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THEORY OF OPERATION
Overview of the Parts of the Instrument
The CI-203 consists of a number of sub-systems. It has a laser width scanner that is capable of
measuring the width of an object in its objective 500 times a second to a resolution of 0.1 mm. It has a
roller length measuring system that can measure length steps of 1 mm. The entire instrument is
controlled by a microcomputer system that allows the user unparalleled flexibility in configuring the
instrument to make measurements accurately, easily and quickly.
The Width Scanner
When the instrument is in the scanning mode, a rotating mirror causes a laser beam to scan across the
objective 500 times a second. This beam is reflected off the special surface of the measuring arm and
received by a light sensor inside the unit. The level from this sensor is compared to a threshold. The
output of the "comparator" is fed to a counter, which is sampled at intervals during the width
scan. This count is used to calculate the width measurement for each scan.
The Length Step (Roller System)
The instrument includes a roller under the measurement arm that determines length
information. Each time the object being measured travels 1 mm, the computer is alerted, and
integrates the width and length scan information into the various parameters being measured.
Computing the Parameters
The CI-203 measures only two parameters directly: width and length. From these it derives area,
perimeter, aspect ratio, and shape factor from each scan.
Each time the meter senses the leaf has progressed 1 mm, the computer will check if the width
reading is a non-zero value.
If the width measurement is non-zero, the computer takes the following actions:
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.
1554 NE 3
Ave, Camas, WA 98607, USA
rd
Phone (360) 833-8835 Fax (360) 833-1914
sales@cid-inc.com http://www.cid-inc.com
CI-203 Instruction Manual rev. 8/9/2016
19
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