CN109883536A - A kind of three wave point continuous capturing method of shock wave - Google Patents
A kind of three wave point continuous capturing method of shock wave Download PDFInfo
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- CN109883536A CN109883536A CN201910087959.6A CN201910087959A CN109883536A CN 109883536 A CN109883536 A CN 109883536A CN 201910087959 A CN201910087959 A CN 201910087959A CN 109883536 A CN109883536 A CN 109883536A
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Abstract
The present invention relates to a kind of three wave point continuous capturing methods of shock wave, belong to Exploding test field.It is propagated around the impact wave direction formed after explosive initiation, since there are great differences for the atmospheric density of shock front and surrounding, so as to cause the variation of ray refractive index, projection screen is in black, and light variation is made to be easy to be distinguished by high-speed camera and capture.By handling the two adjacent image PS differences captured, provide initial shock wave, reflected-shock involves a Mach bar image, three wave points are provided apart from fire point position by actual range between mark post and image pixel distance conversion, and three wave point height are provided by mark post actual height and image pixel distance conversion.The present invention can be improved the capture effect of high-speed camera shock wave；And it can precisely provide three wave point positions.
Description
Technical field
The present invention relates to a kind of three wave point continuous capturing methods of shock wave, belong to Exploding test field.
Background technique
Explosive after mid-air explosion near the ground, propagated outward with spherical wave by blast wave, when initial shock wave and ground are with one
When determining angle contact, reflected shock wave of the intensity greater than initial shock wave will be generated, since reflected-shock wave velocity is greater than
Initial shock wave, reflected shock wave will gradually pull up to initial shock wave and be combined into the shock wave of reinforcement, i.e. Mach wave, Mach
Wave also known as Mach bar in the shape of a rod.Initial shock wave, back wave, Mach bar intersection point be known as " three wave points ", three wave points are initial
The separation of shock wave and Mach effect.Initial shock wave superpressure value of the explosive after mid-air explosion near the ground is to measure explosive prestige
The important indicator of power, due to the presence of Mach's phenomenon, when carrying out explosive test, it is difficult to which distinguishing obtained data is initially to rush
Hit wave, reflected shock wave or Mach bar.Therefore three wave point positions are accurately provided to be of great significance to blast impulse wave measurement.
Due to the complexity of surface condition, theoretical and numerical simulation technology is all difficult to provide reliable three wave point position, traditional measurement
Method can only not only determine certain by pushing away three wave point positions in the different height placement sensor of the fried point same position of distance come counter
One position, three wave point height, and precision is lower.
Summary of the invention
The problem of cannot achieve the measurement of three wave points the purpose of the present invention is to solve the prior art, provides a kind of shock wave
Three wave point continuous capturing methods.This method captures complete explosion wave communication process by high-speed camera, using image difference
Value calculates and combines post actual range and height to provide three wave point position of different moments.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of three wave point continuous capturing method of shock wave, comprising: protecting wall, high-speed camera, protective glass, is fried through-hole
Medicine, mark post, projection screen and support frame.
Through-hole is provided on the protecting wall, high-speed camera is placed on through hole, and camera lens height is identical as explosive height, leads to
Protective glass is installed close to explosive side in hole, and explosive is placed in the centre distance ground certain altitude of two mark post lines, mark post
Line is vertical with camera lens direction, and projection screen is fastened on support frame, and projection screen plane is parallel to mark post line.
High-speed camera acquired image calculates using adjacent image difference and combines post actual range and height to provide
Three wave point position of different moments.
The course of work:
It is propagated around the impact wave direction formed after explosive initiation, since the atmospheric density of shock front and surrounding exists very
Big difference, so as to cause the variation of ray refractive index, projection screen is in black, and light variation is made to be easy to be caught by high-speed camera differentiation
It catches.By handling the two adjacent image PS differences captured, initial shock wave is provided, reflected-shock involves a Mach bar figure
Picture, three wave points are provided apart from fire point position by actual range between mark post and image pixel distance conversion, three wave point height
It is provided by mark post actual height and image pixel distance conversion.
Beneficial effect
1, a kind of three wave point continuous capturing method of shock wave of the invention, the scheme of the screen provided by the invention that adds drop shadow,
Improve the capture effect of high-speed camera shock wave；
2, a kind of three wave point continuous capturing method of shock wave of the invention, the present invention use adjacent image PS difference processing side
Method can precisely provide three wave point positions.
Detailed description of the invention
Fig. 1 is the equipment arrangement schematic diagram in the present invention；
Fig. 2 is the fixed schematic diagram of projection screen in the present invention；
Fig. 3 (a) and (b) are adjacent two images that high-speed camera captures；Fig. 3 (c) is the preliminary impact in the present invention
Wave processing result figure.
