Delta-T Devices SunScan SS1 Manuale utente

User Manual for the

SunScan

Canopy Analysis System

typeSS1

Delta-T Devices Ltd

SS1-UM-3.3

Weitere Infos auf www.upgmbh.com oder [email protected]

Notices

copied, in whole or in part, without the written consent of Delta-T Devices

Ltd. Under the law, copying includes translation into another language.

Peak Design Ltd, Wensley Road, Winster, Derbyshire, U.K.

Trademarks

Windows is a registered trademark of Microsoft Corporation.

All other trademarks are acknowledged. Some names referred to are

registered trademarks.

CE Conformity

The SunScan system conforms to EU regulations regarding

electromagnetic emissions and susceptibility and is CE marked by

Delta-T Devices Ltd.

For certificates look on our website at www.delta-.co.uk ,

or the Delta-T Software and Manual DVD

or look in Start, All Programs, SunData, Documents.

Warnings

To maintain conformance to CE standards, the equipment must be used

as described in this manual. Modifications to the equipment may

invalidate CE certifications.

Delta-T Devices Ltd reserves the right to change the designs and

specifications of its products at any time without prior notice. The

information in this document is subject to change without notice.

Authors

Nick Webb, Chris Nicholl, John Wood, Ed Potter.

User Manual Version: 3.3 Jun 2016

Delta-T Devices Ltd

130 Low Road, Burwell

Cambridge CB25 0EJ

Tel:+44 (0)1638 742922

Fax:+44 (0)1638 743155

email:sales@delta-t.co.uk

web:www.delta-t.co.uk

SPN1 User Manual v3.3 3

Contents

Notices 2

Contents 3

Introduction 6

About this manual 6

Accessory manuals 6

To obtain manuals 6

Overview 7

Uses 7

Parts and Accessories 8

Summary 8

Description 9

System Connection Options 12

Quick Start 13

Button Actions 13

Alternative ways of controlling SunScan. 13

Use the Emulator 14

Read SunScan PAR 15

Change SunData Settings 16

Take LAI Readings 17

Review Data 19

Reviewing Display Type: All data 19

PC Operations 20

Connecting to your PC 20

Install SunData software 21

Transfer SunData data files to your PC 21

Configuration and data file handling 22

Configuration files 22

Data Files 24

Displaying data files on your PC 25

Menus and Screens 27

File menu options 27

Settings menu options 28

Utilities menu options 30

What to Measure and How 32

Experiment Design 32

4 Contents SPN1 User Manual

Above-canopy reference requirements 32

Direct and Diffuse components 34

Canopy type and BF5 practicalities 34

Canopy type and LAI estimates 35

Canopy sampling volume 35

Preferred light and weather conditions 36

Planning for the sun’s position 36

Advice on Absorption and ELADP values 37

SunScan Measurement modes 40

Measurement procedures in the field 43

LAI theory 49

Ingredients of the LAI computation method 49

Theory versus reality 50

Derivation of Wood’s SunScan canopy analysis equations

The major assumptions 51

Beer's law for canopy absorption 51

Campbell's Ellipsoidal LAD equations. 51

Transmission of Diffuse Light 52

Modelling the canopy transmission 54

Accuracy of LAI calculations 56

Functions used to model canopy transmission 57

Diffuse light - cosine response sensor 57

Diffuse light - hemispherical response sensor. 57

Modelling incomplete PAR absorption and scattering 59

Calculating zenith angles 60

Summary 60

Scientific references 61

Technical Reference 62

Maintenance 62

Batteries 62

Desiccant 65

Checking the PAR calibration 66

Troubleshooting 67

Problem Reports 67

Specifications 68

SunScan Probe type SS1 68

Beam Fraction Sensor type BF5 68

Nomad PDA 69

SunScan Probe with Radio 69

SunScan Radio Module 69

SunScan to BF5 Cable 70

SunScan to BF5 Extension Cables 70

SPN1 User Manual v3.3 5

Telescopic Tripod 71

Carrying Case 71

SunScan Probe Spares Kit type SPS1 71

BF5 Spares Kit type BF5-SP 71

PAR Performance 72

Appendices 74

A. Logging the probe as a Linear Quantum Sensor 74

B. Logging the Beam Fraction sensor 75

Glossary 76

Technical Support 78

Terms and Conditions of sale 78

Service and Spares 79

Technical Support 79

Contact Details 79

Index 80

6 Introduction SS1 User Manual v3.3

Introduction

About this manual

This shows how to use the SunScan Canopy Analyser and its accessories

See also:

SunScan Quick Start Guide.

SunScan Technical Manual (available as a PDF file).

Accessory manuals

BF5 Sunshine Sensor User Manual.

SunScan System Radio Link User Manual Supplement.

