KWOS.it

Centro per lo studio e la sperimentazione di strumentazione meteorologica

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Confronto live dei sensori meteorologici installati presso il KWOS
Poggio Corese: Stazione meteorologica principale - Stazione meteo Ecowitt - Roma: Stazione meteo Meteohelix

Observing equipments

Automated airport weather stations use a variety of sophisticated equipment to observe the weather.

Wind speed and direction

ASOS Ice Free Wind Sensor

A majority of older automated airport weather stations are equipped with a mechanical wind vane and cup system to measure wind speed and direction. This system is simple in design: the wind spins three horizontally turned cups around the base of the wind vane, providing an estimation of the wind's speed, while the vane on top turns so that the face of the vane offers the least resistance to the wind, causing it to point in the direction the wind is coming from and thus providing the wind direction.

The new generation of sensors use sound waves to measure wind speed and direction. The measurement is based on the time it takes for an ultrasonic pulse to travel from one transducer to another, which varies depending on - among other factors - the wind speed. The transit time is measured in both directions for several (usually two or three) pairs of the transducer heads. Based on those results, the sensor computes wind speed and direction. Compared to mechanical sensors, the ultrasonic sensors offer several advantages such as no moving parts, advanced self-diagnostic capabilities and reduced maintenance requirements.
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L'immagine qui a fianco proviene dalla telecamera che monitora i sensori di temperatura del KWOS inseriti in schermi solari di varia tipologia, dai passivi a quelli a ventilazione forzata.

Gli schermi solari ci vengono forniti dalle aziende che desiderano testarli monitorando da remoto, via web, le loro performances.

Grazie al nostro cruscotto dedicato al Confronto sensori è possibile mettere in relazione alla temperatura, la radiazione solare ed il vento. E' possibile generare "on the fly" grafici contour, a istrogramma o a linea con più variabili.

Per consentire un miglior confronto, sono presenti anche i valori registrati dai sensori di radiazione solare e degli anemometri posti a varie altezze.

E' possibile inoltre, scegliere diversi orari della giornata e periodi dell'anno.

Sulla stessa pagina sono rappresentati i dati di più pluviometri, quelli del disdrometro e del rilevatore di nuvolosità del centro KWOS.

I sensori di temperatura sono calibrati ogni sei mesi in cicli termici in camera climatica. Le misure visualizzate tengono conto degli scostamenti registrati durante la calibrazione.

MeteoTracker – the weather station for those on the move

On our Facebook pages, we often show the tests we are carrying out with MeteoTracker: a revolutionary system for measuring, mapping and sharing meteorological parameters on the move.

During a session, the instrument (which is the size of a computer mouse) will measure temperature, humidity and pressure; this data is then sent to an app, which adds GPS coordinates, calculates the altitude and sends all data to the server which also records the route taken by each tracker.

The software is constantly evolving so there will be many more calculated parameters, such as dew point, QNH (reduced to sea level pressure), a radiation index, etc.

It is very easy to use: you only have to download the App the first time you use it and you will have to do Bluetooth pairing to recognise the peripheral device. Once it is switched on, the smartphone will recognise it automatically, it can then be placed in position on your car thanks to its strong magnets and after a few seconds (time enough to fix it in place) you will be ready to go.

Wind speed and direction

ASOS Ice Free Wind Sensor

A majority of older automated airport weather stations are equipped with a mechanical wind vane and cup system to measure wind speed and direction. This system is simple in design: the wind spins three horizontally turned cups around the base of the wind vane, providing an estimation of the wind's speed, while the vane on top turns so that the face of the vane offers the least resistance to the wind, causing it to point in the direction the wind is coming from and thus providing the wind direction.

The new generation of sensors use sound waves to measure wind speed and direction. The measurement is based on the time it takes for an ultrasonic pulse to travel from one transducer to another, which varies depending on - among other factors - the wind speed. The transit time is measured in both directions for several (usually two or three) pairs of the transducer heads. Based on those results, the sensor computes wind speed and direction. Compared to mechanical sensors, the ultrasonic sensors offer several advantages such as no moving parts, advanced self-diagnostic capabilities and reduced maintenance requirements.
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