CN213423073U - Air coupling ultrasonic signal receiving circuit - Google Patents
Air coupling ultrasonic signal receiving circuit Download PDFInfo
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- CN213423073U CN213423073U CN202021110210.3U CN202021110210U CN213423073U CN 213423073 U CN213423073 U CN 213423073U CN 202021110210 U CN202021110210 U CN 202021110210U CN 213423073 U CN213423073 U CN 213423073U
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Abstract
The utility model provides an air coupling ultrasonic signal receiving circuit, including leading processing circuit module, leading difference amplifier circuit module, controllable gain amplifier circuit module, half-wave rectifier circuit module and envelope detection circuit module, produce the wave form that can drive outside singlechip work through electric capacity, operational amplifier, diode, this circuit signal wave form stability is good, simple structure, the low cost of circuit can be satisfying wood defect detection requirement, high performance, low-power consumption.
Description
Technical Field
The utility model relates to an among the air coupling ultrasonic wave wood defect detection area, ultrasonic transducer receives ultrasonic wave transmission signal and filters, enlargies, the rectification, gives singlechip analysis and processing.
Background
Because the transmission signal received by the air coupling ultrasonic probe is very weak, generally only ten millivolts or even millivolts, and usually has a small direct current signal, in the actual application process of the air coupling ultrasonic nondestructive testing, the sizes of the ultrasonic transmission signals are greatly different due to different thicknesses and different materials of the tested materials. The transmitted signal has oscillation attenuation phenomenon. Therefore, the transmission signal received by the ultrasonic probe must be filtered, amplified, rectified and enveloped. The performance of the signal receiving circuit has great influence on the stability and the precision of the air coupling ultrasonic wood defect detection.
Disclosure of Invention
The invention aims to provide a signal receiving circuit capable of realizing wood air coupling ultrasonic defect detection, which has the advantages of simple structure, strong reliability, low cost and the like.
The invention aims to provide a receiving circuit capable of realizing air coupling ultrasonic detection signals, which comprises a preprocessing circuit, a pre-differential amplifying circuit, a controllable gain amplifying circuit, a half-wave rectifying circuit and an envelope detecting circuit.
The utility model discloses a realize above-mentioned purpose, the technical scheme who takes is: a signal receiving circuit suitable for air coupling ultrasonic waves comprises a preprocessing circuit, a pre-differential amplifying circuit, a controllable gain amplifying circuit, a half-wave rectifying circuit and an envelope detecting circuit; wherein: the pre-processing circuit module is used for eliminating direct current offset and amplitude limiting, the input end of the pre-processing circuit module is connected with the external signal receiving transducer, and the output end of the pre-processing circuit module is connected with the resistor; the preposed differential amplifying circuit module is used for generating an amplifying signal, the input end of the preposed differential amplifying circuit module is connected with the resistor and the backward diode, and the output end of the preposed differential amplifying circuit module is connected with the capacitor; the controllable gain amplification circuit module is used for improving the detection range of the detection device and the adaptability of the device, the input end of the controllable gain amplification circuit module is connected with the instrument amplifier AD620, and the output end of the controllable gain amplification circuit module is connected with the capacitor; the half-wave rectifier circuit module is used for carrying out precise rectification processing on the amplified transmission signal, the input end of the half-wave rectifier circuit module is connected with the first integrated operational amplifier chip OP37 and the variable resistor, and the output end of the half-wave rectifier circuit module is connected with the resistor; the envelope detection circuit module is used for obtaining envelope detection signals of the envelope detection circuit module and improving the acquisition precision of the ADC, the input end of the envelope detection circuit module is connected with the diode, and the output end of the envelope detection circuit module is connected with the external single chip microcomputer; the front processing circuit module comprises a resistor R1, a capacitor C1, a capacitor C2, a backward diode D1, a backward diode D2, a resistor R2 and a resistor R3; the preposed differential amplifying circuit comprises a resistor R4, a resistor R5, an amplifier AD620 and a resistor R6; the controllable gain amplifying circuit comprises a capacitor C3, a resistor R7, a resistor R8, a resistor R9, a second integrated operational amplifier chip OP37, a resistor