CN212284753U - A transceiver drive circuit supporting multi-channel transceiver integrated ultrasonic transducer - Google Patents
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Abstract
一种支持多路收发一体式超声波换能器的收发驱动电路，包括发送驱动电路和接收驱动电路以及二次电源；所述发送驱动电路包括用于产生高压驱动脉冲的升压驱动模块和与升压驱动模块的输出连接的多路发射切换控制模块，多路发射切换控制模块的输出接至换能器；所述的接收驱动电路包括依次电连接的收发隔离及回波通道选择模块和回波放大与模数转换模块，由换能器回波通道选择模块将需要的换能器回波信号选择输出至回波放大与模数转换进行放大与模数转换后传输至数字芯片端。本实用新型仅使用了同一组升压驱动和接收放大滤波电路，并通过多路控制开关实现不同换能器的分时发射接收通道切换，具有较高的应用性。
A transceiver drive circuit supporting a multi-channel transceiver integrated ultrasonic transducer includes a transmission drive circuit, a reception drive circuit and a secondary power supply; the transmission drive circuit includes a boost drive module for generating high-voltage drive pulses, and a boost drive module for generating high voltage drive pulses. The output of the voltage drive module is connected to a multi-channel transmission switching control module, and the output of the multi-channel transmission switching control module is connected to the transducer; the receiving and driving circuit includes a transceiver isolation and echo channel selection module and an echo channel that are electrically connected in sequence. Amplification and analog-to-digital conversion module, the transducer echo channel selection module selects and outputs the required transducer echo signal to echo amplification and analog-to-digital conversion for amplification and analog-to-digital conversion, and then transmits it to the digital chip end. The utility model only uses the same group of boosting driving and receiving, amplifying and filtering circuits, and realizes the time-sharing transmitting and receiving channel switching of different transducers through multi-channel control switches, which has high applicability.
Description
Technical Field
The utility model discloses a can be used to in multiple measuring device and the professional instrument based on ultrasonic wave, if ultrasonic speed measurement, ultrasonic ranging, ultrasonic imaging etc. mainly relate to simulation and digital circuit technical field, especially relate to a support multichannel receiving and dispatching integral type ultrasonic transducer's receiving and dispatching drive circuit.
Background
Ultrasonic measurement is one of the electronic measurement technologies commonly used at present, the core of the ultrasonic measurement is that an ultrasonic transducer is driven to emit directional ultrasonic waves, the ultrasonic transducer is received by another transducer or the ultrasonic transducer receives weak echo signals, the ultrasonic measurement is amplified and filtered to be used by a post-stage signal processing module for analysis, multiple practical functions such as speed measurement, distance measurement and imaging can be completed, and the ultrasonic measurement is widely applied to various professional instruments and medical equipment.
The currently popular ultrasonic transducer is generally of a transceiving integrated structure, namely, the same signal line is shared in transceiving, the ultrasonic transducer is in a transmitting state when a high-voltage pulse driving signal is applied to the ultrasonic transducer, and is in a receiving state if the high-voltage pulse driving signal is not applied to the ultrasonic transducer, and the whole ultrasonic transducer can normally work only by 1 transceiving signal line and 1 public ground line.
However, in many application fields, in order to ensure sufficient transmitting energy, the driving pulse voltage of the transducer can reach hundreds of V, the amplitude of echo signals is only mV magnitude or even lower, weak echo signals can be reliably identified after being amplified by using a multi-stage linear amplifier, the working voltage of such an amplifier usually does not exceed + -5V, if good transceiving isolation cannot be realized, the high voltage of a transmitting circuit directly burns a receiving amplifying circuit, a transmitting branch belongs to a typical high-voltage line, the quality of a transmitting waveform is not easy to control, even if high-voltage pulses are not output, the high working noise is usually high, and if the noise is directly applied to the receiving branch without processing, the normal echo signals can be directly annihilated.
