A gateable, image-intensified laser system that permits detection of latent fingerprints under high background light is described. The system is intended for crime-scene work and for daylight conditions.
The generation of lump solitons by a three-dimensional bottom topography is numerically investigated by use of a forced Kadomtsev-Petviashvili-I (KP-I) equation. The numerical method is based on the third order Runge-Kutta method and the Crank-Nicolson scheme. The main result is the pairwise periodic generation of two pairs of lump-type solitons downstream of the obstacle. The pair with the smaller amplitude is generated with a longer period and moves in a larger angle with respect to the positive x-axis than the one with the larger amplitude. Furthermore, the effects of the detuning parameter on the generation and evolution of lumps are studied. Finally the waves propagating upstream of the obstacle are also briefly investigated.
In camera industry to find the focal plane of the camera lens is important for quality control. Several opto-electric focusing techniques have been investgated. An opto-electric instrument which can be used in assembly line is presented. The measurement system includes modulated light source, optical system with displacement sensor, plane mirror, sensing device, signal processing system, interface, microcomputer system. A SPICE program is used for design the signal processing system. The opto-electric focusing system can be used for finding the focal plane of the fixed length camera lens and the zoom. The dynamic measurement is avilable.The drift of image plane also can be measured when the object distance from infincitive to 0. 6 meter. The optoelectric focusing system is being used in the Shanghai Camera factory at the assembly line.
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