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pvm [2020/08/31 22:06] – created bpospichpvm [2021/03/01 11:18] (current) – [Link to current observations] bpospich
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 ====== Photovoltaic modules ====== ====== Photovoltaic modules ======
  
-{{:wiki:instruments:solarpanel03.jpg?direct&600|PVM ©B. Pospichal}} \\ 
-//Photovoltaic modules installed at JOYCE// 
  
 Two photovoltaic modules are installed at IEK-8 at Forschungszentrum Jülich to measure their radiation dependent energy yield by tracking the maximum power point in the recorded I-U-Curve.  Two photovoltaic modules are installed at IEK-8 at Forschungszentrum Jülich to measure their radiation dependent energy yield by tracking the maximum power point in the recorded I-U-Curve. 
  
-Module I+Module I: SolarWorld SW 235-poly, polycrystalline 
-  * Module type: SolarWorld SW 235-poly, polycrystalline+ 
 +Module II: Solarmodul First solar FS-380, thin-film 
 + 
 + 
 +{{:wiki:instruments:solarpanel03.jpg?direct&600|PVM ©B. Pospichal}} \\ 
 +//Photovoltaic modules installed at JOYCE (front: Module I, back; Module II)//
  
-Module II: 
-  * Module type: Solarmodul First solar FS-380, thin-film 
  
  
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-===== Principle ===== 
  
-The backscattered light from an emitted laserbeam is used to measure wind speed. Analysis of doppler shift gives wind speed along the beam. Combination of several beams allows an estimate of the three components of the wind vector. Amount of received backscattered light allows calculation of backscatter coefficient. 
  
  
 ===== Measurement modes ===== ===== Measurement modes =====
  
-  * Vertical staring mode (1.67 seconds temporal resolution) +  * Measurements with minute temporal resolution (voltages, maximum current, irradiance, modue temperature)
-  * Full azimuth and elevation scan capability +
  
  
  
-===== JOYCE-CF Standard Operation Procedures ===== 
  
-The instrument performs several scanning patterns and uses the remaining time for vertical staring. 
- 
-Scan patterns are currently: 
- 
-  * Every 5 minutes doppler beam swinging (DBS) (12×14sec/hour=2min48sec/hour), i.e. one vertical and two tilted beams in eastern and western direction to derive instantaneous local wind profiles 
-  * Directly followed by a 3 beam VAD (VAD-3) (12×14sec/hour=2min48sec/hour), i.e. three tilted beams in at 0, 120 and 240 deg azimuth and 30deg zenith distance to derive instantaneous local wind profiles 
-  * Every 15 minutes a velocity azimuth display scan (VAD-36) (4×124sec/hour=8min16sec), i.e. a conical scan at 75oelevation to derive area averaged wind profiles 
-  * Every 60 minutes a range height indicator (RHI) (1×104sec/hour=1min44sec/hour), i.e. a vertical section from east to west with 5deg elevation steps (37beams) 
-  * The rest of the time is vertical staring, i.e. vertical staring is interrupted every 5 minutes and sums up to 47minutes/hour 
  
  
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 ===== Data availability ===== ===== Data availability =====
  
-Most of the following data products are provided via the SAMD database. If you would like to have additional data or recent data that have not been uploaded to SAMD yet, please fill the {{ :joyce_data_request_form.pdf |data request sheet}} and send it to [[mailto:info@joyce.cloud|info@joyce.cloud]]+Data are available on request, please fill the {{ :joyce_data_request_form.pdf |data request sheet}} and send it to [[mailto:info@joyce.cloud|info@joyce.cloud]]
  
    
 ^ Dataset     ^ Temporal resolution       ^ File size          ^ Filename   ^ Retrieval / Remarks    ^ Dataset     ^ Temporal resolution       ^ File size          ^ Filename   ^ Retrieval / Remarks   
-Vertical stare data (Backscatter, Doppler velocity)   | 2 seconds    | 1 file per day (180 MB)     | //sups_joy_dlidST00_l1_any_v00_YYYYMMDDHHMMSS.nc//  | available on SAMD   | +PVM data   | 1 minute    | 1 file per day (15-20 MB)     | //detailsYYYYMMDD.txt.gz//  | contains data from both modules   |
-| 3D wind profiles from custom scanning   | 5 minutes    | 1 file per day (3.3 MB)     | //sups_joy_dlidCUST00_l2_wind_v00_YYYYMMDDHHMMSS.nc//  | available on SAMD   | +
-| 3D wind profiles from Doppler beam swinging  | 5 minutes    | 1 file per day (3 MB)     | //sups_joy_dlidDBS00_l2_wind_v00_YYYYMMDDHHMMSS.nc//  | available on SAMD   | +
-| Mixing layer height from vertical velocity   | 5 minutes    | 1 file per day (180 MB)     | //sups_joy_dlidST00_l2_zmlaw_v00_YYYYMMDDHHMMSS.nc//  | available on SAMD   | +
-| 3D wind profiles from VAD-36   | 15 minutes    | 1 file per day (1.6 MB)     | //wind_vad-36_YYYYMMDD.nc//  |    |+
  
  
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 ===== Link to current observations ===== ===== Link to current observations =====
  
