Dr. Shlomo Fastig Profile

Dr. Shlomo Fastig

Research Scientist

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Publications (10)

Proceedings Article | 19 October 2016 Paper

Instrumental intercomparison investigating vertical profiles of optical turbulence and wind speed in the lower atmospheric boundary layer during frontal passages in northwestern Germany

Detlev Sprung, Karin Stein, Erik Sucher, Abraham Englander, Salomon Fastig, Omar Porat

Proceedings Volume 10002, 1000204 (2016) https://doi.org/10.1117/12.2245483

KEYWORDS: Optical turbulence, LIDAR, Wind measurement, Atmospheric optics, Turbulence, Ultrasonics, Temperature metrology, Aerosols, Earth's atmosphere, Receivers

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Proceedings Article | 20 October 2014 Paper

Instrumental correction of the uneven PMT aging effect on the calibration constant of a water vapor Raman lidar

Valentin Simeonov, Shlomo Fastig, Alexander Haefele, Bertrand Calpini

Proceedings Volume 9246, 92460N (2014) https://doi.org/10.1117/12.2066802

KEYWORDS: LIDAR, Calibration, Raman spectroscopy, Nitrogen, Photomultipliers, Light emitting diodes, Environmental sensing, Mirrors, Light sources, Sensors

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The water vapor profile derived from Raman lidar measurements is obtained by taking the ratio of water vapor and nitrogen Raman-shifted signals. The proportionality factor that converts the signal ratio to water vapor/air mixing ratio is referred to as lidar calibration constant. The calibration constant depends on the water vapor and nitrogen Raman cross sections and on the efficiencies of the respective Raman channels including the photomultiplier tube (PMT) efficiency. Unequal, gradual changes in the PMTs efficiencies due to fatigue effects may lead to gradual alteration of the calibration constant. Such an effect has been observed during the seven- year continuous operation of the RAman Lidar for Moisture Observations (RALMO)¹ . A more detailed research² , has shown that the calibration constant change is more pronounced during summer time probably due to the higher light exposure. Periodical recalibration of the lidar with radiosonde measurements is used to correct the calibration constant. This approach, however, induces additional systematic errors due to the nature of the calibration procedure and the dispersion of the radiosonde parameters. We present a new, instrumental method for automated correction of the calibration constant. By this method, a correction factor is deduced from the ratio of the signals of the two photomultipliers which are illuminated simultaneously by a single, stabilized UV-LED light source. The LED light is delivered to the photomultipliers by a set of additional mirrors and a beam splitter installed inside the grating polychromator used to separate the Raman signals. The correction measurements are taken before midnight. To minimize the data loss, the lidar’s laser is operated during the measurements and a shatter at the polychromator entrance is used to block any atmospheric signals. The use of stabilized light source also allows evaluating the individual photomultipliers aging rates, essential for the instrument maintenance.

Proceedings Article | 29 April 2010 Paper

Standoff detection of explosives in open environment using enhanced photodissociation fluorescence

T. Arusi-Parpar, S. Fastig, J. Shapira, B. Shwartzman, D. Rubin, Y. Ben-Hamo, A. Englander

Proceedings Volume 7684, 76840L (2010) https://doi.org/10.1117/12.850911

KEYWORDS: Explosives, Luminescence, Ultraviolet radiation, Excimer lasers, Optical filters, Telescopes, Explosives detection, Laser induced fluorescence, Receivers, Light scattering

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Proceedings Article | 29 April 2010 Paper

Remote qualitative profiling of the cross-wind flow with lidar

G. Machavariani, J. Shapira, U. Talmud, O. Porat, Sh. Fastig

Proceedings Volume 7684, 76841M (2010) https://doi.org/10.1117/12.850025

KEYWORDS: Sensors, Signal detection, LIDAR, Receivers, Aerosols, Transmitters, Algorithm development, Atmospheric particles, Profiling, Backscatter

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Proceedings Article | 29 April 2010 Paper

Multispectral lidar system: design, build, and test

S. Fastig, Y. Ehrlich, S. Pearl, E. Naor, Y. Kraus, T. Inbar, D. Katz

Proceedings Volume 7684, 76841O (2010) https://doi.org/10.1117/12.851038

KEYWORDS: Ultraviolet radiation, Optical parametric oscillators, Transmitters, LIDAR, Aerosols, Crystals, Infrared telescopes, Mirrors, Sensors, Receivers

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Proceedings Article | 12 September 2003 Paper

Optical parametric oscillator with unstable resonators

Shaul Pearl, Yosi Ehrlich, Shlomo Fastig

Proceedings Volume 4972, (2003) https://doi.org/10.1117/12.478545

KEYWORDS: Resonators, Optical parametric oscillators, Confocal microscopy, Crystals, Mirrors, Diffraction, Wave propagation, Spectroscopy, Laser damage threshold, Nonlinear crystals

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Proceedings Article | 9 January 2002 Paper

Compact high-performance tandem optical parametric oscillator for the 8- to 12-um band

Yosi Ehrlich, Shlomo Fastig, Shaul Pearl, Gidon Cinader

Proceedings Volume 4484, (2002) https://doi.org/10.1117/12.452787

KEYWORDS: Optical parametric oscillators, Crystals, Mirrors, Feedback signals, Ferroelectric materials, Silver selenogallate, Reflectivity, Nd:YAG lasers, Resonators, Remote sensing

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Proceedings Article | 22 September 1997 Paper

Design of low-threshold narrow-linewidth optical parametric oscillators

Idan Paiss, Shlomo Fastig, Raphael Lavi

Proceedings Volume 3110, (1997) https://doi.org/10.1117/12.281408

KEYWORDS: Optical parametric oscillators, Optical filters, Crystals, Laser damage threshold, Reflectors, Ferroelectric materials, Fabry–Perot interferometers, Electronic filtering, Signal attenuation, Dielectric polarization

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Proceedings Article | 3 June 1994 Paper

Remote aerosol mapping in the boundary layer with a Lidar system

Shlomo Fastig, Y. Benayahu, Abraham Englander, E. Glaser

Proceedings Volume 2112, (1994) https://doi.org/10.1117/12.177300

KEYWORDS: Aerosols, LIDAR, Temperature metrology, Meteorology, Atmospheric particles, Atmospheric optics, Image processing, Pollution, Active optics, Image enhancement

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Proceedings Article | 13 August 1993 Paper

Aerosol density distribution in the boundary layer measured by a scanning LIDAR system

Shlomo Fastig, Y. Benayahu, Abraham Englander, E. Glaser

Proceedings Volume 1971, (1993) https://doi.org/10.1117/12.151028

KEYWORDS: Aerosols, LIDAR, Optical engineering, Atmospheric optics, Temperature metrology, Meteorology, Atmospheric particles, Image processing, Visualization, Image enhancement

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Showing 5 of 10 publications

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