Edge technique: theory and application to the lidar measurement of atmospheric wind.

The edge technique is a new and powerful method for measuring small frequency shifts. With the edge technique a laser is located on the steep slope of a high-resolution spectral filter, which produces large changes in transmission for small frequency shifts. A differential technique renders the frequency shift measurement insensitive to both laser and filter frequency jitter and drift. The measurement is shown to be insensitive to the laser width and shape for widths that are less than the half-width of the edge filter. The theory of the measurement is given with application to the lidar measurement of wind. The edge technique can be used to measure wind with a lidar by using either the aerosol or molecular backscattered signal. Examples of both measurements are presented. Simulations for a ground-based lidar at 1.06 microm using reasonable instrumental parameters are used to show an accuracy for the vector components of the wind that is better than 0.5 m/s from the ground to an altitude of 20 km for a 100-m vertical resolution and a 100-shot average. For a 20-m vertical resolution and a 10-shot average, simulations show an accuracy of better than 0.2 m/s in the first 2 km and better than 0.5 m/s to 5 km.

[1]  G. Kattawar,et al.  Rayleigh-scattering line profiles. , 1983, Applied optics.

[2]  R. Cupp,et al.  Optimizing a pulsed Doppler lidar. , 1990, Applied optics.

[3]  G. Hernandez,et al.  Analytical description of a Fabry-Perot photoelectric spectrometer. , 1966, Applied optics.

[4]  Robert L. Byer,et al.  Coherent laser radar at 1,06 μm using Nd:YAG lasers , 1987 .

[5]  Emil Wolf,et al.  Principles of Optics: Contents , 1999 .

[6]  A. D'Amico,et al.  Detection of optical and infrared radiation , 1980 .

[7]  S. Henderson,et al.  Remote wind profiling with a solid-state Nd:YAG coherent lidar system. , 1989, Optics letters.

[8]  R. Menzies,et al.  Doppler lidar atmospheric wind sensors: a comparative performance evaluation for global measurement applications from earth orbit. , 1986, Applied optics.

[9]  J. F. Shanley,et al.  The Laser Atmospheric Wind Sounder-Preliminary Design , 1989, Photonics West - Lasers and Applications in Science and Engineering.

[10]  J. Porteneuve,et al.  A Doppler lidar for measuring winds in the middle atmosphere , 1989 .

[11]  B. Gentry,et al.  New Doppler lidar methods for atmospheric wind measurements: the edge technique , 1990 .

[12]  I. Stuart McDermid,et al.  Ultraviolet-excimer laser-based incoherent Doppler lidar system , 1985 .

[13]  R. M. Hardesty,et al.  Coherent Doppler lidar for measurements of wind fields , 1989, Proc. IEEE.

[14]  V J Abreu.  Wind measurements from an orbital platform using a lidar system with incoherent detection: an analysis. , 1979, Applied optics.

[15]  L. J. Cox.  Optical Properties of the Atmosphere , 1979 .

[16]  James W. Bilbro,et al.  Airborne Doppler Lidar Wind Field Measurements , 1984, Topical Meeting on Optical Remote Sensing of the Atmosphere.

[17]  J. Goodman.  Statistical Properties of Laser Speckle Patterns , 1963 .

[18]  M. Halem,et al.  Observing system simulation experiments related to space-borne Lidar wind profiling. Part 1: Forecast impacts of highly idealized observing systems , 1984 .

[19]  C. Korb,et al.  Airborne and ground based lidar measurements of the atmospheric pressure profile. , 1989, Applied optics.

[20]  R. Byer,et al.  Potential for coherent Doppler wind velocity lidar using neodymium lasers. , 1984, Applied optics.

[21]  Robert Atlas,et al.  Impact Of Satellite Temperature Sounding And Wind Data On Numerical Weather Prediction , 1985 .

[22]  T R Lawrence,et al.  Wind measurement accuracy of the NOAA pulsed infrared Doppler lidar. , 1984, Applied optics.

[23]  E. Eloranta,et al.  High spectral resolution lidar to measure optical scattering properties of atmospheric aerosols. 2: calibration and data analysis. , 1983, Applied optics.

[24]  P. Jacquinot.  The luminosity of spectrometers with prisms, gratings, or Fabry-Perot etalons (Journal of the Optical Society of America 1954) , 1954 .

[25]  S. Henderson,et al.  Eye-safe coherent laser radar system at 2.1 microm using Tm,Ho:YAG lasers. , 1991, Optics letters.

[26]  E. Eloranta,et al.  High spectral resolution lidar to measure optical scattering properties of atmospheric aerosols. 1: theory and instrumentation. , 1983, Applied optics.