CN116448216A - Program-controlled ultrasonic liquid level meter transmitting circuit, receiving circuit and ranging system - Google Patents
Program-controlled ultrasonic liquid level meter transmitting circuit, receiving circuit and ranging system Download PDFInfo
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- CN116448216A CN116448216A CN202310616978.XA CN202310616978A CN116448216A CN 116448216 A CN116448216 A CN 116448216A CN 202310616978 A CN202310616978 A CN 202310616978A CN 116448216 A CN116448216 A CN 116448216A
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- 239000007788 liquid Substances 0.000 title abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 99
- 238000010277 constant-current charging Methods 0.000 claims description 21
- 238000005070 sampling Methods 0.000 claims description 13
- 102000003729 Neprilysin Human genes 0.000 claims description 12
- 108090000028 Neprilysin Proteins 0.000 claims description 12
- 238000007600 charging Methods 0.000 claims description 12
- 238000004146 energy storage Methods 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 8
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- 238000001514 detection method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 6
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The application discloses program-controlled ultrasonic liquid level meter transmitting circuit, receiving circuit and ranging system relates to the ultrasonic wave technical field. The specific implementation scheme is as follows: the signal processing unit is used for receiving the voltage signal converted by the acoustic wave signal and amplifying and detecting the voltage signal, the pulse signal generated by the single chip microcomputer is amplified by the transmitting circuit and then is sent to the transducer to generate the acoustic wave, the transducer converts the electrical signal into the acoustic wave to radiate out and converts the returned acoustic wave into the electrical signal, and the single chip microcomputer sends the processed signal to the communication output module. The ultrasonic liquid level receiving and transmitting circuit improves the quality of received signals through adjustment of the transmitting level and multiple change of the receiving amplifying circuit, so that the stability of ultrasonic measurement is better.
Description
Technical Field
The application relates to the technical field of ultrasonic waves, in particular to a program-controlled ultrasonic liquid level meter transmitting circuit, a program-controlled ultrasonic liquid level meter receiving circuit and a program-controlled ultrasonic liquid level meter ranging system.
Background
In the industrial site of ultrasonic liquid level measurement, the transceiver control circuit transmits pulse signals with fixed number according to the working frequency of the probe, and filters, amplifies and detects the received small signals. Due to the influence of the installation environment, the liquid level disturbance fluctuates in the liquid level measurement, or the reflected signal is attenuated due to the existence of bubbles on the liquid level, so that the amplitude of the received signal is low, and erroneous judgment is caused. In addition, when other interference objects exist between the measured liquid surface and the probe, erroneous judgment may occur if the reflected signal is too large.
Disclosure of Invention
Based on this, this application provides a program control ultrasonic liquid level meter transmitting circuit, receiving circuit and ranging system for solving the current poor problem of ultrasonic measurement stability.
In a first aspect of the present application, there is provided a programmed ultrasonic level gauge transmit circuit comprising:
the device comprises a constant current charging module, an ADC sampling module and a pulse receiving and transmitting control module;
the constant current charging module charges the energy storage capacitor, and when the ultrasonic signal is not transmitted, the voltage charged on the energy storage capacitor is equal to the input voltage;
during constant-current charging, the ADC sampling module is utilized to sample charging voltage in real time, and when the charging voltage reaches a set threshold value, the ultrasonic pulse transmitting of the pulse receiving and transmitting control module is started;
after the ultrasonic pulse emission is started, the voltage on the energy storage capacitor of the constant current charging module can be pulled down, the emission circuit enters the charging process again, and the singlechip dynamically adjusts the charging voltage threshold value based on the amplitude of the voltage signal received by the previous ultrasonic wave.
The constant current charging module comprises a constant current chip U1, a first diode D6, a second diode D7, a voltage stabilizing diode D15, a first capacitor CD5 and a second capacitor CD10, wherein one end of the first diode D6 is connected with pins 2, 3, 6 and 7 of the constant current chip U1, the other end of the first diode D6 is connected with the second diode D7, one end of the voltage stabilizing diode D15 is connected with the second diode D7, the other end of the voltage stabilizing diode D15 is grounded, the first capacitor CD5 and the second capacitor CD10 are connected in parallel, and the first capacitor CD5 and the second capacitor CD10 are also connected in parallel at two ends of the voltage stabilizing diode D15.
