![]() ![]() Image used courtesy of Encyclopaedia BrittanicaĪnother popular type of wind sensor is a drag anemometer, which measures wind speed based on deformations caused by airflow in active materials such as piezoelectric sheets. The heating element needs to be constantly heated, resulting in high energy consumption.ĭiagram of a revolving cup electronic anemometer. Here, the temperature gradient is measured by a thermistor using a bridge circuit. Hot-wire anemometers are small and highly accurate. However, the size, slow response time, and high aerodynamic drag of mechanical anemometers make them unsuitable for aerial applications. ![]() Each time the magnet passes a magneto-sensitive switch, it provides a reading of the wind speed. It contains a wheel with cups or propellers at the end of the spokes of the wheel, and one of them has a magnet attached. The most common anemometer is a mechanical anemometer. Many of the current wind sensors are expensive, consume high energy, or have a high atmospheric drag, making them ill-suited for small aircraft. What design challenges of existing anemometers were the researchers up against? To improve the safety of autonomous aircraft, researchers at Ohio State University have recently developed an airfoil-shaped anemometer that is lightweight, low-power, and more sensitive to changes in pressure. However, these tubes require electric heaters to prevent fluid from freezing, which degrades the efficiency of small and micro-aerial vehicles. The stagnation pressure, along with the other parameters, is used to determine the fluid flow velocity or airspeed. These tubes contain moving fluid that is brought to rest. Image (modified) used courtesy of NASAĬurrently, aerial vehicles use pitot tubes to measure airspeed. ![]() They also forecast and optimize the performance of wind turbines.Īn autonomous aircraft in the National Airspace System. Wind sensors are essential to optimize the trajectory of aircraft and smaller aerial vehicles. Within this market, wind sensors (or "anemometers") are critical for monitoring wind speed and direction during take-offs and landings. 3 cups of conical cross-section, 51 mm (2") dia.The demand for autonomous air vehicles is on the rise-with some forecasts predicting a leap in market value from $4.56 billion in 2019 to $16.23 billion by 2027.Onto a 25 mm (1") diameter mast with 2 set screws Refer to individual calibration sheet for information on calibration uncertainty.Ĭontact NRG Sales for Ed. All NRG S1 anemometers are calibrated per IEC 6, Annex F.Įach anemometer individually calibrated at SOH WE, Williston, VT USA.Ĭalibration reports provided via electronic download.Įach anemometer individually calibrated at DWG, Varel, DE.Refer to individual calibration report for anemometer transfer function.Refer to R^2 value on individual calibration report. The NRG S1 Anemomer has also been tested extensively to confirm IEC and CE compliance, as well as IP55 ingress protection, the highest IP standard achievable for cup anemometers.Ġ.638 m/s to 75 m/s (1.427 mph to 167.8 mph)Īmplitude: Equal to supply voltage, max. NRG conducted lightning surge testing which showed that the S1 Anemometer’s resistance to damage from surges in electrical current is superior to the other tested class 1 anemometers commonly used in the wind energy industry. If you are interested in reviewing their technical note or performing your own analysis of the underlying field test data, please click on the following link: More than 60 NRG S1 Anemometers have been field-tested for over a year across a variety of real-world sites. DNV has performed independent verification of the S1 field test. View NRG S1 classification report for IEC 6 Edition 2.0 (SOH Wind Engineering LLC) Robustness View NRG S1 classification report for IEC 6 Edition 1.0 (SOH Wind Engineering LLC) The NRG S1 Anemometer is the only wind energy anemometer classified to both editions of the IEC 6 standard, enabling straightforward comparisons against both new and legacy anemometers. A proven bearing system and a rugged, metal body design ensure the sensor will operate reliably for many years, in a variety of environmental conditions. The NRG S1 Anemometer provides a unique balance of high accuracy and low cost, making it ideal for reducing measurement uncertainty in wind resource assessment campaigns as well as power performance tests. ![]()
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