CN114814266A - Arc centripetal array speed measurement probe and speed measurement method - Google Patents
Arc centripetal array speed measurement probe and speed measurement method Download PDFInfo
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- 239000000523 sample Substances 0.000 title claims abstract description 124
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- 239000013307 optical fiber Substances 0.000 claims description 42
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
Abstract
The invention discloses an arc centripetal array speed measuring probe, which comprises a light beam convergence control module and an array speed measuring probe module which are adjacently arranged; the array speed measurement probe module provides a plurality of emergent rays, and the light beam convergence control module converges the plurality of emergent rays onto a focus of the light beam convergence control module; the focus is positioned at the circle center of the section of the convex surface part of the material to be detected; the array speed measurement probe module receives light reflected by the convex surface part to be measured of the material to be measured. The invention also discloses a single-row arc centripetal array speed measurement method. According to the single-row arc centripetal array speed measurement probe and the speed measurement method, the size of a convergence focus within 1mm can be realized, and the positioning precision can reach 0.02 mm; the debugging and mounting contents of the invention on site are only one item, so the process of point-by-point mounting and aligning of the isolated probe is avoided, and the time and the labor cost are greatly saved.
Description
Technical Field
The invention relates to the technical field of transient photoelectric testing under high-voltage loading, in particular to an arc centripetal array speed measuring probe and a speed measuring method.
Background
The speed history of the surface of the material under high-pressure loading is an important parameter for researching the dynamic mechanical property and the state equation of the material. The conventional testing method is that a series of speed measuring probes are arranged on a probe target stand at a certain distance from the surface of a detected target and used for testing the speed characteristics of different areas on the surface of a material, because the propagation characteristics of detonation waves are inconsistent in speed jump and development history at different positions, the spatial distribution characteristics of the speed of each part of the material under detonation loading are accurately obtained, and a plurality of single-point speed measuring probes can only be installed in local areas as densely as possible.
The invention patent with the prior art application number of 202010003693.5 discloses a speed vector measurement optical fiber sensor and a measurement method, wherein the speed vector measurement optical fiber sensor comprises a first optical fiber probe, a second optical fiber probe, a third optical fiber probe and a fourth optical fiber probe, the four optical fiber probes respectively comprise two parts, namely a front end focusing lens and a probe tail fiber, and the front end focusing lens parts of the four optical fiber probes are arranged in a protective sleeve. The fourth optical fiber probe is arranged at the position coaxial with the protective sleeve; the first optical fiber probe, the second optical fiber probe and the third optical fiber probe are uniformly distributed along the circumferential direction of the fourth optical fiber probe at intervals of 120 degrees and keep a fixed inclination angle theta with the fourth optical fiber probe. The speed vector measurement optical fiber sensor can accurately calculate and obtain the direction and the magnitude of the vector movement speed of the movement target surface, and overcomes the defect that the traditional laser interference speed measurement can only obtain the speed along the direction of an optical fiber probe. In the technology, the probe adopts a detection mode of a plurality of single-point speed measurement probes, and the vector decomposition of the speed is carried out through the included angle of the single-point speed measurement probes, so that the accurate calculation of the speed is realized. It has several problems, however:
(1) the four optical fiber probes can only be installed by a probe target stand, and the precision has a certain problem when the four optical fiber probes are installed on site, generally, the convergence focus of a plurality of optical fiber probes installed on site is more than 5mm, and the single-point probe on site is limited by the precision limit and tolerance limit of installation and processing, and can only realize the positioning precision of about 0.2 mm.
(2) The single-point speed measurement probe is adopted, a plurality of probes are often required to be installed at one measuring point, each probe is required to be installed and aligned point by point in an isolated mode, and the plurality of probes are required to be calibrated in a coordinated mode, so that time and labor are wasted in installation.
Disclosure of Invention
The technical problem to be solved by the invention is that in the prior art, in order to obtain the speed history of the material on the surface under high-pressure loading, a plurality of optical fiber probes are required to be additionally arranged at local positions, so that the influence of field installation precision is avoided, and the time and labor are wasted in the installation process.
