CN110988118A - Wood material defect detection system - Google Patents
Wood material defect detection system Download PDFInfo
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- CN110988118A CN110988118A CN201911002454.1A CN201911002454A CN110988118A CN 110988118 A CN110988118 A CN 110988118A CN 201911002454 A CN201911002454 A CN 201911002454A CN 110988118 A CN110988118 A CN 110988118A
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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
- G01N29/04—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
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1706—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0238—Wood
Abstract
The application discloses wooden material defect detecting system, this system includes: the detection device comprises a detection table, a pulse excitation unit, a signal receiver and signal processing equipment, wherein the detection table is used for placing a wood material to be detected; the pulse excitation unit is arranged on one side of the detection table and used for generating laser pulses to irradiate the surface of the wood material to be detected so as to generate ultrasonic signals; the signal receiver is arranged on the other side of the detection table and used for receiving ultrasonic signals; and the signal processing equipment is connected with the signal receiver and is used for processing the ultrasonic signals so as to detect the defects of the wood material to be detected. Through above-mentioned mode, this application improves wooden material defect detecting's efficiency and precision.
Description
Technical Field
The application relates to the technical field of material detection, in particular to a wood material defect detection system.
Background
The traditional wood material defect detection technology mainly depends on an operator to hold a small hammer for knocking, an X-ray detector and the like.
The detection method for the small hammer-holding knocking of the operator refers to the fact that the operator can knock a stress sensor hung on the wood through the small hammer-holding knocking, uncertain factors exist in the detection method, the knocking force, the knocking time interval, the knocking position, the knocking angle, the contact area and the like at each time are changed randomly, and the detection result is difficult to truly reflect the health condition of the wood structure. The X-ray is used for nondestructive detection, the X-ray is not sensitive to defects, the X-ray is harmful to human bodies, and the protection cost is high.
Disclosure of Invention
The technical problem that this application mainly solved provides a wooden material defect detecting system, can improve wooden material defect detecting's efficiency and precision.
In order to solve the technical problem, the application adopts a technical scheme that: there is provided a wooden material defect detection system, the system comprising: the detection device comprises a detection table, a pulse excitation unit, a signal receiver and signal processing equipment, wherein the detection table is used for placing a wood material to be detected; the pulse excitation unit is arranged on one side of the detection table and used for generating laser pulses to irradiate the surface z of the wood material to be detected so as to generate ultrasonic signals; the signal receiver is arranged on the other side of the detection table and used for receiving ultrasonic signals; and the signal processing equipment is connected with the signal receiver and is used for processing the ultrasonic signals so as to detect the defects of the wood material to be detected.
The beneficial effect of this application is: be different from prior art's condition, this application is through waiting to detect wooden material and place on examining test table, pulse excitation unit and signal receiver set up respectively and wait to detect the relative both sides of wooden material, pulse excitation unit is used for producing laser pulse irradiation to wait to detect wooden material's surface z, in order to produce ultrasonic signal, signal receiver is used for receiving ultrasonic signal, signal processing equipment connects signal receiver, and handle ultrasonic signal, thereby realize treating to detect wooden material and carry out the defect detection, the wooden material defect detection system easy operation that this application provided, do not rely on the technical merit who is detected personnel, thereby can improve detection efficiency, and signal processing equipment judges to detect wooden material and whether have the defect through handling ultrasonic signal, can improve the precision of testing result.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
FIG. 1 is a schematic structural diagram of an embodiment of a wood material defect detection system according to the present application;
FIG. 2 is a schematic structural diagram of another embodiment of the wood material defect detecting system of the present application;
FIG. 3 is a schematic diagram of a laser scanning detection path in another embodiment of the wood material defect detection system of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
Ultrasonic waves are a part of sound waves, which are inaudible to the human ear and have frequencies above 20KHZ, and have in common with sound waves, that is, they are generated by the vibration of a substance and can only propagate in a medium. The transmission loss of the ultrasonic wave in the solid is small, the detection depth is large, and the ultrasonic wave can generate phenomena of reflection, refraction and the like on a heterogeneous interface, and particularly can not pass through a gas-solid interface. If the material has defects (gas in the defect) such as pores, cracks, delamination and the like or inclusions, the ultrasonic wave is totally or partially reflected when the ultrasonic wave is transmitted to the interface of the material and the defect.
