CN112653437B - Delay-free switch circuit, switch and ultrasonic damage diagnosis and detection equipment - Google Patents
Delay-free switch circuit, switch and ultrasonic damage diagnosis and detection equipment Download PDFInfo
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- CN112653437B CN112653437B CN202011449139.6A CN202011449139A CN112653437B CN 112653437 B CN112653437 B CN 112653437B CN 202011449139 A CN202011449139 A CN 202011449139A CN 112653437 B CN112653437 B CN 112653437B
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- 230000006378 damage Effects 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 title abstract description 13
- 238000003745 diagnosis Methods 0.000 title abstract description 8
- 230000005284 excitation Effects 0.000 claims abstract description 30
- 208000027418 Wounds and injury Diseases 0.000 claims description 2
- 208000014674 injury Diseases 0.000 claims description 2
- 235000012431 wafers Nutrition 0.000 abstract description 24
- 230000002269 spontaneous effect Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention relates to the technical field of switching circuits, in particular to a delay-free switching circuit, a switch and ultrasonic damage diagnosis and detection equipment, which comprises a piezoelectric wafer, wherein a circuit is arranged on the piezoelectric wafer; the circuit comprises an excitation end for receiving an excitation signal and a receiving end for collecting a sensor signal; the excitation end is connected with the input end of the first bridge circuit through a first group of back-to-back diodes; the output end of the first bridge circuit is connected with a ground wire, and the other two ends are reversely loaded with voltage; the receiving end is electrically connected with the sensor and is also connected with the output end of the first group of back-to-back diodes through the second group of back-to-back diodes; the output ends of the second group of back-to-back diodes are connected with the input ends of the current limiting unit; the output end of the current limiting unit is connected with a lower-stage circuit. The delay-free switch circuit provided by the invention can realize the spontaneous self-receiving of the signals by the piezoelectric wafers, and can reduce the mutual interference between the signals of the piezoelectric wafers, thereby greatly simplifying the overall structure.
Description
Technical Field
The invention relates to the technical field of switching circuits, in particular to a delay-free switching circuit, a switch and ultrasonic damage diagnosis and detection equipment.
Background
The piezoelectric material is a novel intelligent material, and after the piezoelectric material has a piezoelectric effect from the curie brothers in 1880, the piezoelectric material is rapidly developed along with the continuous improvement of the material science production process, and the application field of the piezoelectric material is wider and wider. The piezoelectric material has piezoelectric effect, namely the mutual conversion function of electric energy and mechanical energy, so that an electric signal is converted into a guided wave signal for detection, and then an echo signal of the guided wave is converted into the electric signal for analysis, and therefore the piezoelectric crystal is also widely applied to the field of sound waves.
The application number is CN201020678856.1 patent name of vacuum insulation board vacuum degree detection device, the publication date is 11/09/2011, a vacuum degree detection device is disclosed, and a signal sending device and a signal receiving and processing device are arranged; the signal transmitting device is provided with a vacuum sensor, a built-in singlechip, a built-in piezoelectric crystal and an electromagnetic relay switch; the signal receiving and processing device is provided with an external piezoelectric crystal, an amplifying circuit, a filter circuit, a follower circuit, an external singlechip and a display. The detection and transmission of the vacuum degree of the built-in part of the vacuum insulation board are realized. The magnetic switch is used for controlling the work of the built-in singlechip by combining the singlechip and the peripheral signal processing circuit, so that the real-time accurate detection and identification of the vacuum degree value of the built-in part of the vacuum insulation board are realized. The built-in singlechip is in a standby state without power consumption, and is simple and safe to operate.
In order to realize the transmission and the reception of signals by the piezoelectric wafers, the above patent adopts one piezoelectric wafer as excitation and the other piezoelectric wafer as reception, so that the whole structure is complex, the system is built redundantly, a large number of cables can be generated, and the detection and the line investigation are both unfavorable. And also employs a relay as a switch, which is an inherent noise device whose switch closure and contact bounce can produce spurious pulses of high amplitude, which can damage very sensitive receiving electronics and produce unreliable data.
Disclosure of Invention
In order to solve the technical problems that the piezoelectric wafer cannot be self-received and has a complex structure, the invention provides a delay-free switch circuit, which comprises a piezoelectric wafer, wherein a circuit is arranged on the piezoelectric wafer; the circuit comprises an excitation end for receiving an excitation signal and a receiving end for collecting a sensor signal; the excitation end is connected with an input end joint of the first bridge circuit through a first group of back-to-back diodes; the other output end contact point which is symmetrical with the input end of the first bridge circuit is grounded, and the other two symmetrical end contact points are reversely loaded with voltage; the receiving end is electrically connected with the sensor and is also connected with the output end of the first group of back-to-back diodes through the second group of back-to-back diodes; the output ends of the second group of back-to-back diodes are connected with the input ends of the current limiting unit; the output end of the current limiting unit is connected with a lower-stage circuit.
