Decagon Devices AccuPAR LP-80 Bedienungsanleitung

AccuPAR

PAR/LAI ceptometer

model LP-80

Operator’s Manual

Ve r si o n 1 . 0

Decagon Devices, Inc.

950 NE Nelson Court

Pullman, WA 99163

tel: (509) 332-2756

fax: (509) 332-5158

www.decagon.com/lp80

accupar@decagon.com

Trademarks

AccuPAR and Ceptometer are

registered trademarks of Decagon

LP-80

Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 1

Customer Service and Tech Support . . . . . . . . 1

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Seller’s Liability . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . 3

2. About the LP-80 . . . . . . . . . . . . . . . . . . . . . 5

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Overview of the LP-80 . . . . . . . . . . . . . . . . . . . 6

Components of the LP-80 system . . . . . . . . . . . 7

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Keyboard Operation . . . . . . . . . . . . . . . . . . . . . 8

Turning on the instrument . . . . . . . . . . . . . . . . . 9

3. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . .11

PAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Tau (t) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

LAI (L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

External Sensor . . . . . . . . . . . . . . . . . . . . . . . . . 13

Zenith Angle (z) . . . . . . . . . . . . . . . . . . . . . . . . . 13

Fraction of Beam Radiation (Fb) . . . . . . . . . . . 14

Leaf Distribution Parameter (x) . . . . . . . . . . . . 14

4. PAR/LAI Menu . . . . . . . . . . . . . . . . . . . . 17

Taking Measurements . . . . . . . . . . . . . . . . . . . 17

5. Log Menu . . . . . . . . . . . . . . . . . . . . . . . . . 20

7. File Menu . . . . . . . . . . . . . . . . . . . . . . . . . 22

View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

LP-80

Table of Contents

Send . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

New . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Delete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Delete All . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

7. Setup Menu . . . . . . . . . . . . . . . . . . . . . . . 30

Set Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . .34

Calibrate Probe . . . . . . . . . . . . . . . . . . . . . . . . .34

External Sensor Const. . . . . . . . . . . . . . . . . . . .36

About . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

8: PAR and LAI Theory . . . . . . . . . . . . . . . . 38

PAR (photosynthetically active radiation) . . 38

Average and Intercepted PAR . . . . . . . . . . . .38

Using PAR to determine Leaf Area Index . . .45

Extinction Coefficient and

Canopy Structure . . . . . . . . . . . . . . . . . . . . . . .49

LAI measurements and

Non-Random Distribution . . . . . . . . . . . . . . . .57

Zenith Angle and Equation of Time . . . . . . . .62

9. Measurement Tips . . . . . . . . . . . . . . . . . . 67

Above Canopy (External) Sensor . . . . . . . . .67

Sample Size . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Clumping in Canopies . . . . . . . . . . . . . . . . . . . .68

10. Care and Maintenance . . . . . . . . . . . . . 70

Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

Cleaning the Probe and Controller . . . . . . . . 71

Re-calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 71

General Precautions . . . . . . . . . . . . . . . . . . . . .72

LP-80

Table of Contents

iii

Appendix A:

External Sensor Information . . . . . . . . . . . 73

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .73

Spectral Response . . . . . . . . . . . . . . . . . . . . . .73

Cosine Response . . . . . . . . . . . . . . . . . . . . . . . .74

Temperature Response . . . . . . . . . . . . . . . . . .74

Long-term stability . . . . . . . . . . . . . . . . . . . . . .75

Appendix B: Further Readings . . . . . . . . . 76

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

AccuPAR LP-80

Introduction

1. Introduction

Welcome to Decagon’s AccuPAR model LP-80 PAR/

LAI Ceptometer. The AccuPAR measures

Photosynthetically Active Radiation (PAR) in the

400-700nm waveband, and can invert these readings

to give you Leaf Area Index for your plant canopy.

This manual is designed to help you accomplish

your research goals, and understand how to get the

most out of your AccuPAR.

