Purpose

This process ensures the coating displays the correct characteristics.

Scope

This document covers spectral testing done on a lens from any customer.

Definitions

• Spectral: Way to measure and analyze the optical characteristics of a coating.

Responsibilities

• Lens Tester: Person responsible for performing all aspects of lens testing after the lenses have been delivered by receiving.

Materials and Equipment

• F10 AR Unit
• Probe
• BK Reflectance Standard

Procedures

Calibration

1. Turn on power to the Filmetrics unit. Unit must be on for at least 5 minutes before a reading can be taken. (Figure 1)
2. Open Filmetrics software and select AR mode. (Figure 3)
3. Click the “Baseline” button. (Figure 3.2)
4. Follow the on-screen prompts.
5. Move the contact probe at an angle keeping one side of the contact probe in contact with the BK7. (Figure 2.1)
6. Press “OK” on the Filmetrics program.
7. Place contact probe on the BK7, and press measure on the main screen. (Figure 7)
8. At 500 nm, the line should be between 4.1% and 4.3%.
9. If you have a reading other than this, repeat the baseline process.

Measuring a Coating

1. On the right side of the screen, select the recipe dropdown button and then select the recipe that you will be measuring. (Figure 5.1)
2. Adjust the reflectance maximum to accommodate what you are coating you and you are measuring. (Figure 4)
   1. Double click on the graph field.
   2. Adjust the upper left field to the appropriate maximum.
3. Ensure that both the “Measurement Status” and “Measurement Results” are expanded.
4. Place the lens to be measured on the black felt cloth (Figure 2)
5. Press the probe down firmly in the center of the lens.
6. Click the “Start Measure” button on the right hand side of the screen. (Figure 2.1)
7. Verify that the “Measurement Status” box says “GOOD” and is green. (Figure 8)
8. If the “Measurement Staus” box says “BAD,” the coating is out of spec. (Figure 6)

Measuring Hardcoat Thickness

1. Select “Hardcoat Mode.” (Figure 4.4)
2. Place probe on lens.
3. Select “Start Measure.”
4. Hardcoat thickness measurement will appear in the “Measurement Status” box. (Figure 4.3)

Saving Spectral File

Save all spectral files for customers in the customer folder on teh Y: drive by selecting the save icon in the top left corner (Figure 4.2) and saving the files to the following file location:

Y: > Technical Support Team > Test Lab > Results > Customer Tests > Select Customer > Select correct year > Name the file what the lens is labeled