The constant current charging module further comprises a third resistor R11 and a fourth resistor R12, one end of the third resistor R11 is connected with pins 2, 3, 6 and 7 of the constant current chip U1, the other end of the third resistor R11 is intersected with the fourth resistor R12 at one point and is connected with pin 1 of the constant current chip U1, and the other end of the fourth resistor R12 is intersected with a connecting line between the first diode D6 and the second diode D7.
The ADC sampling module comprises an embedded ADC of the single chip microcomputer and a second resistor R10, one end of the second resistor R10 is connected with the positive electrode of the second capacitor CD10 and the 1 pin of the transformer T3, the other end of the second resistor R10 is connected with the embedded ADC of the single chip microcomputer, one end of a fifth resistor R13 is intersected with a connecting line between the second resistor R10 and the embedded ADC of the single chip microcomputer at one point, and the other end of the fifth resistor R13 is grounded.
The 5 foot of the transformer T3 is connected with the source electrode of the MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with a sixth resistor R14 and a seventh resistor R15, the other end of the sixth resistor R14 is connected with the output end of the pulse receiving and transmitting control module, the other end of the seventh resistor R15 is connected with the drain electrode of the MOS tube Q1, and the drain electrode of the MOS tube Q1 is grounded.
The third capacitor C7 is connected in parallel with the first resistor R9, the 9 pin of the transformer T3 is connected with the third capacitor C7 and the first resistor R9, the 6 pin of the transformer T3 is connected with the anode of the third diode D17 and the cathode of the fourth diode D18, and the cathode of the third diode D17 and the anode of the fourth diode D18 are connected with the third capacitor C7 and the first resistor R9.
In a second aspect of the present application, there is provided a programmable ultrasonic level gauge receiving circuit comprising: a plurality of resistors, a plurality of capacitors, and an operational amplifier U7;
the plurality of resistors comprise an eighth resistor R16 and a thirteenth resistor R33, and the plurality of capacitors comprise a fourth capacitor C8, a sixth capacitor C14, a seventh capacitor C15, an eighth capacitor C16 and a ninth capacitor C17;
one end of a sixth capacitor C14 is connected with an input signal of the transducer, the other end of the sixth capacitor C14 is connected with a thirteenth resistor R33, one end of a seventh capacitor C15 is connected with the other end of the thirteenth resistor R33, the other end of the seventh capacitor C15 is connected with an inverted input end of an operational amplifier U7, the input voltage of a non-inverting input end of the operational amplifier U7 is VCC/2, an output end of the operational amplifier U7 is connected with an eighth capacitor C16 and a ninth capacitor C17, a 4 pin of the operational amplifier U7 is grounded, an 8 pin of the operational amplifier U7 is grounded at a high level, the other end of the eighth capacitor C16 is connected with a detection circuit, and the other end of the ninth capacitor C17 is grounded;
one end of the eighth resistor R16 is grounded, the other end of the eighth resistor R16 is connected with one end of the fourth capacitor C8, the other end of the eighth resistor R16 is also connected with the other end of the thirteenth resistor R33, and the other end of the fourth capacitor C8 is connected with the output end of the operational amplifier U7.
The resistors further comprise a ninth resistor R17, a tenth resistor R18, an eleventh resistor R21 and a twelfth resistor R25, one ends of the ninth resistor R17, the tenth resistor R18, the eleventh resistor R21 and the twelfth resistor R25 are connected with the output end of the operational amplifier U7, and the other ends of the ninth resistor R17, the tenth resistor R18, the eleventh resistor R21 and the twelfth resistor R25 are respectively connected with pins 12, 14, 15 and 11 of the analog switch control chip U5.
A fifth capacitor C13 is connected between the 16 pin and the 6 pin of the analog switch control chip U5, one end of the fifth capacitor C13 is connected with the power supply voltage, the other end of the fifth capacitor C13 is grounded, and the 7 pin and the 8 pin of the analog switch control chip U5 are also grounded.
A third aspect of the present application provides a programmed ultrasonic ranging system comprising: the signal processing unit is used for receiving the voltage signal converted by the acoustic wave signal and amplifying and detecting the voltage signal, the pulse signal generated by the single chip microcomputer is amplified by the transmitting circuit and then is sent to the transducer to generate the acoustic wave, the transducer converts the electrical signal into the acoustic wave to radiate out and converts the returned acoustic wave into the electrical signal, and the single chip microcomputer sends the processed signal to the communication output module.
