PSI (Photon Systems Instruments), spol. s r.o.
Czech Republic
www.psi.cz
Welcome to Issue 17 of the PSI NEWS
This issue is dedicated to:
LaiPen LP 100
Leaf Area Analyzer
LaiPen LP 100 measures:
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Leaf Area Index (LAI)
Photosynthetically Active
Radiation (PAR)
Key Features:
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High sensitivity
Integrated sensor for
measuring foliage inclination
Measurements performed in
five different acceptance angles
Lightweight, robust, batterypowered device
Fast and easily repeatable
measurements
Manual and automatic
measurement
Large internal data storage
USB (or Bluetooth)
communication
External GPS module (optional)
Operation modes:
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Single sensor mode:
- reference measurement is taken before, after or during measurement with
the same instrument
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Two sensor mode:
- second instrument is used for automatic logging of reference signal
Other Benefits:
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Simple two-button operation
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Lightweight and durable
construction
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Straight-forward operation,
instant readouts
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Great for rapid, repeated
measurements and for large
plant screening programs
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Affordable price
PC Connectivity:
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Comprehensive software with data collection, data analysis and visualization
Export to Excel
Regular firmware updates
Technical Specification:
 Measured Parameters:
- Leaf Area Index (LAI)
- Photosynthetically Active Radiation (PAR)
 Detector Wavelength Range:
- 400 to 700 nm bandpass filters for PAR measurement
- 400 to 500 nm bandpass filters for LAI measurement
 View Restricting Cap:
- Horizontal field of view: 112º
- Vertical field of view: 16º
 Foliage Inclination of Measurement:
Angles: 0º, 16º, 32º, 48º, 64º
 Memory Capacity:
Up to 4 Mb
 Internal Data Logging:
Up to 100,000 data points.
 Display:
2 x 8 characters LC display.
 Keypad:
Sealed, 2-key tactile response.
 Keypad Escape Time:
Turns off after 3 minutes of no
use.
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 Power Supply:
4 AAA alkaline or rechargeable batteries.
 Battery Life:
48 hours typical with full operation.
 Size:
170 x 57 x 30 mm; 6.7" x 2.2" x 1.2".
 Weight:
180 g, 6.5 oz.
 Operating Conditions:
Temperature: 0 to 55 ºC; Relative humidity: 0 to 95 % (non-condensing).
 Storage Conditions:
Temperature: -10 to +60 ºC; Relative humidity: 0 to 95 % (non-condensing).
 Warranty:
1 year parts and labor.
Additional accessories
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Tripod for automatic readings in open plot
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Rod for measuring above shrubs and undergrowth
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External GPS Module
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Publications related to the topic
Jonckheere I., Fleck S., Nackaerts K., Muys B., Coppin P., Weiss M., Baret, F. (2004): Review
of methods for in situ leaf area index (LAI) determination. Part I. Theories, sensors
and hemispherical photography. Agricultural and Forest Meteorology 121: 19-35.
Nilson, T., Kuusk, A. (2004): Improved algorithm for estimating canopy indices from gap
fraction data in forest canopies. Agricultural and Forest Meteorology, 124(3-4), 157–
169.
Pokorný, R., Marek, M.V. (2000): Test of accuracy of LAI estimation by LAI-2000 under
artificially changed leaf to wood area proportions. Biologia Plantarum 43 (4): 537544.
Pokorný, R., Šalanská, P, Janouš, D., Pavelka, M. (2001): ALAI-02D – a new instrument in
forest practice. Journal of Forest Science 47, 164-169.
Pokorný, R., Tomášková, I., Havránková, K. (2008): Temporal variation and efficiency of
LAI in young mountain Norway spruce stand. European Journal of Forest Research 127
(5): 359-367.
Weiss, M., Baret, F., Smith, G. J., Jonckheere, I., Coppin, P. (2004): Review of methods for in
situ leaf area index (LAI) determination. Part II. Estimation of LAI, errors and
sampling. determination. Agricultural and Forest Meteorology, 121 (1-2): 37–53.
PSI (Photon Systems Instruments), spol. s r.o.
Drasov 470, 664 24 Drasov, Czech Republic
www.psi.cz
We are prepared to consult your exact requirements. Please contact us for detailed information and price at
info@psi.cz
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