The invention is realized by the following technical scheme:
an arc centripetal array speed measurement probe comprises a light beam convergence control module and an array speed measurement probe module which are adjacently arranged;
the array speed measurement probe module provides a plurality of emergent rays, and the light beam convergence control module converges the plurality of emergent rays onto a focus of the light beam convergence control module; the focus is positioned at the circle center of the section of the convex surface part of the target to be measured;
the array speed measurement probe module receives light reflected by the convex surface part to be measured of the material to be measured.
In the prior art, as in the invention patent with application number 202010003693.5, during actual use, the field installation accuracy is often much smaller than that of a common device during processing, and in the invention patent, at least four probes need to be installed, and errors during installation are sequentially superposed; meanwhile, when the calibration is carried out, because the included angle between the probes is needed to be used in the calculation of the rear end, and the relative position between the probes and the material to be measured is also needed to be ensured in the calibration process, a large amount of time and labor are needed for the calibration.
When the method is applied, the method is also applied to the speed detection of the convex part of the material under the detonation loading; the array speed measurement probe module is used for providing a plurality of paths of parallel emergent detection light beams, such as laser or any other light beam capable of carrying out speed measurement detection; the light beam convergence control module is used for converging the light provided by the array speed measuring probe module to a focus. When the speed is measured, because the focus is located at the center of the cross section of the convex surface of the material to be measured, and the material to be measured is generally cylindrical, spherical or other shapes with circular cross sections, when the emergent light irradiates the surface of the convex surface of the material to be measured, the light passing through the center of the circle can be reflected back to the array speed measurement probe module by the original path.
During loading, explosive, detonator or other modes capable of generating detonation waves are used for loading, and the generated detonation waves are propagated along the material to be tested, so that the convex surface part of the material to be tested generates speed distribution. The inventor finds that at the moment, because the detonation waves are basically uniformly distributed to the pressure of the same section, the deformation distribution of the convex surface part of the material to be detected along the circumferential direction is also basically uniform, the light reflected by the convex surface part of the material to be detected can also return to the probe along the diameter direction of the section of the convex surface part, and then the light beam is reversely input to the array speed measurement probe module by the light beam convergence control module, so that the collection of reflected light signals is completed, a subsequent system can obtain a speed measurement result according to the reflected light signals and emergent light, the speed measurement result is data continuous along time, and the speed measurement result can be used for representing the speed history of the material on the lower surface under high-pressure loading.
Compared with the prior art, most of calibration work of the technical scheme adopted by the invention is finished during probe processing, such as emergent light path debugging of an array speed measurement probe module and light beam focusing debugging of a light beam convergence control module, can be controlled in a fine machining mode, compared with the convergence focus size of about 5mm installed on site, the invention can realize the convergence focus size within 1mm, and compared with the positioning precision of 0.2mm installed on site, the invention only needs to debug an installation position on site, namely, the focus is aligned with the center of a circle of the section of the convex surface part of the material to be measured, so that the positioning precision can be improved by one order of magnitude and reaches the positioning precision of 0.02 mm; the debugging and mounting contents of the invention on site are only one item, so the process of point-by-point mounting and aligning of the isolated probe is avoided, and the time and the labor cost are greatly saved.
Furthermore, the array speed measurement probe module comprises an optical fiber base and a plurality of speed measurement optical fibers arrayed on the optical fiber base; the end face of the speed measuring optical fiber faces the light beam convergence control module.
Furthermore, a plurality of speed measuring optical fibers are arranged on the optical fiber base in a positioning plate punching installation mode.
Further, the light beam convergence control module adopts a plano-convex lens; the plane of the plano-convex lens faces the array speed measurement probe module, and the convex surface of the plano-convex lens faces the convex surface part of the material to be measured; the focus of the plano-convex lens is the focus of the light beam convergence control module.
