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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing

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All-Fiber Multifunction Continuous-Wave Coherent Laser Radar at 1.55 num for Range, Speed, Vibration, and Wind

C J Karlsson, F A Olsson, D Letalick

|March 20, 2008

Summary

This study presents a versatile 1-watt laser radar system capable of measuring wind speed in clear air and detecting hard targets up to several kilometers away. The system also shows potential for enhanced aerosol wind measurements and vibration sensing.

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Area of Science:

Optics and Photonics
Atmospheric Science
Remote Sensing Technology

Background:

Coherent laser radar systems offer advanced capabilities for atmospheric and target detection.
Developing compact, multifunction laser radar is crucial for diverse environmental and security applications.
1.55-micrometer wavelength systems are advantageous for atmospheric transmission and eye safety.

Purpose of the Study:

To design and evaluate a simple, multifunction 1.55-micrometer laser radar system.
To demonstrate the system's capability for wind-speed measurements in clear air.
To assess the system's performance in range and velocity measurements of hard targets and its potential for vibration sensing.

Main Methods:

Utilized a semiconductor laser source and an erbium-doped fiber amplifier for a 1 W output.
Incorporated a polarization-independent fiber-optic circulator as a transmit-receive switch.
Employed digital signal processing and triangular-wave frequency modulation with laser response compensation.

Main Results:

Successfully performed wind-speed measurements in clear atmospheric conditions with visibility > 40 km.
Achieved range and line-of-sight velocity measurements of hard targets at several kilometers with meter-level range accuracy and 0.1 m/s velocity accuracy.
Demonstrated potential for single-particle detection for enhanced wind measurement sensitivity and vibration sensing.

Conclusions:

The developed laser radar system is a simple yet powerful tool for atmospheric monitoring and target detection.
The system's multifunctionality and performance metrics highlight its suitability for various remote sensing applications.
Further research into single-particle detection could significantly enhance wind measurement sensitivity.