pvm
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pvm [2020/08/31 22:07] – [Photovoltaic modules] bpospich | pvm [2021/03/01 11:18] (current) – [Link to current observations] bpospich | ||
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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: | + | Module II: Solarmodul First solar FS-380, thin-film |
- | * 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 | + | * Measurements with 1 minute |
- | * 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/ | ||
- | * Directly followed by a 3 beam VAD (VAD-3) (12×14sec/ | ||
- | * Every 15 minutes a velocity azimuth display scan (VAD-36) (4×124sec/ | ||
- | * Every 60 minutes a range height indicator (RHI) (1×104sec/ | ||
- | * The rest of the time is vertical staring, i.e. vertical staring is interrupted every 5 minutes and sums up to 47minutes/ | ||
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===== Data availability ===== | ===== Data availability ===== | ||
- | Most of the following data products | + | Data are available on request, please fill the {{ : |
^ Dataset | ^ Dataset | ||
- | | Vertical stare data (Backscatter, | + | | PVM data | 1 minute |
- | | 3D wind profiles from custom scanning | + | |
- | | 3D wind profiles from Doppler beam swinging | + | |
- | | Mixing layer height | + | |
- | | 3D wind profiles from VAD-36 | + | |
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===== Link to current observations ===== | ===== Link to current observations ===== | ||
- | Current observations at [[http://gop.meteo.uni-koeln.de/ | + | Current observations at [[http://atmos.meteo.uni-koeln.de/ |
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===== Measurement examples ===== | ===== Measurement examples ===== | ||
- | [[http:// | ||
- | Current VAD plot:\\ | ||
- | {{http:// | ||
- | //The figure shows a velocity azimuth display | + | {{wiki: |
- | Color shading gives the backscatter coefficient. | + | {{wiki: |
- | // | + | //Example time series of PVM observations |
- | + | ===== PVM History ===== | |
- | ===== Doppler lidar History ===== | + | ^ Period |
- | ^ Period | + | | 5. October 2016 - 02.01.2017 |
- | | 12.9.2012 | + | | 03.01.2017 - 10.06.2020 | | | | not installed (roof renovations) |
- | | 26.7.2012 - 31.8.2012 | [[https:// | + | | 10.06.2020 - today | 30°, southward |
- | | 7.11.2011 - 26.7.2012 | + | |
===== Technical specifications ===== | ===== Technical specifications ===== | ||
- | ^ Parameter | + | ^ Parameter |
- | | Wavelength / nm | + | | STC power |
- | | Pulse energy / $\mu$J | + | | Current |
- | | Pulse width / ns (m) | 150 (22.5) | + | | Voltage |
- | | Repetition Rates / s | + | | Short circuit current |
- | | | 1.67 | avg.beam i.e. N_avg pulses averaged and processed => dead time=0.67s | + | | Open circuit voltage |
- | | | 300 | Doppler Beam swing (DBS) with 3 beams ([azi,ele] = [0, | + | | System voltage |
- | | | 900 | Velocity azimuth display (VAD) with 36 beams ([azi,ele] = [i*10, | + | | Dimensions |
- | | | 3600 | vertical slice (RHI) with 18 beams ([azi,ele] = [109,i*10]) | | + | | Weight |
- | | N_avg | 15000 | number of pulses to be averaged in one ' | + | |
- | | 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< | + | |
- | | velocity precsision / ms< | + | |
- | | max velocity / ms< | + | |
- | | Aperture / mm (area / | + | |
- | | Size / cm³ | + | |
- | | Average Power consumption / W | 140/250 [600] | (wo/w Heating/ | + | |
- | | Weight | + | |
- | | Manufacturer | + | |
- | | Year | 2011 | | | + | |
- | | Instrument | + | |
- | + | ||
pvm.1598904449.txt.gz · Last modified: 2020/08/31 22:07 by bpospich