Further, the plano-convex lens is a cylindrical plano-convex lens; and the focal axis of the cylindrical plano-convex lens is coincided with the axis of the convex part of the material to be detected.
Furthermore, speed measuring optical fibers in the array speed measuring probe module are arranged in a plurality of rows along the focal axis direction of the cylindrical plano-convex lens.
Furthermore, the array speed measuring probe module adopts a linear array speed measuring probe.
Further, the light beam convergence control module adopts a lens group, and the focus of the lens group is arranged on one side of the lens group facing the convex surface part of the material to be measured; the focus of the lens group is the focus of the light beam convergence control module.
Furthermore, the light beam convergence control module and the array speed measurement probe module are integrally processed.
The speed measurement method of the arc centripetal array speed measurement probe comprises the following steps:
arranging an arc centripetal array speed measuring probe close to a convex surface part of a material to be measured, wherein the focus of the light beam convergence control module is positioned at the circle center of the section of the convex surface part of the material to be measured;
the array speed measurement probe module emits a plurality of emergent rays, and the plurality of emergent rays form a detection light spot on the convex surface part of the material to be detected after being focused by the light beam convergence control module; the array speed measurement probe module simultaneously receives the reflected light of the convex surface part of the material to be measured;
and when the detonation loading is carried out on the material to be tested, acquiring the speed data of the material to be tested under the detonation loading condition according to the emergent light and the reflected light.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention relates to an arc centripetal array speed measuring probe and a speed measuring method, wherein most of calibration work is finished when the probe is processed, such as emergent light path debugging of an array speed measuring probe module and light beam focusing debugging of a light beam convergence control module, can be controlled in a finish machining mode, compared with the convergence focus size of about 5mm installed on site, the invention can realize the convergence focus size within 1mm, and compared with the positioning precision of 0.2mm installed on site, the invention only needs to debug an installation position on site, namely, the focus is aligned with the center of a circle of the section of a convex surface part of a material to be measured, so the positioning precision can be one order of magnitude and reach the positioning precision of 0.02 mm; the debugging and mounting contents of the invention on site are only one item, so the process of point-by-point mounting and aligning of the isolated probe is avoided, and the time and the labor cost are greatly saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of an embodiment of the present invention;
FIG. 3 is a schematic diagram of an embodiment of the present invention.
Reference numbers and corresponding part names in the drawings:
the system comprises a light beam convergence control module, a 2-array speed measurement probe module, 21-speed measurement optical fibers and 22-optical fiber bases.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.
Examples
As shown in fig. 1, the radial array probe of the present invention comprises a light beam convergence control module 1 and an array probe module 2 which are adjacently disposed;
the array speed measurement probe module 2 provides a plurality of emergent rays, and the light beam convergence control module 1 converges the plurality of emergent rays to a focus of the light beam convergence control module 1; the focus is positioned at the circle center of the section of the convex surface part of the material to be detected;
the array speed measurement probe module 2 receives light reflected by the convex surface part to be measured of the material to be measured.
As shown in FIG. 2, in the implementation of the present embodiment, the present embodiment is applied to the speed detection of the convex portion of the material under detonation loading; the array speed measurement probe module 2 is used for providing emergent light rays, such as laser or any other light beam capable of performing speed measurement detection; the light beam convergence control module 1 is used for converging light provided by the array speed measuring probe module to a focus. When the speed is measured, because the focus is located at the center of the cross section of the convex surface of the material to be measured, and the material to be measured is generally cylindrical, spherical or in other shapes with circular cross sections, when the emergent light irradiates the surface of the convex surface of the material to be measured, the light passing through the center of the circle can be reflected back to the array speed measurement probe module by the original path.
During loading, explosive, detonator or other modes capable of generating detonation waves are used for loading, and the generated detonation waves are propagated along the material to be tested, so that the convex surface part of the material to be tested generates speed distribution. Light reflected by the convex surface part of the material to be measured returns to the probe along the diameter direction of the section of the convex surface part, and is reversely input to the array speed measurement probe module 2 through the light beam convergence control module 1 to complete the collection of reflected light signals, a subsequent system can obtain a speed measurement result according to the reflected light signals and emergent light, and the speed measurement result is data continuous along time and can be used for representing the speed history of the material on the lower surface under high-pressure loading.
