RU2784408C1 - Method for silhouette video recording of a fast process and apparatus for creating a luminous zone - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention relates to technical physics, namely, to the field of silhouette recording of a fast process. The method includes the stages of initiating a chemical transformation in a charge of a pulsed light source containing a photography mixture, installed on the side of a diffusion-scattering screen opposite to the fast process; creating a luminous zone, and performing high-speed video recording of the fast process against the background of the screen. Combustion is initiated in the charge by a low-voltage electric igniter in a pulsed light source containing a powder charge placed with the photography mixture in a closed volume, with a delay for a time determined by the actuation time of the electric igniter and the buildup time of the radiation front relative to the time of the beginning of the recording process. Apparatus for creating a luminous zone for silhouette video recording of a fast process comprises an initiation apparatus linked with the pulsed light source including a photography mixture placed over the charge; comprises a synchronisation apparatus, the input whereof is linked with the recorded process launch apparatus and the output is with the low-voltage initiation apparatus linked with the electric charge igniter of the pulsed light source made in the form of a powder charge and a photography mixture placed in a single cup-shaped body, the open end whereof on the side of the photography mixture is closed with a diaphragm.

EFFECT: improved lighting parameters due to the use of a low-voltage initiation apparatus and apparatus for creating a luminous zone.

2 cl, 3 dwg

Description

SUBSTANCE: group of inventions relates to technical physics, namely to the field of silhouette registration of a fast-flowing process based on devices for initiating an energy composition that ignites and scatters a photo mixture; creation of pulsed light sources on their basis, and can be used in studies in inverted formulation, for example, collisions of test objects with various obstacles.

A known method of obtaining light pulses for high-speed silhouette filming and a device for creating a luminous zone (SI. Gerasimov. Yu.I. Faykov. S.A. Kholin Cumulative light sources. Serov. 2014), including the initiation of an electric detonator by a high-voltage explosive installation simultaneously with the start of the process registration (for example, by initiating the detonation of a charge for throwing an obstacle towards the test object in an inverted setting). The electric detonator initiates a chemical transformation - detonation in an open charge of a high explosive (HE) of a pulsed light source containing a volume of a photo-illuminating composition (photo mixture) placed above the charge, ignited and scattered by detonation products. The light source is installed on one side of the diffusion-scattering screen, I create a luminous zone! on the other side of the screen. High-speed video recording of a fast-flowing process is carried out with a high-speed camera through a mirror (to avoid hitting the camera with fragments) against the background of a diffusely scattering screen with a scale-coordinate ruler installed (for subsequent measurements). The explosive illumination is started simultaneously with the initiation of the explosive, the detonation products of which accelerate the striker-barrier. These method and device are selected as a prototype.

The disadvantages of the specified method of silhouette filming and devices for creating a luminous zone is that. that the resulting light pulses have a relatively sharp rise in the front due to the high initial velocity of expansion of the detonation products. Illumination is carried out behind an extended diffuse-scattering screen, on a bright background of which silhouette filming is performed, which leads to the need to install several pulsed light sources at different points relative to the screen to create a uniform luminous zone. Does this significantly increase the cost of backlighting? at the same time, the presence of an electric detonator and a secondary explosive, even in the case of a single source used, leads to a high cost of the method. The presence of a high-voltage explosive installation leads to interference in the used means of non-contact measuring equipment, and a strong shock wave in the air generated during the detonation of a blasting explosive as part of light sources makes it practically impossible to use pressure sensors placed at a safe distance from the colliding bodies for chronographing successive phases processes accompanying the studied interaction.

The technical problem to be solved by the claimed group of inventions is to improve the achieved lighting parameters (light intensity, pulse duration) with a significant reduction in the cost of the video recording method and the device for creating a luminous zone.

The technical result is achieved due to the fact that in the claimed method of silhouette video recording of a fast process, including the initiation of a chemical transformation in a charge containing a photomixture of a pulsed light source installed on the side of the diffusion-scattering screen opposite to the fast process, the creation of a luminous zone, high-speed video recording of a fast process against the background screen, in contrast to the prototype, combustion is initiated in the charge by a low-voltage electric igniter in a pulsed light source containing a powder charge placed with a photo mixture in a closed volume, with a delay relative to the start of the registration process by a time determined by the response time of the electric igniter and the rise time of the radiation front.

The technical result is also achieved due to the fact that in the claimed device for creating a luminous zone for silhouette video recording of a fast process, containing an initiation device connected to a pulsed light source, including a photographic mixture placed above the charge, unlike the prototype, contains a synchronization device, the input of which is connected with a device for starting the registered process, and the output - with a low-voltage initiating device connected to an electric igniter of a powder charge of a pulsed light source, made in the form of a powder charge and a photomixture, placed in one case in the form of a glass, the open end of which is closed by a diaphragm on the side of the photomixture.

As a result of using the entire set of features of the proposed method and device, the combustion of gunpowder and the ignition of the photo mixture is carried out in a closed housing. When the threshold pressure value is exceeded, the diaphragm ruptures and the burning particles of the photomixture flow into the surrounding space.