In addition, many ultrasonic measuring devices include more than one transducer, and if each transducer is provided with an independent boost driving circuit and a multistage amplifying circuit, the design cost and complexity are greatly improved, and the discreteness of the parameters of the used components is not favorable for keeping the consistency of the receiving and transmitting performances of different transducers. In addition, the ultrasonic transceiver circuit contains a large number of analog components, the microprocessor or the programmable logic device which controls the ultrasonic transceiver circuit is a typical digital integrated circuit, and when the ultrasonic transceiver circuit is connected with the ultrasonic transceiver circuit, if special processing is not added, the digital signals and inherent noise in a digital power supply loop are easy to interfere with the normal work of the analog components, so that the measurement precision is reduced, and even the normal work cannot be realized.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, a transmit-receive driving circuit supporting a multi-path transmit-receive integrated ultrasonic transducer is provided.
The purpose of the utility model is realized with the following mode:
a receiving and transmitting drive circuit supporting a multi-path receiving and transmitting integrated ultrasonic transducer comprises a transmitting drive circuit, a receiving drive circuit and a secondary power supply; the transmitting drive circuit comprises a boosting drive module for generating high-voltage drive pulse and a multipath transmitting switching control module connected with the output of the boosting drive module, and the output of the multipath transmitting switching control module is connected to the transducer; the receiving driving circuit comprises a receiving and transmitting isolation and echo channel selection module and an echo amplification and analog-to-digital conversion module which are sequentially and electrically connected, and a transducer echo channel selection module selectively outputs a required transducer echo signal to the echo amplification and analog-to-digital conversion module for amplification and analog-to-digital conversion and then transmits the signal to a digital chip end; the secondary power supply provides required voltage for each circuit chip.
The boost driving module comprises a first switch driving circuit, a totem-pole driving circuit and a boost transformer control circuit which are sequentially and electrically connected; the first switch driving circuit converts an input 3.3V TTL level digital pulse signal into a 5V level and inputs the 5V level digital pulse signal into a driving input end of the totem-pole circuit, a driving output end of the totem-pole circuit is connected to a boosting transformer control circuit, and the boosting transformer control circuit comprises a boosting transformer and an MOS (metal oxide semiconductor) tube for controlling the boosting transformer to work or break.
The multi-path transmitting switching control module comprises N single transmitting switching control modules with the number N equal to that of the transducers, and the transducer transmitting channel enabling control of the N single transmitting switching control modules form a transducer transmitting channel selection signal of the multi-path transmitting switching control module in parallel.
The single emission switching control module comprises a second switch driving circuit consisting of a fourth resistor R4, a fifth resistor R5 and a fifth triode Q5, a totem pole driving circuit consisting of a sixth triode Q6 and a seventh triode Q7, a third switch driving circuit consisting of a sixth resistor R6, a seventh resistor R7 and an eighth triode Q8, a fourth switch driving circuit consisting of an eighth resistor R8, a ninth resistor R9 and a ninth triode Q9, a fifth switch driving circuit consisting of a tenth resistor R10, an eleventh resistor R11 and a thirteenth triode Q10 and an isolating circuit; the base electrode of the fifth triode Q5 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with the transmitting channel enabling of the energy converter, the collector electrode of the fifth triode Q5 is respectively connected with one end of the fifth resistor R5 and the input end of the totem-pole driving circuit, and the other end of the fifth resistor R5 is connected with the power supply; the output end of the totem pole circuit is connected with one end of a sixth resistor R6, the other end of the sixth resistor R6 is connected with the base of an eighth triode Q8, the emitter of the eighth triode Q8 is grounded, the collector of the eighth triode Q8 is respectively connected with one ends of a seventh resistor R7 and an eighth resistor R8, the other end of the seventh resistor R7 is connected with high-voltage pulse drive, the other end of the eighth resistor R8 is connected with the base of a ninth triode Q9, the emitter of the ninth triode Q9 is connected with high-voltage pulse drive, the collector of the ninth triode Q9 is respectively connected with one ends of a ninth resistor R9 and a tenth resistor R10, the other end of the tenth resistor R10 is connected with the base of a thirteenth diode Q10, the emitter of the thirteenth diode Q10 is respectively connected with the input of the isolation circuit and one end of an eleventh resistor R11, and the other end of the eleventh resistor R11 and the other end of the ninth resistor R9 are connected with.