Compared with the prior art, most of calibration work of the technical scheme adopted by the invention is finished during probe processing, such as emergent light path debugging of an array speed measurement probe module and light beam focusing debugging of a light beam convergence control module, can be controlled in a fine machining mode, compared with the convergence focus size of about 5mm installed on site, the invention can realize the convergence focus size within 1mm, and compared with the positioning precision of 0.2mm installed on site, the invention only needs to debug an installation position on site, namely, the focus is aligned with the center of a circle of the section of the convex surface part of the material to be measured, so the positioning precision can be one order of magnitude and reach the positioning precision of 0.02 mm; the debugging and mounting contents of the invention on site are only one item, so the process of point-by-point mounting and aligning of the isolated probe is avoided, and the time and the labor cost are greatly saved.
In one embodiment, the array tachometer probe module 2 comprises a fiber base 22 and a plurality of tachometer fibers 21 arrayed on the fiber base 22; the end surface of the speed measuring optical fiber 21 faces the light beam convergence control module 1.
When the embodiment is implemented, the optical fiber base 22 is used for installing the speed measurement optical fiber 21 to form the speed measurement optical fiber 21 array, the array should be completed in a finish machining environment, and the specific implementation mode can be realized by adopting positioning plate punching installation or directly adopting one or more groups of linear array speed measurement probe modules.
In this embodiment, the speed measuring optical fiber 21 should converge control module 1 towards the light beam, and the control of the orientation of the speed measuring optical fiber 21 can be realized by the optical path control in the prior art, as an implementation scheme of this embodiment, the optical path output of the speed measuring optical fiber 21 can be set to be a parallel mode, the processing difficulty is lower by this mode, and the matching and debugging with the light beam convergence control module 1 are relatively easier.
In one embodiment, the light beam convergence control module 1 adopts a plano-convex lens; the plane of the plano-convex lens faces the array speed measurement probe module 2, and the convex surface of the plano-convex lens faces the convex surface part of the material to be measured; the focal point of the plano-convex lens is the focal point of the light beam convergence control module 1.
When this embodiment is implemented, adopt plano-convex lens to compare in biconvex lens, the light debugging degree of difficulty further reduces to the light reflection loss of part light when having reduced the convex surface.
As shown in fig. 1, in one embodiment, the plano-convex lens is a cylindrical plano-convex lens; and the focal axis of the cylindrical plano-convex lens is coincided with the axis of the convex part of the material to be detected.
When the embodiment is implemented, as shown in fig. 3, the material to be tested is a hollow cylinder, the convex surface part of the material to be tested is the outer surface of the hollow cylinder, explosive is detonated by a detonator to generate detonation waves in the hollow cylinder, the detonation waves propagate along the inside of the hollow cylinder, the detonation waves are usually shock waves at supersonic speed, the shock waves load the inner wall of the hollow cylinder when passing through the hollow cylinder, so that the hollow cylinder is used for loading experiments, and the method is mainly used for testing the performance of equipment and materials in some military fields. In this embodiment, the focal axis refers to an axis formed by the focal points of each section of the cylindrical plano-convex lens, and the axis of the convex surface portion of the material to be measured refers to a central axis of the hollow cylinder along the length direction.
The cylindrical plano-convex lens is adopted as the plano-convex lens in the embodiment, and the focal axis of the cylindrical plano-convex lens is coincident with the axis of the convex surface part of the material to be detected, so that the cylindrical plano-convex lens is actually arranged on the convex surface part of the material to be detected in parallel, namely, when the cylindrical plano-convex lens is adopted for testing, the history of speed change of the convex surface part of the material to be detected along the axis in a very long range along the axis of the hollow cylinder can be detected.
