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Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4021) - 04 May 2024
Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
SPEED SENSORS
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- Posts: 5
- Joined: Sun 12 Jun 2011 6:44 am
- Weather Station: watson 8681
- Operating System: vista
- Location: croydon
SPEED SENSORS
Are they all the same ...moving magnet and switch below it to pulse when wind blows
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- Posts: 1125
- Joined: Sat 26 Feb 2011 1:58 pm
- Weather Station: Fine Offset 1080/1 & 3080
- Operating System: Windows XP SP3
- Location: SE London
Re: SPEED SENSORS
Hi,
By "speed", I presume you mean Windspeed. "Cup" anemometers are by far the most common type because they are reasonably accurate and linear (rotational speed proportional to windspeed), and independent of the wind direction. Similarly, magnetic sensing (reed switch or Hall sensor, etc.) of the revolutions is by far the easiest, but other methods such as optical beam interruption are sometimes used.
A few systems have used a "propeller" which is turned to face into the wind and there are other methods such as measuring the cooling of a "hot wire". But probably the most common "other" (meteorological) type uses "Ultrasonic Time of Flight": Sound waves are transmitted in two (horizontal) directions, usually at right angles, and the time taken to reach a pair of receivers is measured. Variations of the time delay indicate whether the apparent speed has been helped or hindered by the movement of the air. An advantage is that there are "no moving parts", so it's particularly suitable for adverse conditions such as mountain tops.
Cheers, Alan.
By "speed", I presume you mean Windspeed. "Cup" anemometers are by far the most common type because they are reasonably accurate and linear (rotational speed proportional to windspeed), and independent of the wind direction. Similarly, magnetic sensing (reed switch or Hall sensor, etc.) of the revolutions is by far the easiest, but other methods such as optical beam interruption are sometimes used.
A few systems have used a "propeller" which is turned to face into the wind and there are other methods such as measuring the cooling of a "hot wire". But probably the most common "other" (meteorological) type uses "Ultrasonic Time of Flight": Sound waves are transmitted in two (horizontal) directions, usually at right angles, and the time taken to reach a pair of receivers is measured. Variations of the time delay indicate whether the apparent speed has been helped or hindered by the movement of the air. An advantage is that there are "no moving parts", so it's particularly suitable for adverse conditions such as mountain tops.
Cheers, Alan.