
APPLICATION
The camera is intended for recording of images and measuring of spatial-temporal parameters of high-speed processes in the visible and near infrared spectral range in a single-frame mode and single-streak mode of sweeping the image under study. The image at the camera output is recorded with the aid of a CCD readout unit and is entered into a personal computer. A software provides the used with wide possibilities of processing the image recorded.
Possible fields of application:
- ballistic investigation,
- investigations of combustion processes, detonation, explosion, as well as scattering of ground and fields of fragments and other particles,
- shock waves physics,
- laser physics,
- nonlinear optics,
- nuclear physics,
- plasma physics including thermonuclear synthesis and so on,
- electric breakdowns and discharges including lightning,
- ecology (a register in LIDAR systems of detecting, determination of location and chemical composition of air or water pollution) etc.
CONSTRUCTION AND OPERATING PRINCIPLE
An electron tube is equipped with a semitransparent multialkali photocathode and micro-channel plate.
The main components of the streak & uniframe camera are:
- an input optic system,
- PV-201 electron tube containing one pair of deflection plates and one micro-channel plate,
- a power supply unit,
- two changeable control units sweep and gate pulse generators,
- a CCD readout unit.
These components are assembled within the metal mini case and can be updated.
Streak mode
The optic system forms a slit image of the phenomenon to be analyzed and transfers it onto the photocathode of the tube. The deflection plates of the tube sweeps a photoelectron image over the micro-channel plate, creating a linear time base perpendicular to the spatial axis. The photoelectron pattern is intensified by the micro- channel plate and is proximity transfered onto the screen. The visible image is readout from the screen by CCD TV camera wich is coupled to the computer.
Frame mode
The deflection plates is not used in the frame mode. The optic system transfers two-dimensional image of the phenomenon to be analyzed onto the photocathode of the tube. A photoelectron image is focused onto the locked micro-channel plate. At some moment the gate pulse unlocks it. The photoelectron image is intensified by the micro-channel plate and then it is transfered to the screen. The frame image is read-out from the screen by CCD TV camera (1392x1032 pixels, 12 bits ACD).
| Spectral sensitivity range | typ | 400-800 | nm | |
| Sweep time | min max |
2.0 0.6 |
ns/full screen ms/full screen | |
| Temporal resolution in streak mode ( λ = 800 nm ) |
typ |
20 | ps | |
| Frame duration | min max |
10 0.6 |
ns ms | |
| Sweep nonlinearity | max | 3 | % | |
| Delay time ( fastest range ): slow control unit fast control unit |
max max |
220 35 |
ns ns | |
| Repetition rate of control units | max | 10 | Hz | |
| Conversion coefficient ( λ = 480 nm ) | typ | 5000 | W/W | |
| Useful input area: slit length ( streak mode ) frame size ( frame mode ) |
max max |
20 20x15 |
mm | |
| Dynamic spatial resolution : slow control unit fast control unit |
typ min |
20 10 |
l.p./mm l.p./mm | |
| Dimensions: length x width x height | - | 400x90x180 | mm | |
| Weight | max | 3.6 | kg | |
| Power consumption | typ | 8.5 | VA | |
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