The receiving and transmitting isolation and echo channel selection module comprises a multi-channel analog selector, the input of the multi-channel analog selector is connected with the transducer through an isolation module, and the isolation module comprises a resistor connected with a receiving and transmitting common signal of the transducer in series and 2 parallel diodes in opposite directions and connected to an analog ground end.
The echo amplification and analog-to-digital conversion module amplifies and converts a weak echo signal and comprises a 2-stage amplification circuit, an active band-pass filter and an analog-to-digital conversion chip which are sequentially and electrically connected; the 2-stage amplification circuit is formed by cascading 2-stage proportional operational amplification circuits, and the amplification gain is controlled by a potentiometer.
The utility model has the advantages that: compared with the prior art, the utility model discloses external control interface input and echo signal output all adopt the most common 3.3V TTL digital IO level, can with lug connection such as MCU, FPGA, inside then strictly divide into low pressure analog circuit part, high-pressure analog circuit part and digital circuit part, and digit ground, low pressure simulation ground, high-pressure simulation ground are strictly divided to adopt single-point ground's mode to realize that all ground wires are received public ground wire on the circuit board. In the design of a transmitting and receiving circuit, the same group of boosting driving and receiving amplifying filter circuits are only used, time-sharing transmitting and receiving channel switching of different transducers is realized through a multi-path control switch, good transmitting and receiving isolation is realized by connecting a plurality of diodes in series between a transmitting circuit and a receiving circuit, and the transmitting and receiving circuit has high applicability.
Drawings
Fig. 1 is a block diagram of the overall structure of the present invention.
Fig. 2 is an internal structure view of the secondary power supply.
Fig. 3 is a circuit diagram of the boost driving module of the present invention.
Fig. 4 is a circuit diagram of the single emitting switching control module of the present invention.
Fig. 5 is a circuit diagram of the transceiver isolation and echo channel selection module of the present invention.
Fig. 6 is a circuit diagram of the echo amplifying and analog-to-digital converting module of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and may be fixedly connected, or may be integrally connected or detachably connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
A receiving and transmitting drive circuit supporting a multi-path receiving and transmitting integrated ultrasonic transducer comprises a transmitting drive circuit, a receiving drive circuit and a secondary power supply; the transmitting drive circuit comprises a boosting drive module for generating high-voltage drive pulse and a multipath transmitting switching control module connected with the output of the boosting drive module, and the output of the multipath transmitting switching control module is connected to the transducer; the receiving driving circuit comprises a receiving and transmitting isolation and echo channel selection module and an echo amplification and analog-to-digital conversion module which are sequentially and electrically connected, and a transducer echo channel selection module selectively outputs a required transducer echo signal to the echo amplification and analog-to-digital conversion module for amplification and analog-to-digital conversion and then transmits the signal to a digital chip end; the secondary power supply provides required voltage for each circuit chip.
The boost driving module comprises a first switch driving circuit, a totem-pole driving circuit and a boost transformer control circuit which are sequentially and electrically connected; the first switch driving circuit converts an input 3.3V TTL level digital pulse signal into a 5V level and inputs the 5V level digital pulse signal into a driving input end of the totem-pole circuit, a driving output end of the totem-pole circuit is connected to a boosting transformer control circuit, and the boosting transformer control circuit comprises a boosting transformer and an MOS (metal oxide semiconductor) tube for controlling the boosting transformer to work or break.
The multi-path transmitting switching control module comprises N single transmitting switching control modules with the number N equal to that of the transducers, and the transducer transmitting channel enabling control of the N single transmitting switching control modules form a transducer transmitting channel selection signal of the multi-path transmitting switching control module in parallel.
The single emission switching control module comprises a second switch driving circuit consisting of a fourth resistor R4, a fifth resistor R5 and a fifth triode Q5, a totem pole driving circuit consisting of a sixth triode Q6 and a seventh triode Q7, a third switch driving circuit consisting of a sixth resistor R6, a seventh resistor R7 and an eighth triode Q8, a fourth switch driving circuit consisting of an eighth resistor R8, a ninth resistor R9 and a ninth triode Q9, a fifth switch driving circuit consisting of a tenth resistor R10, an eleventh resistor R11 and a thirteenth triode Q10 and an isolating circuit.