On the basis of the technical scheme, further, the first bridge circuit is reversely loaded with +/-15V voltage.
On the basis of the technical scheme, further, the output end of the current limiting unit is also connected with a third group of back-to-back diodes, and the output end of the third group of back-to-back diodes is connected with a ground wire.
Based on the above technical solution, further, the model numbers of the first group of back-to-back diodes, the second group of back-to-back diodes and the third group of back-to-back diodes are IN40004.
On the basis of the technical scheme, the current limiting unit is a second bridge circuit consisting of four diodes.
Based on the technical scheme, further, the other two symmetrical ends of the first bridge circuit and/or the second bridge circuit are respectively connected with a resistor in series.
On the basis of the technical scheme, further, the other two symmetrical ends of the second bridge circuit are reversely loaded with voltage.
The invention also provides a non-delay switch, which adopts the non-delay switch circuit.
The invention also provides ultrasonic damage diagnosis equipment which adopts the delay-free switch.
The invention also provides ultrasonic detection equipment which adopts the delay-free switch circuit.
Compared with the prior art, the delay-free switching circuit provided by the invention has the following advantages: the excitation end and the receiving end are arranged on the same piezoelectric wafer, so that the spontaneous self-receiving of signals by the piezoelectric wafer can be realized, a plurality of unnecessary circuit structures and the number of sensors are reduced, and the overall structure is simplified. The circuit can reduce the mutual interference between the signals of the piezoelectric wafers while realizing the spontaneous self-receiving signals of the piezoelectric wafers, and greatly optimize the performance of the delay-free switch.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a circuit diagram of a delay-free switching circuit provided by the invention;
FIG. 2 shows the signal-to-noise ratio variation of the acquired signals before and after the external circuit without delay switch;
FIG. 3 is a schematic diagram of a prior art ultrasonic injury diagnostic device without a delay switch;
fig. 4 is a layout diagram of an ultrasonic damage diagnosis apparatus without a delay switch provided by the present invention.
Reference numerals:
10 first group of back-to-back diodes 20 first bridge 30 second group of back-to-back diodes
40 current limiting unit 50 third group of back-to-back diodes
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a delay-free switch circuit, which comprises a piezoelectric wafer, wherein a circuit is arranged on the piezoelectric wafer; the circuit comprises an excitation end for receiving an excitation signal and a receiving end for collecting a sensor signal; the excitation terminal is connected with an input terminal of the first bridge 20 through a first group of back-to-back diodes 10; the other output terminal contact point which is symmetrical with the input terminal of the first bridge circuit 20 is grounded, and the other two symmetrical terminal contact points are reversely loaded with voltage; the receiving end is not only electrically connected with the sensor, but also connected with the output end of the first group of back-to-back diodes 10 through the second group of back-to-back diodes 30; the output ends of the second group of back-to-back diodes 30 are connected with the input ends of the current limiting unit 40; the output end of the current limiting unit 40 is connected with a lower-stage circuit.
In the implementation, as shown in fig. 1, a circuit is arranged on the piezoelectric wafer; the circuit comprises an excitation end for receiving an excitation signal and a receiving end for collecting a sensor signal; the excitation end and the receiving end are in signal connection with a host system at the upper level, and the host system is controlled by the upper computer so as to control the excitation end and the receiving end to transmit signals. The excitation terminal is connected with an input terminal of the first bridge 20 through a first group of back-to-back diodes 10; the back-to-back diodes are two diodes connected in reverse parallel, which plays a role in limiting the signal, and the first group of back-to-back diodes 10 can be used for isolating low-level noise generated by the excitation signal by using high impedance. The other symmetrical output end of the first bridge 20 is connected to the ground, and the other two ends are reversely biased with voltage, so that the bridge can be reversely biased to block current by the reversely biased voltage, wherein the first bridge 20 is formed by connecting four diodes in parallel in two directions, and then connecting the four diodes in parallel in opposite directions, as shown in fig. 1. The receiving end is not only electrically connected with the sensor, but also connected with the output end of the first group of back-to-back diodes 10 through the second group of back-to-back diodes 30; the output ends of the second group of back-to-back diodes 30 are connected with the input ends of the current limiting unit 40; the output end of the current limiting unit 40 is connected with a lower-stage circuit; wherein the current limiting unit 40 acts to limit the sensor side current so that only a small portion of the current is passed to the next stage circuit.
