CN112595777A - Small-size binary channels shock stress wave nondestructive test system - Google Patents
Small-size binary channels shock stress wave nondestructive test system Download PDFInfo
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- CN112595777A CN112595777A CN202011482010.5A CN202011482010A CN112595777A CN 112595777 A CN112595777 A CN 112595777A CN 202011482010 A CN202011482010 A CN 202011482010A CN 112595777 A CN112595777 A CN 112595777A
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- 230000035939 shock Effects 0.000 title claims abstract description 39
- 238000012360 testing method Methods 0.000 title claims description 7
- 230000001133 acceleration Effects 0.000 claims abstract description 70
- 238000009659 non-destructive testing Methods 0.000 claims abstract description 12
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- 230000009286 beneficial effect Effects 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
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Abstract
The invention discloses a small-sized two-channel shock stress wave nondestructive testing system, which comprises an impactor, a first acceleration sensor, a second acceleration sensor, a small-sized two-channel shock stress wave detector and a signal processor, wherein the impactor is connected with the first acceleration sensor; the impactor is arranged on the concrete member to be detected; the first acceleration sensor and the second acceleration sensor are arranged near the impactor or near the defect of the concrete member to be detected, one ends of the first acceleration sensor and the second acceleration sensor are abutted against the surface of the concrete member to be detected, and the other ends of the first acceleration sensor and the second acceleration sensor are electrically connected with the small-sized double-channel shock stress wave detector; the small-sized double-channel impact stress wave detector is electrically connected with the signal processor. The invention can effectively reduce the volume of the shock stress wave detection system, improve the applicability and the detection efficiency of the system and improve the accuracy of the detection result.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing, and particularly relates to a small two-channel impact stress wave nondestructive testing system.
Background
The quality of concrete has an important influence on the stability and the service life of the formed structure in the building, and the construction cost is influenced. The situation of engineering change caused by concrete quality problems generally occurs, and meanwhile, many engineering accident problems are caused by the concrete quality. Therefore, the quality control of the concrete plays a particularly significant role in the quality control of the whole project. The method can detect the internal defects of the concrete in time, and is the most direct and reliable control means for the quality of the concrete engineering. Aiming at the concrete detection problem, a large number of nondestructive detection methods are developed. Typical non-destructive testing methods in the industry are: ultrasonic method, ground penetrating radar method and shock stress wave detection method. However, the ultrasonic method is greatly affected by the reinforcing mesh inside the concrete structure, and the metal corrugated pipe has a shielding effect on the ultrasonic wave, so that the grouting compactness inside the metal pipe cannot be detected. Similarly, the ground penetrating radar method is also affected by the metal material to a greater extent, resulting in poor detection results. The impact stress wave detection technology is a new technology in the field of nondestructive detection, can well solve the problems, and is characterized by simple operation, small energy consumption and wide application range, and is widely applied to the fields of concrete nondestructive detection and pile foundation nondestructive detection.
Although the shock stress wave detection system has entered into engineering application and the detection method has formed some industrial and local standards, there are still some problems in practical engineering application. Such as:
a) because each functional module of the system has different requirements on power supply parameters, a signal conditioner connected with the acceleration sensor usually needs a separate battery for power supply. Especially when the system connects two sensors, the long-term workability of the system is reduced, and thus the applicability of the system is reduced. b) The domestic and foreign industry standards require that the system has the capability of accessing two acceleration sensors, but along with the increase of the number of the accessed sensors, the complexity of power supply and coupling of each functional unit is increased, so that the applicability of the system is also reduced, and the wide application of the technology is limited to a certain level. c) The existing shock stress wave system is usually large in size, and inconvenience is brought to detection application under complex detection conditions.
Therefore, how to provide a small-sized two-channel shock stress wave nondestructive testing system is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the invention provides a small-sized two-channel impact stress wave nondestructive testing system, which can effectively reduce the volume of the impact stress wave testing system, improve the applicability and the testing efficiency of the system, and improve the accuracy of the testing result.
