After giving the detection principle and geometric model of airborne scanning lidar briefly, this paper analyzed the
existent error sources in detection process, and established the correction equation of position error. The simplified
models of the attitude changes and aircraft oscillation in frequency are developed. Based on computer simulation of their
simplified models, the outcome of simulation is analyzed. Finally a few elementary conclusions are obtained and some
suggestions are offered for improving detection accuracy and for error compensation of airborne scanning lidar data. The
results are of reference value in research on the improvement of detection accuracy of airborne scanning lidar.
A new method of remote sensor of micro amount oil in water by laser induced fluorescence is presented. In the detecting system, a MODEL YAG571C pulsed triplicated laser (Continuum Corporation of U.S.A.) With wavelength of 355nm, pulse duration of 35ps, pulse energy of 3mJ was used as exciting source. Using multi-track spectrograph as the detector, a computer as the data processor, 355nm laser as the master trigger which contact the SRS-DG535 four channel digital delay/pulse generator, we have obtained fluorescence lifetime of some aromatic pollution materials in water and relevant 3D (time-wavelength-fluorescence intensity) fluorescent diagrams. By analyzing the spectra property, it is possible to discriminate the oil pollution types.
A laboratory unit is described that was designed to detect and identify the oil pollutants in the environment by means of the laser-induced fluorescence spectrum analyzer. UV laser beam from third harmonics of the Nd:YAG laser is used to excite target oil. The multichannel detection system consists of a spectrometer, a scientific-grade gated ICCD camera and a digital delay generator. A personal computer is responsible for the control for the whole system as well as for the data processing. In the experiment, the laser beam is directed toward the samples while the return fluorescence signals is collected by a Cassegrainian reflecting telescope. The received signals pass through a bunch of fibers, and go into the input slit of the spectrometer. The fiber bunch includes 19 fibers, one end of which take shape of disc to collect the signals from the telescope while the other arrange in a row to match the spectrometer slit. As the results, the fluorescence emitting spectrum of sample oil under the illumination of laser beam wavelength of 355nm is in the range 400nm to 700nm and center around 520nm. The laser and the receive system are both at a distance 25m from the target since the restriction of the working place. The system has the detection capacity for more distance.
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