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Vaisala Oyj
TypeJulkinen osakeyhtiö
Nasdaq HelsinkiVAIAS
Founded1936; 85 years ago (1936)
Vantaa, Finland (as Mittari)
FounderVilho Väisälä
HeadquartersVantaa, Finland
Area served
150+ countries
Key people
Kai Öistämö, CEO
Productsenvironmental and industrial measurement products and services
RevenueDecrease €379.5 million (2020)[1]
Increase €44.8 million (2020)[1]
Decrease €32.8 million (2020)[1]
Total assetsDecrease €351.8 million (2020)[1]
Total equityIncrease €205.5 million (2020)[1]
Number of employees
over 1,900 (12.12.2020)[2]
SubsidiariesVeriteq Instruments Inc.,[3] Sigmet Corp.,[4] 3TIER Inc.,[5] Second Wind Systems Inc.,[6] Vionice,[7] Leophere SAS,[8] K-Patents[9]

Vaisala Oyj (Finnish pronunciation: [ˈʋæi̯sælæ]) 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 over 1,900 employees[10] and net sales of €379.5 million in 2020. Vaisala serves customers in more than 150 countries.[11]

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, Australia, Brazil, Canada, China, France, Germany, India, Italy, Japan,[12] Kenya, Malaysia, México, South Korea, Sweden, United Arab Emirates, and the United Kingdom.


A GPS sonde (RS92), approx 220 × 80 × 75 mm (8.7 × 3.1 × 3 in)

Vaisala's origins date back to the 1930s when Professor Vilho Väisälä (1889–1969), Vaisala's founder and long-time managing director, invented some of the operating principles of a radiosonde[citation needed]. He sent the first Finnish radiosonde aloft in December 1931. After the first sounding, Väisälä continued with further development and tests until a radiosonde could be brought into production and deliveries started in 1936. From the very start, Vaisala was an international business, exporting 95 percent of the production. As the Vaisala radiosonde became internationally renowned, the demand for them increased. In 1944, Prof. Väisälä established a company called Mittari Oy ("Gauge Incorporated") and set up manufacturing facilities for radiosonde systems. The first sounding system included a semi-automatic radiosonde receiver, a calibration device and a ground check set. The company employed 13 people at the time. Later, in 1955, the name of Mittari was changed to Vaisala.

From a modest start, the company evolved to become a world leader in many measurement fields and to establish a noteworthy Finnish export industry. At the end of 1954 a modern manufacturing plant was relocated in Vantaa. Since then, the headquarters have been expanded several times and Vaisala's product range has been diversified and expanded greatly. Nowadays Vaisala employs over 1,800 people and serves customers in over 150 countries.[13]

Commercial production since 1936[edit]

After the first sounding, Väisälä continued with further development and tests until a radiosonde could be brought into commercial production. Radiosonde deliveries started with the RS11 (1936–). Amongst its first customers was the Massachusetts Institute of Technology. In 1937, Väisälä's radiosonde won a gold medal at the World Fair in Paris.

Recovering from the wars[edit]

World War II, the Finnish Winter War 1939–1940 and the Finnish Continuation War 1941–1944, disrupted many lives and upset business and delivery activities internationally. The post-war decades witnessed a strenuous effort to revive the national and international economies. Vaisala grew to employ 60 people in 1954. The first issue of Vaisala News magazine was published in 1959. Thanks to major product development efforts, during the 1950s and 1960s the Vaisala Sounding System became completely electronic, the first automatic radiosonde receiver and the world's first fully transistorized radiosonde RS13 (1965–) were introduced, and the first weather satellite image receiver was delivered. Yrjö Toivola took over as the Managing Director of the company when Professor Vilho Väisälä died in 1969.

Vigorous 70s and& 80s[edit]

The 1970s and 1980s were busy decades for Vaisala. Thin-film technology was developed for Vaisala HUMICAP® relative humidity sensors - the first in the world.[citation needed] The Vaisala CORA Automatic Sounding System - along with automatic weather stations, road weather stations and aviation weather systems - was introduced. In 1975, Vaisala employed over 200 people. During the 1980s, numerous new offices were established to ensure the company's ability to serve customers worldwide - in the UK, Japan, USA, Germany, and Australia. A traffic weather company was also acquired in the UK. Vaisala's first cleanroom was built to enable the design and manufacture of semiconductors in-house. Vaisala BAROCAP® barometric pressure sensor technology was introduced, as well as a new radiosonde family - the Vaisala Radiosonde RS80 (1981–2008). These units made use of a water activated wet battery that had a very long storage life and high power density but a limited working life. The Professor Vilho Väisälä Award was established in cooperation with the WMO, to stimulate interest in meteorological research involving meteorological observation methods and instruments.

The radiosondes have also been used in many upper air ozone research studies using an attached detector that had the sensor data multiplexed with the standard meteorology dataset. GPS positioning information was added to gain more accurate wind speed information.