Synchronization of the registered process with the operation of the backlight is carried out using a delay block.

The initiation of the powder charge is carried out before starting the main process under study using a low-voltage installation. At the same time, there is no electromagnetic interference and no strong shock waves are generated in the air. The parameters of the low-voltage installation (current, voltage) determine the delay time for the operation of the electric igniter. After reaching the peak luminous intensity, which exceeds the value for the same masses of charge (energy composition) and the mass of the photomixture as in the case of the prototype, a long “shelf” of the light pulse is stored, overlapping but the length of the total time from the operation of the throwing installation (ballistic or explosive) and processes of interaction of the striker with the object of study.

The inventions are illustrated by figures.

In FIG. 1 shows a device for creating a luminous zone for silhouette video recording of a fast-flowing process. In FIG. Figure 2 shows a graph of the irradiance created by a device for creating a luminous zone for silhouette video recording - a prototype with an explosive mass of 28 g and a photographic mixture mass of 12 g, and characteristic values of the amplitude and duration of the phases. On fng. Figure 3 shows the corresponding values of the amplitude and duration of the phases for the proposed device for creating a luminous zone for silhouette video recording of a fast process (gunpowder mass 20 g, photographic mixture mass 12 g, aperture 80 μm A1), obtained at the same distances using the same photodetector.

The device for creating a luminous zone for silhouette video recording of a fast-flowing process contains an initiation device 9 connected to a pulsed light source.

The pulsed light source consists of a housing 6, in the lower part of which an electric igniter 8 is installed. Powder 7 is poured onto the bottom of the housing 6, and a metal photographic mixture 3 is placed above it in a cardboard cap 4. 5. The housing 6 is closed with a lid 2, in which there is a bursting diaphragm 1 .

The input of the synchronization device 10 is connected to a device for starting the process being recorded (not shown in the figure), and the output is connected to a low-voltage initiator 9 connected to an electric igniter 8 for charging a pulsed light source. The parameters of the low-voltage initiator 9 (current, voltage) determine the delay time for the operation of the electric igniter 8 of a pulsed light source installed on one side of the diffusion-scattering screen.

The inventive method of silhouette video recording of a fast process is carried out during the operation of the inventive device to create a luminous zone as follows.

A pulsed light source is installed on the side of the diffusion-scattering screen opposite to the fast-flowing process (not shown in the figure).

The initiation of the combustion of gunpowder 7 is carried out with a delay relative to the start of the registration process (for example, initiation of the detonation of a charge for throwing an obstacle towards the test object in an inverted setting) for a time determined by the response time of the electric igniter 8 and the rise time of the radiation front.

When the electric igniter 8 is activated from the low-voltage initiation device 9 through the synchronization device 10, gunpowder 7 and the combustion products of gunpowder are ignited, destroying the cardboard cap 4, 5. They are mixed with photographic mixture 3. The process of burning gunpowder is accompanied by an increase in pressure in the housing 6 and when a certain pressure value is reached, a rupture occurs diaphragm 1. When diaphragm 1 breaks, high-temperature products of the interaction of gunpowder 7 and photo mixture 3 mixed with each other flow out of housing 6 into the surrounding space, creating a luminous cloud with a projection area of more than 1 m ² , a luminous zone is created. High-speed silhouette video recording of a fast-flowing process is performed against the background of a backlit screen.

After reaching the peak luminous intensity, which exceeds the value for the same masses of charge (energy composition) and the mass of the photomixture as in the prototype, a long “shelf” of the light pulse is stored, overlapping in length the total time from the operation of the throwing installation (ballistic or explosive) and processes of interaction between the striker and the object of study.

Thus, when using the proposed method and device, the achieved lighting parameters (light intensity, pulse duration) are improved with a significant reduction in the cost of the silhouette video recording method due to the use of a low-voltage initiation device and a device for creating a luminous zone.

Claims (2)

1. A method for silhouette video recording of a fast process, including initiating a chemical transformation in a charge containing a photomixture of a pulsed light source installed on the side of a diffusion-scattering screen opposite to the fast process, creating a luminous zone, high-speed video recording of a fast process against the background of the screen, characterized in that initiation is performed burning in a charge with a low-voltage electric igniter in a pulsed light source containing a powder charge placed with a photo mixture in a closed volume, with a delay relative to the start of the registration process by a time determined by the response time of the electric igniter and the rise time of the radiation front. 2. A device for creating a luminous zone for silhouette video recording of a fast-flowing process, containing an initiating device connected to a pulsed light source, including a photographic mixture placed above the charge, characterized in that it contains a synchronization device, the input of which is connected to the device for starting the recorded process, and the output is connected to a low-voltage initiating device connected to an electric igniter of a charge of a pulsed light source, made in the form of a powder charge and a photomixture, placed in one case in the form of a glass, the open end of which is closed by a diaphragm on the side of the photomixture.

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