Patent
Solid state pulsed coherent laser radar for short range velocimetry applications
Farzin Amzajerdian,Eli Margalit +1 more
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TLDR
In this paper, a method and apparatus for utilizing a single frequency, self seeding laser pulse signal transmitted to create a target beam to be projected toward an atmospheric target whereby a portion will be reflected back upon itself, and a local oscillator beam constructed to a shape approximating a low level elongated square wave pulse to be heterodyned with the returning target beam.Abstract:
The invention presents a method and apparatus for utilizing a single frequency, self seeding laser pulse signal transmitted to create a target beam to be projected toward an atmospheric target whereby a portion will be reflected back upon itself, and a local oscillator beam constructed to a shape approximating a low level elongated square wave pulse to be heterodyned with the returning target beam. A radio frequency voltage drives an acousto-optic modulator and amplitude modulates the local oscillator beam to form an optical output that is a flat top pulse resembling a square wave function. The local oscillator beam and returning target beam are polarization adjusted to match and are then combined and focused onto detector. The system is effective for use as an aircraft velocimeter.read more
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References
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Patent
Infrared radar system
TL;DR: In this article, an infrared radar system was proposed to provide a succession of transmit pulses having a relatively high intensity spike portion followed by a relatively low intensity quasi-CW portion, and a moving target indicator network is responsive to signals from the detector to provide signals representative of the velocity of objects in the target scene.
Journal ArticleDOI
Atmospheric aerosol backscatter measurements using a tunable coherent CO2 lidar
TL;DR: Measurements of atmospheric aerosol backscatter coefficients, using a coherent CO2 lidar at 9.25- and 10.6-μm wavelengths, indicate a wide range of variability in β both in and above the local boundary layer and certain profiles indicate a significant enhancement in β.
Patent
Clear air turbulence detector
TL;DR: In this article, a system to detect clear air turbulance (C.A.T) is proposed, in which a pulse laser light beam is directed ahead of the flight path of the aircraft and the portion of this light reflected back to the aircraft by atmospheric aerosol is detected and analyzed for doppler shift and thus the velocity and intensity of the turbulence is determined.
Patent
Frequency stabilized Ho:YAG laser
TL;DR: In this article, a method and apparatus is presented whereby control of the frequency of pulses emitted by a resonant ring slave laser is forced to a single frequency defined by a seed laser through the control of path length of the ring laser resonant path.
Patent
Pulsed coherent Doppler laser radar
TL;DR: In this article, a Q-switched laser source develops a laser beam to have a high intensity pulse portion and a substantially lower intensity trailing tail portion, which is used as the local oscillator.