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Large Aperture Scintillometer (LAS)

Large Aperture Scintillometer (LAS). Operational procedure at micromet -KCL Version 4 – Strand Roof Mariana L. Gouvea September 2009. Instrument. Settings Current adjust at transmitter back panel adjusted to 400 mA

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Large Aperture Scintillometer (LAS)

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  1. Large Aperture Scintillometer (LAS) Operational procedure at micromet-KCL Version 4 – Strand Roof Mariana L. Gouvea September 2009

  2. Instrument • Settings • Current adjust at transmitter back panel adjusted to 400 mA • Path length potentiometer setting at receiver back panel set to 470 – given by equation 1a, page 24 of the LAS manual – NOT equal to the distance in meters! KCL - Receiver 808 m JCM - Transmitter Location • Alignment • Move vertically and horizontally until maximum signal (at receiver back panel) • Repeat procedure at both ends (transmitter and receiver) • Important: Do NOT align using only the telescopes! • More detailed instructions in the instrument’s manual – page 20. 1

  3. (Sue’s office) Instrument Datalogger (Strand roof – right) LAS CR1000 Roof 6 Otago (see wiring diagram) LoggerNet(see setup) StrandLogger_V3.CR1 Fast files: 10 Hz data C:\LAS_data\CR1000_LASfast.dat Scheduled task: HourlySplit_LASstrand_v2 (run every 04 minutes past the hour) Scheduled task: GAS-LAS-WXT-Ceil (run every 10 minutes past the hour) Hourly files: 10 Hz data SPLIT SPLIT H:\RawData\London\KCLroof\YYYY\LAS\Hourly\ LasFastYYDDD_HH.txt GRAB HOURLY FILES C:\LAS_outdata\LasFastYYDDD_HH.txt Slow files: 15 min averaged data C:\LAS_data\CR1000_LAS.dat Scheduled task: DailySplit_LASstrand_v2 (run every day at 00:03 h) Scheduled task: LASDailyPlot (run every day at 02:24 h) Daily files: 15 min averaged data H:\RawData\London\KCLroof\YYYY\LAS\Daily\ las_YYDDD.dat C:\LAS_outdata\las_YYDDD.txt External files • H:\RawData\London\KCLroof\ • WXT510\MM\LRYYYYDD_15.txt • KCL_params_v0.txt GRAB DAILY FILES and DATA PROCESSING (DAILY PLOT) Processed data files: Plots: H:\RawData\London\KCLroof\YYYY\LAS\plots\ H:\RawData\London\KCLroof\YYYY\LAS\flux\ • LASplot_DDD.jpg • LASplotH_DDD.jpg • LASmod_DDD.jpg • LASplotU_DDD.jpg • LASflux_YYDDD.txt • LASflux_YYDDD_15.txt

  4. Wiring YELLOW GREEN GROUND RED Specification from LAS manual IN (from LAS) OUT (to datalogger) H H L L Orange Yellow Green Green Power 12V DC - Violet Channel 7 Channel 8 Brown Red Power GND - Blue Cable extension Orange High Diff channel 1 Brown High Diff channel 2 Cn2 Demod Green Low Diff channel 1 * x Low Diff channel 2 * * Must be connected with small wire (Both signals common signal ground) Violet Black Blue Blue Wire connection to channels 7 and 8 BLACK BLUE 12V GND

  5. Datalogger program: StrandLogger_LAS_V2.CR5 'CR5000 'Strand roof logger 'Program for LAS data - to be combined with other instruments 'Created by Mariana Gouvea 02/04/2009 - based on HutLogger_V1.CR3 'Constants ************************************************** Const scan_interval = 100 '100 mSec 'Declare Variables and Units ************************************ Public UCn2 Public DEMOD Units UCn2 = V Units DEMOD = mV Dim PUCn2 Units PUCn2 = m-2/3 'Define Data Tables ******************************************* 'LAS slow: sample rate 10 Hz, average period 15 min DataTable(LAS,true,-1) DataInterval (0,15,min,10) Average(1,UCn2,IEEE4,0) StdDev(1,UCn2,IEEE4,0) Average(1,Demod,IEEE4,0) StdDev(1,Demod,IEEE4,0) Average(1,PUCn2,IEEE4,0) EndTable 'LAS fast: raw data table DataTable (fast,true,-1) Sample(1,UCn2,IEEE4) Sample(1,Demod,IEEE4) EndTable 'Main Program ********************************************** BeginProg Scan (scan_interval,mSec,1,0) VoltDiff (UCn2,1,mV5000,19,true,0,250,0.001,0)'mV to V VoltDiff (Demod,1,mV5000,20,true,0,250,1.0,0) PUCn2 = (10^UCn2)*1000 CallTable fast CallTable LAS NextScan EndProg

