1 / 10

Rain Masking A note on Capacitative Rain Sensors John Goddard

R. R. A. F. C. Chilbolton Facilities for Atmospheric and Radio Research. Rain Masking A note on Capacitative Rain Sensors John Goddard. R. R. A. F. C. Chilbolton Facilities for Atmospheric and Radio Research.

jalena
Download Presentation

Rain Masking A note on Capacitative Rain Sensors John Goddard

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. R R A F C Chilbolton Facilities for Atmospheric and Radio Research Rain Masking A note on Capacitative Rain Sensors John Goddard

  2. R R A F C Chilbolton Facilities for Atmospheric and Radio Research • Investigation into use of simple rain detectors to flag onset and cessation of rain • Valuable for quality control of radar vertical profiling • Comparison of sensors was described at 3rd Cloudnet meeting • Included • tipping bucket raingauges • drop counting raingauges • disdrometers • optical sensors • Conclusions were: • Distrometer and Optical gauge - both good indicators of precipitation onset • Drop counting gauges lag these by 2-5 minutes • (maybe depending on how wet the collector has remained since the last event) • Tipping bucket gauge - not useful for this purpose • - lags of tens of minutes in weak precipitation • - 2 factors, collector wetting and bucket capacity

  3. R R A F C Chilbolton Facilities for Atmospheric and Radio Research • Action 3.1 from the meeting was to investigate capacitative sensors • may be cost effective solution? • Two types of capacitative sensor have been deployed at Chilbolton • primarily to assist rain data quality control • eliminating calibration spikes, etc • Vaisala DRD11A Rain Detector • Sontay WD-RS Rain sensor

  4. R R A F C Chilbolton Facilities for Atmospheric and Radio Research WD-RS Rain Sensor DRD11A Rain Detector

  5. R R A F C Chilbolton Facilities for Atmospheric and Radio Research DRD11A deployed • Both instruments have heated surfaces • eliminates fog and dew • reduces effects of snow • (not tested at Chilbolton yet!) • Both instruments use ttl voltage levels • (0 or 5V for rain/no rain) • DRD11A has additional delay circuitry giving 2 minute interval between drops before setting the no rain state • DRD11A interface was straight forward • WD-RS required additional interface circuit

  6. R R A F C Chilbolton Facilities for Atmospheric and Radio Research Example from 1 October 2003

  7. R R A F C Chilbolton Facilities for Atmospheric and Radio Research Expanded view

  8. R R A F C Chilbolton Facilities for Atmospheric and Radio Research End of the event

  9. R R A F C Chilbolton Facilities for Atmospheric and Radio Research Blip

  10. R R A F C Chilbolton Facilities for Atmospheric and Radio Research • Conclusions • Instruments have similar characteristics • DRD11A is easier to install • it is appears to be more sensitive (over-sensitive?) • WD-RS sensor costs ~€170 • (www.sontay.com) • DRD11A sensor costs ~€740 • (www.vaisala.com)

More Related