New millennium[edit]

CEO Pekka Ketonen was appointed in 1992. The company was listed on the Helsinki Exchanges in 1994. By then, it employed over 600 people. Further product developments included the introduction of GPS technology for upper air wind measurement, the Vaisala CARBOCAP CO2 sensor, and Vaisala DRYCAP sensor technology for industrial dewpoint measurement. New offices were established in France and China, and business acquisitions in aviation weather and surface weather further enhanced Vaisala's presence in the USA.

Vaisala RS92-SGPD (left) and its successor, the RS41-SGP (right).

The new millennium was kicked off with yet more business acquisitions - in wind profiling, lightning detection and aviation weather. U.S. manufacturing operations were concentrated in Boulder, Colorado. New product launches included a new radiosonde product family - the Vaisala Radiosonde RS92 (2003 - in production), as well as the Vaisala Weather Transmitter, which measures the six most essential weather parameters in one compact instrument. This was much improved from the previous generation device and now included consumer cells[14] to make up the battery due to energy saving techniques.

CEO Ketonen retired October 1, 2006. Vaisala's board of directors appointed Kjell Forsén the new company CEO. Forsén last served as president of Ericsson Finland before joining Vaisala on September 18, 2006.

Vaisala technology has played a part in space exploration for some 60 years, for instance the Mars Rover Curiosity and Schiaparelli EDM lander contain pressure and humidity sensors manufactured by Vaisala.[15][16]

With new developments in miniaturization, communications and sensors a new radiosonde the model RS41 (2014 - in production) was announced. This model had again made improvements in specifications.[17] Launch preparation made simple with the RI41 ground check device. It is smaller and has pre-flight dry-point humidity sensor calibration achieved by heating the sensor to drive off contaminants. It is also available in a model (RS41-SG) without a pressure sensor, the pressure reading is derived from the GPS altitude, temperature and humidity readings.

History of acquisitions and divestments[edit]

GPS radiosonde (RS92) in ground check set (GC25), used to perform a 'ground check' and also recondition the humidity sensor

The Vaisala Group strives for global market and product leadership in selected business areas[18] The goal is achieved mainly by organic growth and supplemented by corporate acquisitions.


  • 1987: the Group acquired Tycho Technologies Inc. of USA, manufacturer of upper air windprofiler.[citation needed]
  • August 1989: the Group acquired the British Thermal Mapping International Ltd. of United Kingdom. Thermal Mapping specialized in measuring the thermal characteristics of roads and runways and in providing forecast models.


  • June 1995: the Group sold Vaisala Technologies Inc. to Breed Technologies Inc. of USA. Vaisala Technologies Inc. (VTI) manufactured silicon capacitive sensors for the car industry.
  • July 1996: the Group acquired Artais Weather Check Inc. of USA.
  • March 1999: the Group acquired AIR Inc. of USA.
  • October 1999: the Group acquired Handar Inc. of USA.


  • February 2000: the Group acquired Dimension SA of France.
  • October 2000: the Group acquired Jenoptik Impulsphysik GmbH of Germany.
  • June 2001: the Group acquired the Meteorological Systems Unit of Radian International LLC of USA.
  • March 2002: the Group acquired Global Atmospherics Inc. of Tucson, Arizona, USA.
  • July 2005: the Group acquired CLH Inc. of Minneapolis, Minnesota, USA.
  • January 2006: the Group acquired Sigmet Corporation of Westford, Massachusetts, USA.
  • January 2009: the Group acquired Aviation System Maintenance Inc. (ASMI), Kansas, USA.
  • December 2009: the Group acquired Quixote Transportation Technologies (QTT), a subsidiary to Quixote Corporation.


  • March 2010: the Group acquired Veriteq Instruments Inc of Vancouver, BC, Canada
  • August 2013: the Group acquired remote sensing manufacturer Second Wind Systems Inc. of Somerville, Massachusetts.[19]
  • December 2013: the Group acquired 3TIER, Inc., a renewable energy assessment and forecasting services company, headquartered in Seattle, Washington.[20]
  • October 2017: Vaisala acquired Vionice, a Finnish IT company specialized in computer vision and artificial intelligence.[7]
  • October 2018: Vaisala acquired all the shares in Leosphere SAS, a French company specializing in developing, manufacturing and servicing turnkey wind lidar instruments for wind energy, aviation, meteorology, and air quality.[21][22]
  • December 2018: Vaisala acquired Finnish K-Patents, a pioneer in in-line liquid measurements for industrial applications.[9]
  • August 2019: Vaisala announced acquisition of Professional Business-to-Business Weather Services from Foreca.[23]

Vaisala business areas[edit]

Vaisala's business has been divided into two business areas: Weather and Environment and Industrial Measurements.