In view of this, the present application provides a wooden material defect detection system 100.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a wood material defect detecting system according to the present application.
The embodiment of the present application provides a wooden material defect detecting system 100, where the system 100 includes: a test station 10, a pulse excitation unit 20, a signal receiver 30 and a signal processing device 40.
The detection table 10 is used for placing the wood material 1 to be detected.
The pulse excitation unit 20 is disposed at one side of the inspection station 10, and is used for generating laser pulses to irradiate the surface z of the wood material 1 to be inspected so as to generate ultrasonic signals.
The signal receiver 30 is disposed at the other side of the test table 10 for receiving the ultrasonic signal.
The pulse excitation unit 20 and the signal receiver 30 may be disposed at opposite sides of the inspection station 10, and the signal receiver 30 receives the ultrasonic signal at the surface of the wooden material 1 opposite to the surface z to be inspected.
And the signal processing device 40 is connected with the signal receiver 30 and is used for processing the ultrasonic signals so as to detect the defects of the wood material 1 to be detected.
The detection table 10 is used for placing the wood material 1 to be detected, so that the wood material 1 to be detected is located at a preset detection position and receives laser pulse radiation.
There are two ways of generating ultrasonic waves by laser, namely generating ultrasonic waves by a thermal etching mechanism and a thermal popping mechanism. Under a thermo-elastic mechanism, laser pulses are radiated on the surface of a material, the surface of the material absorbs laser energy, so that the local temperature of the material is increased, the surface of the material generates thermal expansion, and a non-uniform temperature field is generated on the surface of the material and nearby the surface of the material, so that stress and strain are generated on the surface of the material, transient displacement is generated by excitation, and a surface acoustic wave signal is formed. In the thermal etching mechanism, the laser has a relatively large power, which may damage the surface of the material.
The nondestructive testing is to test the internal performance of the tested piece by adopting a proper testing means on the basis of not damaging the original shape, physical and mechanical properties, chemical properties and the like of the tested piece. In this embodiment, the ultrasonic signal is generated mainly in the thermo-elastic mechanism, and the laser pulse is generated in the thermo-elastic mechanism, so that the wood material 1 to be detected is not damaged, and nondestructive detection is realized.
The ultrasonic waves reflected by the wood material 1 to be detected are received by the signal receiver 30, and the signal processing device 40 analyzes the difference of the maximum peak arrival times of the ultrasonic signals by processing the ultrasonic signals so as to judge whether the interior of the wood material 1 to be detected has defects. The wood material 1 is detected to detect the size and the position of the defect, so that the utilization rate of wood can be improved.
Different from the prior art, the present application places the wooden material 1 to be detected on the detection table 10, the pulse excitation unit 20 and the signal receiver 30 are respectively disposed at two sides of the wooden material 1 to be detected, the pulse excitation unit 20 is used for generating laser pulses to irradiate the surface z of the wooden material 1 to be detected, to generate an ultrasonic signal, a signal receiver 30 for receiving the ultrasonic signal, a signal processing device 40 connected to the signal receiver 30 and processing the ultrasonic signal, thereby realizing the defect detection of the wood material 1 to be detected, the wood material defect detection system 100 provided by the application has simple operation and does not depend on the technical level of the detected personnel, therefore, the detection efficiency can be improved, and the signal processing device 40 can judge whether the wood material 1 to be detected has defects by processing the ultrasonic signals, so that the precision of the detection result can be improved.
Optionally, the signal receiver 30 is a laser vibrometer. Specifically, the signal receiver 30 may adopt an LDV Laser vibrometer, LDV (Laser Doppler velocimeter).
In this embodiment, the laser vibrometer does not contact with the wooden material 1 that awaits measuring, that is to say, the wooden material defect detecting system 100 that this embodiment provided is non-contact detecting system 100, has and detects the precision height, and portable can realize carrying out the advantage that detects by a large scale to the piece that is being tested.
Referring to fig. 2 and fig. 3, fig. 2 is a schematic structural diagram of another embodiment of a wood material defect detecting system according to the present application. FIG. 3 is a schematic diagram of a laser scanning detection path in another embodiment of the wood material defect detection system of the present application.
This embodiment is based on the above embodiment, and further includes the following devices or apparatuses, and this embodiment can be combined with the above-mentioned embodiment of the material defect detecting system 100.
