CN109883536B - Shock wave three-wave-point continuous capturing method - Google Patents
Shock wave three-wave-point continuous capturing method Download PDFInfo
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- CN109883536B CN109883536B CN201910087959.6A CN201910087959A CN109883536B CN 109883536 B CN109883536 B CN 109883536B CN 201910087959 A CN201910087959 A CN 201910087959A CN 109883536 B CN109883536 B CN 109883536B
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Abstract
The invention relates to a continuous capturing method of shock wave three wave points, belonging to the field of explosion testing. The shock wave formed after the explosive is detonated is transmitted to the periphery, the change of the light ray refractive index is caused due to the fact that the shock wave front is greatly different from the density of the air around, the projection screen is black, and the light ray change is easily distinguished and captured by a high-speed camera. The initial shock wave, the reflected shock wave and the Mach rod image are given out by processing the difference value of the two captured adjacent images through the PS, the distance between the three-wave point and the initiation point is given out by converting the actual distance between the mark rods and the image pixel distance, and the height of the three-wave point is given out by converting the actual height of the mark rods and the image pixel distance. The invention can improve the capture effect of the high-speed camera on the shock wave; and the position of the three wave points can be accurately given.
Description
Technical Field
The invention relates to a continuous capturing method of shock wave three wave points, belonging to the field of explosion testing.
Background
After the explosive explodes in the air near the ground, the explosion wave is transmitted outwards in the form of spherical wave, when the initial shock wave contacts the ground at a certain angle, a reflection shock wave with intensity greater than that of the initial shock wave is generated, and because the speed of the reflection shock wave is greater than that of the initial shock wave, the reflection shock wave gradually catches up with the initial shock wave and is combined into a reinforced shock wave, namely, a Mach wave, and the Mach wave is in a rod shape and is also called a Mach rod. The intersection point of the initial shock wave, the reflected wave and the Mach rod is called a triple point, and the triple point is a dividing point of the action of the initial shock wave and the Mach. The initial shock wave overpressure value of the explosive after being exploded in the near-ground air is an important index for measuring the explosive power, and due to the existence of the Mach phenomenon, when the explosive is tested, the obtained data is difficult to distinguish whether the initial shock wave, the reflected shock wave or the Mach rod. Therefore, the accurate position of the three wave points has great significance for measuring the explosion shock wave. Due to the complexity of ground conditions, the reliable positions of the three wave points are difficult to provide by theory and numerical simulation technology, the traditional measuring method reversely infers the positions of the three wave points by arranging sensors at different heights at the same position from a bomb point, and not only can the height of the three wave points at a certain position be determined, but also the precision is low.
Disclosure of Invention
The invention aims to solve the problem that the prior art cannot realize three-wave-point measurement, and provides a continuous shock wave three-wave-point capturing method. The method captures a complete explosion shock wave propagation process through high-speed shooting, calculates by adopting an image difference value and gives three wave point positions at different moments by combining the actual distance and the height of a marker post.
The purpose of the invention is realized by the following technical scheme.
A shock wave three-wave-point continuous capturing method comprises the following steps: protective wall, through-hole, high-speed camera, protective glass, explosive, sighting rod, projection screen and support frame.
The high-speed camera is placed at the through hole, the height of the lens is the same as that of the explosive, protective glass is installed on one side, close to the explosive, of the through hole, the explosive is placed at the position, away from the ground, of the center of a connecting line of the two marker posts by a certain height, the connecting line of the marker posts is perpendicular to the direction of the lens of the camera, the projection screen is fastened on the support frame, and the plane of the projection screen is parallel to the connecting line.
And (3) carrying out high-speed shooting on the acquired image, calculating by adopting the difference value of adjacent images, and giving the positions of three wave points at different moments by combining the actual distance and height of the marker post.
The working process is as follows:
the shock wave formed after the explosive is detonated is transmitted to the periphery, the change of the light ray refractive index is caused due to the fact that the shock wave front is greatly different from the density of the air around, the projection screen is black, and the light ray change is easily distinguished and captured by a high-speed camera. The initial shock wave, the reflected shock wave and the Mach rod image are given out by processing the difference value of the two captured adjacent images through the PS, the distance between the three-wave point and the initiation point is given out by converting the actual distance between the mark rods and the image pixel distance, and the height of the three-wave point is given out by converting the actual height of the mark rods and the image pixel distance.
Advantageous effects
1. According to the shock wave three-wave-point continuous capturing method, the scheme of adding the projection screen improves the capturing effect of the high-speed camera on the shock wave;
2. according to the shock wave three-wave-point continuous capturing method, the adjacent image PS difference value processing method is adopted, and the positions of the three wave points can be accurately given.
Drawings
FIG. 1 is a schematic diagram of the apparatus arrangement of the present invention;
FIG. 2 is a schematic view of a projection screen according to the present invention;
FIGS. 3(a) and (b) show two adjacent images captured by high-speed imaging; FIG. 3(c) is a graph showing the results of preliminary shockwave treatment in the present invention.