Customer Service and Tech Support

When contacting us via fax or email, include the

following information: Your AccuPAR’s serial

number, your name, address, phone and fax

number, and a description of your problem

Phone:

Call Monday through Friday, between 8 a.m. and 5

p.m. PST.

US and Canada (toll-free): 1-800-755-2751 .

Outside of the US and Canada: (509) 332-2756.

Fax:

(509) 332-5158.

AccuPAR LP-80

Introduction

E-mail:

[email protected].

Warranty

The AccuPAR has a one year warranty on parts and

labor. It is activated upon the arrival of the

instrument at your location.

Seller’s Liability

Seller warrants new equipment of its own

manufacture against defective workmanship and

materials for a period of one year from date of

receipt of equipment (the results of ordinary wear

and tear, neglect, misuse, accident and excessive

deterioration due to corrosion from any cause are

not considered to be a defect); but Seller’s liability

for defective parts shall in no event exceed the

furnishing of replacement parts f.o.b. the factory

where originally manufactured. Material and

equipment covered hereby which is not

manufactured by the Seller shall be covered only by

the warranty of its manufacturer. Seller shall not be

liable to Buyer for loss, damage, or injuries to

persons (including death), or to property or things

of whatsoever kind (including, but not without

limitation, loss of anticipated profits), occasioned by

or arising out of the installation, operation, use,

misuse, nonuse, repair, or replacement of said

material and equipment, or out of the use of any

AccuPAR LP-80

Introduction

method or process for which the same may be

employed. The use of this equipment constitutes

Buyer’s acceptance of the terms set forth in this

warranty. There are no understandings,

representations, or warranties of any kind, express,

implied, statutory or otherwise, (including, but

without limitation, the implied warranties of

merchantability and fitness for a particular purpose),

not expressly set forth herein.

Repair Instructions

If your AccuPAR needs to be sent in for service or

repair, call Decagon at (509) 332-2756 or 1-800-

755-2751 (US and Canada).We will ask you for

your address, phone number, and serial number.

For non-warranty repairs, we will also ask for a

purchase order number, a repair budget, and billing

address.

When shipping your instrument back to us, include

a document listing the complete shipping address,

name and department of the person responsible for

the instrument, and (most importantly) a description

of the problem. This will better help our technicians

and our shipping department to quickly expedite

repair on your instrument and ship it back to you.

Pack your AccuPAR carefully. Ship it back in the

black carrying case, preferably inside a cardboard

AccuPAR LP-80

Introduction

box. Ship to:

Decagon Devices Inc.

950 NE Nelson Court

Pullman, WA 99163

Repair Costs:

Manufacturer’s defects and instruments under

warranty will be repaired at no cost. For non-

warranty repairs, costs for parts, labor, and shipping

will be billed to you. We have a $65 minimum

charge for repair that takes one hour or less. For

repair over one hour the labor rate is $65/hour.

AccuPAR LP-80

About the LP-80

2. About the LP-80

The AccuPAR model LP-80 is a menu-driven,

battery-operated linear PAR ceptometer, used to

measure light interception in plant canopies, and to

calculate Leaf Area Index (LAI). It consists of an

integrated microprocessor-driven datalogger and

probe. The probe contains 80 independent sensors,

spaced 1cm apart. The photosensors measure PAR

(Photosynthetically Active Radiation) in the 400-

700nm waveband. The AccuPAR displays PAR in

units of micromols per meter squared per second

(µmol m-2s-1). The instrument is capable of hand-

held or unattended measurement.

Specifications

Operating Environment:

• 0° to 50° C (32°-122° F)

• 100% relative humidity

Probe Length: 86.5 cm

Number of sensors: 80

Overall Length: 102 cm (40.25 in)

Probe Cross-Section: 19cm x 9.5cm (.75 x .375 in)

Microcontroller dimensions: 15.8 x 9.5 x 3.3cm (6.2

x 3.75 x 1.3 in.)

PAR Range: 0 to >2,500µmol m-2s-1

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