Optionally, the pulse excitation unit 20 includes: a pulsed laser 21, a laser controller 22, and a two-dimensional deflecting galvanometer assembly 23.
The laser controller 22 is connected to the pulse laser 21 to control the pulse laser 21 to generate laser pulses.
The two-dimensional deflecting galvanometer component 23 is arranged on the optical path of the pulse laser 21 and is used for changing the optical path of the laser pulse generated by the pulse laser 21 so as to irradiate the laser pulse to the surface z of the wood material 1 to be detected.
Alternatively, the signal processing device 40 includes: a signal amplifier 41, an analog-to-digital converter 42 and a master control device 43.
The signal amplifier 41 is connected to the signal receiver 30, and the signal amplifier 41 is used for amplifying the ultrasonic signal.
The analog-to-digital converter 42 is connected to the signal amplifier 41, and the analog-to-digital converter 42 is configured to perform analog-to-digital conversion on the amplified ultrasonic signal.
The main control device 43 is connected to the analog-to-digital converter 42, and is configured to process the ultrasonic signal after analog-to-digital conversion, so as to perform defect detection on the wood material 1 to be detected.
In this embodiment, the main control device 43 may be a computer device, and the computer device may include a processor (not shown) and a memory (not shown). Processor 210 may also be referred to as a CPU (Central Processing Unit). The processor 210 may be an integrated circuit chip having signal processing capabilities. The processor 210 may also be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The memory stores a computer program which, when executed, enables automatic detection of the wooden material 1.
In one embodiment, the analog-to-digital converter 42 may be an analog-to-digital signal acquisition card. The analog-digital signal acquisition card can be embedded into a computer case, has high response speed and acquisition precision and is convenient to carry.
Optionally, the pulse excitation unit 20 further comprises a galvanometer controller 24.
The galvanometer controller 24 is connected with the two-dimensional deflection galvanometer assembly 23, and the galvanometer controller 24 is used for controlling the deflection angle of the two-dimensional deflection galvanometer assembly 23.
Optionally, the galvanometer controller 24 and the laser controller 22 may both be communicatively coupled to the master device 43. The master control device 43 further controls the pulse laser 21 to generate laser pulses by controlling the laser controller 22. The master device 43 can further control the deflection angle of the two-dimensional deflection galvanometer assembly 23 precisely by controlling the galvanometer controller 24.
It should be noted that the galvanometer controller 24 and the laser controller 22 may be two independent devices, or may be integrated in the same device to implement both galvanometer control and laser control.
The light path of the laser pulse generated by the pulse laser 21 is changed by controlling the deflection angle of the two-dimensional deflection galvanometer component 23, so that the laser pulse irradiates the surface z of the wood material 1 to be detected, and further, the light path of the laser pulse incident into the two-dimensional deflection galvanometer component 23 can be changed to different degrees by continuously adjusting the deflection angle of the two-dimensional deflection galvanometer component 23 in the detection process, so that the laser pulse irradiates different positions of the surface z of the wood material 1 to be detected, and the scanning detection of the wood material 1 to be detected is realized.
Alternatively, the two-dimensional galvanometer deflection assembly 23 may include two optical galvanometers (not shown) and two motors (not shown), the two optical galvanometers are respectively disposed on the two motors, and the galvanometer controller 24 adjusts the deflection angles of the two optical galvanometers by controlling the deflection angles of the two motors.
The main control device 43 can control the deflection angles of the two motors of the two-dimensional deflection galvanometer component 23 through the galvanometer controller 24, radiate the laser beams input to the two optical galvanometers to the surface z of the wood material 1 to be detected, and can radiate the laser beams input to the two optical galvanometers to different positions of the surface z of the wood material 1 to be detected by continuously adjusting the deflection angles of the optical galvanometers according to a preset time sequence, so as to realize the scanning detection of the wood material 1 to be detected.
Referring to fig. 3, in the present embodiment, the scanning detection path includes a plurality of trace points d and a moving direction (indicated by an arrow in the figure) between adjacent trace points d. The scanning detection path of the pulse laser to the wood material 1 to be detected is scanning movement from left to right and from top to bottom in sequence.
The main control device 43 can also control the change of the deflection angle of the optical galvanometer through the galvanometer controller 24, so that the distance between adjacent scanning points at intervals can be adjusted, and the detection efficiency and precision can be further controlled to meet different detection requirements.