  6. PakBus Nodes Data Files LoggerNet setup: Hardware Schedule Hardware Hardware Standard: Y Communication enabled ComPort connection: COM4 Advanced: N Call-back enabled Extra response time: 00s Delay hangup: 00s ComPort communication delay: 00s PakBus Port COM4 CR3000 Empty Standard: Y Communication enabled NPakBus port always open Maximum time online: 00h 00m 00s Maximum baud rate: 115200 Beacon interval: 00h 00m 00s Advanced: Extra response time: 00s Delay hangup: 00s Attention to file format! Standard: Y Communication enabled Y Call-back enabled PakBus address: 1 Base: Date: 29/01/2009 Time: 00:01:01 Advanced: Maximum packet size: 1000 Security code: 0 Delay hangup: 00s N Enabled automatic hole collection Collection interval: 0d 00h 6m 00s Primary retry: 0d 00h 2m 00s Number of primary retries: 3 Y Secondary retry interval: 0d 00h 15m 00s Y Scheduled connection enabled When the server’s table definition are invalid: Automatically reset changed tables * Seconds: Y for fast files, N for slow files Y Included for scheduled collection Table: Fast LAS Output file name: C:\LAS_data\CR3000_Fast.dat C:\LAS_data\CR3000_LAS.dat N Include array ID Timestamp options: Y Year; Y Day; Y Hour/minutes; N/Y Seconds*; N Midnight is 2400 Max and Min timestamp options: N TOA format Y Array datalogger format hour/minutes and seconds N Use default file name File output option: Append to file Output format: Array compatible CSV Collect mode: Y Data logged since last collection Y Collect all on first collection N Most recently logged records Clock Program Time zone offset: 00h 00m StrandLogger_V3.CR1 Automated clock check: Y Enabled Initial date: 01/01/1990 Initial time: 01:15:00 Interval: 0d 00h 05m Allowed clock deviation: 00s

  7. Parameters file: KCL_params_v0.txt % Constants: % 0.4 %1 k = Von Karman constant 9.8 %2 g = gravity acceleration (m s-2) 287 %3 R = gas constant (J kg-1 K-1) 7.9E-7 %4 gama = cte in Ct2 equation (K Pa-1) 4.9 %5 cu1 6.1 %6 cu2 4.9 %7 cs1 2.2 %8 cs2 % % % Parameters: 1.0 %9 z0 = roughness legth 27.0 %10 zl = LAS height 18.0 %11 dl = LAS displacement height 48.1 %12 zu = height of wind measurements Weightening function Strand roof (receiver) JCMB (transmitter)

  8. Daily Plot Troubleshooting 1. Otago: 1.1. Check files • Check if files exist, if they are in the correct directories and if they have the correct format 1.2. Check scheduled tasks • Run scheduled task again • If MATLAB error: try and track problem or contact responsible person • Check schedule (if set up to run at correct time) OBS: Daily plot should not stop due to missing files, but generate blank plots. 2. Roof 6: 2.1. Check files • Check if files exist, if they are in the correct directories and if they have the correct format 2.2. Check scheduled tasks (splitting) • Run scheduled task again • Check schedule (if set up to run at correct time) 2.3. Check LoggerNet setup • Attention to download schedule • Attention to output files naming and format

  9. File formats (from datalogger – before splitting) Slow files: 15 min averaged data File name structure: CR1000_LAS.dat Generated by: datalogger Fast files: 10 Hz data File name structure: CR1000_LASfast.dat Generated by: datalogger

  10. File formats (raw data after splitting) Hourly files: 10 Hz data File convention for data files stored in: H:\RawData\London\KCLstrand\YYYY\LAS\Hourly File name structure: LasFastYYDDD_HH.dat File convention started: 15:00 DOY 311 2008 (check for previous format from 23:00 DOY 199/2007) Generated by: HourlySplit_LASstrand_v2 Daily files: 15 min averaged data File convention for data files stored in: H:\RawData\London\KCLstrand\YYYY\LAS\Daily File name structure: las_YYDDD.txt File convention started: 22/09/2009 Generated by: DailySplit_LASstrand_v2

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