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Calibrated Size Estimation Chart (Transparency)
Technical Association of the Pulp and Paper Industry (TAPPI), May 2009
Developed from and based on the Dirt Estimation Chart, this custom transparency is used to measure the size of spots, defects, or inclusions over the range of 0.02 to 5.00 square millimeters in paper and other industrial materials such as textiles or plastics. Instructions for use of this transparency are outlined in Test Method T 564. The chart can be used in a large number of applications where there is a need to estimate a size (area) by way of a direct comparison to a known area disk or rectangle. Applications may include, but are not limited to, the measurement of visible ink spatter on printed surfaces, the estimation of the growth rate of bio-colonies, air inclusions in transparent plastic castings and films, etc. The chart must NOT be used to estimate the equivalent black area (EBA) of dirt or other colored specks (use the TAPPI Dirt Estimation Chart in conjunction with T 213 or T 437 or use image analysis, T 563, for EBA measurement).
The charts are manufactured from an original negative produced on DuPont CRR film. A rapid-access processor using Kodak/Fujifilm chemistry is used for processing the transparencies. Each film positive is produced on Kodak Contact 2000 CA7 film, using a NuArc contacting frame with a NuArc light source and built-in integrators which control the exposure.
What makes a Calibrated Size Estimation Chart so special?
These charts are ideal for quality assurance processes that require more exact measurement.
Each chart has 23 dots that are calibrated using both a microscope and the industry measurement standard (NIST traceable reticule). It has been prepared with consistency and precision.
Each Calibrated SEC comes with its own data sheet that provides an actual dot measurement area (expressed in squared mm) to correspond with the increments (dots) on the chart.
Each Calibrated SEC is individually prepared and bears a tamper evident security hologram with its own serial number to assure authenticity to users.
What it can mean for you:
You no longer have to calibrate your own charts. You can save time and effort!
You can feel confident knowing that the each Calibrated Size Estimation Chart is prepared with care and precision to allow you to better serve your customers.
The quality assurance process is outlined below:
Calibrating the Microscope
A photomicrograph of NIST traceable reticule is taken under the appropriate lens (20x, 10x, or 5x) through a microscope. The distance on the image of the NIST traceable reticule is then measured in Photoshop. This is used to calculate a calibration factor for each lens.
Measurement of Dots
A photomicrograph of each dot on the chart is captured through the microscope without altering the lens configuration used for calibration. The horizontal and vertical diameters of the dots are measured in Photoshop. This data is then entered into a spreadsheet for analysis. The area is calculated from the measured data for each of the dots using the calibration factor calculated previously. This is completed for the following dot sizes (in square mm): .02, .03, .04, .05, .06, .07, .08, .09, .10, .15, .20, .25, .30, .40, .60, .80, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0.
Specification
The dots on the chart are correct within an average 10% or 0.005 square millimeters, whichever is the larger. A data sheet that includes the measurements of each dot will be provided to the customer along with the chart. This chart should be used in conjunction with TAPPI 564, NOT T213 or T437.
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