodetector is connected to the input end of the first filter circuit, the output end of the first filter circuit is connected to the input end of the first voltage follower circuit, and the output end of the first voltage follower circuit is connected to the input end of the first voltage follower circuit; the output end of the first signal amplifying circuit is connected with the input end of the second voltage following circuit, and the output end of the second voltage following circuit is connected with the input end of the second signal amplifying circuit; the output end of the second signal amplifying circuit is connected with the input end of the second filtering circuit, the output end of the second filtering circuit is connected with the input end of the main control circuit, the output end of the first filtering circuit is connected with the input end of the third signal amplifying circuit, and the output end of the third signal amplifying circuit is connected with the input end of the switch control circuit so as to enhance the driving capability of the switch control circuit; the output end of the carrier circuit is connected with the control end of the first signal amplification control circuit, and the output end of the first signal amplification control circuit is connected with the input end of the first signal amplification circuit; the output end of the main control circuit is connected with the control end of the second signal amplification control circuit, and the output end of the second signal amplification control circuit is connected with the input end of the second signal amplification circuit; the silicon photodetector is connected with the input end of the detector identification circuit, the output end of the detector identification circuit is connected with the input end of the main control circuit, and the detector identification circuit is used for identifying whether the silicon photodetector is connected.
The main control circuit and the switch control circuit are arranged to control the work of the emitting end of the silicon photodetector, and the main control circuit can input a control signal to the control end of the switch control circuit to control the conduction of the switch control circuit and further control the work of the emitting end of the silicon photodetector; the carrier circuit and the first signal amplification control circuit are also arranged to control the output signal of the first signal amplification circuit, and the carrier circuit, the first voltage follower circuit and the first signal amplification circuit are matched to acquire a blood flow velocity detection signal, so that blood flow velocity detection is further realized; the detection system is simple in structure, the detection signal emission and the detection signal receiving are realized only by utilizing the silicon photodetector, the received signal is processed to realize the blood flow velocity detection, the requirement on the detection operation is low, the practicability is high, the detection efficiency can be effectively improved, the technical problems that the requirement on the ultrasonic Doppler blood flow velocity detection technology in the prior art is high and the detection efficiency is low are overcome, specifically, the blood flow velocity detection mode of the detection system can be a PPG mode, and the blood flow velocity of a detected person can be obtained by processing the PPG signal. In addition, the blood flow velocity detection signal is further amplified by arranging a second voltage follower circuit, a second signal amplifying circuit and a second filter circuit, so that the signal intensity is improved to improve the accuracy of blood flow velocity detection; the second signal amplification control circuit controlled by the main control circuit is also arranged for controlling the output signal of the second signal amplification circuit. Finally, a detector identification circuit is also arranged to identify whether the silicon light detector is accessed, and the main control circuit can be arranged to start working when the silicon light detector is accessed, so that the energy consumption of the detection system can be saved, and the usable time of the detection system can be prolonged.
Further, the main control circuit includes a processor such as a single chip microcomputer, referring to fig. 2, fig. 2 is a circuit diagram of a specific embodiment of the carrier circuit, the switch control circuit, the first filter circuit, the first voltage follower circuit, the third signal amplifying circuit and the detector identifying circuit of the present invention, the carrier circuit 1 includes an LMC555 timer chip U18, and the carrier circuit 1 generates a square wave clock signal as a carrier. The switch control circuit 2 includes a first switching tube Q20, a second switching tube Q19, a third switching tube Q21 and a first operational amplifier U21A, where the first operational amplifier U21A is a one-way operational amplifier of an LMC64821 chip, the LMC64821 chip is a two-way CMOS operational amplifier, a control end of the first switching tube Q20 is connected to an output end ppg_en (enable end) of the main control circuit, a negative output end of the first switching tube Q20 is connected to an in-phase input end of the first operational amplifier U21A, a positive output end of the first switching tube Q20 is connected to a power +5ana, an output end of the carrier circuit 1 is connected to a control end of the second switching tube Q19 (i.e., an output end of the chip U18 is connected to a control end of the second switching tube Q19 after passing through a resistor R86), a negative output end of the second switching tube Q19 is connected to a power +5ana, a positive output end of the second switching tube Q19 is connected to an in-phase input end ppg_en (enable end) of the main control circuit, a positive output end of the first switching tube Q21A is connected to a positive output end of the first switching tube Q21A through a +5a, and an output end of the third switching tube Q88 is connected to a positive output end of the third switching tube Q21 through a +5a. The switch control circuit 2 controls whether the third switch tube Q21 is conducted or not according to a control signal PPG_EN input by the main control circuit, and further controls whether the emitting end of the silicon photodetector works or not. The first switching tube Q20 is an NPN triode, a base electrode of the NPN triode is a control end of the first switching tube Q20, an emitter electrode of the NPN triode is a negative output end of the first switching tube Q20, and a collector electrode of the NPN triode is a positive output end of the first switching tube Q20. In addition, the second switching tube Q19 and the third switching tube Q21 are PNP transistors, bases of the PNP transistors are control ends of the second switching tube Q19 and the third switching tube Q21, an emitter of the PNP transistors is a negative output end of the second switching tube Q19 and a negative output end of the third switching tube Q21, and a collector of the PNP transistors is a positive output end of the second switching tube Q19 and a positive output end of the third switching tube Q21.