The base electrode of the fifth triode Q5 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with the transmitting channel enabling of the energy converter, the collector electrode of the fifth triode Q5 is respectively connected with one end of the fifth resistor R5 and the input end of the totem-pole driving circuit, and the other end of the fifth resistor R5 is connected with the power supply; the output end of the totem pole circuit is connected with one end of a sixth resistor R6, the other end of the sixth resistor R6 is connected with the base of an eighth triode Q8, the emitter of the eighth triode Q8 is grounded, the collector of the eighth triode Q8 is respectively connected with one ends of a seventh resistor R7 and an eighth resistor R8, the other end of the seventh resistor R7 is connected with high-voltage pulse drive, the other end of the eighth resistor R8 is connected with the base of a ninth triode Q9, the emitter of the ninth triode Q9 is connected with high-voltage pulse drive, the collector of the ninth triode Q9 is respectively connected with one ends of a ninth resistor R9 and a tenth resistor R10, the other end of the tenth resistor R10 is connected with the base of a thirteenth diode Q10, the emitter of the thirteenth diode Q10 is respectively connected with the input of the isolation circuit and one end of an eleventh resistor R11, and the other end of the eleventh resistor R11 and the other end of the ninth resistor R9 are connected with.
The receiving and transmitting isolation and echo channel selection module comprises a multi-channel analog selector, the input of the multi-channel analog selector is connected with the transducer through an isolation module, and the isolation module comprises a resistor connected with a receiving and transmitting common signal of the transducer in series and 2 parallel diodes in opposite directions and connected to an analog ground end.
The echo amplification and analog-to-digital conversion module amplifies and converts a weak echo signal and comprises a 2-stage amplification circuit, an active band-pass filter and an analog-to-digital conversion chip which are sequentially and electrically connected; the 2-stage amplification circuit is formed by cascading 2-stage proportional operational amplification circuits, and the amplification gain is controlled by a potentiometer.
As shown in fig. 1, the utility model discloses by secondary power supply, boost drive module, multichannel transmission switching control module, receiving and dispatching keep apart and echo channel selection module, echo amplification and analog-to-digital conversion module constitute. The external power supply is a 12V direct current power supply, the transmitting drive, the transducer transmitting channel selection and the transducer receiving channel selection are all input signals of 3.3V TTL digital IO level, time-sharing receiving and transmitting control of a plurality of groups of ultrasonic transducers can be supported, and the amplified echo signal digital quantity is directly output in the form of 3.3V TTL digital IO.
As shown in fig. 2, the present invention designs a secondary power module, which inputs a single 12V low-quality dc power, and outputs 4 power supplies with different purposes and quality grades, wherein the first output is a 12V power supply which directly outputs the 12V input after the waveform is improved by a voltage regulator tube, and is used as an intermediate power supply of a voltage boost module; the second output is 3.3V digital power output by the switching power supply and used for digital IO power of the analog-to-digital conversion chip; the third and fourth outputs are analog power supplies, and are mainly used for amplifying small signals, the requirement on power supply quality is high, so a linear power supply is needed to be used for generating, but the linear power supply has low working efficiency when the voltage difference between the input and the output is large, so an input 12V power supply firstly passes through another switch power supply to generate an intermediate power supply with slightly low voltage, and then 2 groups of linear power supplies output low-ripple analog power supply +5V and low-ripple analog power supply-5V. The 4 paths of power supply output of the secondary power supply are provided with independent power supply return wires (namely ground wires), different ground wires are connected through an inductor to realize final common ground, and good isolation of the different ground wires is guaranteed.