In order to achieve the purpose, the invention adopts the following technical scheme:
a small-size two-channel shock stress wave nondestructive test system includes: the system comprises an impactor, a first acceleration sensor, a second acceleration sensor, a small double-channel impact stress wave detector and a signal processor; the impactor is arranged on the concrete member to be detected; the first acceleration sensor and the second acceleration sensor are arranged near the impactor or near the defects of the concrete member to be detected, one end of each of the first acceleration sensor and the second acceleration sensor is abutted against the surface of the concrete member to be detected, and the other end of each of the first acceleration sensor and the second acceleration sensor is electrically connected with the small two-channel impact stress wave detector; the small-sized double-channel shock stress wave detector is electrically connected with the signal processor.
Preferably, coupling agents are filled in gaps between the first acceleration sensor and the concrete member to be measured and between the second acceleration sensor and the concrete member to be measured.
Preferably, the small-sized dual-channel impact stress wave detector comprises a data acquisition card and a signal conditioner, wherein the signal conditioner is connected with the first acceleration sensor through a first BNC socket and is connected with the second acceleration sensor through a second BNC socket; the signal conditioner is connected with the data acquisition card by adopting double rows of contact pins.
Preferably, the signal conditioner is configured to provide a constant current for the first acceleration sensor and the second acceleration sensor, receive a shock stress wave signal measured by the first acceleration sensor and the second acceleration sensor, and send the shock stress wave signal to the data acquisition card to be converted into a digital signal.
Preferably, the signal conditioner controls the selection of signal gain gears of the two channels through the closing of the double-pole single-throw control circuit and the first single-pole single-throw switch and the second single-pole single-throw switch respectively, the gain is 1 time when the signal conditioner is closed, and the gain is 10 times when the signal conditioner is disconnected; the gain of the signal is selected to be 10 times when the detected signal is weaker and 1 time when the signal is stronger.
Preferably, the data acquisition card is provided with a USB port, the USB port provides a 5V power supply for the data acquisition card and the signal conditioner, and the USB port is connected to the signal processor through a USB connection line and is used for data communication between the data acquisition card and the signal processor.
Preferably, a first row of pins in the double rows of pins is connected with the USB port and the ground, and a second row of pins is output from the two channels of the signal conditioner and connected with the two analog input channels of the data acquisition card for digital conversion.
Preferably, the signal processor is a notebook computer, a tablet computer or an industrial personal computer.
Preferably, the impactor comprises an impact frame, an impact source and an elastic connecting piece, the impact frame is installed on the concrete member to be tested, and the impact source is connected to the impact frame through the elastic connecting piece.
Preferably, the impact source is a group of steel balls, the diameters of the group of steel balls are different, and the value range is 2-10 mm.
The invention has the beneficial effects that:
the signal conditioner adopts a design mode of low power consumption and USB power supply, and shares a USB port with a data acquisition card; the data acquisition card and the signal conditioner adopt a connection mode of double rows of contact pins, so that the signal conditioner does not need to be fixed in the shell independently. The system has the advantages of high applicability, small size, good portability and the like, and can effectively reduce the size of the shock stress wave detection system. The system can be simultaneously connected with two acceleration sensors, can detect more defect types and is suitable for more detection scenes, so that the system applicability and the accuracy of detection results can be further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic diagram of the internal structure of the small two-channel shock stress wave detector according to the present invention.
Fig. 3 is a side view of the internal structure of the small two-channel shock stress wave detector according to the invention.
Wherein, in the figure:
11-an impactor; 12-a source of impact; 20-small two-channel shock stress wave detector; 21-a first BNC jack; 22-a second BNC jack; 23-a housing; 24-a first single pole, single throw switch; 25-a second single pole, single throw switch; 26-double-pole single-throw; 27-a signal conditioner; 28-data acquisition card; 31-a concrete member to be tested; 32-defect; 41-a first acceleration sensor; 42-a second acceleration sensor; 51-a signal processor; 52-USB connection line; 231-USB port; 271-first row of pins; 272-second row of pins.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a small-sized two-channel impact stress wave nondestructive testing system, comprising: the impactor 11, the first acceleration sensor 41 and the second acceleration sensor 42, the small two-channel shock stress wave detector 20 and the signal processor 51; the impactor 11 is installed on the concrete member 31 to be measured; the first acceleration sensor 41 and the second acceleration sensor 42 are arranged near the impactor 11 or near the defect 32 of the concrete member to be detected, one end of each of the first acceleration sensor 41 and the second acceleration sensor 42 is abutted to the surface of the concrete member to be detected 31, and the other end of each of the first acceleration sensor 41 and the second acceleration sensor 42 is electrically connected with the small two-channel shock stress wave detector 20; the compact two-channel shock stress wave detector 20 is electrically connected to the signal processor 51. The compact dual-channel shock stress wave detector 20 is configured to provide constant currents to the first acceleration sensor 41 and the second acceleration sensor 42, receive shock stress wave data measured by the first acceleration sensor 41 and the second acceleration sensor 42, and send the received shock stress wave data to the signal processor 51.
