{"ob_id":11885,"uuid":"c80d904893f149b78433846617adf569","title":"FAAM/BAE systems: Hygrometer (Buck CR2)","abstract":"FAAM non-core instrument measuring dew point or frost point by a chilled mirror hygrometer.\r\n\r\nThe Buck CR2 is a chilled mirror hygrometer for use in cloud-free air - it optically monitors the temperature of a mirror when liquid water or ice begins to condense. Air is drawn through the instrument through an aft facing inlet, located 1.8 m aft of the nose, outside the 99% free-stream boundary layer. \r\n\r\nThe data frequency is measured in 1Hz and be found in this frequency in both the 32Hz and 1Hz data files. \r\n\r\nParameters in the data files are: VMR_CR2 (Water vapour volume mixing ratio measured by the Buck CR2, ppmv),VMR_C_U(Uncertainty estimate for water vapour volume mixing ratio measured by the Buck CR2,ppmv),TDEW_CR2(Mirror Temperature measured by the Buck CR2 Hygrometer, K),TDEW_C_U(Uncertainty estimate for Buck CR2 Mirror Temperature, K)","keywords":"","identifier_set":["https://catalogue.ceda.ac.uk/api/v2/identifiers/7969/?format=json","https://catalogue.ceda.ac.uk/api/v2/identifiers/7970/?format=json"],"instrumentType":"met_sensor","subInstrument":[],"responsiblepartyinfo_set":["https://catalogue.ceda.ac.uk/api/v2/rpis/45781/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/45780/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/140988/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/140989/?format=json","https://catalogue.ceda.ac.uk/api/v2/rpis/78277/?format=json"]}