Absolute Metrology Services

Optical Testing Services

With AMS optical testing and interferometry services, your samples will be measured accurately by an expert optical metrologist with over 20 years of experience. AMS uses the latest ZYGO interferometers, including the VeriFire™MST for general surface form and transmitted wavefront error, the VeriFire™ATZ with ZMI™ for spherical radius of curvature, and the NewView™7300 for surface roughness, surface texture, and form of non-specular samples. Browse our offerings below, or contact AMS to discuss your specific testing needs.

Don’t see your testing requirement listed? Contact AMS to inquire.

Large Aperture Interferometry – VeriFire™MST, VeriFire™ATZ

Send your samples to AMS, and we will test them for overall form, radius of curvature, transmitted wavefront error, or other relevant specifications. AMS can discuss your application and target the testing to fulfill your requirements. If there is a potential metrology issue at the supplier, AMS can review your manufacturer's optical testing practices and provide appropriate training.

General flat or spherical surface quality measurements are performed on the VeriFire™ MST interferometer. Its wavelength-shifting capability enables measurements that standard phase-shifting interferometers cannot perform.

Spherical parts requiring radius of curvature are performed using the VeriFire™ATZ interferometer paired with the ZMI™ distance measuring interferometer.

1K x 1K cameras are used with a choice of 33mm, 4”, 6”, and 12” apertures; contact us if you have a sample that is larger.

Contact AMS today to discuss your large aperture optical testing needs.

Microscopic Interferometry – NewView™7300

AMS uses the NewView™ interferometer to test samples, most often for roughness, waviness, and other small-scale qualities. Both rigid and slightly pliable materials can be tested.

In addition, the NewView™ is capable of testing overall form on samples which cannot be tested using large aperture. We are capable of ‘stitching’ individual fields of view to enable form testing on larger samples.

Contact AMS today to discuss your microscopic testing needs.

Optical Certification Services - VeriFire™MST

Large aperture optical testing requires a high quality reference optic, either a Transmission Flat (TF) or Transmission Sphere (TS). Certification services ensure that this reference is still within its stated specification. Certifications are required to be performed at regular intervals to satisfy ISO 9001 quality standards. AMS’ absolute testing methods are fully traceable, satisfying ISO 17025 standards as well.

Knowing the reference quality gives the engineer an idea of the measurement limitations when using the reference in a relative test. If the part specification is tight, the part measurement may require that the reference error be subtracted from the measurement.

Certifications on a reference optic of 1/20th wave PV are accurate to 1/300th wave or better. Certificates state the measured PV and related uncertainty. A surface map of the optic is provided with every certificate.

Quantities we can certify include flatness, spherical form, and spherical radius of curvature.

Contact AMS today to discuss your absolute testing and optical certification needs.

Data Processing using MetroPro^® Software

Perhaps you own an interferometer and have a repetitive procedure that your employees have to carry out hundreds of times per day, such as quickly generating screen shots for a set of measured parts or analyzing multiple subapertures on many parts. Some companies find that they need to satisfy a specification whose result is not available in MetroPro. These are just a few of the examples of how AMS has helped previous customers operate more efficiently.

Contact AMS today to discuss your data processing needs.

Additional Testing Services

If you have a testing need that is not listed in this table, or does not use an interferometer, contact AMS to inquire.