Laser fuze is a kind of proximity fuze developed with laser technology. A encountering simulation system for laser fuze
based on environment simulator and fiber retarder is introduced in this paper. The system can simulate the process for
the laser fuze to approach the target quickly, with consideration of changing light path and intensity caused by factors
like environment and distance. It can be a reference for the future design of laser fuze.
Compared with other imaging approaches, high resolution angle-angle-range imagery provided by the three dimensional
imaging laser radar increases probability of target identification. Based on scannerless pulsed time-of-flight method, this
paper presents breadboard laser radar for proof-of-principle. A laser transmitter using laser diode flood illuminates a
target area with a relatively short pulse, then a receiver collects the returned energy on a 4x4 PIN diode array where each
pixel measures range respectively. Each of 16 channels consists of a TIA, main amplifier, timing discriminator and a
TDC channel. A processor based on microcontroller processes the output result of all pixels from two TDCs, then
transfers final range data to laptop for visualization. Here we present some preliminary intensity images of target
acquired through indoor experiments. Through these results, the feasibility of direct-detection imaging laser radar for
short-range target identification has been proved. Meanwhile, further development of this system is discussed.
A model of photodetector was established, and the expression of the interference to the photodetector caused by sunlight
directly propagating into the detector was given. With integrals over area elements, the filling of the view field of the
photodetector by the ground was discussed in detail. The expression of the interference to the photodetector caused by
sunlight scattered by the ground was deduced. The research presented in this paper is a contribution to the application of
photodetectors.
KEYWORDS: Digital signal processing, Laser processing, Laser systems engineering, Semiconductor lasers, Data acquisition, Target detection, Pulsed laser operation, Laser applications, Field programmable gate arrays, Signal processing
Because means of target detection is simple, laser short-range detection system using analog processing has high False-
Alarm Rate. The requirement of target detection under complicated background can not be satisfied. Based on DSP and
FPGA, this paper presents a mini laser short-range detection system using real-time digital processing. The modularized
idea is applied to design the system. Every function module is designed respectively. The prototype is finally constituted,
which provides algorithm of target identification and acquisition of echo data with hardware platform. The requirement
of future application under strong clutter is satisfied.
Laser ranging is to measure the distance of a target with laser beam. Having the advantages of narrow beam and strong resistance to electromagnetic interference, it has been developed and researched by many countries. Because of the complexity of backgrounds and targets, it is necessary to research the related laser echo characteristics. The power, waveform and other identities of laser pulse echo from targets are analyzed based on the experimental results of the laser ranging system. Valuable conclusions were drawn for the laser echo characteristics for different materials.
Laser diodes are widely used in many fields, but the poor beam quality is an obvious deficiency. The intensity
distribution of a beam from a laser diode in the slow axis is so complex that it is difficult to be described by a Gaussian
distribution of a certain order. The beam qualities of a certain type of laser diode in the directions of perpendicular and
parallel to junction are evaluated in this paper. The intensity distributions in two directions are described respectively by
fundamental mode Gaussian distribution and multi-mode Hermite-Gaussian distribution. The computed data is basically
in accord with the experimental data. The mathematical model may provide some suggestions for the designing of optical
system with laser diodes and related simulations.
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