An earlier design radiosonde (RS80)

Weather and Environment[edit]

The Weather and Environment Business Area is divided into five business segments: Meteorology, Ground Transportation, Aviation, Renewable Energy, and Ambient Air Quality. The customers include meteorological institutes, airports and airlines, road and railroad authorities, renewable energy customers, maritime market segments, as well as defense forces.[24]

Industrial Measurements[edit]

Industrial Measurements customers include multiple industries, including pharmaceutical, biotechnical, medical device and drug distribution companies, as well as the power generation and transmission, maritime, automotive, semiconductor, electronics and building automation industries.[25]

Products and services[edit]

Measurement Instruments[edit]

  • Humidity and temperature measurement instruments
  • Dewpoint measurement instruments
  • Barometric pressure measurement instruments
  • Carbon dioxide measurement instruments
  • Moisture in oil measurement instruments
  • Oxygen measurement instruments
  • Wind measurement instruments
  • Weather multi-sensor
  • Optical weather instruments

Measurement Systems[edit]

Vaisala Marwin Rawinsonde Set MW 12
  • Radiosondes and sounding systems
  • Dropsondes
  • Surface weather systems
  • Thunderstorm information systems
  • Weather radars
  • Windprofilers

Application and Services[edit]

  • Aviation weather systems
  • Traffic weather systems
  • Meteorological and hydrological systems

Services and Data Subscription Services[edit]

  • Customized applications, such as network operation, decision support services and tailored service packages
  • Data through Vaisala's own observation network.

Wind Resource & Energy Assessment Services // Remote Sensing Measurement for Wind Industry[edit]

  • Customized assessment services based on Numerical weather prediction (NWP) such as due diligence assessment, energy production forecasts, consulting offering
  • Vaisala's Triton is a SODAR (Sonic Detection And Ranging) device designed for use in wind energy applications

Vaisala Prize[edit]

Vaisala established a fund and together with Finnish Academy of Science and Letters, a "Vaisala Prize"[26] is created to recognize distinguished scientists in the active parts of their careers. The first prize was given in 2000, and has been awarded annually since then.


  1. ^ a b c d e "Vaisala Corporation Financial Statement Release 2020". Vaisala. Retrieved February 19, 2020.
  2. ^ "About Vaisala". Vaisala.
  3. ^ "Vaisala Acquires Veriteq Instruments Inc" (PDF). Vaisala. Retrieved 26 Nov 2018.
  5. ^ "Vaisala Acquires 3TIER Inc". Vaisala. Retrieved 26 Nov 2018.
  6. ^ "Second Wind is now part ov Vaisala". Vaisala. Retrieved 26 Nov 2018.
  7. ^ a b "Press Release: Vaisala Acquired Finnish IT Company Vionice Specialized in Computer Vision and Artificial Intelligence". October 26, 2017. Retrieved July 2, 2019.
  8. ^ "Vaisala strengthens its position in remote wind sensing by acquiring Leosphere SAS and consequently revises its business outlook for 2018". Vaisala. Retrieved 26 Nov 2018.
  9. ^ a b "Press Release: Vaisala Enters Liquid Measurement Market by Acquiring K-Patents". December 12, 2018. Retrieved July 2, 2019.
  10. ^ "Vaisala as a company". Vaisala. Retrieved 2020-12-15.
  11. ^ "Vaisala Corporation Financial Statement Release 2020". Vaisala. Retrieved 19 Feb 2021.
  12. ^ Vaisala's research on desertification processes
  13. ^ Vaisala's History website
  14. ^ "Nalezli jste radiosondu?". Retrieved 25 February 2016.
  15. ^ "Mars Rover Curiosity Equipped with Vaisala's Pressure and Humidity Sensors" (Press release). Vaisala. 24 August 2012. Retrieved 19 February 2015.
  16. ^ "Vaisala and Finnish Meteorological Institute Head for Mars with the ExoMars Mission" (Press release). Vaisala. 8 March 2016. Retrieved 10 March 2016.
  17. ^ "Comparison of Vaisala Radiosondes RS41 and RS92" (PDF). Vaisala. Archived from the original (PDF) on 16 February 2017. Retrieved 25 February 2016.
  18. ^ Vaisala Stock Exchange Release 5 November 2008
  19. ^ "Press Release: Vaisala Expands Presence in Wind Energy through Acquisition of Second Wind Systems Inc". August 14, 2013. Retrieved July 14, 2015.
  20. ^ "Stock Exchange Release: Vaisala Acquires Renewable Energy Assessment and Forecasting Services Company". December 17, 2013. Retrieved July 14, 2015.
  21. ^ "Vaisala acquires lidar producer Leosphere".
  22. ^ "Vaisala strengthens its position in remote wind sensing by acquiring Leosphere SAS and consequently revises its business outlook for 2018".
  23. ^ "Vaisala Strengthens Its Digital Offering by Acquiring Professional Business-to-Business Weather Services from Foreca". Vaisala. Retrieved 2019-08-16.
  24. ^ "Weather". Archived from the original on 2016-08-16. Retrieved 2016-09-21.
  25. ^ "Controlled Environment". Archived from the original on 2016-08-16. Retrieved 2016-09-21.
  26. ^ "The Vaisala Prize".

External links[edit]