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Fixtures and Accessories

Bristol Instruments offers various accessories for its Thickness Gauge systems. These accessories can be used to simplify the thickness measurement process.

5-Axis Fixture

For optimal instrument performance, it is important that the material under test is normal to the axis of the beam emitted by the optical probe. The 5-Axis Fixture includes two angular adjustments that are used to precisely align the optical probe to your part. In addition, the 5-Axis Fixture provides an easy way to position your part under the optical probe using its X, Y, and Z linear stages.


Group Index Measuring Cell

The Thickness Gauge systems from Bristol Instruments measure, what is known as, optical thickness. To convert this measurement to an actual physical thickness, it is necessary to know the Group Refractive Index value of the material under test.

The system's Opti-Cal™ software includes an expansive library of Group Index values for many common types of glass and plastics. If the Group Index value of your material is not included, or is not known, it can be determined by using the Group Index Measuring Cell.

For more information on Group Index, why it is important, and how the Group Index Measuring Cell functions, please see the following Technical Note.


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