Windsond for TORUS

Windsond is playing a big part in the NSF and NOAA supported project TORUS (Targeted Observations using Radar and UAVs in Supercells) in the US. The TORUS project aims at understanding the relationships between severe thunderstorms and tornado formation.

More information on the project is found at

TriSonica Sphere Wind Flux Sensor

The manufacturer Anemoment LLC will shortly launch the TriSonica Sphere Wind Flux Sensor. This product was developed to address the growing demand for a compact, lightweight, 3D sonic anemometer that can accurately and precisely measure vertical wind velocity. Sparv Embedded is an approved distributor. Reach out to us if you are interested to order the sensor as is, or integrated with Sparv Embedded’s sensor system Sparvio.

More information on the Trisonica Sphere Wind Flux Sensor

Summer holiday and latest software version

The latest Windsond (version 2) software can be downloaded here: One bug was detected that could cause the program to slow down. This has been fixed and we suggest that you download the latest version. Please reach out to if you have any questions.

As usual, we will close the office a few weeks during the summer. We’ll be on summer vacation July 9 – August 9. During this time, we can’t give you our usual, fast response time. Sending an email to both and during this period will increase your chances to get hold of us.

Have a great summer!

Merry Christmas

Sparv Embedded wishes you a very Merry Christmas and a Happy New Year!

The office will be closed December 23rd – January 3nd. Take care and be safe.

Swarmsonde enables new and exciting projects


The video shows a severe weather research team in the US operating the two-balloon Windsond system “Swarmsonde” in heavy winds. As you can see, the sondes are launched directly from a car, illustrating the great portability of the small size Windsond system.

The research team’s ambition is to get close to, and in front of a tornado, in the inflow region, and launch Swarmsonde radiosondes. The team will get much closer to tornadoes than other groups in order to get measurements in the tornado at low altitudes. The sondes will become neutrally buoyant at about 100-200 m AGL and float toward the tornado vortex. Launching from a car this close to tornadoes is only made possible using the Windsond system due to the equipment’s advantageous and unique size.

How does Swarmsonde work? 
When the sonde is released from the ground it is attached to two balloons instead of one. At a user-defined altitude, one balloon is automatically cut off from the sonde. The balloon that still is attached to the sonde makes it neutrally buoyant, giving measurements at the preferred altitude for a longer time. 

More information on Swarmsonde:

Sparv Embedded offerings

We have made an executive summary on what measurement capabilities we offer today and the current TRL (technology readiness level) for each offering. See link below.

Sparv Embedded offerings

Let us know if you have any questions.

Send email to


Summer holiday 2020


The blog has not been updated much lately. We have worked a lot on the next Windsond version, S2. It has also been a very unique spring due to COVID-19 and we have been affected as almost everybody. It has not hit us as hard as was expected in the early stages of the pandemic, and we have not been required to slow down in regards to development or work force.

The office will be closed during July 11 – August 2 due to summer holidays. During this time, we can’t give you our usual, fast response time. However, if you have any inquiries during this period, please email both and

Have a great summer!

Working on next generation of Windsond and optional add-on

Closing in to 2020, we would like to tell you what we have been up to lately and tell about our availability during the Christmas holidays.

We have been happy with the Windsond S1 model, but we feel that we want to offer an even better radiosonde to the market. That is why we are developing next generation of Windsond, called “S2”. We also mentioned this in the newsletter from earlier this year. The development is still in an early phase, so we can not reveal any release date. We have great faith in Windsond S2 and we are eager to show you the result. Some improvements that S2 will bring:

– Lower weight
– Smaller
– Easier to use
– Quicker GPS fix
– Better battery life
– Adapted for soundings in rain

We have also started evaluating an optional add-on to Windsond S2, called H4, with sophisticated T/RH sensors. With response time of a fraction of a second and possible sampling rates of 10 Hz, this enables data of very high spatial resolution. Active heating can overcome condensation. This also opens up to supporting higher altitudes (maybe 10-20 km MSL).

We will share more information as development continues. Please reach out to us if you have any questions.


The office will be closed December 21st – January 2nd. We wish you all a Merry Christmas and a Happy New Year!



Summer holiday 2019

Hello everyone!

The office will be closed during July 15-21 due to summer holidays. Some of our staff will be on vacation until first and second week of August.  During this time, we can’t give you our usual, fast response time.

Have a great summer!

High resolution methane measurements from UAVs

Sparv Embedded is helping Linköping University to integrate a high precision CH4 (methane) sensor from Aeris Technologies with the Sparvio system. The sensor has an unprecedented CH4 resolution for its size, measuring variations smaller than one ppb (parts per billion). This is more than enough to map background levels, around 2 ppm. To use the same unit, the sensor measures at 0.0001 ppm resolution. After we adapted the sensor for UAV use, the payload weighs in at 1.8 kg. This is light enough to be flown around 10 minutes with a fairly small quadcopter. If given more attention, the weight could be pushed down a lot more.

This offers an exciting possibility for more convenient sampling of methane, a gas with a greenhouse effect 84 times stronger than carbon dioxide when counted over 20 years after releasing the gas into the atmosphere. In spite of this, methane emissions are still largely ignored by industries and regulation. Can more measurements help to raise awareness of the environmental importance of methane?

The picture below is from the preparations for a demo on May 15th. It shows a quadcopter hovering with the white Aeris sensor attached underneath. The quadcopter also carries a Sparvio sensor system that synchronizes data from Aeris with readings from an ultrasonic wind sensor, GPS and other sensors. Sparvio logs all data and transmits it to a ground station to visualize on a map in real-time. In the end, the combination of all data will be used to calculate not only the location of methane emission sources, but also the quantity of gas flow.

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58222 Linköping, Sweden
Phone: +46 (0)707 312608