Still further, referring to fig. 2, the first filter circuit 5 is an operational amplifier filter circuit, specifically, the operational amplifier filter circuit includes a third operational amplifier U27, a resistor R109 and a capacitor C115, the U27 adopts an AD8627 high voltage amplifier chip, an inverting input terminal of the U27 is connected with a receiving terminal ppg_v2 of the silicon photodetector, and the first filter circuit 5 is an active high-pass filter circuit for filtering interference signals so as to improve accuracy of a blood velocity detection result. In addition, the first voltage follower circuit 6 includes a fourth operational amplifier U23C, where the U23C adopts an operational amplifier of model LMC6036, to realize that the output voltage follows the input voltage; referring to fig. 3, fig. 3 is a circuit diagram of a specific embodiment of the first signal amplification control circuit, the first signal amplification circuit, the second voltage follower circuit, the second signal amplification control circuit, the second signal amplification circuit, and the second filter circuit according to the present invention, and an output terminal a of the first voltage follower circuit 6 is connected to an input terminal of the first signal amplification circuit 11. Similarly, the second voltage follower circuit 12 has the same structure as the first voltage follower circuit 6, and will not be described again. Furthermore, the first signal amplifying circuit 11 includes an operational amplifier U23D of model LMC6036 for amplifying the input signal, and the output terminal a of the first voltage follower circuit 6 is connected to the inverting output terminal of the operational amplifier U23D. The first signal amplification control circuit 13 includes an inverter U29, a two-way analog switch (i.e., a first analog switch U28A and a second analog switch U28B), the inverter U29 is a schmitt inverter, the two-way analog switch is an analog switch chip with TC4W66F size, an output terminal AA of the carrier circuit 1 is connected to an input terminal of the inverter U29, an output terminal AA of the inverter U29 is connected to a second control terminal (3 pins) of the second analog switch U28B, an output terminal AA of the carrier circuit 1 is connected to a first control terminal (7 pins) of the first analog switch U28A, a first input/output terminal (1 pin) of the first analog switch U28A is connected to a non-inverting input terminal of the operational amplifier U23D, a first output/input terminal (2 pins) of the first analog switch U28A is connected to a reference level p_v_gnd, and the reference level p_v_gnd is provided as a virtual ground by a third operational amplifier U27 via a capacitor C119 and a resistor R119, and a voltage is about 2.5V; the second input/output terminal (5 pins) of the second analog switch U28B is connected to the first input/output terminal (1 pin) of the first analog switch U28A, and the second output/input terminal (6 pins) of the second analog switch U28B is connected to the output terminal a of the first voltage follower circuit 6. Specifically, the clock signal AA output by the carrier circuit 1 is used as a gating signal of two analog switches U28A and U28B, and controls the switching nodes D2 and S2 of the analog switches to be turned off and on, so as to control the level of the 12 pin of the operational amplifier U23D, and further control the output signal of the operational amplifier U23D.
Referring to fig. 2 and 3, the second signal amplifying circuit 8 includes an operational amplifier U20A and a resistor R87, where the U20A may be implemented by a path of operational amplifier of the LMC64821 chip, and an output terminal of the second voltage follower circuit 12 is connected to a non-inverting input terminal of the operational amplifier U20A. Further, the second signal amplification control circuit includes an amplification factor control circuit and/or an input signal amplitude control circuit, in this embodiment, the second signal amplification control circuit includes an amplification factor control circuit 7 and an input signal amplitude control circuit 10, an output end of the main control circuit is connected to a control end of the amplification factor control circuit 7 and a control end of the input signal amplitude control circuit 10, and an output end of the amplification factor control circuit 7 and an output end of the input signal amplitude control circuit 10 are connected to an input end of the second signal amplification circuit 8.
