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Đo diện tích lá bằng laser CI-203

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The CI-203 Handheld Laser Area Meter uses advanced laser technology to enable researchers a precise and convenient way to measure leaf area (or the areas of leaf-like objects). The CI-203 has been upgraded to offer a host of new features that will augment data sets and make collection quicker and easier. Through new technology, measurement consistency and repeatability has been vastly improved.

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  • Nhà Sản Xuât
  • CID Bio-Sciencie

    The CI-203 is, without question, the best leaf area meter in the market. We have also improved the instruments ability to accurately measure delicate leaves, including a feature that allows the researcher to see an image after each measurement to insure a successful scan. Built-in GPS tagging adds a location for each data set and the removable SD card provides an easy and fast way to download data to your computer.

    The high-resolution laser scanner, data logger, and display are all enclosed in a single, handheld wand unit weighing 910g. Researchers can perform non-destructive measurements on leaves of living plants by simply pulling a leaf through the instrument, enabling collection of data from the same plant, or even the same leaf, throughout its life span. For rapid measurement of detached leaves, the CI-203CA, conveyor attachment makes a perfect complement to the CI-203.

    In addition to the conveyor attachment, the CI-203 also has an optional attachment, CI-203RL for measuring the area of roots and other irregularly-shaped matter. All six measurement parameters (area, width, length, perimeter, shape factor, and aspect ratio) comprise a data set and are compiled at the same time, and over 15,000 data points can be stored and transferred to a computer or printer.

    • Graphic display and rendering of leaf images for verification of a successful scan and auditing of data
    • Built in GPS tagging to provide location data for each measurement
    • Non-destructive measurements
    • No calibration required
    • One-Touch Data: Simply sweep the CI-203 over a leaf to yield six measurement parameters: area, width, length, perimeter, shape factor, and aspect ratio
    • Durable and lightweight
    • Improved consistency of measurements

    Features

    • One-Touch Data: Simply sweep the CI-203 over a leaf to yield six measurement parameters: area, width, length, perimeter, shape factor, and aspect ratio
    • Durable and lightweight
    • Improved consistency of measurements
    • Improved handling of delicate leaves
    • Graphic display and rendering of leaf images for verification of a successful scan and auditing of data
    • Built in GPS tagging to provide location data for each measurement
    • SD Card for data storage
    • Standard USB charging and data download
    • Ideal for field work and very easy to use
    • Non-destructive measurements
    • No calibration required
    • Rechargeable battery
    • Measures objects up to 150mm (254mm with conveyor) wide and 25mm thick of virtually unlimited length
    • Conveyor Attachment (CI-203CA) is available for fast measurement in the field or lab
    • Root Length Measurement Attachment (CI-203RL) is available

    Specifications

    • Measuring Thickness: 25mm maximum
    • Measuring Width: 150mm maximum
    • Measuring Length: 3m maximum
    • Resolution: .01cm²
    • Accuracy: ± 1% for samples >10cm²
    • Interface: USB serial interface
    • Measuring Units: cm² (area), cm (length, width, and perimeter)
    • Memory Size: 32k bytes, 15,000 readings
    • Display: 16 characters × 2 lines LCD
    • Scanning Speed: 200mm/second
    • Battery: 7.2 volt rechargeable NiMH
    • Battery Capacity: Over 15 hours of normal use
    • Operating Temperature: 0 - 50° C
    • Dimensions: 35.5L × 4.5W × 5Hcm
    • Weight: 910g

    Theory Of Operation

    The CI-203 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 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-203 wand down the leaf, an optical sensor records the motion, and the onboard processing unit collects the data. Each laser sweep 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.

    The perimeter increment is calculated and added to the perimeter accumulator. The perimeter increment is calculated using the function:

    Computing Ratio and 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:

     

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