Wherein, 1- protecting wall, 2- through-hole, 3- high-speed camera, 4- protective glass, 5- explosive, 6- mark post, 7- projection screen,
8- support frame.
Specific embodiment
The present invention will be further described with embodiment with reference to the accompanying drawing.
Embodiment 1
A kind of three wave point continuous capturing method of shock wave, comprising: protecting wall 1, through-hole 2, high-speed camera 3, protective glass
4, explosive 5, mark post 6, projection screen 7 and support frame 8.
Protecting wall 1 is reinforced concrete structure, and thickness 500mm, 2 width 300mm of through-hole, high-speed camera 3 is placed on logical
At hole, camera lens height 1m, protective glass 4 is high strength glass, is mounted on protecting wall 1,2 region of through-hole is completely covered.Explosive 6
Quality 500g, placing height 1m, with 1 distance 50m of protecting wall, 5 height 2m of mark post, the distance between two root mark posts 5 are 4m, are fried
Medicine 6 is located at 5 line center of mark post, and 5 line of mark post is vertical with 3 camera lens of high-speed camera, and projection screen 7 is rectangular, material silicon carbide
Ceramics, height 4m, width 8m, thickness 10mm, projection screen plane are parallel to mark post line, and projection screen 7 is fastened on support frame 8,
8 material of support frame is steel, wraps up the vertical portion thickness 10mm of projection screen 7, is provided with the square hole with 7 area equation of projection screen, side
Hole depth 6mm.
The course of work:
It is propagated around the impact wave direction that explosive 6 is formed after detonating, since the atmospheric density of shock front and surrounding exists
Very big difference, so as to cause the variation of ray refractive index, projection screen 7 is in black, is easy light variation by 3rd area of high-speed camera
Divide and captures.Every two adjacent images are placed in different figure layers in PS, difference operation then is carried out to two figure layers, are adjusted
Color range comparison in whole difference operation result images, shows initial shock wave, back wave, Mach bar and three wave point images, three
Wave point is provided apart from fire point position by actual range between mark post 5 and image pixel distance conversion, and three wave point height pass through
5 actual height of mark post is provided with image pixel distance conversion.It is initial that the method provided through the invention can provide different moments
Shock wave, back wave, Mach bar and three wave point positions, shown in preliminary shock wave processing result such as Fig. 3 (c).
Above-described specific descriptions have carried out further specifically the purpose of invention, technical scheme and beneficial effects
It is bright, it should be understood that the above is only a specific embodiment of the present invention, the protection model being not intended to limit the present invention
It encloses, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (4)
1. a kind of three wave point continuous capturing method of shock wave, it is characterised in that: include: protecting wall, through-hole, high-speed camera, prevent
Protect glass, explosive, mark post, projection screen and support frame；
Through-hole is provided on the protecting wall, high-speed camera is placed on through hole, face explosive, and through-hole is installed close to explosive side
Protective glass；Explosive is placed in the center of two mark post lines, and keeps height, mark post line and camera lens side with ground
To vertical；Projection screen is fastened on support frame boat, and projection screen plane is parallel to mark post line.
2. a kind of three wave point continuous capturing method of shock wave as described in claim 1, it is characterised in that: the camera lens height with
Explosive height is identical.
3. a kind of three wave point continuous capturing method of shock wave as described in claim 1, it is characterised in that: the projection screen is deep
Color.
4. such as a kind of above-mentioned any one three wave point continuous capturing method of shock wave described in claim 1, it is characterised in that: three
Wave point, which continuously continues, catches the course of work are as follows: propagates around the impact wave direction formed after explosive initiation, due to shock front and surrounding
Atmospheric density there are great differences, so as to cause the variation of ray refractive index, projection screen is in black, changes light and is easy quilt
High-speed camera, which is distinguished, to be captured；By handling the two adjacent image PS differences captured, initial shock wave, reflection punching are provided
It hits and involves a Mach bar image, three wave points are given apart from fire point position by actual range between mark post and image pixel distance conversion
Out, three wave point height are provided by mark post actual height and image pixel distance conversion.
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| CN201910087959.6A CN109883536B (en) | 2019-01-29 | 2019-01-29 | Shock wave three-wave-point continuous capturing method |
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| CN110006901A (en) * | 2019-04-29 | 2019-07-12 | 北京理工大学 | A kind of Detonation waveform test method |
| CN113514182A (en) * | 2021-06-29 | 2021-10-19 | 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 |
| CN116818568A (en) * | 2023-08-31 | 2023-09-29 | 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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| CN113514182A (en) * | 2021-06-29 | 2021-10-19 | 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 |
| 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 |
| CN116818568A (en) * | 2023-08-31 | 2023-09-29 | 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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