R10, a resistor R11, a resistor R12 and a third integrated operational amplifier chip OP 37; the half-wave rectifying circuit comprises a capacitor C4, a resistor R13, a first operational amplifier TL081, a resistor R14, a resistor R15, a diode D3 and a diode D4; the envelope detection circuit comprises a resistor R16, a resistor R17, a capacitor C5, a capacitor C6, a second operational amplifier TL081, a resistor R18 and a resistor R19; the transmission signal received by the external signal receiving transducer is connected with a resistor R1, a capacitor C1 and a capacitor C2, the other end of the capacitor C1 is connected with one end of a backward diode D1, a backward diode D2, a resistor R2 and a resistor R4, the other end of the resistor R2 is grounded, the other end of the capacitor C2 is connected with one end of a backward diode D1, a backward diode D2, a resistor R3 and a resistor R5, the other end of the resistor R3 is grounded, the other end of the resistor R4 is connected with a pin 2 of an amplifier AD620, the other end of a resistor R5 is connected with a pin 3 of the amplifier AD620, a pin 1 of the amplifier AD620 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with a pin 8 of the amplifier AD620, a pin 5 of the amplifier AD620 is grounded, a pin 7 of the amplifier AD620 is connected with a 12v power supply, a pin 4 of the amplifier AD620 is connected with a-12 v power supply, the other end of the capacitor C3 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with one end of a pin 2 and a pin R8 of a second integrated operational amplifier chip OP37, the pin 3 of a second integrated operational amplifier chip OP37 is connected with one end of a resistor R9, the other end of the resistor R9 is grounded, the pin 7 of the second integrated operational amplifier chip OP37 is connected with a 12v power supply, the pin 4 of the second integrated operational amplifier chip OP37 is connected with a-12 v power supply, the other end of the resistor R8 is connected with one end of a pin 6 and a resistor R10 of a second integrated operational amplifier chip OP 92, the other end of the resistor R10 is connected with one end of a pin 2 and a resistor R11 of a third integrated operational amplifier chip OP37, the pin 3 of the third integrated operational amplifier chip OP37 is connected with one end of a resistor R12, the other end of the resistor R12 is grounded, the pin 7 of a third integrated operational amplifier chip OP37 is connected with a 12v power supply, and the pin 4-12 v power supply of the third integrated operational amplifier chip, the other end of the resistor R11 is connected to one end of a pin 6 of the third integrated operational amplifier chip OP37 and one end of a capacitor C4, the other end of the capacitor C3 is connected to one end of a resistor R13, the other end of the resistor R13 is connected to one end of a pin 2 of the first operational amplifier TL081, a resistor R14 and one end of a diode D3, a pin 3 of the first operational amplifier TL081 is connected to one end of a resistor R15, the other end of the resistor R15 is grounded, a pin 7 of the first operational amplifier TL081 is connected to a 12v power supply, a pin 4 of the first operational amplifier TL081 is connected to-12 v power supply, the other end of the diode D3 is connected to one end of a pin 6 of the first operational amplifier TL081 and a diode D4, the other end of the resistor R14 is connected to the other end of a diode D4 and one end of a resistor R16, the other end of the resistor R16 is connected to one end of a resistor R17 and one end of a capacitor C, The pin 3 of the second operational amplifier TL081 is connected, the other end of the capacitor C6 is grounded, the pin 2 of the second operational amplifier TL081 is connected with one ends of the resistor R18 and the resistor R19, the other end of the resistor R18 is grounded, the pin 7 of the second operational amplifier TL081 is connected with a 12v power supply, the pin 4 of the second operational amplifier TL081 is connected with a-12 v power supply, and the other end of the resistor R19 is connected with the pin 6 of the second operational amplifier TL081, the other end of the capacitor C5 and an external single chip microcomputer.
The beneficial effects of the utility model are that, the circuit is under the excitation of the transmission signal of ultrasonic wave after the medium conversion, strains direct electric capacity through two, avoids influencing the direct current small signal in the transmission signal to the follow-up amplifier circuit of ultrasonic wave. The detection range of the detection device and the adaptability of the device are improved by connecting two reverse diodes in parallel to ground for amplitude limiting, amplifying signals by an instrumentation amplifier AD620, integrating an operational amplifier OP37 into an operational amplifier chip, and carrying out envelope detection on transmission signals by an operational amplifier TL 081. The circuit has simple structure and low cost, can greatly reduce the signal transmitting power on the premise of meeting the requirement of the work of the ultrasonic probe, and has high performance and low power consumption.
