Delta Electronics SS1-UM-1.05 Setting up a measurement session, Working through the menu options

Page 18

Setting up a measurement session

Working through the menu options

In normal use the SunData software calculates Leaf Area Index (LAI) based on readings from the SunScan probe and from the Beam Fraction Sensor (if fitted). These calculations also require information about the distribution of leaf angles and absorption of light by leaves within the canopy and knowledge of the solar angle calculated from the time of day and local latitude and longitude.

SunScan probe

 

 

Average PAR within canopy

 

 

Beam fraction

 

 

PAR above canopy

ï

 

 

 

 

 

 

 

 

Ratio of Direct to Total light

ï

 

ELADP setting

 

 

 

Leaf Angle Distribution

ï

Leaf Area Index

 

 

 

Absorption setting

 

 

Leaf PAR Absorption

 

Time and date

ü

 

ï

 

Latitude setting

 

 

Solar zenith angle

 

 

Longitude setting

 

 

 

 

 

Before it can make sensible calculations of the Leaf Area Index, SunData needs to know what values to use for the above settings.

♦ Press Menu, use the ← → arrow keys to select the Settings menu, and the ↑↓↓ keys to highlight Site, and press Enter. Type in a Name for your present site, and set the Latitude and Longitude by pressing Del and typing in the appropriate values. When everything is correct, to accept it

♦ Press Menu again, then select Time & Date and press Enter. Now set the local time and date in the dialog box. You also need to set the appropriate offset from GMT for your time zone. Set Local time is GMT to between -12.0 and +13.0 hours. Remember to make allowance for any special seasonal offsets, such as “Summer Time”, “Daylight Saving”. For example: British Summer Time is GMT+1, India is GMT+5.5, and USA EST is GMT - 5.0.

♦Press Enter to accept the settings and return to the Title screen.

Note: The date and time formats can be changed, but for the moment just get the information correct. To change am to pm, select it, and press p (or a).

♦ Use the ← → arrow keys to set the Absorption to 0.85. Set the ELADP (Ellipsoidal Leaf Angle Distribution Parameter) to 1. Press Enter to accept these settings.

Later sections in Measurement Options and LAI Theory give explanations and advice on choosing values for these parameters.

♦ Set the Display format to LAI. Leave the ‘Sample’ and ‘Plot’ names unchanged.

The options for Display (LAI, PAR and All) have an important effect on the display of readings but they also interact with the setting for Ext sensor (BFS or none) to determine the sequence of readings required.

18 • SunScan Tutorial

Document code: SS1-UM-1.05

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Contents SunScan SS1-UM-1.05Trademarks CopyrightAcknowledgements CE conformityContents LAI theory Menus and Screens More Psion and file handling notesMeasurement options Technical Reference sectionAppendices IndexSunScan Canopy Analysis System How to use the manualsIntroduction Organisation of this manualBeam Fraction sensor Field accessoriesSunScan probe Data Collection TerminalGetting Started Preliminary checksWorkabout and SunScan probe Checking the Workabout hardware SunData s/w Diskette Installing the SunData s/w in your PCInstalling the s/w What the s/w doesSetting up your PCs COM port Running SunDataCommunication checks SunScan probe to PCWorkabout to PC Running SunData in Windows SunScan Tutorial About this tutorialWorking with the Workabout What to do if you get lost Starting SunData in the WorkaboutUsing a PC instead of the Workabout Starting the PC softwareThis page is intentionally blank Setting up a measurement session Working through the menu optionsFile Saving Hot KeysUsing the Emulator mode Taking readingsConnecting the SunScan probe Without a Beam Fraction SensorConnecting the Beam Fraction Sensor Measuring Leaf Area Index without a Beam Fraction Sensor Reviewing your data file AveragesTransferring the data file to your PC From the WorkaboutTo the PC Initiating the file transfer from the Workabout Meanwhile, on the PC RS232 communication problems Conclusion of the TutorialSunData Screens on the Workabout Settings Menus and ScreensFile Contd UtilsQuit Workabout User Guide More Psion and file handling notesNavigating Psion directories and screens Navigating the Psion directories and screensPsion subdirectory usage in file select dialogs Re-installing the SunData application icon Deleting unwanted Workabout filesFlashcards reformatting Configuration and data file handling SunData Configuration filesData memory management Restoring a configuration Default .cfgCreating a configuration file Data filesDisplaying data files on your PC .PRN file.CSV file Data file layouts and data groups Page Measurement options Experiment designAbove-canopy reference requirements Canopy Sampling volume Canopy type and BFS practicalitiesCanopy type and LAI estimates Preferred light and weather conditions Planning for the sun’s positionAdvice on Absorption and Eladp values Setting EladpAbsorption Relationship between Mean Leaf Angle and Eladp Estimating Eladp in the fieldWorkabout setup SunScan System Measurement modesLAI, PAR and All displays Autolog function Probe GO button Measurement procedures in the fieldProbe handling in the field Levelling the probeUse of the tripod Using the tripodBFS handling in the field WorkaboutFinding North, and setting the shade ring Levelling the BFSExtension cables, and the location of the BFS Checking the probe/BFS matching PAR calibrationsFactory light calibration Recalibrate optionEffect of the shade ring on the BFS Routine maintenance and cleaningRestoring the factory calibration Comparing the calibration with other PAR sensorsEnvironmental and moisture protection SunScan probe and Beam Fraction SensorLAI theory Ingredients of the LAI computation methodDerivation of Wood’s SunScan canopy analysis equations Major assumptionsTheory versus reality Beers law for canopy absorption Campbells Ellipsoidal LAD equationsTransmission of Diffuse Light Transmission fraction τ Is given by I/I0 Modelling the canopy transmission Diffuse light transmission cosine corrected sensorDetail Diffuse light cosine response sensor Functions used to model canopy transmissionAccuracy of LAI calculations Diffuse light hemispherical response sensorModelling incomplete PAR absorption and scattering Exp 0.1 . x . atan 0.9 Atan L Q SpherScientific references Calculating zenith anglesSummary Jones, Hamlyn G Plants and Microclimate second edition. CUP Checking the batteries Maintenance and repairTechnical Reference section SunScan probe batteriesChecking the desiccant Re-setting the factory calibration Checking the PAR calibrationFactory calibration method Psion Workabout TroubleshootingProblems running the SunData application While running SunDataInsufficient power to write data reported Technical Support Beam Fraction Sensor type BF1 SpecificationsSunScan Probe Type SS1 Data Collection Terminal type DCT1 Psion WorkaboutSpares Kit type SPS1 Carrying Case type SCC1Telescopic Tripod type BFT1 Logging CablesPAR Performance Spectral responseCosine responses of probe and BFS SunScan system cosine responseAppendices Logging the probe as a Linear Quantum SensorLogging the Beam Fraction sensor Workabout SunData s/w Upgrading the SunScan systemSunData PC s/w Revision HistoryPsiWin File transfer between Workabout and PCChoice of different programs Workabout Remote LinkExample using Slink Slink and RcomDrives on the PC are referred to as REMA, Remc REM = remote Example using Rcom Documentation of Rcom and SlinkSending a file to a Communication program Using the Workabout Comms applicationAlternative file transfer mechanisms Sending a file to a serial printerGlossary Page Index AccuracyIndex Field use 39, 46, 48, 50, 51, 58

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