In other embodiments, the angle of the two-dimensional deflecting galvanometer assembly 23 may also be fixed, that is, the laser excitation point on the wood material 1 to be detected is fixed with the receiving point, and the scanning detection of the wood material 1 to be detected is realized by other manners, which is not limited in this application.
For example, the laser beam may be irradiated to different positions of the surface z of the wooden material 1 to be detected by moving the wooden material 1 to be detected.
In one embodiment, the test station 10 may include: a drive means 11 and a carrier 12.
The supporting body 12 is used for supporting the wood material 1 to be detected; the driving device 11 is used for driving the carrier 12 to move so as to place the wood material 1 to be detected carried by the carrier at the detection position.
The driving device 11 may also be in communication connection with the main control device 43, and the main control device 43 may control the driving device 11 to act, so as to drive the carrier 12 to move, and make the wood material 1 to be detected move along a first direction and a second direction perpendicular to each other, where a plane of the first direction and the second direction is parallel to the surface z of the wood material 1 to be detected, which is irradiated by the laser pulse. The main control device 43 controls the wood material 1 to be detected to move along the first direction and the second direction which are parallel and perpendicular to each other, so that the precision of position movement can be improved, and scanning detection of the wood material 1 to be detected is realized.
In one embodiment, as shown in fig. 2, the driving device 11 may include two stepping motors, and the carrier 12 may be a timing belt engaged with output shafts of the two stepping motors. Both stepper motors can be in communication connection with the master control device 43, and the master control device 43 can control the rotation of the stepper motors, so that the conveyor belt and the motors move simultaneously. The number of the synchronous belts can be two or more.
When the device is used, the conveyor belt is kept horizontal as much as possible, so that the phenomenon that the wooden material 1 is born on the surface of the conveyor belt to cause the slippage between the conveyor belt and the motor is avoided.
The moving interval and moving speed of the conveyor belt can be adjusted by computer software in the main control device 43, so that the scanning interval and scanning speed can be adjusted.
Optionally, the system 100 may further comprise a position sensor 50, the position sensor 50 being provided at the detection position, the position sensor 50 being used for detecting whether the wooden material 1 is to be detected at the detection position. The position sensor 50 may be an infrared sensor.
The position sensor 50 can also be in communication connection with the main control device 43, and after the main control device 43 receives the detection signal of the position sensor 50, the main control device 43 judges whether the detection position of the wood material 1 is to be detected or not, so as to automatically control the laser controller 22, the signal receiver 30, the signal processing device 40 and the like to start to operate, thereby realizing automatic detection, saving manpower, reducing detection cost and improving detection efficiency. For example, when the infrared sensor detects that the wood material 1 to be detected reaches the detection position, the main control device 43 controls the pulse laser 21 to generate a trigger pulse through the laser controller 22 and irradiate the trigger pulse on the two-dimensional deflection galvanometer assembly 23, controls the deflection angles of two motors of the two-dimensional deflection galvanometer through the galvanometer controller 24, radiates the laser beam input to the two-dimensional deflection galvanometer onto the surface z of the wood material 1 to be detected, and can realize the scanning detection of the wood material 1 to be detected. For another example, when the infrared sensor detects that the wooden material 1 reaches the detection position, the main control device 43 may further control the driving device 11 to move, so as to drive the supporting body 12 to move, and move the wooden material 1 to be detected along the first direction and the second direction parallel to and perpendicular to each other according to the preset time sequence, thereby implementing the scanning detection of the wooden material 1 to be detected.
Optionally, the system 100 may further comprise an image acquisition device (not shown) for acquiring position information and surface image information of the wooden material 1 to be detected.
The image acquisition device can be a plurality of cameras to acquire the image information of the different surfaces of the wood material 1 to be detected.
The image acquisition device can also be in communication connection with the main control device 43, and after the main control device 43 receives the detection signal of the position sensor 50, the main control device 43 judges whether the detection position of the wood material 1 needs to be detected or not, so as to automatically control the laser controller 22, the signal receiver 30, the signal processing device 40 and the like to start to operate, thereby realizing automatic detection, saving labor, reducing detection cost and improving detection efficiency. That is, the image capturing device can function as the position sensor 50, and the specific contents can be referred to the above description.