The specific principle of operation is that the excitation signal passes through the first set of back-to-back diodes 10 from the excitation terminal and then flows to the first bridge 20, which, due to its forward bias, will deliver the low voltage noise signal from the excitation terminal to ground. Thus, devices that generate excitation signals, such as power amplifiers, etc., can be isolated during signal reception by the circuit so that no mutual interference occurs between the signals. When the excitation terminal generates a signal greater than a certain value, the first bridge 20 is reverse biased and the signal will be transferred to the sensor terminal via the second set of back-to-back diodes 30, and only a small portion of the current will be transferred to the next stage circuit, since the sensor terminal is connected to the current limiting unit 40. When the signal generated by the excitation terminal is smaller than a certain value, the first set of back-to-back diodes 10 and the second set of back-to-back diodes 30 are all open, so that the signal received back from the sensor terminal can collect the signal through the receiving terminal, and the voltage signal can also be transmitted to the next stage circuit through the current limiting unit 40.
According to the delay-free switch circuit provided by the invention, the excitation end and the receiving end are arranged on the same piezoelectric wafer, so that the spontaneous self-receiving of signals by the piezoelectric wafer can be realized, a plurality of unnecessary circuit structures and the number of sensors are reduced, and the overall structure is simplified. The circuit can reduce the mutual interference between the signals of the piezoelectric wafers while realizing the spontaneous self-receiving signals of the piezoelectric wafers, and greatly optimize the performance of the delay switch. Meanwhile, the circuit is also suitable for being connected with any sensor with the same structure of an excitation end and a receiving end.
Preferably, the first bridge 20 is reverse-loaded with a +15v voltage.
Preferably, the output end of the current limiting unit 40 is further connected to a third set of back-to-back diodes 50, and the output end of the third set of back-to-back diodes 50 is connected to ground.
In specific implementation, the output end of the current limiting unit 40 is further connected to a third set of back-to-back diodes 50, and the output end of the third set of back-to-back diodes 50 is connected to a ground line. The third set of back-to-back diodes 50 is used to limit the drain on signal of the lower circuit to a level small enough to make the circuit not affected by the signal of the lower circuit, and the two circuits can work independently without interference.
Preferably, the first, second and third sets of back-to-back diodes 10, 30, 50 are IN40004.
IN particular, the first set of back-to-back diodes 10, the second set of back-to-back diodes 30, and the third set of back-to-back diodes 50 may be rectifier diodes, but are not limited thereto, and may be IN40004.
Preferably, the current limiting unit 40 is a second bridge circuit composed of four diodes.
In particular, the current limiting unit 40 is a second bridge circuit composed of four diodes. The four diodes are connected in parallel in opposite directions after being connected in parallel in pairs. When the diode is forward biased, the current is on. When the diode is reverse biased, only a small portion of the current passes to the next stage.
Preferably, the remaining symmetrical ends of the first bridge 20 and/or the second bridge are each connected in series with a resistor.
In specific implementation, the other two symmetrical ends of the first bridge 20 and/or the second bridge are respectively connected in series with a resistor, and the resistance of the resistor can be selected according to requirements, for example, a very low resistance can be selected so that most of the signals returned from the sensor end can be transmitted to the next stage circuit, and a very large resistance can be selected so that the signals of the sensor are rarely transmitted to the next stage circuit.
Preferably, the other two symmetrical ends of the second bridge are reversely applied with voltage.
In specific implementation, the other two symmetrical ends of the second bridge circuit are reversely loaded with voltage, so that the bridge circuit can reversely bias to play a role of blocking current when receiving signals with a value larger than a certain value.
The invention also provides a non-delay switch, which adopts the non-delay switch circuit.
In the implementation, as shown in fig. 2, the switch using the delay-free switch circuit is connected between the experimental body and the signal generation, and the feasibility of the switch is verified by an experiment using a length-telescopic piezoelectric wafer, as shown in fig. 2, the change of the signal-to-noise ratio of the collected signals before and after the external circuit is shown. Wherein the left graph of fig. 2 shows the signal-to-noise ratio variation before the no-delay switch is arranged, and the right graph shows the signal-to-noise ratio variation after the no-delay switch is arranged. The graph shows that the signal-to-noise ratio distribution has larger change, and the high signal-to-noise ratio area is concentrated at a high gain position and is similar to a direct acquisition result. In addition, the signal to noise ratio is stable in the sampling interval range (namely 50-120kHz and 35-45 dB), and can basically reach about 50 dB. The result proves that the circuit has smaller influence on signal acquisition, which proves that the circuit greatly simplifies the layout of the sensing array under the condition of smaller change on the original signal, and is helpful for improving and optimizing sensing. On the other hand, the switch can be also suitable for other acoustic devices adopting a transducer structure, thereby meeting the requirements of high reliability and low failure rate.