-Current observations at [[http://gop.meteo.uni-koeln.de/~Hatpro/dataBrowser/dataBrowser4.html?site=JOYCE&date=-1&UpperLeft=Windlidar_Overview&UpperRight=Windlidar_mean_w&LowerRight=Windlidar_sigma_w&LowerLeft=Windlidar_vad_from_scan|quicklook archive]]+Current observations at [[http://atmos.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser4.html?site=JOYCE&date=0&UpperLeft=PVM__Polycrystalline&UpperRight=PVM__Amorph&LowerRight=PVM__Irradiance&LowerLeft=PVM__CumulativeEnergy|quicklook archive]]
  
  
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 ===== Measurement examples ===== ===== Measurement examples =====
  
-[[http://gop.meteo.uni-koeln.de/~jschween/wind_lidar/|Click here for more plots and explanations]] 
  
-Current VAD plot:\\ 
-{{http://gop.meteo.uni-koeln.de/~jschween/wind_lidar/vad.png?400}}\\ 
  
-//The figure shows a velocity azimuth display (VAD)vectors give direction and speed of horizontal wind at time and height. Vectors pointing upward indicate south wind, vectors pointing to the right indicate west wind. +{{wiki:examples:2020-08-17_polycrystalline.png?direct&400|Poly module}} 
-Color shading gives the backscatter coefficient. +{{wiki:examples:2020-08-17_irradiance.png?direct&400|Irradiance}} \\ 
-// +//Example time series of PVM observations (leftQuicklook for the polycristalline module, right: Irradiance and efficiency)// 
- +===== PVM History ===== 
-===== Doppler lidar History ===== +^  Period   ^  Installation angle   Place  ^  Project  ^ Installed 
-^  Period  ^  Place  ^  Project +5October 2016 02.01.2017  30°southward Forschungszentrum Jülich | ET-CC yes 
-12.9.2012   today   | [[http://www.fz-juelich.de/|Research Center Jülich]]Germany [[http://www.tr32.de|TR32]] +03.01.2017 10.06.2020           | |  | | not installed (roof renovations) 
-26.7.2012 31.8.2012 [[https://maps.google.de/maps?q=50.91275522340144N+6.30132085102542E|Engelsdorf]], Germany [[http://www.tr32.de|TR32]]-[[internal:experiments:patvap]] +10.06.2020 today           30°, southward Forschungszentrum Jülich |  yes  |
-7.11.2011 26.7.2012 [[http://www.fz-juelich.de/|Research Center Jülich]], Germany [[http://www.tr32.de|TR32]] |+
  
 ===== Technical specifications ===== ===== Technical specifications =====
  
-^ Parameter Specification  Remark  ^ +^ Parameter SolarWorld SW 235-poly  First Solar - FS-380  ^ 
-Wavelength / nm  1500nm   +STC power  235 Wp   80 Wp   
-Pulse energy / $\mu$J  ~100  | see [[http://www.arm.gov/publications/tech_reports/handbooks/dl_handbook.pdf|ARM Doppler lidar handbook]] +Current   7.85 A   | 1.65 A   
-| Pulse width / ns (m)  | 150 (22.5)  | see ARM handbook +Voltage   30.2 V   48.5 V   
-| Repetition Rates  / s  | 1/15000  | i.e. 15000 laser pulses per second (=Pulse repetition frequency PRF)  +Short circuit current  8.35 A  | 1.88 A   
-                       1.67     avg.beam i.e. N_avg pulses averaged and processed => dead time=0.67s  +Open circuit voltage  37 V   60.8 V   
-                       | 300      | Doppler Beam swing (DBS) with 3 beams ([azi,ele] = [0,90],[0,75],[90,75])  | +System voltage  1000 V  1000 V   
-|                        | 900      | Velocity azimuth display (VAD) with 36 beams ([azi,ele] = [i*10,75])  | +Dimensions   1675 mm 1001 mm 31 mm  1200 mm x 600 mm x 7 mm    
-|                        | 3600     | vertical slice (RHI) with 18 beams ([azi,ele] = [109,i*10]) | +| Weight 21.2 kg  12 kg   |
-| N_avg  | 15000  | number of pulses to be averaged in one 'beam' +
-| resolution / m  | 30  | range resolution (adjustable from 15m onward) +
-| Field-of-View / deg  | 360 x 90  | free alingment of the beam  | +
-| maximum range / m | 9000  | adjustable, but restriced to sufficent backscatter (aerosol, cloud droplets or ice crystals) +
-| velocity resolution / ms<sup>-1</sup> | 0.0382  | adjustable  +
-velocity precsision / ms<sup>-1</sup>  < 0.20  for SNR > -17dB  | +
-| max velocity / ms<sup>-1</sup> | 19.2  | = Nyquist Velocity (adjustable)  +
-Aperture / mm  (area /m<sup>2</sup> 75 (4.417e-3)  see ARM handbook  +
-Size / cm³  80 53 40    | +
-| Average Power consumption / W  | 140/250 [600]  | (wo/w Heating/cooling) [The power supply shall provide 600W]  +
-| Weight / kg   | 110  with transport case  | +
-| Manufacturer  | | [[http://halo-photonics.com/|Halo Photonics]]   | +
-| Year          | 2011 | | +
-| Instrument  | [[http://halo-photonics.com/Halo%20Photonics%20Stream%20Line%20LiDAR%20system.htm|streamline ]] Instrument #17, XR version in 2010, 15kHz PRF, 10km max range   | +
- +
  
  
pvm.1598904362.txt.gz · Last modified: 2020/08/31 22:06 by bpospich