Drawings
Fig. 1 is a block diagram of an air-coupled ultrasonic signal receiving circuit according to the present invention.
Fig. 2 is a schematic diagram of an air-coupled ultrasonic signal receiving circuit provided by the present invention.
Detailed Description
The transmission signal received by the external signal receiving transducer is connected with a resistor R1, a capacitor C1 and a capacitor C2, the other end of the capacitor C1 is connected with one end of a backward diode D1, a backward diode D2, a resistor R2 and a resistor R4, the other end of the resistor R2 is grounded, the other end of the capacitor C2 is connected with one end of a backward diode D1, a backward diode D2, a resistor R3 and a resistor R5, the other end of the resistor R3 is grounded, the other end of the resistor R4 is connected with a pin 2 of an amplifier AD620, the other end of a resistor R5 is connected with a pin 3 of the amplifier AD620, a pin 1 of the amplifier AD620 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with a pin 8 of the amplifier AD620, a pin 5 of the amplifier AD620 is grounded, a pin 7 of the amplifier AD620 is connected with a 12v power supply, a pin 4 of the amplifier AD620 is connected with a-12 v power supply, the other end of the capacitor C3 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with one end of a pin 2 and a pin R8 of a second integrated operational amplifier chip OP37, the pin 3 of a second integrated operational amplifier chip OP37 is connected with one end of a resistor R9, the other end of the resistor R9 is grounded, the pin 7 of the second integrated operational amplifier chip OP37 is connected with a 12v power supply, the pin 4 of the second integrated operational amplifier chip OP37 is connected with a-12 v power supply, the other end of the resistor R8 is connected with one end of a pin 6 and a resistor R10 of a second integrated operational amplifier chip OP 92, the other end of the resistor R10 is connected with one end of a pin 2 and a resistor R11 of a third integrated operational amplifier chip OP37, the pin 3 of the third integrated operational amplifier chip OP37 is connected with one end of a resistor R12, the other end of the resistor R12 is grounded, the pin 7 of a third integrated operational amplifier chip OP37 is connected with a 12v power supply, and the pin 4-12 v power supply of the third integrated operational amplifier chip, the other end of the resistor R11 is connected to the pin 6 of the third integrated operational amplifier chip OP37 and one end of the capacitor C4, the other end of the capacitor C3 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to one end of the pin 2 of the first operational amplifier TL081, the resistor R14 and one end of the diode D3, the pin 3 of the first operational amplifier TL081 is connected to one end of the resistor R15, the other end of the resistor R15 is grounded, the pin 7 of the first operational amplifier TL081 is connected to the 12v power supply, the pin 4 of the first operational amplifier TL081 is connected to the-12 v power supply, the other end of the diode D3 is connected to the pin 6 of the first operational amplifier TL081 and one end of the diode D4, the other end of the resistor R14 is connected to the other end of the diode D4 and one end of the resistor R16, the other end of the resistor R16 is connected to one end of the resistor R356 and one end of the capacitor C5, the other end of the resistor R17 is connected, the other end of the capacitor C6 is grounded, a pin 2 of a second operational amplifier TL081 is connected with one ends of a resistor R18 and a resistor R19, the other end of the resistor R18 is grounded, a pin 7 of the second operational amplifier TL081 is connected with a 12v power supply, a pin 4 of the second operational amplifier TL081 is connected with a-12 v power supply, and the other end of a resistor R19 is connected with a pin 6 of the second operational amplifier TL081, the other end of the capacitor C5 and an external single chip microcomputer.