The beneficial effects are that: the ultrasonic liquid level receiving and transmitting circuit can actively improve the quality of received signals through adjustment of the transmitting level and multiple change of the receiving and amplifying circuit, can also improve the application range of the ultrasonic circuit in the application of liquid level measurement, and ensures that the stability of ultrasonic measurement is better.
It should be understood that the description of this section is not intended to identify key or critical features of the embodiments of the application or to delineate the scope of the application. Other features of the present application will become apparent from the description that follows.
Drawings
The drawings are for better understanding of the present solution and do not constitute a limitation of the present application. Wherein:
FIG. 1 is a transmit circuit diagram provided in accordance with the present application;
fig. 2 is a receiving circuit diagram provided in accordance with the present application;
FIG. 3 is a block diagram of a system provided in accordance with the present application;
FIG. 4 is a voltage timing diagram of a constant current charging circuit provided in accordance with the present application;
FIG. 5 is a graph of an ultrasonic gain control pre-comparison provided in accordance with the present application;
fig. 6 is a comparison graph after ultrasonic gain control provided in accordance with the present application.
Detailed Description
Exemplary embodiments of the present application are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present application to facilitate understanding, and should be considered as merely exemplary. Accordingly, one of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
In a first aspect of the present application, there is provided a programmed ultrasonic level gauge transmit circuit comprising:
the constant current charging module 101, the ADC sampling module 102 and the pulse receiving and transmitting control module are shown in fig. 1;
the constant current charging module 101 charges the energy storage capacitor, and when the ultrasonic signal is not transmitted, the voltage charged on the energy storage capacitor is equal to the input voltage;
during constant current charging, the ADC sampling module 102 is utilized to sample the charging voltage in real time, and when the charging voltage reaches a set threshold value, the ultrasonic pulse emission of the pulse receiving and transmitting control module is started;
after the ultrasonic pulse emission is started, the voltage on the energy storage capacitor of the constant current charging module 101 is pulled down, the emission circuit enters the charging process again, and the singlechip dynamically adjusts the charging voltage threshold value based on the amplitude of the voltage signal received by the previous ultrasonic wave.
The constant current charging module 101 includes a constant current chip U1, a first diode D6, a second diode D7, a zener diode D15, a first capacitor CD5, and a second capacitor CD10, where one end of the first diode D6 is connected to pins 2, 3, 6, and 7 of the constant current chip U1, the other end of the first diode D6 is connected to the second diode D7, one end of the zener diode D15 is connected to the second diode D7, the other end of the zener diode D15 is grounded, the first capacitor CD5 and the second capacitor CD10 are connected in parallel, and the first capacitor CD5 and the second capacitor CD10 are also connected in parallel to two ends of the zener diode D15.
The constant current charging module 101 further comprises a third resistor R11 and a fourth resistor R12, one end of the third resistor R11 is connected with pins 2, 3, 6 and 7 of the constant current chip U1, the other end of the third resistor R11 intersects with the fourth resistor R12 at one point and is connected with pin 1 of the constant current chip U1, and the other end of the fourth resistor R12 intersects with a connecting line between the first diode D6 and the second diode D7.
Specifically, the constant current chip U1 adopts a chip signal LM334MX.
The ADC sampling module 102 includes a built-in ADC of the single-chip microcomputer and a second resistor R10, one end of the second resistor R10 is connected to the positive pole of the second capacitor CD10 and the 1 pin of the transformer T3, the other end of the second resistor R10 is connected to the built-in ADC of the single-chip microcomputer, one end of the fifth resistor R13 intersects with a connection line between the second resistor R10 and the built-in ADC of the single-chip microcomputer at a point, and the other end of the fifth resistor R13 is grounded.
Specifically, the transformer T3 is a transformer with a signal EF12.6-3 mH.
The 5 foot of the transformer T3 is connected with the source electrode of the MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with a sixth resistor R14 and a seventh resistor R15, the other end of the sixth resistor R14 is connected with the output end of the pulse receiving and transmitting control module, the other end of the seventh resistor R15 is connected with the drain electrode of the MOS tube Q1, and the drain electrode of the MOS tube Q1 is grounded.
The third capacitor C7 is connected in parallel with the first resistor R9, the 9 pin of the transformer T3 is connected with the third capacitor C7 and the first resistor R9, the 6 pin of the transformer T3 is connected with the anode of the diode D17 and the cathode of the fourth diode D18, and the cathode of the diode D17 and the anode of the fourth diode D18 are connected with the third capacitor C7 and the first resistor R9.