As shown in fig. 3, the main function of the boost driving module of the present invention is to generate high voltage transmitting pulse, the input of which is 3.3V TTL level digital pulse signal, the output is peak-to-peak (hereinafter abbreviated as Vpp) up to hundreds V high voltage pulse, the internal structure is as shown in fig. 3, wherein the transistor and the MOS transistor are all operated in on-off state, R1, R2, Q1 constitute the 1 st level switch driving circuit, and complete the level conversion from 3.3V to 5V, Q2 and Q3 constitute a pair of totem pole driving circuit, Q4 is used to control the operation/disconnection of the boost transformer, and the specific working process is explained as follows:
when the emission pulse is low (0V), Q1 is turned off, and the collector level of Q1 is +5V due to the presence of pull-up resistor R2, which causes Q2 to turn on, and further causes the gate voltage of Q4 to be pulled up to + 5V. When the emission pulse is high (3.3V), Q1 is saturated and turned on, so that the collector level of Q1 is close to 0V, which cannot turn on Q2, but due to the effect of the charging effect of the junction capacitor of Q4, Q3 is saturated and turns on and discharges the capacitor rapidly, so that the gate voltage of Q4 is pulled down to 0V.
Therefore, when the emission pulse is rapidly inverted between 3.3V and 0V, the gate of Q4 will generate a rapid switching pulse in the opposite direction, as long as the gate voltage is greater than the turn-on voltage Vgs of the MOS transistor, the drain of the MOS transistor can be rapidly switched between +12V and 0V, that is, a control pulse with Vpp of 12V is generated, the control pulse is boosted by a step-up transformer to generate a high-voltage pulse, the step-up ratio of the step-up transformer can be selected according to practical situations, for example, a 1:30 step-up transformer is selected, and the boosted pulse Vpp can reach 12 × 30= 360V.
When need use a plurality of transducer timesharing during operation in the design, directly adopt a plurality of drive module that steps up although simple and convenient, but need use a plurality of step up transformers, and the transformer is bulky usually, be difficult to miniaturize and the cost is higher, accessible for this reason the utility model discloses well multichannel transmission switching control module realizes the sharing to the drive module that steps up, different according to shared transducer quantity N, directly with this module duplicate N can, the module is inside only to contain cheap triode and resistance components and parts, the construction cost is far less than the drive module that steps up, its inner structure is as shown in figure 4, wherein control signal is 3.3V TTL digital control signal "transducer transmission passageway enables control", the low level is effective, input high-voltage pulse drive comes from the drive module that steps up, output then connects to the transducer.
The working process is as follows: when the emission channel of the transducer is controlled to be in a low level and the high-voltage pulse drive is in a high-voltage state, the Q5 is cut off, the Q6 and the Q7 still form totem pole drive and output 12V high level, further the Q8 and the Q9 are conducted, the collector of the Q9 also outputs high level, the Q10 is conducted, and the emitter of the Q10 also outputs a high-voltage signal. When the transducer emission channel enable control signal is in a high level, Q5 is conducted, the totem pole drive outputs 0V, so that Q8 is cut off, at the moment, even if the high-voltage pulse drive is in a high-voltage state, Q9 and Q10 cannot be conducted, and the emission pole of Q10 is 0V.
The D3-D4 diodes are mainly used for improving the transceiving isolation effect, the conducting voltage of a single diode is about 0.7V, D1 and D2 can be turned on only when the emitter of Q10 exceeds the terminal voltage of the transducer by 1.4V, otherwise D3 and D4 can be turned on only when the terminal voltage of the transducer exceeds the emitter of Q10 by 1.4V, Q10 only has two level states of high voltage and 0V, so that D1 and D2 are turned on when Q10 is at high voltage, high-voltage pulse drive directly reaches the transducer end, the transducer is in a receiving state when Q10 is at 0V, D3 and D4 can be turned on only when the echo signal of the transducer is more than 1.4V, the echo energy of the transducer is usually only in the mV magnitude, and D3 and D4 can only be in a cut-off state, so that the transmitting part and the receiving part of the transducer can be effectively isolated.
If N transducers need to be controlled in a time-sharing mode, the circuit of FIG. 4 is copied by N parts, transducer transmitting channel selection signals of the whole circuit are formed in parallel by enabling and controlling transducer transmitting channels of each module, a transmitting branch of each transducer can be opened only by setting a certain bit of the signals to be low level, and specific high-voltage transmitting signals are generated by the boosting module and shared among the transducers.
