Geneq > Biotechnologie > Chlorophyle - Mesureurs
Appareil portatif de mesure de la surface foliaire
Modèle CI-202

The CI-202 Portable Laser Area Meter uses advanced laser technology to provide researchers with a precise and convenient method of measuring leaf area. The high-resolution laser scanner, data logger, and display are enclosed in a hand-held self-contained unit. Ideal for field use, the scanner head and palette format base weigh approximately 1.5Kg.
Researchers can perform non-destructive measurements on the leaves of living plants by simply sliding the scanner over the leaf, enabling collection of data from the same plant, or even the same leaf, throughout its life span.
Precise leaf area measurement of tender leaves is possible by using a transparent sheath for the leaf’s protection.

CI-202
  • Precise and accurate
  • Fast, non-destructive measurements
  • Durable and lightweight
  • Ideal for field use
  • Stores over 8000 data points
  • Download data to computer

What's in the box
The CI-202 includes:
  • Palette style scan board
  • Laser scanner with built-in control unit
  • Internal batteries
  • Battery charger
  • Communication software
  • One additional transparent film
  • Operating manual

Theory of operation
The CI-202 collects length, width, perimeter, and area measurements
directly using a combination of a sweeping laser beam and an optical motion sensor. After activating the device by pressing the <start> key, a low energy laser beam sweeps across the laser window 500 times per second at a rate of 150 m/s. As the user moves the CI-202 control unit down the pallet, an optical sensor records the motion along the specially textured aluminum rail. The onboard processing unit collects the data from each laser sweep and uses the optical sensor data to correctly accumulate the area and perimeter measurements. When the optical sensor detects that vertical motion has stopped, the laser subsystem stops taking measurements and the processing unit computes and posts the final results.

Specifications
  • Measuring Thickness: 15mm max.
  • Measuring Width: 150mm max.
  • Measuring Length: 36cm
  • Scanner: 675nm Laser Diode
  • Resolution: 0.025mm²
  • Accuracy: ±1% for samples >10cm²
  • Interface: USB 2.0
  • Memory Size: 8,000 measurements
  • Display: 16 characters ×2 lines LCD
  • Scanning Speed: 127mm/second
  • Battery: 7.2 volt rechargeable NiMH
  • Battery Capacity: 15 hours
  • Operating Temperature: 0 -50°C

Computing ratio/shape factor
Aspect ratio and shape factor information can be easily calculated
from the other information gathered. These derived quantities are calculated whenever necessary for the purposes
of display or data dumping. The calculations used are shown below.
Aspect ratio is the ratio of the leaf length to its maximum width. It can be calculated from the equation:
Where r is the aspect ratio,
Wm is the maximum width, and
l is the length
Shape factor is the ratio of the leaf area to the leaf perimeter, corrected so that the shape factor of a circle is equal to 1. It can be calculated from the equation:
Where f is the shape factor,
a is the area, and
p is the perimeter.