The voltage regulator diode D15 regulates the maximum voltage of constant current charging by utilizing the third resistor R11 and the fourth resistor R12 to regulate the magnitude of constant current output current.
In a second aspect of the present application, there is provided a programmable ultrasonic level gauge receiving circuit comprising: a plurality of resistors, a plurality of capacitors, and an operational amplifier U7, as shown in fig. 2:
the plurality of resistors comprise an eighth resistor R16 and a thirteenth resistor R33, and the plurality of capacitors comprise a fourth capacitor C8, a sixth capacitor C14, a seventh capacitor C15, an eighth capacitor C16 and a ninth capacitor C17;
one end of a sixth capacitor C14 is connected with an input signal of the transducer, the other end of the sixth capacitor C14 is connected with a thirteenth resistor R33, one end of a seventh capacitor C15 is connected with the other end of the thirteenth resistor R33, the other end of the seventh capacitor C15 is connected with an inverted input end of an operational amplifier U7, the input voltage of a non-inverting input end of the operational amplifier U7 is VCC/2, an output end of the operational amplifier U7 is connected with an eighth capacitor C16 and a ninth capacitor C17, a 4 pin of the operational amplifier U7 is grounded, an 8 pin of the operational amplifier U7 is grounded at a high level, the other end of the eighth capacitor C16 is connected with a detection circuit, and the other end of the ninth capacitor C17 is grounded;
one end of the eighth resistor R16 is grounded, the other end of the eighth resistor R16 is connected with one end of the fourth capacitor C8, the other end of the eighth resistor R16 is also connected with the other end of the thirteenth resistor R33, and the other end of the fourth capacitor C8 is connected with the output end of the operational amplifier U7.
The resistors further comprise a ninth resistor R17, a tenth resistor R18, an eleventh resistor R21 and a twelfth resistor R25, one ends of the ninth resistor R17, the tenth resistor R18, the eleventh resistor R21 and the twelfth resistor R25 are connected with the output end of the operational amplifier U7, and the other ends of the ninth resistor R17, the tenth resistor R18, the eleventh resistor R21 and the twelfth resistor R25 are respectively connected with pins 12, 14, 15 and 11 of the analog switch control chip U5.
The analog switch control chip U5 is connected with a feedback section of the operational amplifier U7 through a ninth resistor R17, a tenth resistor R18, an eleventh resistor R21 and a twelfth resistor R25, and can change the amplification factor of the operational amplifier.
The operational amplifier U7 adopts the signal GS8592-SR, and the signal of the analog switch control chip U5 is 74HC4052D.
A fifth capacitor C13 is connected between the 16 pin and the 6 pin of the analog switch control chip U5, one end of the fifth capacitor C13 is connected with the power supply voltage, the other end of the fifth capacitor C13 is grounded, and the 7 pin and the 8 pin of the analog switch control chip U5 are also grounded.
The receiving circuit receives the ultrasonic pulse signal and amplifies the ultrasonic pulse signal by using the 2-stage operational amplifier, and the receiving circuit switches the analog switch to different gears and changes the resistance value of the operational amplifier connection so as to realize the adjustment of the receiving gain.
A third aspect of the present application provides a programmed ultrasonic ranging system comprising: the signal processing unit of the singlechip is used for receiving the voltage signal converted by the acoustic wave signal, regulating, amplifying and detecting the voltage signal, amplifying and then sending the pulse signal generated by the singlechip to the transducer to generate the acoustic wave, converting the electrical signal into the acoustic wave, radiating the acoustic wave and converting the acoustic wave back into the electrical signal by the transducer, and sending the processed signal to the communication output module by the singlechip, as shown in fig. 3.
Fig. 4 is a voltage timing chart of the constant current charging circuit, wherein the threshold 1 is 15V, the threshold 2 is 10V, when the voltage reaches 15V, the emission level amplitude of the transducer is high, the emission power of the transducer is high, but the sampling interval time is long, and when the threshold voltage is set to 10V, the emission level amplitude of the transducer is reduced relative to 15V, but the sampling interval is short. The algorithm strategy is to give priority to signal amplitude, and to reduce sampling interval time after the amplitude meets the requirement. The liquid level measuring device has the beneficial effects that on the premise that the measured data are stable, the sampling speed is increased, so that the instrument can respond to the change of the liquid level more quickly.