The system comprises a protective wall 1, a through hole 2, a high-speed camera 3, protective glass 4, explosive 5, a marker post 6, a projection screen 7 and a support frame 8.
Detailed Description
The invention is further described with reference to the following figures and examples.
Example 1
A shock wave three-wave-point continuous capturing method comprises the following steps: the device comprises a protective wall 1, a through hole 2, a high-speed camera 3, protective glass 4, explosive 5, a post 6, a projection screen 7 and a support frame 8.
The protective wall 1 is a reinforced concrete structure, the thickness of the protective wall is 500mm, the width of the through hole 2 is 300mm, the high-speed camera 3 is placed at the through hole, the height of the lens is 1m, and the protective glass 4 is high-strength glass and is installed on the protective wall 1 to completely cover the area of the through hole 2. The explosive 6 quality 500g places height 1m, 1 distance 50m with the protective wall, the 5 high 2m of sighting rod, the distance between two root sighting rod 5 is 4m, explosive 6 is located sighting rod 5 line center, the sighting rod 5 line is perpendicular with 3 camera lenses of high-speed camera, projection screen 7 is square, material carborundum pottery, height 4m, width 8m, thickness 10mm, the projection screen plane is on a parallel with the sighting rod line, projection screen 7 fastens on support frame 8, the 8 materials of support frame are the steel, the vertical part thickness 10mm of parcel projection screen 7, it has the square hole that equals with projection screen 7 areas to open, square hole degree of depth 6 mm.
The working process is as follows:
the shock wave formed after the explosive 6 is detonated propagates to the periphery, the change of the light refractive index is caused due to the fact that the shock wave front is greatly different from the density of the surrounding air, the projection screen 7 is black, and the light change is easily distinguished and captured by the high-speed camera 3. And (3) placing every two adjacent images in different image layers in the PS, then carrying out difference operation on the two image layers, adjusting the color gradation contrast in the difference operation result image, and displaying an initial shock wave, a reflected wave, a Mach rod and a three-wave point image, wherein the position of the three-wave point from the initiation point is converted by the actual distance between the mark rods 5 and the image pixel distance, and the three-wave point height is converted by the actual height of the mark rods 5 and the image pixel distance. The method provided by the invention can provide initial shock waves, reflected waves, Mach rods and positions of three wave points at different moments, and the initial shock wave processing result is shown in fig. 3 (c).
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, 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 (2)
1. A shock wave three-wave-point continuous capturing method is characterized by comprising the following steps: the device comprises a protective wall, a through hole, a high-speed camera, protective glass, explosive, a post, a projection screen and a support frame;
a through hole is formed in the protection wall, the high-speed camera is placed at the through hole and is opposite to the explosive, and protection glass is installed on one side, close to the explosive, of the through hole; the explosive is placed in the center of a connecting line of the two marker posts, the height of the explosive and the ground is kept, and the connecting line of the marker posts is vertical to the direction of a camera lens of the camera; the projection screen is fastened on the support frame, and the plane of the projection screen is parallel to the connecting line of the marker posts;
the three-wave point continuous capturing method comprises the following steps: shock waves formed after the explosives are detonated are transmitted to the periphery, the change of the light ray refractive index is caused due to the fact that the shock wave front is greatly different from the density of the air around, the projection screen is black, and the light ray change is easily distinguished and captured by a high-speed camera; the method comprises the steps of performing PS difference processing on two captured adjacent images, placing each two adjacent images in different image layers in a PS, then performing difference operation on the two image layers, adjusting color gradation comparison in difference operation result images, and displaying initial shock waves, reflected waves, Mach rods and three-wave point images, wherein the position of a three-wave point from an initiation point is converted through the actual distance between standard rods and the image pixel distance, and the three-wave point height is converted through the actual height of the standard rods and the image pixel distance.
2. The method for continuously capturing shock waves with three wave points according to claim 1, wherein: the height of the lens is the same as that of the explosive.
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| CN110006901B (en) * | 2019-04-29 | 2020-03-10 | 北京理工大学 | Detonation wave waveform testing method |
| CN113514182B (en) * | 2021-06-29 | 2022-12-27 | 西安航天动力测控技术研究所 | Shock wave overpressure field measuring method based on high-speed photographic system |
| CN116818568B (en) * | 2023-08-31 | 2023-11-17 | 中国工程物理研究院流体物理研究所 | Shock wave regulation and control and verification device and method based on optical lens principle |
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| CN106803889A (en) * | 2017-03-08 | 2017-06-06 | 吕盼稂 | A kind of intelligent high-speed image capture method and its device in blast process |
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| CN1601276A (en) * | 2004-10-22 | 2005-03-30 | 谭爱喜 | Fireworks effective image measaring method |
| CN103292943A (en) * | 2012-02-27 | 2013-09-11 | 中国人民解放军总参谋部工程兵科研三所 | Non-contact type impact wave hyperpressure measuring method |
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