Optical Scientific Inc. (OSi)

- Model LOA-005 - Wind Speed and Air Turbulence Sensor



The Long-baseline Optical Anemometer (LOA) measures path averaged crosswind and turbulence over distances of 100 meters to over 10 km. Based on optical scintillation technology, its optics ‘see’ the always present temperature and density variation in small parcels of air as they move through the infrared beam. For applications where wind field direction is also needed, two systems can be setup in an “X” pattern. By surrounding an area with three or more end-to-end links, even the vertical component can be measured. The LOA provides true remote sensing of cross winds and turbulence in all weather conditions.


OSI’s patented LOA sensors are based on advanced technology tested and approved by the National Oceanic and Atmospheric Administration (NOAA), the Environ-mental Technology Laboratories (ETL) and the Environ-mental Protection Agency (EPA).

Our system design, based on decades of extensive field experience in harsh environments, provides for a rugged and extremely reliable sensor which is immune from the typical error mechanisms. The sensors use AGC circuitry to eliminate the effects of LED output power drop, contaminated optics, or dusty air. Internal diagnostics alert the user if the signal strength is getting too low for normal operation. Preventative maintenance, suggested every 6 months, is as simple as cleaning the optical windows and verifying optical pointing. Because of the DSP based design, no field calibration is ever needed.

  • True path-averaged crosswind and turbulence remote measurement
  • Ultra low wind threshold –– 0.01 m/s
  • Field proven scintillation technology
  • High reliability / Low maintenance
  • DSP based – no field calibration needed
  • Unaffected by dust buildup on lenses
  • Rugged, all-weather design
  • Transmitter can be battery powered
  • Easy permanent or temporary install
  • Continuous self diagnostics & test

  • Environmental: - Emergency response - Plume dispersion - Roof vent flows
  • Airport Safety: - Wake vortex - Runway crosswinds - Downdrafts / micro bursts
  • Weapons Testing: - Artillery trajectory - Laser propagation - Chemical dispersion
  • Micrometeorology: - Convergence / Divergence - Diffusion Studies

Performance Specification:

  • Cn 2 Turbulence Range: 10-16 to 10-12 m-2/3
  • Cn 2 Turbulence Path Length : 0.1 to 3 km
  • Wind Range: 0.01 to 40 m/s
  • Wind Path Length: 0.1 to 10 Km

Electronic Specification:

  • Power Requirements Transmitter: 115 VAC, 50/60 Hz, 12 VA, or +12 VDC
  • Electronic Enclosure: Universal 100-240 VAC, 50/60 Hz, 40 VA, Surge Protected
  • Signal Output: RS-232 ASCII, simple polled protocol
  • Transient Protection: All power & signal cables protected

Environmental Specification:

  • Temperature: -40° to 140° F (-40° to 60° C)
  • Humidity: 0-100%
  • Precipitation / Dust: NEMA 4 type protection

Physical Specification:

  • Transmitter Size: 8.25 x 7.75 x 30 inch (210 x 195 x 760 mm) - H x W x D
  • Transmitter Weight: 18 lbs (8 kg)
  • Receiver Size: 14 x 8.25 x 30 inch (355 x 210 x 760 mm)
  • Receiver Weight: 30 lbs (14 kg)
  • Enclosure Size: 16 x 12 x 10 inch (400 x 300 x 250 mm) - H x W x D
  • Enclosure Weight: 20 lbs (9 kg)
  • Head & Enclosure Cable Length: 15 ft (5 m)

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