[wxqc] Rain Sensor With No Moving Parts

Gerald Creager gerry.creager at tamu.edu
Wed Oct 26 08:12:57 CDT 2011


It's a piezo sensor that looks at impact intensity and the frequency 
derived by droplet size. It cannot sense snow but can differentiate 
sleet and hail from rain.

On 10/25/2011 11:40 AM, Mark Wyman wrote:
> I wonder if it is a combination of piezo effect for counting and
> dielectric measurement for flow. Piezo measures the energy content of
> the drops as they hit (and counts them), and dielectric to measure the
> capacitance of the water on the surface of the gauge to provide some
> sort of alg to get a pretty good measurement on rain rates. Once you
> know an accurate rate you can determine total rain. Cannot imagine it
> doing very well on sleet and hail though.
>
> I know some folks who worked on a sensor to automatically turn on
> windshield wipers on cars based on the change in capacitance between the
> inside glass and outside water + atmosphere. Worked very well at
> determining a certain threshold at which to turn them on.
>
> -Mark
>
> On Tue, Oct 25, 2011 at 1:03 PM, Ted Lum
> <gladstonefamily45.net at tedlum.com
> <mailto:gladstonefamily45.net at tedlum.com>> wrote:
>
>     Just my opinion but I think doppler radar is the best visual tool
>     for viewers. A single rain guage is too localized... I mean it is
>     what it is, I just like seeing the pattern over an area.
>
>
>     On 10/25/2011 11:03 AM, Paleski, Richard wrote:
>
>         My guess is you are right about the size of the measurement area
>         Victor. The unit we own is sizable. It is maybe 6 to 8 inches
>         across the top.
>
>         We don't have the rain sensor on our mobile unit but I am
>         considering that upgrade. When we are on location, I would like
>         to provide some sort of rain rate data for the viewers.
>         Moreover, I thought this was a cute idea and one more cleaver
>         measurement method out in the universe is always food for thought.
>
>         Rich
>
>         -----Original Message-----
>         From: wxqc-bounces at lists.__gladstonefamily.net
>         <mailto:wxqc-bounces at lists.gladstonefamily.net>
>         [mailto:wxqc-bounces at lists.__gladstonefamily.net
>         <mailto:wxqc-bounces at lists.gladstonefamily.net>] On Behalf Of
>         Victor Engel
>         Sent: Tuesday, October 25, 2011 10:51 AM
>         To: Discussion of weather data quality issues
>         Subject: Re: [wxqc] Rain Sensor With No Moving Parts
>
>         It says "Collection Area: 602cm". That is not a unit of area.
>         Supposing they mean cm^2, that's a pretty large area.
>
>         Victor
>
>         On Tue, Oct 25, 2011 at 9:40 AM, Paleski,
>         Richard<paleski at kyw.com <mailto:paleski at kyw.com>>  wrote:
>
>             Hi Everyone,
>
>
>
>             http://www.columbiaweather.__com/Orion420.html
>             <http://www.columbiaweather.com/Orion420.html>
>
>
>
>             This is the newest product from Colombia Weather Systems.
>
>             They integrate an OEM / military grade weather sensor into
>             their weather
>             server.
>
>             They measure wind speed and direction using ultrasonic sound
>             and Doppler
>             information.
>
>             Now they have added a drum type sensor that counts rain
>             drops as they fall
>             onto the unit.
>
>
>
>             Given the last round of rain rate calibration discussions, I
>             thought many of
>             you would all find this new device interesting.
>
>
>
>             Best,
>
>
>
>             Rich
>
>
>
>
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.862.3983
Office: 7607 Eastmark Drive, Suite 112, College Station, TX 77840


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