The invention also provides ultrasonic damage diagnosis equipment which adopts the delay-free switch.
In the implementation, as shown in fig. 3-4, fig. 3 is a device without the delay switch, and one piezoelectric chip is used as excitation, and the other piezoelectric chip is used as receiving, so that the whole structure is complex. And the number of sensors needs to be arranged more. And fig. 4 shows an ultrasonic damage diagnosis apparatus using the above-mentioned delay-free switch, and it can be seen from the figure that the number of sensors can be effectively optimized to half of the original number by spontaneous self-reception of a single piezoelectric wafer using the above-mentioned delay-free switch.
The invention also provides ultrasonic detection equipment, which adopts the delay-free switch circuit.
In specific implementation, by adopting the ultrasonic detection equipment without the delay switch circuit, the system can be automatically switched from the excitation mode to the receiving mode without using a relay, and the mutual interference among piezoelectric wafer signals can be reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A no delay switch circuit, includes piezoelectric chip, its characterized in that: a circuit is arranged on the piezoelectric wafer; the circuit comprises an excitation end for receiving an excitation signal and a receiving end for collecting a sensor signal; the excitation end is connected with an input end joint of the first bridge circuit (20) through a first group of back-to-back diodes (10); the other output end contact point which is symmetrical with the input end of the first bridge circuit (20) is grounded, and the other two symmetrical end contact points are reversely loaded with voltage;
the receiving end is electrically connected with the sensor and is also connected with the output end of the first group of back-to-back diodes (10) through the second group of back-to-back diodes (30); the output ends of the second group of back-to-back diodes (30) are connected with the input ends of the current limiting units (40); the output end of the current limiting unit (40) is connected with a lower-stage circuit.
2. A delay-free switching circuit as recited in claim 1, further comprising: the first bridge (20) is reverse-loaded with a + -15V voltage.
3. A delay-free switching circuit as recited in claim 1, further comprising: the output end of the current limiting unit (40) is also connected with a third group of back-to-back diodes (50), and the output end of the third group of back-to-back diodes (50) is connected with a ground wire.
4. A delay-free switching circuit as recited in claim 3, further comprising: the first group of back-to-back diodes (10), the second group of back-to-back diodes (30) and the third group of back-to-back diodes (50) are of the type IN40004.
5. A delay-free switching circuit as recited in claim 1, further comprising: the current limiting unit (40) is a second bridge circuit composed of four diodes.
6. The delay-free switching circuit of claim 5, wherein: the other two symmetrical ends of the first bridge circuit (20) and/or the second bridge circuit are respectively connected with a resistor in series.
7. The delay-free switching circuit of claim 5, wherein: and the other two symmetrical ends of the second bridge circuit are reversely loaded with voltage.
8. A time delay free switch, characterized by: use of a delay-free switching circuit as claimed in any one of claims 1-7.
9. An ultrasonic injury diagnostic device, characterized by: use of a time delay free switch as defined in claim 8.
10. An ultrasonic testing apparatus, characterized in that: use of a delay-free switching circuit as claimed in any one of claims 1-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011449139.6A CN112653437B (en) | 2020-12-09 | 2020-12-09 | Delay-free switch circuit, switch and ultrasonic damage diagnosis and detection equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011449139.6A CN112653437B (en) | 2020-12-09 | 2020-12-09 | Delay-free switch circuit, switch and ultrasonic damage diagnosis and detection equipment |
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| CN112653437A CN112653437A (en) | 2021-04-13 |
| CN112653437B true CN112653437B (en) | 2024-02-13 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594329A (en) * | 2001-07-03 | 2012-07-18 | 布拉德伯里·R·法塞 | Self-powered switch initiation system |
| WO2017020189A1 (en) * | 2015-07-31 | 2017-02-09 | 常州明石晶电科技有限公司 | Switching mode power supply |
| CN111562306A (en) * | 2020-05-01 | 2020-08-21 | 湖北三江航天万峰科技发展有限公司 | Magnetostrictive guided wave detection system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298569B (en) * | 2010-12-09 | 2016-10-19 | 意法半导体股份有限公司 | For applications of ultrasound transmission channel on-off circuit, for driving transmission channel and the method for on-off circuit |
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- 2020-12-09 CN CN202011449139.6A patent/CN112653437B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594329A (en) * | 2001-07-03 | 2012-07-18 | 布拉德伯里·R·法塞 | Self-powered switch initiation system |
| WO2017020189A1 (en) * | 2015-07-31 | 2017-02-09 | 常州明石晶电科技有限公司 | Switching mode power supply |
| CN111562306A (en) * | 2020-05-01 | 2020-08-21 | 湖北三江航天万峰科技发展有限公司 | Magnetostrictive guided wave detection system |
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