P10541: Micro-gloss Measurement System Improvements
/public/

Current Device Measurement Procedures

Making a Gloss Measurement

Before first measurement

  1. Load SPOT advanced and start the live view
  2. Rotate the polarizing lens to 90 degrees
  3. Position the tube (assuming that it has moved since the last measurement) so that the green light shows up as a vertical bar in the live view
  4. Position the reference sample on the tube so that it takes up the entire live view frame and secure it
  5. Adjust the exposure time and gain so that the image histogram shows as little empty space as possible along the X axis
  6. Capture the image by clicking File -> Save as...
    • Be sure to append a "B" to the image file name so you know this is the "bright" image
  7. Rotate the polarizing lens to 0 degrees
  8. Capture the image by clicking File -> Save as...
    • Be sure to append a "D" to the image file name so you know this is the "dark" image
  9. Load ImageJ and run the RIT plugin
  10. Use the "Browse" buttons to find the bright and dark image files
  11. Change the reference area to 1
  12. Change the image center to the value noted from before
  13. Change the left and right bases to -80 and 80, respectively
  14. Click "Run" at the top
  15. Try to find the place on the bell curve shown where the curve starts to move back up and adjust the left and right bases to those degree values
  16. Click "Run" again
  17. Repeat the last two steps until the bell curve is always descending as it goes out
  18. Change the reference area to the "Area" value from the output vector
  19. You are now ready to measure another sample

Measuring a non-reference sample

  1. Load SPOT advanced and start the live view
  2. Rotate the polarizing lens to 90 degrees
  3. Position the sample on the tube so that it takes up as much as the live view frame as possible and secure it
  4. Adjust the exposure time and gain so that the image histogram shows as little empty space as possible along the X axis
  5. Capture the image by clicking File -> Save as...
    • Be sure to append a "B" to the image file name so you know this is the "bright" image
  6. Rotate the polarizing lens to 0 degrees
  7. Capture the image by clicking File -> Save as...
    • Be sure to append a "D" to the image file name so you know this is the "dark" image
  8. Load ImageJ and run the RIT plugin
  9. Use the "Browse" buttons to find the bright and dark image files
  10. The reference area and image center should be the same as they were when you finished measuring the reference sample
  11. Change the left and right bases to -80 and 80, respectively
  12. Click "Run" at the top
  13. Try to find the place on the bell curve shown where the curve starts to move back up and adjust the left and right bases to those degree values
  14. Click "Run" again
  15. Repeat the last two steps until the bell curve is always descending as it goes out
  16. You may now record the glossiness data from the output vector, save the ball curve in list form, or screen shot the bell curve