Long range anemometry using a CO2 laser

Hughes, Alex J.; O'Shaughnessy, J.; Pike, E. R.; McPherson, A.; Spavins, C.; Clifton, T.

doi:10.1007/bf01414142

Cited by 18 publications

(3 citation statements)

References 7 publications

(5 reference statements)

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“…This arrangement was employed in the pioneer work of Yeh & Cummins (1964) and has subsequently been used by many authors. Goldstein & Hagen (1967), Welch & Tomme (1967) and Pike, Jackson, Bourke & Page (1968) applied it to turbulent water flow and Huffaker, Fuller & Lawrence (1969) and Lewis, Foreman, Watson & Thornton (1968) to turbulent air flow. More recently, it has been applied to a wider range of flow configurations, and among these may be cited the laminar, oscillatory water flow measurements of Denison & Stevenson (1970), the blood-flow investigations of Goldstein & Kreid (1971), the passage of a shock wave through water studied by Anderson, Edlund & Vanzant (1971) and the supersonic-flow investigations of Jackson & Paul (1971).…”

Section: Optical Arrangementsmentioning

confidence: 99%

Laser anemometry: a report on EUROMECH 36

1972

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Section: Optical Arrangementsmentioning

confidence: 99%

Laser anemometry: a report on EUROMECH 36

1972

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“…Doppler WPR is vulnerable to the interference of precipitation intensity (Ralph et al, 1995;Lambert and Taylor, 1998). By contrast, Doppler wind lidar (DWL) is characterized by high spatial-temporal resolution, strong anti-jamming capability and good mobility, which negates the traditional observation height limits (Hughes et al, 1972).…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Impact Factors of Doppler Wind Lidar during Super Typhoon Lekima (2019)

Wang

Tang

Guo

et al. 2021

Preprint

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Abstract. Doppler wind lidar (DWL) has been shown to obtain fairly accurate wind speeds in normal wind conditions. However, the evaluation of DWL winds under typhoon conditions is less common. This study evaluated the accuracy of wind data measured by two types of DWLs (WindPrint S4000 and WindCube V2), and investigated the impact of factors (e.g., precipitation and humidity) on the DWL-observed wind speed and direction. Data were collected from joint observations in Baoshan, Zhoushan and Taizhou (China) by the Shanghai Typhoon Institute during the passage of Super Typhoon Lekima in 2019. The DWL observations were compared with measured data from balloon-borne radiosonde released at the same location. The results showed that the 1-min average wind speed and direction of WindPrint S4000 were more consistent with the instantaneous observation data of the sounding balloon than those of WindCube V2. The applicability of DWL was poor when the precipitation intensity was larger than 50 mm · h−1. The DWL wind speed bias significantly increased when the relative humidity exceeded 85 %. When the drift distance of the sounding balloon (ldrift) was less than 1 km, the DWL wind speed bias decreased with an increase of ldrift, whereas it increased with an increase of ldrift when the drift exceeded 1.5 km. Within a radius of 700 km, the root mean square of wind speeds between DWL and sounding balloon measurements showed a trend of increasing as the distance from the typhoon center decreased.

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“…'The measurement offlow with lasers has two particular advantages-laser beams scarcely perturb the flow under investigation, and they can be aimed into regions where it would be difficult or impossible to place a mechanical device. For long ranges and outdoors, CO2 lasers operating at 10.6 pm are most suitable (Lawrence et a1 1972, Hughes et al 1972. The radiation is eye safe, which is particularly important outside the laboratory environment, and analysis shows some signal processing advantages for working in the infrared (Hughes and Pike 1973).…”

Section: Introductionmentioning

confidence: 99%