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Vantaa, Finland

For the village in Samoa, see Vaisala Vaisala is a Finnish company that develops, manufactures and markets products and services for environmental and industrial measurement.The major customer groups and markets are national meteorological and hydrological services, aviation authorities, defense forces, road authorities, the weather critical energy sector, life science and high-technology industries and building automation.Vaisala had nearly 1,400 employees and net sales of €273.6 million in 2011. Vaisala serves customers in more than 140 countries; sales outside Finland accounted for 98% of net sales in 2011.The parent company Vaisala Oyj, domicile in Vantaa, Finland, is listed on the NASDAQ OMX Helsinki. Vaisala Group has offices and operations in Finland, the United States, the United Kingdom, Canada, France, Germany, China, India, Sweden, Malaysia, South Korea, Brazil, United Arab Emirates, Japan and Australia. Wikipedia.

Vaisala | Date: 2011-03-22

A method and a radiosonde wherein the radiosonde is launched from a launching station and transmission of the radiosonde is started in order to send measurement data to a receiver. The transmission of the radiosonde is started only after a delay from the launch.

This publication discloses a method for calibrating a CO2 concentration measuring device, in which method gas concentration is measured in a room. In accordance with the invention presence of persons is continuously determined in the room, and the measurement results are corrected based on the presence information.

In one embodiment, a wind power ramp event nowcasting system includes a wind condition analyzer for detecting a wind power ramp signal; a sensor array, situated in an area relative to a wind farm, the sensor array providing data to the wind condition analyzer; a mesoscale numerical model; a neural network pattern recognizer; and a statistical forecast model, wherein the statistical model receives input from the wind condition analyzer, the mesoscale numerical model, and the neural network pattern recognizer; and the statistical forecast model outputs a time and duration for the wind power ramp event (WPRE) for the wind farm.

Pohjola H.,Vaisala | Makela A.,Finnish Meteorological Institute
Atmospheric Research | Year: 2013

The performance of GLD360 (Global Lightning Dataset 360) long range lightning location system has been studied over Europe. The analysis has been done by comparing the lightning location data of GLD360 from year 2011 (May-September) to a reference system, which here is EUCLID (European Cooperation for Lightning Detection); EUCLID is a good reference system because its performance has been analyzed around Europe in many previous studies, especially in Austria. We show results about the relative performance of GLD360 from Austria, Scandinavia, North Sea and Spain, as well as the general relative performance over the whole Europe. Our results indicate that (i) the relative detection efficiency (RDE) of GLD360 varies from about 36% to 170% in the EUCLID coverage area, (ii) GLD360 daily RDE in Austria in July varies from 4.4% to 80.8%, (iii) the median relative location accuracy of GLD360 in Austria in July is 2.8. km, (iv) the diurnal variation in Austria in July shows similar feature for both systems, i.e., largest percentage at 16-17 UTC, (v) the median peak current of negative (positive) strokes for GLD360 is 14. kA (11. kA) and for EUCLID for the same area and period 9. kA (7. kA), (vi) the correlation between EUCLID and GLD360 peak current is r=0.72, and (vii) the boundary of the efficient detection area of EUCLID can be clearly seen when the GLD360 RDE increases above 100%; this coverage boundary is extremely sharp. Our results show that a comparison of this kind reveals many interesting performance issues regarding both the comparative and the reference network, especially the areas where the reference network performs poorly. © 2012 Elsevier B.V. Source

The present publication describes a heat-resistant optical layered structure, a manufacturing method for a layered structure, and the use of a layered structure as a detector, emitter, and reflecting surface. The layered structure comprises a reflecting layer, an optical structure on top of the reflecting layer, and preferably shielding layers for shielding the reflecting layer and the optical structure. According to the invention, the optical structure on top of the reflecting layer comprises at least one partially transparent layer, which is optically fitted at a distance to the reflecting layer.

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