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Chapter 4
Components and Setup
14
for defined positioning of the fiberoptics relative to the leaf plane.
Also, using the PAR sensor of the leaf clip, the internal PAR sen-
sor of the MINI-PAM-II can be readily calibrated.
In the 2035-B holder, the leaf is resting on a Perspex tube with
widened crest. The tube can be vertically adjusted to account for
different leaf thicknesses. The fiberoptics axis forms a 60° angle
with the leaf plane. Optionally, a 90° fiberoptics adapter (2030-
B90)
is available for applications requiring homogenous illumina-
tion by actinic light applied
via
the fiberoptics. The distance be-
tween fiberoptics and leaf can be varied. For most applications
the minimal distance is recommended (maximal signal). Larger
distances can be defined by spacer rings. The illuminated leaf
area is limited by a steel ring with 10 mm
∅
opening.
At the bottom of the Leaf-Clip Holder 2035-B, a tripod mounting
thread is provided. Mounting the device on a tripod (e. g. Com-
pact Tripod ST-2101A) facilitates long term measurements with
the same plant.
The handle of the Leaf-Clip Holder 2035-B features a red push-
button for remote control of the MINI-PAM-II. Pressing the button
triggers a saturation pulse and associated measurements of fluo-
rescence levels for “fluorescence quenching analysis”.
Micro-Quantum-Sensor
A micro quantum sensor is integrated into the Leaf-Clip Holder
2035-B to monitor the photosynthetic active radiation (PAR, be-
tween 400 and 700 nm) to which the sample is exposed. The mi-
cro-quantum-sensor measures light intensity in µmol quanta m
-2
s
-1
. The µmol quanta m
-2
s
-1
is the unit of photon flux density.
Hence, the micro-quantum-sensor actually measures photosyn-
thetic photon flux density (PPFD).
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