{"id":1014061,"date":"2017-03-15T00:00:49","date_gmt":"2017-03-14T23:00:49","guid":{"rendered":"http:\/\/blog.lufft.com\/en\/?p=14061"},"modified":"2017-09-20T08:30:56","modified_gmt":"2017-09-20T06:30:56","slug":"what-are-the-advantages-of-ultrasonic-wind-sensors","status":"publish","type":"post","link":"https:\/\/blog.otthydromet.com\/en\/what-are-the-advantages-of-ultrasonic-wind-sensors\/","title":{"rendered":"What are the Advantages of Ultrasonic Wind Sensors?"},"content":{"rendered":"<p>In the following blog post Helmut Hager, Head of the Calibration Laboratory at Lufft, shows us what distinguishes ultrasonic windsensors from other sensor types.<\/p>\n<p><!--more--><\/p>\n<p>&nbsp;<\/p>\n<p><span id=\"result_box\" class=\"\" lang=\"en\" tabindex=\"-1\">Whether mechanical, ultrasonic or laser wind measurements: All measuring methods have technical limits. While for mechanical wind sensors the measuring element &#8211; cups and vanes &#8211; itself predominantly produces a disturbance in the flow field, for ultrasonic anemometers a disturbance can be caused by the sensor holder or housing construction. Only optical methods, e.g. <span class=\"\">LDA (Laser Doppler Anemometer), enable a disturbance-free measurement of wind speeds.<\/span> <span class=\"\">However, for this particles are required and such devices are very expensive and difficult to maintain.<\/span><\/span><\/p>\n<p><span id=\"result_box\" class=\"\" lang=\"en\" tabindex=\"-1\">When watching mechanical wind sensors such as vane models, you&#8217;ll notice that these always move slightly at all times &#8211; even under constant wind conditions. Cup and vane systems always have a certain inertia, which makes it impossible to capture short wind gusts.<\/span><\/p>\n<p>Compared to this, ultrasonic wind sensors such as the <a href=\"https:\/\/www.lufft.com\/products\/wind-sensors-anemometers-289\/ventus-umb-ultrasonic-wind-sensor-2303\/\" target=\"_blank\">VENTUS-UMB<\/a> have significant advantages. Also, there are no mechanically moving parts which wear out. Lufft VENTUS-UMB issues precise real time measured values every quarter of a second (0.25 s). In case this is too fast, the output rate can be slowed down, of course. Moreover, even under the most extreme conditions, it stays ice-free thanks to built-in heating.<\/p>\n\n<p><span id=\"result_box\" class=\"\" lang=\"en\" tabindex=\"-1\">Disturbances, which can be caused by the sensor fixtures, bars and housing construction, are smoothed by the long distance over which the ultrasonic signal travels; on the other hand, every ultrasonic anemometer from <a href=\"https:\/\/www.lufft.com\/\" target=\"_blank\">Lufft<\/a> undergoes an elaborated adjustment process in the wind tunnel in order to detect and correct all kinds of influences. This allows us to eliminate interfering influences. All test results are recorded in a calibration protocol which is included in the scope of delivery by default.<br \/>\n<\/span><\/p>\n<p><span id=\"result_box\" class=\"\" lang=\"en\" tabindex=\"-1\">With this service Lufft stands out clearly against other ultrasound device manufacturers carrying out only a so-called &#8220;zero runtime check&#8221; or a synthetic adjustment (without wind).<\/span><\/p>\n<p><span id=\"result_box\" class=\"\" lang=\"en\" tabindex=\"-1\"><span title=\"Im oben dargestellten Diagramm sehen Sie die Messungen des Ultraschall-Windsensors eines WS500 Kompaktwettersensors \u00fcber drei Jahre hinweg.\">In the diagram above, you can see the measurements of a <a href=\"http:\/\/lufft.com\/en\/products\/all-in-one-sensors\/ws500-umb-smart-weather-sensor-8373u01\/\" target=\"_blank\">WS500<\/a>\u00a0compact weather sensor&#8217;s ultrasonic wind sensor over three years. <\/span><span title=\"Auf der X-Achse ist die Windgeschwindigkeit aufgetragen, die Y-Achse zeigt die Messabweichungen des Wettersensors.\">The wind speed is plotted on the X axis, while the Y axis shows the measurement deviations of the weather sensor. <\/span><span title=\"Im Diagramm stellen die gepunkteten Linien die Spezifikation dar. Ber\u00fccksichtigen sollten Sie hierbei unbedingt die Messunsicherheit des Windkanals - Streuungen sind hier v\u00f6llig normal.\">In the diagram, the dotted lines represent the specification. Please also take the measurement uncertainty of wind tunnels into account &#8211; scatterings are normal here. <\/span><span title=\"In jedem gemessenen Jahr liegt das Messergebnis weit innerhalb der Spezifikation, was bedeutet, dass das Ger\u00e4t selbst nach drei Jahren immernoch genau so zuverl\u00e4ssig misst wie zu Beginn. \">In each measured year, the result is clearly within the specification, which means that the device still measures as reliably as at the beginning &#8211; even after three years.<\/span><\/span><\/p>\n<p><span class=\"\" title=\"Diese Langzeitstbilit\u00e4t macht sich finanziell bemerkbar: Mechanische Windsensoren sind zwar g\u00fcnstiger in der Anschaffung, m\u00fcssen jedoch wesentlich fr\u00fcher als Ultraschall-Modelle ersetzt werden.\">This long-term stability has a positive effect on operating costs: Mechanical wind sensors are less expensive to acquire but have to be replaced much earlier than ultrasonic models.<\/span> <span class=\"\">With regard to the total costs of ownership, it becomes clear that digital versions generally result in significantly lower costs than mechanical ones.<\/span> <span class=\"\">For this purpose, I recommend to take a closer look at Abraham Aguilar&#8217;s <a href=\"https:\/\/bloglufftprd2.wpengine.com\/en\/mechanical-vs-ultrasonic-wind-sensors-a-cost-benefit-analysis-wind-turbine-control\/#more-12086\" target=\"_blank\">cost-benefit analysis<\/a>.<\/span><\/p>\n<p><span class=\"\" lang=\"en\" tabindex=\"-1\"><span class=\"alt-edited\">Note: In the context of <\/span><\/span><span id=\"result_box\" class=\"\" lang=\"en\" tabindex=\"-1\">traceability <span class=\"alt-edited\">and measurement certainty, you should nevertheless calibrate environmental sensor on a regular base.<\/span><\/span><\/p>\n<p>You have questions about Lufft wind sensors? We&#8217;re happy to help!<\/p>\n<p><a href=\"https:\/\/bloglufftprd2.wpengine.com\/en\/contact\/\"><img decoding=\"async\" class=\"alignnone wp-image-13786\" src=\"https:\/\/blogottprod.wpengine.com\/wp-content\/uploads\/2016\/11\/Contact-Us-Button-4.png\" alt=\"Contact Us Button\" width=\"150\" height=\"34\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the following blog post Helmut Hager, Head of the Calibration Laboratory at Lufft, shows us what distinguishes ultrasonic windsensors from other sensor types.<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,46],"tags":[],"class_list":["post-1014061","post","type-post","status-publish","format-standard","hentry","category-meteorologie","category-meteorology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What are the Advantages of Ultrasonic Wind Sensors? 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