The diode D1 is of type MUR180, the diode D2 is of type MUR180, the diode D3 is of type 1N4148, the diode D4 is of type 1N4148, the resistor R1 is of type 1K Ω, the resistor R2 is of type 10K Ω, the resistor R3 is of type 10K Ω, the resistor R4 is of type 1K Ω, the resistor R5 is of type 1K Ω, the resistor R6 is of type 10K Ω, the resistor R7 is of type 1K Ω, the resistor R8 is of type 100K Ω, the resistor R9 is of type 1K Ω, the resistor R10 is of type 1K Ω, the resistor R11 is of type 20K Ω, the resistor R12 is of type 1K Ω, the resistor R13 is of type 10K Ω, the resistor R14 is of type 10K Ω, the resistor R15 is of type 10K Ω, the resistor R16 is of type 23K Ω, the resistor R2K 2K Ω, the resistor R695 is of type 1K Ω, the resistor R19 is of type 1K, the resistor R8653 is of type 8253 is of type 10K Ω, the capacitance of the capacitor C2 is 10nF, the capacitance of the capacitor C3 is 10nF, the capacitance of the capacitor C4 is 10nF, the capacitance of the capacitor C5 is 1nF, and the capacitance of the capacitor C6 is 1 nF.
In conclusion, the air coupling ultrasonic signal receiving circuit is realized by adopting a circuit with a simple structure. Those skilled in the art can make numerous possible variations and modifications to the present invention using the methods and techniques described above, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (1)
1. An air coupling ultrasonic signal receiving circuit is characterized in that the ultrasonic signal receiving circuit comprises a preprocessing circuit module, a pre-differential amplification circuit module, a controllable gain amplification circuit module, a half-wave rectification circuit module and an envelope detection circuit module; wherein: the pre-processing circuit module is used for eliminating direct current offset and amplitude limiting, the input end of the pre-processing circuit module is connected with the external signal receiving transducer, and the output end of the pre-processing circuit module is connected with the resistor; the preposed differential amplifying circuit module is used for generating an amplifying signal, the input end of the preposed differential amplifying circuit module is connected with the resistor and the backward diode, and the output end of the preposed differential amplifying circuit module is connected with the capacitor; the controllable gain amplification circuit module is used for improving the detection range of the detection device and the adaptability of the device, the input end of the controllable gain amplification circuit module is connected with the instrument amplifier AD620, and the output end of the controllable gain amplification circuit module is connected with the capacitor; the half-wave rectifier circuit module is used for carrying out precise rectification processing on the amplified transmission signal, the input end of the half-wave rectifier circuit module is connected with the first integrated operational amplifier chip OP37 and the variable resistor, and the output end of the half-wave rectifier circuit module is connected with the resistor; the envelope detection circuit module is used for obtaining envelope detection signals of the envelope detection circuit module and improving the acquisition precision of the ADC, the input end of the envelope detection circuit module is connected with the diode, and the output end of the envelope detection circuit module is connected with the external single chip microcomputer; the front processing circuit module comprises a resistor R1, a capacitor C1, a capacitor C2, a backward diode D1, a backward diode D2, a resistor R2 and a resistor R3; the preposed differential amplifying circuit comprises a resistor R4, a resistor R5, an amplifier AD620 and a resistor R6; the controllable gain amplifying circuit comprises a capacitor C3, a resistor R7, a resistor R8, a resistor R9, a second integrated operational amplifier chip OP37, a resistor R10, a resistor R11, a resistor R12 and a third integrated operational amplifier chip OP 37; the half-wave rectifying circuit comprises a capacitor C4, a resistor R13, a first operational amplifier TL081, a resistor R14, a resistor R15, a diode D3 and a diode D4; the envelope detection circuit comprises a resistor R16, a resistor R17, a capacitor C5, a capacitor C6, a second operational amplifier TL081, a resistor R18 and a resistor R19; the transmission signal received by the external signal receiving transducer is connected with a resistor R1, a capacitor C1 and a capacitor C2, the other end of the capacitor C1 is connected with one end of a backward diode D1, a backward diode D2, a resistor R2 and a resistor R4, the other end of the resistor R2 is grounded, the other end of the capacitor C2 is connected with one end of a backward diode D1, a backward diode D2, a resistor R3 and a resistor R5, the other end of the resistor R3 is grounded, the other end of the resistor R4 is connected with a pin 2 of