Specifically, referring to fig. 2 and 3, the amplification factor control circuit 7 includes a first electronic switch, a second electronic switch, a first control resistor R90 and a second control resistor R94, where the first electronic switch and the second electronic switch are implemented by two switches in a PS323 electronic switch chip U19, a first connection end (pin 1 of U19) of the first electronic switch and a first connection end (pin 5 of U19) of the second electronic switch are both connected to an output end of the operational amplifier U20A, a second connection end (pin 2 of U19) of the first electronic switch is connected to one end of the first control resistor R90, a second connection end (pin 6 of U19) of the second electronic switch is connected to one end of the second control resistor R94, the other end of the first control resistor R90 and the other end of the second control resistor R94 are both connected to an inverting input end of the operational amplifier U20A, an output end gain_a of the main control circuit is connected to a control end (pin 7 of U19) of the first electronic switch, and an output end gain_b of the main control circuit is connected to a control end (pin 3 of the second electronic switch) of U19. The main control circuit changes the connection state of the first control resistor R90, the second control resistor R94 and the resistor R87 by controlling the on and off of the U19 electronic switch, namely, whether the two resistors are connected in parallel or the three resistors are connected in parallel is controlled by the R90, the R94 and the R87, so that the amplification factor of the operational amplifier U20A is changed. Further, the input signal amplitude control circuit 10 includes a third electronic switch, a third control resistor R101 and a fourth control resistor R104, where the third electronic switch is implemented by a switch of a chip U22 (i.e., a PS323 chip), a first connection end (pin 1 of U22) of the third electronic switch is connected to the reference level p_v_gnd, a second connection end (pin 2 of U22) of the third electronic switch is connected to one end of the fourth control resistor R104, one end of the third control resistor R101 is connected to the reference level p_v_gnd, the other end of the third control resistor R101 is connected to the other end of the fourth control resistor R104, the other end of the third control resistor R101 is connected to the non-inverting input end of the operational amplifier U20A, and an output end gain_c of the main control circuit is connected to the control end (pin 7 of U22) of the third electronic switch. The third control resistor R101 and the fourth control resistor R04 form a parallel network through a third electronic switch, and the main control circuit can change the amplitude of an input signal of the operational amplifier U20A by controlling the on-off state of the third electronic switch to change the resistance value of the parallel network. In addition, the second filter circuit 9 includes an operational amplifier U20B, where the U20B is implemented by using one path of operational amplifier of the LMC64821 chip, and an output end ppg_wave of the second filter circuit 9 is connected to an input end of the main control circuit.
Further, referring to fig. 1 and 2, the third signal amplifying circuit includes a second operational amplifier U23A and an integrating circuit, the output end of the first filter circuit 5 is connected to the inverting input end of the second operational amplifier U23A, the non-inverting input end of the second operational amplifier U23A is connected to the reference level p_v_gnd, the output end of the second operational amplifier U23A is connected to the input end of the integrating circuit, and the output end of the integrating circuit is connected to the non-inverting input end of the first operational amplifier U21A. The integrating circuit comprises a fifth operational amplifier U21B and a capacitor CX5, the output end of a second operational amplifier U23A is connected with the inverting input end of the fifth operational amplifier U21B through a resistor R106, the second operational amplifier U23A adopts an operational amplifier of LMC6036 model, and the fifth operational amplifier U21B is realized by adopting one path of operational amplifier of an LMC64821 chip; the third signal amplifying circuit amplifies the signal of the receiving end of the silicon photodetector and feeds back the signal to the switch control circuit 2 so as to improve the driving capability of the third switch tube Q21 and enhance the emission signal intensity of the silicon photodetector.
Finally, referring to fig. 2, the detector identifying circuit 4 includes a detector interface J21, a first resistor R105 and a second resistor R108, one end of the first resistor R105 is connected to a power supply +5ana, the other end of the first resistor R105 is connected to one end of the second resistor R108, the other end of the second resistor R108 is connected to an input end ppg_probe of the master control circuit, the other end of the first resistor R105 is connected to a first pin of the detector interface J21, a second pin of the detector interface J21 is grounded, and after the silicon photodetector is inserted into the detector interface J21, the first pin and the second pin are connected to ground the first pin, and the input level of the input end ppg_probe is further pulled down. When the silicon photodetector is not connected to the circuit, the level of the input end PPG_PROBE is high, when the silicon photodetector is connected to the circuit, the signal of the input end PPG_PROBE is pulled down, the main control circuit judges whether the silicon photodetector is connected to the circuit or not by judging the level of the input end PPG_PROBE, and when the silicon photodetector is connected to the circuit, the detection system is controlled to start working, so that the energy consumption can be effectively saved, and the working time of the detection system can be prolonged. Referring to fig. 2, in the present embodiment, the other end of the first resistor R105 is connected to the first pin 5 of the probe interface J21, the second pin 1 of the probe interface J21 is grounded, the third pin 6 of the probe interface J21 is connected to the second pin 1, and after the silicon photodetector is inserted into the probe interface J21, the third pin 6 and the first pin 5 are connected and turned on to ground the first pin 5.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.
