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streak camera

Programmable 9-frame high-speed camera K011

The K011 camera is based on multiframe image-converting tube with two pairs of deflecting plates - for vertical and horizontal deflection. Pulses of square voltage are applied to deflection plates during the process of shooting, which allows to produce nine sequential frame images on the fluorescent screen of the image converter. These frames are captured with integrated CCD camera and transferred to PC.  Rate of shooting can reach ten million frames per second. As a result of this technical solution, camera has small dimensions and weight.

Fiber-optic cable (50-500 meters) can be used to control the camera from PC. Input frame window of the multiframe image-converting tube has dimensions of 8x8 mm. Spatial resolution of the multiframe image-converting tube is 12.5 lines per millimeter.

The exposure time of each frame and the duration of interframe pauses are individually adjustable from 50 ns to 500 μs, which makes it possible to set variable rate of shooting.

The possibility of shooting with variable rate and exposure time is a useful feature. Dynamic range can be increased during shooting by configuring camera to change camera gain (brightness amplification) during shooting.

Camera software has built-in tools for quick measurement of the object speeds on recorded images.

The numerical estimation. If a moving point-like object is projected to the area of the input frame window and exposure time of each frame is 100 ns, blurring of the image of the object will remain within the resolution limit of the camera, and time required for moving the object image on frame window from edge to edge will be 10 μs. This corresponds to the speed of the image of the object on the photocathode surface of 800 m/s. With camera input lens that scales shooting area of 80 x 80 mm onto the input frame window, speeds up to 8000 m/s can be measured, i.e. exceeding the first cosmic velocity. And if the area is increased to 800 x 800 mm, the recorded speed will be 10 times higher.

Below are images of various fast processes obtained with the K011 camera.

 

Fig. 1. Breakthrough of a metal membrane and ejection of a gas jet under the effect of an explosion of a hydrogen-oxygen mixture. Shooting time is 45 μs. The gas flow velocity is 1050 m/s.

 

Fig. 2. Rupture of the metal membrane along the cross-cut under the influence of increasing static gas pressure up to 90 kGs/cm2. Shooting time is 30 μs. Speed of opening the "flaps" is 160 m/s.

 

Fig. 3. Metal ball breaks through the glass plate. Interval of time when the ball touches the glass from the side opposite to the camera is captured. During the shock interaction cracks appeared on the glass plate and propagated in different directions from the point of impact. Speed of the ball is 250 m/s. Speed of crack propagation is several thousand meters per second.