In one embodiment, the velocimetry optical fibers 21 in the array velocimetry probe module 2 are arranged in a plurality of rows along the focal axis direction of the cylindrical plano-convex lens.
In this embodiment, the speed measuring fibers 21 in the array speed measuring probe module 2 are not only arranged in one row, but form a rectangular array, wherein the number of rows of the speed measuring fibers 21 arranged along the focal axis direction of the cylindrical plano-convex lens determines the test length of this embodiment, and the number of rows of the speed measuring fibers 21 arranged along the direction perpendicular to the focal axis direction of the cylindrical plano-convex lens determines the test width of this embodiment.
In another embodiment, the array tachometer probe module 2 adopts a linear array tachometer probe.
In another embodiment, the light beam convergence control module 1 adopts a lens group, and the focus of the lens group is arranged on one side of the lens group facing the convex surface part of the material to be measured; the focus of the lens group is the focus of the light beam convergence control module 1.
In the present embodiment, since the technical solutions of the present embodiment can be implemented by the prior art and various solutions that can converge light beams to the same focus, which are derived along with the development of the optical focusing technology in the future, as another implementation, the present embodiment implements the function of the light beam convergence control module 1 by using a lens group, and implements the speed detection of the convex surface portion of the material to be detected in the present embodiment by using the reversibility of the optical path.
In one embodiment, preferably, the light beam convergence control module 1 and the array tachometer probe module 2 are integrally processed. Through the fine processing means, the light beam convergence control module 1 and the array speed measurement probe module 2 are integrally processed, the process of probe installation in a field can be effectively reduced, manpower and material resources are saved, and the detection precision is improved.
In one embodiment, a method for measuring speed of a single-row arc centripetal array speed measuring probe can be used for measuring speed by using the speed measuring probe in any one of the above embodiments, and the method comprises the following steps:
s1: arranging a single-row arc centripetal array speed measuring probe close to a convex surface part of a material to be measured, wherein the focus of the light beam convergence control module 1 is positioned at the circle center of the section of the convex surface part of the material to be measured;
s2: the array speed measurement probe module 2 emits a plurality of emergent rays, and the plurality of emergent rays form a detection light spot on the convex surface part of the material to be detected after being focused by the light beam convergence control module 1; the array speed measurement probe module 2 simultaneously receives the reflected light of the convex surface part of the material to be measured;
s3: and when the detonation loading is carried out on the material to be tested, acquiring the speed data of the material to be tested under the detonation loading condition according to the emergent light and the reflected light.
In the present embodiment, it is preferable to define the order of steps, i.e., to execute in order from S1 to S3.
However, in another embodiment, S2 and S3 may be performed as a synchronous process, i.e., after the installation is completed through the installation step S1, S2 and S3 may be performed simultaneously.
In this embodiment, the installation step is completed first, and the single-row arc centripetal array speed measurement probe is arranged close to the convex surface portion of the material to be measured, where the close arrangement refers to that the probe is installed at a position where the speed of the convex surface portion of the material to be measured can be detected, and the position needs to meet the condition that the focus of the light beam convergence control module 1 is located at the center of the circle of the cross section of the convex surface portion of the material to be measured;
and executing S2 and S3 after the installation is finished, wherein emergent rays form a detection light spot when hitting the convex surface part of the material to be detected, and meanwhile, the convex surface part of the material to be detected reflects the emergent rays into reflected rays.
Therefore, the light paths of the reflected light and the emergent light are overlapped, due to the reversibility of the light paths, the reflected light can be incident to the optical fiber in the array speed measuring probe module 2 corresponding to the emergent light along the opposite direction of the emergent light, the back-end equipment can receive the emergent light data and the reflected light data corresponding to the emergent light, after the detonation experiment is started, due to the Doppler effect, the difference can occur between the reflected light data and the emergent light data, mainly the difference of frequency and wavelength, the speed of the material on the lower surface of the high-pressure loading can be accurately calculated according to the difference, and as the testing process is a continuous process, the speed history of the material on the lower surface of the high-pressure loading can be obtained.