The transducer is a transceiver integrated structure, so that the normal operation of a receiving loop cannot be influenced when the transducer is in a high-voltage transmitting state, which is the main function of a transceiver isolation and echo channel selection module. As shown in fig. 5, taking the example of supporting the reception of echo signals of 3 transducers, and the internal structure of the module is shown in fig. 5, it can be seen that the transmitting and receiving common signals of each transducer are connected to the analog ground terminal through a series resistor and 2 parallel diodes with opposite directions, so that even when the transducer is in a high-voltage transmitting state, the level reaching the analog channel selector terminal does not exceed 0.7V at most due to the clamping effect of the diodes. When the transducer is in a receiving state, the echo energy is only in mV magnitude, and at the moment, the corresponding 2 parallel diodes are in a cut-off state, so that an echo signal can smoothly reach the analog channel selector through the series resistor and the blocking capacitor, and the receiving channel of the transducer selects and outputs the desired transducer echo signal to the echo amplifying and analog-to-digital conversion module.
The echo amplification and analog-to-digital conversion module is used for realizing amplification and analog-to-digital conversion of weak echo signals, and the internal structure of the echo amplification and analog-to-digital conversion module is shown in fig. 6 and mainly comprises a 2-stage amplification circuit, a band-pass filter and an analog-to-digital conversion device. According to different practical working environments, the amplification gain and the amplification stage number can be flexibly selected within a certain range, the implementation case adopts cascade connection of 2-stage proportional operational amplification circuits, the amplification gain is controlled by a potentiometer, and attention is paid to the fact that the operational amplifier meets the requirement of a sufficient gain bandwidth product, if the operational amplifier is used for a 200KHz ultrasonic transducer, single-stage amplification is carried out by 100 times, the fact means that at least broadband operational amplification with the gain bandwidth product of 20MHZ is required to be selected.
The main purpose of the active band pass filter is to filter out-of-band noise, thereby effectively suppressing interference, providing a detection signal-to-noise ratio, and an integrated analog filter chip such as MAX275 may be used. After being amplified and filtered and output by the 2-stage amplifier, the digital signals are converted to a digital domain by the analog-to-digital conversion chip, and then the digital signals can be directly connected with a common digital chip, and the sampling rate of the analog-to-digital conversion chip needs to meet the sampling theorem.
The module needs a secondary power supply to provide + -5V analog power for the amplifier, the filter and the analog part of the analog-to-digital conversion device, and needs a path of 3.3V digital power to provide the digital IO power of the analog-to-digital conversion device.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and changes may be made without inventive changes in the technical solutions of the present invention.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093196A (en) * | 2021-03-25 | 2021-07-09 | 信阳师范学院 | Transmit-receive integrated ultrasonic precise range finder and range finding method |
| CN114217090A (en) * | 2021-12-07 | 2022-03-22 | 中国科学院大学 | Sensor control device, ultrasonic velocimeter and ultrasonic velocimetry system |
| CN115371749A (en) * | 2022-08-29 | 2022-11-22 | 西安安森智能仪器股份有限公司 | Echo signal receiving channel switching circuit and method of multi-channel ultrasonic flowmeter |
| CN118833676A (en) * | 2024-07-25 | 2024-10-25 | 森明工业(苏州)有限公司 | Control system and method for wide ultrasonic equipment for deviation correction of film coiled material |
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2020
- 2020-04-29 CN CN202020689859.9U patent/CN212284753U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093196A (en) * | 2021-03-25 | 2021-07-09 | 信阳师范学院 | Transmit-receive integrated ultrasonic precise range finder and range finding method |
| CN114217090A (en) * | 2021-12-07 | 2022-03-22 | 中国科学院大学 | Sensor control device, ultrasonic velocimeter and ultrasonic velocimetry system |
| CN114217090B (en) * | 2021-12-07 | 2022-09-23 | 中国科学院大学 | Sensor control device, ultrasonic velocimeter and ultrasonic velocimetry system |
| CN115371749A (en) * | 2022-08-29 | 2022-11-22 | 西安安森智能仪器股份有限公司 | Echo signal receiving channel switching circuit and method of multi-channel ultrasonic flowmeter |
| CN118833676A (en) * | 2024-07-25 | 2024-10-25 | 森明工业(苏州)有限公司 | Control system and method for wide ultrasonic equipment for deviation correction of film coiled material |
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