an amplifier AD620, the other end of a resistor R5 is connected with a pin 3 of the amplifier AD620, a pin 1 of the amplifier AD620 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with a pin 8 of the amplifier AD620, a pin 5 of the amplifier AD620 is grounded, a pin 7 of the amplifier AD620 is connected with a 12v power supply, a pin 4 of the amplifier AD620 is connected with a-12 v power supply, the other end of the capacitor C3 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with one end of a pin 2 and a pin R8 of a second integrated operational amplifier chip OP37, the pin 3 of a second integrated operational amplifier chip OP37 is connected with one end of a resistor R9, the other end of the resistor R9 is grounded, the pin 7 of the second integrated operational amplifier chip OP37 is connected with a 12v power supply, the pin 4 of the second integrated operational amplifier chip OP37 is connected with a-12 v power supply, the other end of the resistor R8 is connected with one end of a pin 6 and a resistor R10 of a second integrated operational amplifier chip OP 92, the other end of the resistor R10 is connected with one end of a pin 2 and a resistor R11 of a third integrated operational amplifier chip OP37, the pin 3 of the third integrated operational amplifier chip OP37 is connected with one end of a resistor R12, the other end of the resistor R12 is grounded, the pin 7 of a third integrated operational amplifier chip OP37 is connected with a 12v power supply, and the pin 4-12 v power supply of the third integrated operational amplifier chip, the other end of the resistor R11 is connected to the pin 6 of the third integrated operational amplifier chip OP37 and one end of the capacitor C4, the other end of the capacitor C3 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to one end of the pin 2 of the first operational amplifier TL081, the resistor R14 and one end of the diode D3, the pin 3 of the first operational amplifier TL081 is connected to one end of the resistor R15, the other end of the resistor R15 is grounded, the pin 7 of the first operational amplifier TL081 is connected to the 12v power supply, the pin 4 of the first operational amplifier TL081 is connected to the-12 v power supply, the other end of the diode D3 is connected to the pin 6 of the first operational amplifier TL081 and one end of the diode D4, the other end of the resistor R14 is connected to the other end of the diode D4 and one end of the resistor R16, the other end of the resistor R16 is connected to one end of the resistor R356 and one end of the capacitor C5, the other end of the resistor R17 is connected, the other end of the capacitor C6 is grounded, a pin 2 of a second operational amplifier TL081 is connected with one ends of a resistor R18 and a resistor R19, the other end of the resistor R18 is grounded, a pin 7 of the second operational amplifier TL081 is connected with a 12v power supply, a pin 4 of the second operational amplifier TL081 is connected with a-12 v power supply, and the other end of a resistor R19 is connected with a pin 6 of the second operational amplifier TL081, the other end of the capacitor C5 and an external single chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021110210.3U CN213423073U (en) | 2020-06-16 | 2020-06-16 | Air coupling ultrasonic signal receiving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021110210.3U CN213423073U (en) | 2020-06-16 | 2020-06-16 | Air coupling ultrasonic signal receiving circuit |
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| CN213423073U true CN213423073U (en) | 2021-06-11 |
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| CN202021110210.3U Expired - Fee Related CN213423073U (en) | 2020-06-16 | 2020-06-16 | Air coupling ultrasonic signal receiving circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777595A (en) * | 2021-09-14 | 2021-12-10 | 天津理工大学 | Ultrasonic receiving circuit |
| CN115733492A (en) * | 2021-08-30 | 2023-03-03 | 常州同惠电子股份有限公司 | Sampling unit bias protection circuit and protection method for digital power meter |
-
2020
- 2020-06-16 CN CN202021110210.3U patent/CN213423073U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115733492A (en) * | 2021-08-30 | 2023-03-03 | 常州同惠电子股份有限公司 | Sampling unit bias protection circuit and protection method for digital power meter |
| CN113777595A (en) * | 2021-09-14 | 2021-12-10 | 天津理工大学 | Ultrasonic receiving circuit |
| CN113777595B (en) * | 2021-09-14 | 2023-08-11 | 天津理工大学 | Ultrasonic wave receiving circuit |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211119 Address after: Room 107, Business Park of Metasequoia University, 159 Longpan Road, Xuanwu District, Nanjing City, Jiangsu Province Patentee after: Nanjing Intrinsic Instruments Co.,Ltd. Address before: Longpan road Xuanwu District of Nanjing city of Jiangsu Province, No. 159 210037 Patentee before: NANJING FORESTRY University |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210611 |