Plant Science Tools

CI-202

Portable Laser Leaf Area Meter


The CI-202 Portable Laser Area Meter uses advanced laser technology to provide researchers with a precise and convenient way to measure leaf area. The high-resolution laser scanner, data logger, and display are all enclosed in a durable, handheld scanner and detachable palette.
The CI-202 is used to perform non-destructive measurements on the leaves of living plants by placing the leaf on the palette and sliding the scanner over the leaf, enabling collection of data from the same plant, or even the same leaf, throughout its life span. The transparent, protective sheath on the palette makes it easy to capture precise leaf area measurement on tender or intricate leaves.

Theory Of Operation

The CI-202 measures length, width, area, and perimeter, and calculates ratio and shape factor once a measurement is completed.

Each time the control unit detects that the laser scanner has progressed 1 mm, the computer checks to see if the width reading is non-zero. If the width measurement is non-zero, the computer takes the following actions:

  • The length measurement is increased by 1 mm.
  • The width measurement is added to the area accumulator.
  • If the width measurement is greater than the currently stored maximum width, the maximum width is updated.

Aspect ratio is the ratio of the leaf length to its maximum width:

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:

Function

Features

  • Measures area, length, width, and perimeter and calculates shape factor and aspect ratio
  • Non-destructive and versatile
  • Flattens curled leaves to provide precise measurements
  • Resolution of 0.01 cm2
  • Simple, straight-forward operation
  • Stores up to 8,000 single measurements
  • Lightweight and self-contained instrument with built-in data logger and LCD display
  • Rechargeable internal battery
  • USB port transfers data to computer and charges the device
  • No calibration required
  • Includes communication software, operational manual, and hard shell carrying case

Specifications

Measuring Thickness: 1.5cm maximum

Measuring Width: 15cm maximum

Measuring Length: 36cm

Scanner: 670nm laser

Resolution: 0.01cm2

Accuracy: ±1% for samples >10cm²

Interface: USB 2.0

Memory Size: 8,000 measurements

Dimensions: 38.5L x 29W x 12.5H cm

Weight: 1,500g

Display: 16 characters x 2 lines LCD

Scanning Speed: 200mm/second

Battery: 7.2 volt rechargeable NiMH

Battery Capacity: Over 250 scans per charge

Operating Temperature: 0-50°C

How to Use it

To measure a leaf, lift the transparent film, place the leaf on the palette, place the transparent film over the leaf, and slide the laser scanner over the board. The CI-202 yields instant results for leaf area, length, width, perimeter, ratio, and shape factor measurements.

In the Box

The CI-202 Portable Laser Leaf Area Meter includes:

  • Palette style scan board
  • Laser scanner with built-in control unit
  • Battery charger
  • USB cable for data transfer
  • Communication software
  • One additional transparent film
  • Operating manual
  • Hard-shell instrument carrying case