SU1191870A1 - High-speed photographic recording device - Google Patents

Abstract

A DEVICE FOR HIGH-SPEED PHOTO REGISTRATION of fast processes containing a pulsed illumination source, a shutter mounted on the optical axis of the camera, between which there is a working area for the object under study, and a quantum generator, the optical axis of which is perpendicular to the optical axis of the camera ,. as well as a synchronization unit and a control unit, characterized in that, in order to increase the synchronization accuracy and simplify the design by optically matching the start time of the recorded process and its duration, the shutter is made in the form of a film located between the pulsed light source and the work area and optically conjugated with a quantum generator by means of a beam-splitting plate mounted at an angle on its optical axis. z ± /

Description

The invention relates to the study of fast processes using high-speed photographic recording using pulsed light sources to illuminate a recorded object (process).

The aim of the invention is to increase the accuracy of synchronization and simplify the design by optically matching the time of the beginning of the recorded process and its duration.

The drawing shows a diagram of a device for high-speed photographic recording.

The device consists of a solid-state 15 pulsed laser 1, a dividing plate 2, a focusing lens 3, a focusing lens 4, a pulsed light source 5 illuminated by laser radiation 20 of a film 6, an object 7 of the study, a camera of a high-speed photographic recorder (SFR) 8, a remote control 9 control SFR, generator 10 delayed pulses.

The device operates as follows.

The laser pulse 1 focused by lens 3, incident on the object 7 of the study, initiates the process (for example, evaporation, pulsed deformation 30, etc.). In this case, the generation of the laser pulse, ignition of the flash lamp 5 and the opening of the shutter SFR 8 is carried out by one trigger signal from the remote control 9 SFR. 35 Using the generator 10 delayed pulses, you can change the start time of the exposure of the film depending on the nature of the investigated fast process, 40

Part of the radiation of the laser 1 is removed by a glass dividing plate 2, placed along the laser beam between the optical quantum generator and the object of study, 45 and, passing through the focusing lens 4, enters the film 6 lightened by the action of laser radiation, placed between the light source and the object under study. fifty

Film 6, when clarified, opens up access to light from a flash lamp 5 ’to the object 7 of the study. By moving the lens 4, you can change the diameter of the bleached region on the film

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Order 7155/44 Circulation 447. Subscribed

6, thus changing the illumination j of the studied object 7. The shutter in the form of a film 6, which is bleached by laser radiation, acts only on opening, i.e. the recovery time of the optical properties of the material (film) is longer than the duration of the entire process of interaction of laser radiation with the object of study. In this case, the bleaching time of the shielding film 6 is determined by the duration of the laser pulse, which allows this device to study the process of deformation of metal plates 7 of the membrane type.

Since the process of deformation of a metal plate (object of study) in the direction of the action of the laser monopulse does not begin simultaneously with the onset of the action of the laser pulse on it, but only after the time tg = h / C _e , where h is the plate thickness; C & is the speed of sound in the plate material, then when the condition t _n ~ tg is fulfilled, the registration process begins almost simultaneously with the deformation process. In the general case, the difference between C and t _{2 is} eliminated by introducing an optical delay line between the dividing plate 2 and lens 3 (at C ·? T ₂ ) or between the dividing plate 2 and lens 4 (at t ₁ <tt ₂ ). The central part of the plate 7, deforming in the direction of action of the laser pulse, overlaps when the maximum arrow is reached, the access of light from the flash lamp 5 to the exposed film and exposure is completed, i.e. the duration of the backlight pulse corresponds to the duration of the recorded process.

Thus, the proposed device in comparison with the known allows to increase the accuracy of synchronization, which simplifies the photographic recording of processes with a duration of less than 0.1 μs. In addition, the device does not contain special optical-mechanical and electronic elements that require debugging and verification, is easy to assemble and operate.

Branch of the PPP Patent, Uzhgorod, Project 4,

Claims (1)

A DEVICE FOR HIGH-SPEED PHOTO RECORDING of fast-moving processes, containing a pulsed backlight, a shutter mounted on the optical axis of the movie camera, between which there is a working area for the object under study, and a quantum generator, the optical axis of which is perpendicular to the optical axis of the movie camera. I as well as a synchronization unit and a control unit, characterized in that, in order to increase the accuracy of synchronization and simplify the design. by optically matching the time of the beginning of the recorded process and its duration, the shutter is made in the form of a film located between the pulsed backlight and the working area and optically coupled to the quantum generator by means of a beam splitter installed at an angle on its optical axis.