In an embodiment, the embodiment is implemented in a fund project of researches on a macroscopic and microscopic mechanism of expansion and fracture of a ductile metal cylindrical shell under explosive loading with a project approval number of 11932018, wherein the array speed measurement probe module 2 adopts a double-row two-dimensional linear array speed measurement probe, the point distance is 0.5mm, each row of 16 measurement points is 1.5mm, 32 measurement points can be simultaneously detected, the length of the integrated probe is less than 1.5cm, the thickness is only 3mm, and the installation is very convenient.
In another embodiment, unlike the previous embodiment, the implementation is carried out in the fund project of the control mechanism research of the multiple adiabatic shear bands with the project approval number of 12072332, and the control mechanism expansion, and the application effect is also very good.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An arc centripetal array speed measurement probe is characterized by comprising a light beam convergence control module (1) and an array speed measurement probe module (2) which are arranged adjacently;
the array speed measurement probe module (2) provides a plurality of emergent rays, and the light beam convergence control module (1) converges the plurality of emergent rays to the focus of the light beam convergence control module (1); the focus is positioned at the circle center of the section of the convex surface part of the material to be detected;
the array speed measurement probe module (2) receives light reflected by the convex surface part to be measured of the material to be measured.
2. An arc centripetal array tacho probe according to claim 1, wherein said array tacho probe module (2) comprises a fiber base (22) and a plurality of tacho fibers (21) arrayed on said fiber base (22); the end face of the speed measuring optical fiber (21) faces the light beam convergence control module (1).
3. An arc centripetal array speed-measuring probe according to claim 2, wherein a plurality of said speed-measuring optical fibers (21) are mounted on said optical fiber base (22) by means of positioning plate punching.
4. An arc centripetal array speed-measuring probe according to claim 1, wherein said light beam convergence control module (1) adopts a plano-convex lens; the plane of the plano-convex lens faces the array speed measurement probe module (2), and the convex surface of the plano-convex lens faces the convex surface part of the material to be measured; the focal point of the plano-convex lens is the focal point of the light beam convergence control module (1).
5. An arc centripetal array speed measuring probe according to claim 4, wherein said plano-convex lens is a cylindrical plano-convex lens; and the focal axis of the cylindrical plano-convex lens is coincided with the axis of the convex part of the material to be detected.
6. An arc centripetal array speed-measuring probe according to claim 5, wherein the speed-measuring optical fibers (21) in said array speed-measuring probe module (2) are arranged in a plurality of rows along the focal axis of said cylindrical plano-convex lens.
7. An arc centripetal array tacho probe according to claim 1, wherein the array tacho probe module (2) is a linear array tacho probe.
8. An arc centripetal array speed-measuring probe head according to claim 1, wherein said light beam convergence control module (1) adopts a lens set, the focus of said lens set is arranged on the side of said lens set facing the convex portion of the material to be measured; the focus of the lens group is the focus of the light beam convergence control module (1).
9. An arc centripetal array speed-measuring probe head according to claim 1, wherein said light beam convergence control module (1) and array speed-measuring probe module (2) are integrally formed.
10. A method for measuring the speed of an arc centripetal array speed measuring probe according to any one of claims 1 to 9, comprising the following steps:
arranging an arc centripetal array speed measuring probe close to a convex surface part of a material to be measured, wherein the focus of the light beam convergence control module (1) is positioned at the circle center of the section of the convex surface part of the material to be measured;
the array speed measurement probe module (2) emits a plurality of emergent rays, and the plurality of emergent rays are focused by the light beam convergence control module (1) to form detection light spots on the convex surface part of the material to be detected; the array speed measurement probe module (2) receives the reflected light of the convex surface part of the material to be measured simultaneously;
and when the detonation loading is carried out on the material to be tested, acquiring the speed data of the material to be tested under the detonation loading condition according to the emergent light and the reflected light.
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| CN114814266B (en) | 2023-04-14 |
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