In addition, the image acquisition device can be in communication connection with the main control device 43 and transmit the surface image information of the wood material 1 to the main control device 43, and the main control device 43 can perform image processing on the surface image information of the wood material 1 to identify the surface defect of the wood material 1. By arranging the image acquisition device, the wooden material defect detection system 100 provided by the embodiment can automatically identify and detect the internal and surface defects of the wooden material 1, and improve the detection efficiency.
Optionally, after the main control device 43 performs image processing on the surface image information of the wooden material 1 and identifies the surface defect of the wooden material 1, the scanning detection path of the wooden material 1 to be detected by the pulse laser may be re-planned or changed according to the surface defect information of the wooden material 1, so that all the track points d on the scanning detection path are not located at the position where the surface defect is located, thereby further improving the defect detection accuracy.
Be different from prior art's condition, this application is through waiting to detect wooden material and place on examining test table, pulse excitation unit and signal receiver set up respectively and wait to detect the relative both sides of wooden material, pulse excitation unit is used for producing laser pulse irradiation to waiting to detect the surface of wooden material, in order to produce ultrasonic signal, signal receiver is used for receiving ultrasonic signal, signal processing equipment connects signal receiver, and handle ultrasonic signal, thereby realize treating to detect wooden material and carry out the defect detection, the wooden material defect detection system easy operation that this application provided, do not rely on the technical merit who is detected personnel, thereby can improve detection efficiency, and signal processing equipment judges to detect wooden material and whether have the defect through handling ultrasonic signal, can improve the precision of testing result.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A wooden material defect detection system, characterized in that the system comprises:
the detection table is used for placing the wood material to be detected;
the pulse excitation unit is arranged on one side of the detection table and used for generating laser pulses to irradiate the surface of the wood material to be detected so as to generate ultrasonic signals;
the signal receiver is arranged on the other side of the detection table and used for receiving the ultrasonic signal;
and the signal processing equipment is connected with the signal receiver and is used for processing the ultrasonic signal so as to detect the defects of the wood material to be detected.
2. The wooden material defect detection system as claimed in claim 1,
the pulse excitation unit includes:
a pulsed laser;
the laser controller is connected with the pulse laser to control the pulse laser to generate laser pulses;
and the two-dimensional deflection galvanometer component is arranged on a light path of the pulse laser and is used for changing the light path of the laser pulse generated by the pulse laser so as to enable the laser pulse to irradiate the surface of the wood material to be detected.
3. The wooden material defect detection system as claimed in claim 1,
the signal processing apparatus includes:
the signal amplifier is connected with the signal receiver and used for amplifying the ultrasonic signal;
the analog-to-digital converter is connected with the signal amplifier and is used for performing analog-to-digital conversion on the ultrasonic signal after amplification treatment;
and the main control equipment is connected with the analog-to-digital converter and is used for processing the ultrasonic signal after analog-to-digital conversion so as to detect the defects of the wood material to be detected.
4. The wooden material defect detection system as claimed in claim 2,
the pulse excitation unit further includes:
and the galvanometer controller is connected with the two-dimensional deflection galvanometer component and is used for controlling the deflection angle of the two-dimensional deflection galvanometer component.
5. The wood material defect detecting system of claim 4, wherein the two-dimensional deflecting galvanometer assembly comprises two optical galvanometers and two motors, the two optical galvanometers are respectively disposed on the two motors, and the galvanometer controller adjusts the deflection angles of the optical galvanometers by controlling the deflection angles of the two motors.
6. The wooden material defect detection system as claimed in claim 1,
the detection station includes:
the bearing body is used for bearing the wood material to be detected;
and the driving device is used for driving the bearing body to move so as to place the wood material to be detected borne by the conveying device at a detection position.
7. The wood material defect detecting system of claim 6, further comprising a position sensor disposed at the detection position, the position sensor being configured to detect whether the wood material to be detected is present at the detection position.
8. The wood material defect detection system of claim 7, wherein the position sensor is an infrared sensor.
9. The wood material defect detecting system according to claim 1, further comprising an image capturing device for acquiring position information and surface image information of the wood material to be detected.
10. The wood material defect detection system of claim 1, wherein the signal receiver is a laser vibrometer.
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| CN201911002454.1A CN110988118A (en) | 2019-10-21 | 2019-10-21 | Wood material defect detection system |
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| CN201911002454.1A CN110988118A (en) | 2019-10-21 | 2019-10-21 | Wood material defect detection system |
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