In this embodiment, the coupling agent is filled in the gaps between the first acceleration sensor 41 and the concrete member 31 to be measured and between the second acceleration sensor 42 and the concrete member 31 to be measured. Air in gaps between the first acceleration sensor 41 and the second acceleration sensor 42 and the concrete to be detected can be removed through the couplant, so that the accuracy of the detection result is improved.
In this embodiment, the small two-channel shock stress wave detector 20 includes a data acquisition card 28 and a signal conditioner 27, wherein the signal conditioner 27 is connected to the first acceleration sensor 41 through the first BNC socket 21, and is connected to the second acceleration sensor 42 through the second BNC socket 22; the signal conditioner 27 is connected with the data acquisition card 28 by using double rows of pins.
In this embodiment, the signal conditioner 27 is configured to provide constant currents for the first acceleration sensor 41 and the second acceleration sensor 42, receive the shock stress wave signals measured by the first acceleration sensor 41 and the second acceleration sensor 42, and send the shock stress wave signals to the data acquisition card 28 to be converted into digital signals.
In this embodiment, two channels of the signal conditioner 27 are both designed on the same circuit board, two output ports of the signal conditioner 27 are respectively connected with two analog input channels of the data acquisition card 28, the signal conditioner 27 controls the closing of the circuit through the double-pole single-throw 26, and controls the selection of signal gain gears of the two channels through the first single-pole single-throw switch 24 and the second single-pole single-throw switch 25, wherein the gain is 1 time when the circuit is closed, and the gain is 10 times when the circuit is opened; the gain of the signal is selected to be 10 times when the detected signal is weaker and 1 time when the signal is stronger. The selection of the switch of the signal and the gain gear is respectively adjusted through the main switch and the gain adjusting switch of the signal at the front end of the shock stress wave detector, and the shock stress wave detector has the characteristics of simplicity and flexibility in use. The two channels of the signal conditioner 27 are designed on the same circuit board, and are designed compactly according to the positions of pin connectors of the data acquisition card 28, so that the signal conditioner has the characteristics of small volume and flexible fixing mode. The fixed mode of two pin arrays of the first pin array 271 and the second pin array 272 is adopted to be connected with the data acquisition card 28, the mode of transmitting measurement signals by external connecting wires is omitted, and the anti-interference capacity is high.
In this embodiment, the data acquisition card 28 is provided with a USB port 231, the USB port 231 provides a 5V power supply for the data acquisition card 28 and the signal conditioner 27, and the USB port 231 is connected to the signal processor 51 through a USB connection line 52 for data communication between the data acquisition card 28 and the signal processor 51. The data acquisition card 28 and the signal conditioner 27 share one USB port 231 for power supply; the signal conditioner 27 is in a dual-channel working mode, that is, the signal conditioner can be simultaneously connected with two acceleration sensors to measure stress wave data.
In this embodiment, the first row of pins 271 of the two rows of pins connects the USB port 231 to the ground, and the second row of pins 272 is the output of the two channels of the signal conditioner 27, and is connected to the two analog input channels of the data acquisition card 28 for digital conversion. The data acquisition card 28 is directly secured to the housing 23. The signal conditioner 27 and the data acquisition card 28 are packaged into the shell 23 in a unified manner, and the signal conditioner 27 and the data acquisition card 28 are fixed by two double-row pins, so that the data acquisition card 28 only needs to be fixed during packaging in the shell 23, and the system packaging is simple and convenient.
In this embodiment, the signal processor 51 is a notebook computer, a tablet computer or an industrial personal computer, and is configured to receive and process the impact stress wave data to obtain the relevant parameters of the concrete member 31 to be measured.
The impactor 11 comprises an impact frame, an impact source 12 and an elastic connecting piece, the impact frame is installed on the concrete member 31 to be tested, and the impact source 12 is connected to the impact frame through the elastic connecting piece. Under the action of the elastic connecting piece, the connected impact source 12 impacts the surface of the concrete member 31 to be tested to generate an impact stress wave. The impact source 12 is a group of steel balls, and the diameters of the group of steel balls are different in size and range from 2 mm to 10 mm.