Fig. 5 and 6 are front-back comparison diagrams of ultrasonic gain control, wherein an interfering object is arranged near 1000mm of an abscissa, an actual effective reflecting surface is arranged near 1600mm, and when a receiving signal is too large, the intensity of the reflected signal of the interfering object is too large, so that the judgment of a real signal is affected. By reducing the received signal gain, the true signal can be more effectively distinguished.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another apparatus, or some features may be omitted or not performed.
The units may or may not be physically separate, and the components shown as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The present invention is not limited to the above embodiments, and any changes or substitutions within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. A programmable ultrasonic level meter transmitting circuit, comprising: the device comprises a constant current charging module, an ADC sampling module and a pulse receiving and transmitting control module;
the constant current charging module charges the energy storage capacitor, and when the ultrasonic signal is not transmitted, the voltage charged on the energy storage capacitor is equal to the input voltage;
during constant-current charging, the ADC sampling module is utilized to sample charging voltage in real time, and when the charging voltage reaches a set threshold value, the ultrasonic pulse transmitting of the pulse receiving and transmitting control module is started;
after the ultrasonic pulse emission is started, the voltage on the energy storage capacitor of the constant current charging module can be pulled down, the emission circuit enters the charging process again, and the singlechip dynamically adjusts the charging voltage threshold value based on the amplitude of the voltage signal received by the previous ultrasonic wave.
2. The programmable ultrasonic level meter transmitting circuit of claim 1, wherein: the constant current charging module comprises a constant current chip U1, a first diode D6, a second diode D7, a voltage stabilizing diode D15, a first capacitor CD5 and a second capacitor CD10, wherein one end of the first diode D6 is connected with pins 2, 3, 6 and 7 of the constant current chip U1, the other end of the first diode D6 is connected with the second diode D7, one end of the voltage stabilizing diode D15 is connected with the second diode D7, the other end of the voltage stabilizing diode D15 is grounded, the first capacitor CD5 and the second capacitor CD10 are connected in parallel, and the first capacitor CD5 and the second capacitor CD10 are also connected in parallel at two ends of the voltage stabilizing diode D15.
3. A programmable ultrasonic level meter transmitting circuit as defined in claim 2, wherein: the constant current charging module further comprises a third resistor R11 and a fourth resistor R12, one end of the third resistor R11 is connected with pins 2, 3, 6 and 7 of the constant current chip U1, the other end of the third resistor R11 is intersected with the fourth resistor R12 at one point and is connected with pin 1 of the constant current chip U1, and the other end of the fourth resistor R12 is intersected with a connecting line between the first diode D6 and the second diode D7.
4. A programmable ultrasonic level meter transmitting circuit according to claim 3, characterized in that: the ADC sampling module comprises an embedded ADC of the single chip microcomputer and a second resistor R10, one end of the second resistor R10 is connected with the positive electrode of the second capacitor CD10 and the 1 pin of the transformer T3, the other end of the second resistor R10 is connected with the embedded ADC of the single chip microcomputer, one end of a fifth resistor R13 is intersected with a connecting line between the second resistor R10 and the embedded ADC of the single chip microcomputer at one point, and the other end of the fifth resistor R13 is grounded.
5. The programmable ultrasonic level meter transmitting circuit of claim 4, wherein: the 5 foot of the transformer T3 is connected with the source electrode of the MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with a sixth resistor R14 and a seventh resistor R15, the other end of the sixth resistor R14 is connected with the output end of the pulse receiving and transmitting control module, the other end of the seventh resistor R15 is connected with the drain electrode of the MOS tube Q1, and the drain electrode of the MOS tube Q1 is grounded.
6. The programmable ultrasonic level meter transmitting circuit of claim 5, wherein: the third capacitor C7 is connected in parallel with the first resistor R9, the 9 pin of the transformer T3 is connected with the third capacitor C7 and the first resistor R9, the 6 pin of the transformer T3 is connected with the anode of the third diode D17 and the cathode of the fourth diode D18, and the cathode of the third diode D17 and the anode of the fourth diode D18 are connected with the third capacitor C7 and the first resistor R9.
