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Updated: Jun 20, 2026

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

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Published on: February 13, 2018

Long-range, noncoherent laser Doppler velocimeter.

S H Bloom, R Kremer, P A Searcy

|September 29, 2009

Summary

A new long-range, noncoherent laser Doppler velocimeter (LDV) uses atomic vapors to measure wind speed. This innovative technique shows promising agreement with traditional anemometers for accurate, long-distance wind velocity detection.

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Published on: April 24, 2014

Area of Science:

Physics
Atmospheric Science
Optical Engineering

Background:

Traditional wind speed measurements often face limitations in range and environmental tolerance.
Laser Doppler Velocimetry (LDV) offers a non-contact method for velocity measurement.
Existing noncoherent LDV systems require further development for long-range applications.

Purpose of the Study:

To experimentally demonstrate a novel long-range, noncoherent laser Doppler velocimeter (LDV).
To utilize atomic vapor spectral absorption features for enhanced Doppler shift detection.
To assess the feasibility of this LDV for accurate, remote wind velocity measurements.

Main Methods:

Developed a noncoherent LDV system employing atomic or molecular vapors.
Leveraged the sharp spectral absorption features of vapors to convert frequency shifts to transmission changes.
Conducted preliminary wind velocity measurements using seeded aerosols and compared results with a mechanical anemometer.

Main Results:

Successfully demonstrated the principle of the long-range, noncoherent LDV.
Preliminary wind velocity measurements showed agreement with mechanical anemometer data.
The system's accuracy was limited by the current measurement precision of the LDV itself.

Conclusions:

The experimental setup validates the potential of using atomic vapor absorption features for noncoherent LDV.
This technique offers a promising pathway for accurate, range-resolved, and vibration-tolerant wind-speed measurements.
Further optimization is expected to enhance the LDV's performance for large-distance atmospheric monitoring.