Delta Electronics SS1-UM-1.05 user manual Appendices, Logging the probe as a Linear Quantum Sensor

Page 74

Appendices

A. Logging the probe as a Linear Quantum Sensor

This application of the SunScan probe turns it into a simple Line Quantum sensor that can be attached to a data logger. No Data Collection Terminal is used, but you do require a data logger that can supply power to the probe when taking readings. The Delta-T DL2e and DL3000 loggers are suitable for this purpose.

If you want to mount the probe on a tripod, a camera mount is provided in the base of the probe handle. The probe's coiled RS232 cable is not used, and it must be protected from moisture by enclosing it in a bag with desiccant, for example.

Note: no batteries are required in the probe for this mode, but it does not hurt to leave them in situ.

Wiring connections

You must use the (optional) special logging cable which plugs into the socket on the probe handle normally occupied by the Beam Fraction sensor. The cable is 10 metres long. If you need more length, simply join on extra screened multicore cable of a similar type. Make sure the joint is weatherproof.

The cores of the probe logging cable have the following functionality:

Core

Function

Logger Connection

orange

V+

Power supply positive

Sensor power positive (switched for warm-up)

green

0V

Power supply negative

Sensor power negative (0V)

brown

HI

Signal output positive

Input channel +

grey

LO

Signal output negative

Input channel -

blue

not used

 

braid

Screen

Not connected (see below)

Note: the grey, green and braid are connected internally in the probe handle. Connecting the braid to an earthing point on the logger could create earth loops, and is not recommended.

Output

•The output signal is the transmitted PAR irradiance, averaged along the length of the probe. (Individual photodiode readings are not accessible in the Linear Quantum Sensor mode.)

•The millivolt output is linear, with a sensitivity of 1 mV = 1 ∝ mol.m-2.s-1. Maximum output is 2500 mV.

Logger requirements

•The probe requires a voltage supply of 7-15 V dc (unregulated), at about 30 mA current. The analogue output is enabled when the external voltage is greater than the battery voltage.

•Configure one channel of the logger for voltage input, with the above sensitivity.

•Use a "warm-up" time of 1 second (the logger must apply the power 1 second before taking its reading).

•The output voltage will be stable 120 ms after applying external power, and is updated every 60 ms while external power remains connected.

74 • Appendices

Document code: SS1-UM-1.05

Page 73 Page 75
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Page 73 Page 75
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 TerminalWorkabout and SunScan probe Getting StartedPreliminary checks 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 SunDataWorkabout to PC Communication checksSunScan probe to PC Running SunData in Windows Working with the Workabout SunScan TutorialAbout this tutorial 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 AveragesTo the PC Transferring the data file to your PCFrom the Workabout Initiating the file transfer from the Workabout Meanwhile, on the PC RS232 communication problems Conclusion of the TutorialSunData Screens on the Workabout File SettingsMenus and Screens 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 Flashcards reformatting Re-installing the SunData application iconDeleting unwanted Workabout files Data memory management Configuration and data file handlingSunData Configuration files Restoring a configuration Default .cfgCreating a configuration file Data files.CSV file Displaying data files on your PC.PRN file Data file layouts and data groups Page Above-canopy reference requirements Measurement optionsExperiment design Canopy type and LAI estimates Canopy Sampling volumeCanopy type and BFS practicalities Preferred light and weather conditions Planning for the sun’s positionAbsorption Advice on Absorption and Eladp valuesSetting Eladp Relationship between Mean Leaf Angle and Eladp Estimating Eladp in the fieldLAI, PAR and All displays Workabout setupSunScan System Measurement modes 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 WorkaboutExtension cables, and the location of the BFS Finding North, and setting the shade ringLevelling 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 methodTheory versus reality Derivation of Wood’s SunScan canopy analysis equationsMajor assumptions Transmission of Diffuse Light Beers law for canopy absorptionCampbells Ellipsoidal LAD equations 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 SpherSummary Scientific referencesCalculating zenith angles Jones, Hamlyn G Plants and Microclimate second edition. CUP Checking the batteries Maintenance and repairTechnical Reference section SunScan probe batteriesChecking the desiccant Factory calibration method Re-setting the factory calibrationChecking the PAR calibration 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

SS1-UM-1.05 specifications

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