7. A programmable ultrasonic level meter receiving circuit, comprising: a plurality of resistors, a plurality of capacitors, and an operational amplifier U7;
the plurality of resistors comprise an eighth resistor R16 and a thirteenth resistor R33, and the plurality of capacitors comprise a fourth capacitor C8, a sixth capacitor C14, a seventh capacitor C15, an eighth capacitor C16 and a ninth capacitor C17;
one end of a sixth capacitor C14 is connected with an input signal of the transducer, the other end of the sixth capacitor C14 is connected with a thirteenth resistor R33, one end of a seventh capacitor C15 is connected with the other end of the thirteenth resistor R33, the other end of the seventh capacitor C15 is connected with an inverted input end of an operational amplifier U7, the input voltage of a non-inverting input end of the operational amplifier U7 is VCC/2, an output end of the operational amplifier U7 is connected with an eighth capacitor C16 and a ninth capacitor C17, a 4 pin of the operational amplifier U7 is grounded, an 8 pin of the operational amplifier U7 is grounded at a high level, the other end of the eighth capacitor C16 is connected with a detection circuit, and the other end of the ninth capacitor C17 is grounded;
one end of the eighth resistor R16 is grounded, the other end of the eighth resistor R16 is connected with one end of the fourth capacitor C8, the other end of the eighth resistor R16 is also connected with the other end of the thirteenth resistor R33, and the other end of the fourth capacitor C8 is connected with the output end of the operational amplifier U7.
8. The programmable ultrasonic level meter receiving circuit of claim 7, wherein: the resistors further comprise a ninth resistor R17, a tenth resistor R18, an eleventh resistor R21 and a twelfth resistor R25, one ends of the ninth resistor R17, the tenth resistor R18, the eleventh resistor R21 and the twelfth resistor R25 are connected with the output end of the operational amplifier U7, and the other ends of the ninth resistor R17, the tenth resistor R18, the eleventh resistor R21 and the twelfth resistor R25 are respectively connected with pins 12, 14, 15 and 11 of the analog switch control chip U5.
9. The programmable ultrasonic level meter receiving circuit of claim 8, wherein: a fifth capacitor C13 is connected between the 16 pin and the 6 pin of the analog switch control chip U5, one end of the fifth capacitor C13 is connected with the power supply voltage, the other end of the fifth capacitor C13 is grounded, and the 7 pin and the 8 pin of the analog switch control chip U5 are also grounded.
10. A programmed ultrasonic ranging system, comprising: the signal processing unit is used for receiving the voltage signal converted by the acoustic wave signal and amplifying and detecting the voltage signal, the pulse signal generated by the single chip microcomputer is amplified by the transmitting circuit and then is sent to the transducer to generate the acoustic wave, the transducer converts the electrical signal into the acoustic wave to radiate out and converts the returned acoustic wave into the electrical signal, and the single chip microcomputer sends the processed signal to the communication output module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310616978.XA CN116448216B (en) | 2023-05-29 | 2023-05-29 | Program-controlled ultrasonic liquid level meter transmitting circuit, receiving circuit and ranging system |
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| CN202310616978.XA CN116448216B (en) | 2023-05-29 | 2023-05-29 | Program-controlled ultrasonic liquid level meter transmitting circuit, receiving circuit and ranging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116722863A (en) * | 2023-08-10 | 2023-09-08 | 山东商业职业技术学院 | Synchronous trigger circuit of echo trough of ultrasonic measurement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5131271A (en) * | 1990-04-16 | 1992-07-21 | Magnetrol International, Inc. | Ultrasonic level detector |
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| CN211627459U (en) * | 2020-02-04 | 2020-10-02 | 杭州欧贲科技有限公司 | Pulse width adjustable ultrasonic square wave transmitting circuit |
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| US5131271A (en) * | 1990-04-16 | 1992-07-21 | Magnetrol International, Inc. | Ultrasonic level detector |
| CN207336748U (en) * | 2017-09-13 | 2018-05-08 | 湖南汽车工程职业学院 | A kind of ultrasonic ranging system |
| CN109142520A (en) * | 2018-07-06 | 2019-01-04 | 新兴铸管股份有限公司 | A kind of ultrasonic detection device |
| CN110006505A (en) * | 2019-02-21 | 2019-07-12 | 杭州美仪自动化有限公司 | A kind of ultrasonic level gage and its liquid-level detecting method |
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| CN116722863A (en) * | 2023-08-10 | 2023-09-08 | 山东商业职业技术学院 | Synchronous trigger circuit of echo trough of ultrasonic measurement |
| CN116722863B (en) * | 2023-08-10 | 2023-10-17 | 山东商业职业技术学院 | Synchronous trigger circuit of echo trough of ultrasonic measurement |
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