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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.

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Rain Masking A note on Capacitative Rain Sensors John Goddard

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  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)

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