Claims (9)
1. The blood flow velocity detection system is characterized by comprising a silicon photodetector, a carrier circuit, a switch control circuit, a main control circuit, a first filter circuit, a first voltage follower circuit, a first signal amplification control circuit and a first signal amplification circuit, wherein the output end of the carrier circuit is connected with the input end of the switch control circuit;
the first signal amplification control circuit comprises an inverter and a double-circuit analog switch, wherein the output end of the carrier circuit is connected with the input end of the inverter, the output end of the inverter is connected with the second control end of the double-circuit analog switch, the output end of the carrier circuit is connected with the first control end of the double-circuit analog switch, the first input/output end of the double-circuit analog switch is connected with the input end of the first signal amplification circuit, the first input/output end of the double-circuit analog switch is connected with a reference level, the second input/output end of the double-circuit analog switch is connected with the first input/output end of the double-circuit analog switch, and the second input/output end of the double-circuit analog switch is connected with the output end of the first voltage follower circuit.
2. The blood flow velocity detection system according to claim 1, further comprising a third signal amplification circuit, an output of the first filter circuit being connected to an input of the third signal amplification circuit, an output of the third signal amplification circuit being connected to an input of the switch control circuit.
3. The blood flow velocity detection system according to claim 1, further comprising a second voltage follower circuit and a second signal amplifier circuit, wherein an output terminal of the first signal amplifier circuit is connected to an input terminal of the second voltage follower circuit, an output terminal of the second voltage follower circuit is connected to an input terminal of the second signal amplifier circuit, and an output terminal of the second signal amplifier circuit is connected to an input terminal of the main control circuit.
4. A blood flow velocity detection system according to claim 3 further comprising a second filter circuit, the output of the second signal amplification circuit being connected to the input of the second filter circuit, the output of the second filter circuit being connected to the input of the master circuit.
5. A blood flow velocity detecting system according to claim 3 further comprising a second signal amplification control circuit for controlling the magnitude of the output signal of the second signal amplification circuit, the output of the master circuit being connected to the control terminal of the second signal amplification control circuit, the output of the second signal amplification control circuit being connected to the input of the second signal amplification circuit.
6. The blood flow velocity detection system according to claim 5, wherein the second signal amplification control circuit comprises an amplification factor control circuit and/or an input signal amplitude control circuit, the output end of the main control circuit is connected to the control end of the amplification factor control circuit and the control end of the input signal amplitude control circuit, and the output end of the amplification factor control circuit and the output end of the input signal amplitude control circuit are connected to the input end of the second signal amplification circuit.
7. The blood flow velocity detection system according to claim 6, wherein the amplification factor control circuit comprises a first electronic switch, a second electronic switch, a first control resistor and a second control resistor, wherein the first connection end of the first electronic switch and the first connection end of the second electronic switch are connected with the output end of the second signal amplification circuit, the second connection end of the first electronic switch is connected with one end of the first control resistor, the second connection end of the second electronic switch is connected with one end of the second control resistor, the other end of the first control resistor and the other end of the second control resistor are connected with the input end of the second signal amplification circuit, and the output end of the main control circuit is connected with the control end of the first electronic switch and the control end of the second electronic switch respectively.
8. The blood flow velocity detection system according to claim 6, wherein the input signal amplitude control circuit includes a third electronic switch, a third control resistor and a fourth control resistor, a first connection terminal of the third electronic switch is connected to a reference level, a second connection terminal of the third electronic switch is connected to one terminal of the fourth control resistor, one terminal of the third control resistor is connected to the reference level, the other terminal of the third control resistor is connected to the other terminal of the fourth control resistor, the other terminal of the third control resistor is connected to an input terminal of the second signal amplification circuit, and an output terminal of the main control circuit is connected to a control terminal of the third electronic switch.
9. The blood flow velocity detection system according to any one of claims 1 to 8 further comprising a detector identification circuit, the silicon photodetector being connected to an input of the detector identification circuit, an output of the detector identification circuit being connected to an input of the master control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910277650.3A CN110037678B (en) | 2019-04-08 | 2019-04-08 | Blood flow velocity detecting system |
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| CN201910277650.3A CN110037678B (en) | 2019-04-08 | 2019-04-08 | Blood flow velocity detecting system |
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| CN110037678A CN110037678A (en) | 2019-07-23 |
| CN110037678B true CN110037678B (en) | 2024-03-22 |
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| CN201910277650.3A Active CN110037678B (en) | 2019-04-08 | 2019-04-08 | Blood flow velocity detecting system |
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