Delta-T Devices SunScan SS1 User Manual page 18

Taking readings for estimating Leaf Area Index is simpler with an external
beam fraction sensor (BFS) attached, such as the BF5 Sunshine Sensor.
Note 1: If no BFS is attached, SunScan initially takes you through an extra
step to measure the Beam Fraction. A typical sequence of readings is
shown in the diagram below.
Note2: The SunData software doesn't automatically detect if a BF5 is
connected, the user has to set this as stated in the diagram on p16.
See also: Measuring Leaf Area Without a Beam Fraction Sensor on
page 33.
Diagram illustrating the measurement of Leaf Area Index
without a Beam Fraction Sensor
Total
Diffuse
Incident
Transmitted
18  Quick Start
Direct
Diffuse
Direct
Direct
Diffuse
Direct
Diffuse
Measure
Beam
Fraction
Measurement
type
Measure
Beam
Fraction
Incident
Read
Read
Typical sequence of
measurements for LAI
without a BFS
Incident Incident Incident
Read Read Read
SS1 User Manual v3.3
Measure
Beam
Fraction
Read
Time