High Speed Photography

Courtney-Pratt, J. S.; Thackeray, D. P. C.

doi:10.1080/00223638.1957.11736592

Cited by 7 publications

(2 citation statements)

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“…The study of dynamic physical phenomena at short time scales is coupled to the development of high-speed photographic techniques capable of recording them [1]. From filmbased high-speed systems such as the drum camera and streak camera [2] to modern digital high-speed cameras [3], the last few decades have seen many orders of magnitude improvement in the rate at which images can be acquired, the resolution of those images, and the number of images that can be continuously recorded. Novel sensor designs have enabled the development of cameras with acquisition speeds on the order of millions of frames per second [4].…”

Section: Introductionmentioning

confidence: 99%

A low-cost high-speed CMOS camera for scientific imaging

Duke¹,

Knast²,

Thethy³

et al. 2019

Meas. Sci. Technol.

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Non-intrusive temporally and spatially resolved measurements of dynamic phenomena are heavily reliant on high-speed (>1 kHz) digital scientific cameras. The cost of these cameras is a major constraint on the operation of many experimental and educational research facilities. In this paper we present a performance analysis of a low-cost high-speed CMOS camera, the Chronos 1.4. Developed for consumer use, we investigate its potential as a scientific camera. It uses a 12 bit Luxima LUX1310 CMOS sensor with 1280 × 1024 px at 6.6 µm pitch and 1 µs minimum global shutter. It is capable of recording at 1057 Hz at full frame and up to 38 kHz with a reduced field of view. It provides a number of features not typically found in low-cost consumer cameras, such as external triggering and shutter gating control, clock outputs, and raw binary data output. We test the linearity of the sensor response using a pulsed LED source and analyse the sensor performance in terms of noise, jitter and intensity lag. A quantitative demonstration of the camera's performance under realistic experimental conditions is demonstrated with an image correlation velocimetry measurement in a high-speed propellant spray. The camera compares favourably against several scientific high speed cameras from major manufacturers. The camera is well suited for high resolution forward-scattering and in-line imaging techniques such as schlieren, shadowgraphy, holography and bright-field microscopy. Spatial bias in the dark field noise floor makes it generally unsuitable for lowlight measurement conditions. However, the small footprint and low cost make it ideal as an educational tool and for multi-camera experiments. These tests were conducted independently of the manufacturer and the authors have no conflicts of interest to disclose.

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Section: Introductionmentioning

confidence: 99%

A low-cost high-speed CMOS camera for scientific imaging

Duke¹,

Knast²,

Thethy³

et al. 2019

Meas. Sci. Technol.

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“…基于各向异性及后加速技术的百飞秒时间分辨条纹管设计 * 田丽萍 1) 3) 沈令斌 1)3) 陈萍 2) 刘玉柱机是实现该目标的唯一高端科学测量与诊断仪器 [1][2][3] . 自 1949 年世界上首台条纹相机问世以来 [4] , 各国科学家相继在提升条纹相机时间分辨率方面作了诸多工作.…”

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100 fs time-resolved streak tube design based on anisotropy and post-acceleration technology

Tian Li-Ping,

陈萍,

Shen Ling-bin

et al. 2023

Acta Phys. Sin.

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Reducing the space charge effect and the time dispersion caused by the edge field effect of the scanning deflection system is the key to realize the 100-femtosecond streak tube. In this paper, a novel femtosecond streak tube is proposed and designed. The factors affecting the temporal resolution are analyzed theoretically and the specifications are given. Parameters including the electric field distribution and electron transmittance on the two common acceleration system structures (planar cathode -mesh accelerating electrode and planar cathode – slit accelerating electrode) are compared and analyzed theoretically. The results show that although the electric field distribution formed by the planar cathode – mesh accelerating electrode could form uniform electric field, the electron transmittance is very low; planar cathode-slit accelerating structure would defocus the photoelectron beam along the scanning direction, but the electron transmittance in the effective detection range of the cathode is as high as 100%. The defocusing of the photoelectron beam can be removed by setting a narrow slit in front of the anode. The focusing electrode adopts two groups of plate-like structures which are vertically placed front and back, forming one-dimensional focusing electric fields along the scanning and the slit direction, respectively. The spatial focusing electrode is placed close to the phosphor screen, which is beneficial to push back the cross-point of the electron beam along the spatial direction. Thus, the electron transit time dispersion in the condition of large electron density would decrease. At the same time, the anode can provide a post-accelerating voltage of +5000 V, which is beneficial to shorten the transit time and dispersion of the photoelectrons, thereby improving the temporal resolution. Based on the above theoretical analysis, a novel femtosecond streak tube is designed by using planar cathode-slit accelerating electrode, anisotropic focusing system and post-accelerating method. The influence of the anode slit width on the spatial and temporal resolution is simulated. The results show that the temporal resolution deteriorates with the increase of the anode slot width (10 μm ~ 50 μm), due to the increase of the anode slit width will lead to the gradual increase of the size of the electron spot along the scanning direction, which would lead to the increase of the technical time dispersion. In addition, this study gives the simulation results of the femtosecond streak tube when the anode slit width is in the range of 10~50 μm. The results show that the static spatial resolution is higher than 100 lp/mm @ MTF=10%, dynamic spatial resolution is higher than 29 lp/mm @ MTF = 10%, the temporal resolution is better than 122 fs in the range of 4 mm cathode effective detection length. When the effective detection length of the cathode is increased to 8 mm, the dynamic spatial resolution of the streak tube tube is higher than 22 lp/mm @ MTF=10%, and the temporal resolution is better than 191 fs.

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Motion Picture Projection of Multiple Spark Camera Film

Kent

1966

Review of Scientific Instruments

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A method is described for motion picture projection of multiple spark camera film records. Motion picture projection of these nonstandard film records can enhance their usefulness by aiding visualization of the photographed event. Such projection can be accomplished by using the objective lens group of the multiple spark camera (or a duplicate lens group) as a projection lens group. The addition of a viewing screen, an illumination source, and an appropriate shuttering device enables the film to be projected as a motion picture sequence.

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High Speed Photography

Cited by 7 publications

References 0 publications

A low-cost high-speed CMOS camera for scientific imaging

A low-cost high-speed CMOS camera for scientific imaging

100 fs time-resolved streak tube design based on anisotropy and post-acceleration technology

Motion Picture Projection of Multiple Spark Camera Film

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