The signal conditioner adopts a design mode of low power consumption and USB power supply, and shares a USB port with the data acquisition card, thereby greatly improving the flexibility and the applicability of the system; two channels of the signal conditioner are both designed on the same circuit board, so that the size of the signal conditioner is far smaller than that of the data acquisition card; the data acquisition card and the signal conditioner adopt a connection mode of double rows of contact pins, so that the signal conditioner does not need to be fixed in the shell independently. The system can be simultaneously connected with two acceleration sensors, can detect more defect types and is suitable for more detection scenes, so that the system applicability and the accuracy of detection results can be further improved. The shock stress wave detection system in the embodiment of the invention is purposefully designed in a miniaturized manner by considering the practical application requirements, the volume of the shock stress wave detection system can be effectively reduced after the shock stress wave detection system is integrally packaged, and the shock stress wave detection system can be directly carried by one hand or placed in a small pocket in practical use, and has the advantages of convenience in carrying, flexibility in use and strong applicability.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a small-size binary channels shock stress wave nondestructive test system which characterized in that includes: the system comprises an impactor, a first acceleration sensor, a second acceleration sensor, a small double-channel impact stress wave detector and a signal processor; the impactor is arranged on the concrete member to be detected; the first acceleration sensor and the second acceleration sensor are arranged near the impactor or near the defects of the concrete member to be detected, one end of each of the first acceleration sensor and the second acceleration sensor is abutted against the surface of the concrete member to be detected, and the other end of each of the first acceleration sensor and the second acceleration sensor is electrically connected with the small two-channel impact stress wave detector; the small-sized double-channel shock stress wave detector is electrically connected with the signal processor.
2. The nondestructive testing system for small-sized dual-channel impact stress waves as claimed in claim 1, wherein the gaps between the first acceleration sensor and the concrete member to be tested and between the second acceleration sensor and the concrete member to be tested are filled with coupling agent.
3. The system according to claim 1, wherein the small two-channel shockwave detector comprises a data acquisition card and a signal conditioner, wherein the signal conditioner is connected to the first acceleration sensor through a first BNC socket and to the second acceleration sensor through a second BNC socket; the signal conditioner is connected with the data acquisition card by adopting double rows of contact pins.
4. The system according to claim 3, wherein the signal conditioner is configured to provide constant currents to the first acceleration sensor and the second acceleration sensor, receive the shock stress wave signals measured by the first acceleration sensor and the second acceleration sensor, and send the shock stress wave signals to the data acquisition card to be converted into digital signals.
5. The nondestructive testing system for the small-sized double-channel shock stress wave as claimed in claim 3 or 4, wherein the signal conditioner controls the selection of signal gain gears of the two channels through the first single-pole single-throw switch and the second single-pole single-throw switch respectively by closing the double-pole single-throw control circuit, the gain is 1 time when the signal conditioner is closed, and the gain is 10 times when the signal conditioner is opened; the gain of the signal is selected to be 10 times when the detected signal is weaker and 1 time when the signal is stronger.
6. The system according to claim 5, wherein the data acquisition card is provided with a USB port, the USB port provides a 5V power supply for the data acquisition card and the signal conditioner, and the USB port is connected with the signal processor through a USB connecting line for data communication between the data acquisition card and the signal processor.
7. The nondestructive testing system for the small-sized dual-channel impact stress wave as recited in claim 6, wherein a first row of pins in the dual-row of pins connects the USB port with the ground, and a second row of pins is the output of the two channels of the signal conditioner and connects with the two analog input channels of the data acquisition card for digital conversion.
8. The nondestructive testing system for the small-sized double-channel shock stress wave as claimed in claim 1, wherein the signal processor is a notebook computer, a tablet computer or an industrial personal computer.
9. The system of claim 1, wherein the impactor comprises an impact frame, an impact source and an elastic connector, the impact frame is mounted on the concrete member to be tested, and the impact source is connected to the impact frame through the elastic connector.
10. The nondestructive testing system for the small-sized dual-channel impact stress wave as claimed in claim 9, wherein the impact source is a group of steel balls, and the diameters of the group of steel balls are different and range from 2 mm to 10 mm.
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