KEYWORDS: Laser systems engineering, Data acquisition, Thermoelectric materials, Laser energy, Time metrology, Power meters, Modulation, Sensors, Signal processing, Multimedia
ADLINK PCI-9114 multifunction data acquisition card, signal amplifier and multiplexer board and power sensor are
used to establish the real-time measurement system of relative laser power. During producing laser, measuring and
showing thermoelectric and photoelectric signal, calculating parameter and drawing the curve of relative power. Parameters of laser output power and energy are concerned with researchers. These parameters are important for
evaluating laser system. In this paper, a real time laser power measure system is established. While laser system is
operating, real time laser power measure system measured the power and energy of laser and plotted the waveform of
relative laser power. The parameters such as pulse width, rise time, fall time, power integration, average power, peak
power and average energy are computed.
In order to detection and position the center of laser spot, the method based sub-pixel technology is set up. Under the conditions of no change on the dimensions of CCD detector, sub-pixel method can improve the position precision up to sub-pixel level. The basic principle of sub-pixel method is to precisely position the target with sub-pixel precision by applying the inner interpolation algorithm with the gray distribution characters of target spot in the pattern. At first, the algorithm of edge detection is used for original image and the precision is pixel level. Then, the algorithms to interpolation and approximation based on the first step are used to extract edge, the precision reaches sub-pixel level. Experiments show the position precision to center of laser spot is about 0.1μm.
While using long wave FPA infrared detector to detect target, there are some faults in the infrared detector such as speckles add to infrared image we shot. The inherent faults of the infrared detector are solved by means based on difference between the two continuous frames. By setting different grades of gray value, the noise such as all speckles and mostly background in the two continuous frames is eliminated. Consequently, The area where the target moved is picked up.
KEYWORDS: Digital signal processing, Image processing, Infrared radiation, Infrared imaging, Signal processing, Video, Infrared detectors, Video processing, Object recognition, Digital image processing
In this article, the system of real-time infrared image process based DSP technology was introduced. The real-time infrared image processing consists of detection, recognition and tracking. Based on DSP hardware platform and the way of temporal image differential with motion compensated, the paper describes the image process card principle, the arithmetic of object detection, DSP C6202 design and technology realize. Finally, we do some experiments outfield to verify the real-time infrared image process system. Infrared image of airplane be provided in tracking experiment.
Based upon the static performance of thermal imaging system, the visual range prediction adapted for the extended source target and the spot target is studied. Two kinds of mathematical model and the equation of operating range are set up for the extended source target and the spot target. Meantime, the paper gives computer simulation results and presents a method of the visual range prediction of thermal imaging system to verify whether the thermal imaging system satisfied the technical requirement of the operating-range. Finally, in this paper, the visual range prediction and the test results are compared.
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