Optics

Wavelength Tech Forum: Optics & Lasers

Optics and Lasers Wavelength

The authors describe an in-situ cleaning verification technique that promises to be faster and more efficient than traditional methods, which use swab sampling followed by HPLC analysis. The technique is based upon FT-IR spectroscopy in the middle-infrared (mid-IR) range using reflection at a grazing angle.

The author provides a brief historical and technological review of different types of telescopes, and how they were developed and improved.

A fiber-optic, mid-IR spectroscopy probe combined with a grazing-angle reflectance sampling head can be used as a solvent-free, in situ method for validating cleanliness with substantial improvement in accuracy, compared with traditional methods.