To obtain manuals

Select Start, Programs, SunData, Documents on your PC to

display the complete set of SunScan manuals as PDF documents.

These are installed when you install SunScan’s SunData version

2.0 or later software on your PC.

These may be read using Adobe Reader obtainable online from

adobe.com.

Download them from our website at www.delta-t.co.uk

Look on the Delta-T Software and Manuals DVD

Contact your distributor or contact us direct at Delta-T.

SS1 User Manual v3.3 Introduction 7

Overview

Uses

Leaf Area Index

In some types of canopy you can estimate leaf area index (LAI) with

reasonable accuracy. For best results a BF5 sensor should also be used.

PAR measurements

SunScan can be used as a portable line quantum sensor for measuring

levels of photo-synthetically active radiation (PAR) in plant canopies.

Fractional Interception

You can also measure what fraction of the solar radiation is being

intercepted by a plant canopy. For best results include a BF5 Sensor.

PAR Mapping

You can rapidly find average levels of PAR beneath the canopy, or make

linear transects of the PAR distribution within a canopy.

Auto-logging and Linear Quantum Sensor modes

You can leave SunScan unattended, automatically logging variations in

PAR at one place.

Data may be logged either to a PDA, or to an analogue data logger.

PDA logging is best, the Autolog utility giving the most measurement

options.

If used with an analogue data logger, SunScan functions as a line

quantum sensor with a single analogue output. See Appendix A.

8 Introduction SS1 User Manual v3.3

Parts and Accessories

Summary

SunScan probe

no radio

SunData software for

Windows Mobile

Ruggedised PDA running

Windows Mobile 5 or 6

Sunshine Sensor

Radio transmitter for

BF3, links to SS1-RL4

SunScan Probe + radio

receiver (434 MHz) links

to BF-RL4

Telescopic tripod for

BF3 (BF1, BF2)

BF5 to SunScan(SS1)

5m cable

SS1

SDA2

RPDA-1

BF5

BF5-RL4

SS1-RL4

SS-TD

SS-HB1

SunScan SCC1

Holster Belt for

PDA

and Sunscan

Carrying case for

SunScan

SS-PC1PDA carry case

EXT/8w-xx BF5 to SS1 extension

cable, xx = 5,10 or 25m

EXT/8w-05

SS1 User Manual v3.3 Introduction 9

Description

SunScan probe

The light sensitive “wand” of the probe is 1 metre long, containing 64

photodiodes equally spaced along its length. The probe handle contains

batteries and electronics for converting the photodiode outputs into digital

PAR readings, which get sent to your PDA via the RS232 link.

An optional radio link is available for BF5.

Beam Fraction sensor

The Beam Fraction sensor (BFS) also measures PAR light

levels. It is used to monitor the light incident on the canopy at

the same time as you are making measurements beneath it.

Beam fraction sensors incorporate multiple photodiodes, of which one is

always shaded. This patented design allows the direct and diffuse

components of PAR to be separated, which

is necessary for the computation of LAI.

A radio transmitter is available for connection

to SunScan fitted with a radio link.

BF5 and BFS Terminology

We continuously improve the design of our beam fraction sensors.

All are interchangeable and compatible with SunScan

The current model is the BF5.

The newer versions are called Sunshine Sensors - they all measure direct

and diffuse radiation, and so all are Beam Fraction Sensors

Note: The SunData software refers to them all as BFS sensors.

PDA

To configure, observe and store readings from the SunScan

probe, you need a Personal Digital Assistant or PDA running

Windows 2003 or Mobile 5 or 6.

Apart from the BF1 which is not compatible with the radio link option.

10 Introduction SS1 User Manual v3.3

SunData software

The SunData software pre-installed on your PDA is ready to control

SunScan - to take readings, display and store results, and review data.

It is easy to use, but a familiarity with Windows Mobile helps.

SunData version 2 and later runs on a PDA, using Windows Pocket PC

2003 or Windows Mobile 5 or 6.

Three measurement modes are provided, plus an automatic logging

option.

Results can be imported into spreadsheets or other applications for

analysis on the PDA or a PC.

Transferring readings as data files from the PDA to a PC is a simple drag

and drop operation.

Carrying Case

The sturdy field

Carrying Case will

protect the SunScan

system during

transportation and

storage. It has room

for an optional tripod

mount which is

intended primarily for

use with the BF5, (but

can take the SunScan

probe). Space is also

provided for extension

cables that may be ordered with the BF5.

Holster Belt

This optional belt has two holsters - for the PDA and the SunScan probe.

The PDA holder has two positions, close to the body for transport, or up

and out for “Hands–free” operation of the PDA.

Both holsters can also slide around your body.

Other PDAs may not fit.

Radio Link

A 434 MHz radio option links the BF5 to a modified SunScan Probe –

useful in situations where a cable is inconvenient.

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