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Defining the "Scope" of the wavefront standard.
What issues should be considered as well as neglected when defining the scope for
creating a wavefront standard? The first necessary step on the path to an adopted
wavefront standard is a scope statement that will act as a guideline for setting the
Issues to be considered or neglected when writing the wavefront standard. This is a list
of issues that were raised at the June 25
meeting in Boulder.
Managing the calibration of the measuring instrument
Management of the uncertainty
Focusing of the interferometer
PSD; yes or No
Specific types of errors to be defined
Definitions of error types
RMS of the slope and it's measure of the point spread function(PSF)
Environmental effects (temperature, pressure, humidity, vibration etc. etc.)
Polarization effects on the measurement
Noise sources that degrade the integrity of the measurement.
Aperture shape and size
The goal for the task force is to produce a practical, concise, and understandable
wavefront standard that will be adopted by the US optics community. It is not the team's
intent to produce a standard that will catch all possible wavefront measurement
applications, but rather to address the mainstream needs of the optics community. It is the
intent of the task force to produce a unified document that can serve as a standard for
communicating and articulating basic wavefront requirements and measurement
The ISO 10110-5 and 10110-14 standards on form and wavefront serve as a good starting
point to creating a United States standard. These two documents should be referenced as
well as modified, where appropriate, when arriving at the final content contained in the
US standard.
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Current "Scope" for ISO 10110-5 and 10110-14
Surface Form Tolerances
ISO 10110 specifies the presentation of design and functional requiements for optical
elements and systems in technical drawings used for manufacturing and inspection
This part of ISO 10110 specifies rules for indicating the tolerance for surface form.
Note 1:
The terminology of interferometry is used for the specification of tolerances, and in particular,
for the units in which the tolerances are to be specifies; however, this does not stipulate that only
interferometric methods may be used for the actual testing of optical parts. Other, non-interferometric
methods may be used if the results are converted to the units specified here.
This part of ISO 10110 applies to surfaces of both spherical and aspheric form.
Note 2:
ISO 10110-12 allows the surface form tolerance for aspheric surfaces to be specified without
reference to this part of ISO 10110.
Wavefront Deformation Tolerance
International Standard ISO 10110 applies to the presentation of design and functional
requirements for optical elements and assemblies in technical drawings used for
manufacturing and inspection.
This part of ISO 10110 gives rules for the indication of the allowable deformation of a
wavefront transmitted through - or, in the case of reflective optics, reflected from an
optical element or assembly.
The deformation of the wavefront refers to its departure from the desired shape. The
tilt of the wavefront with respect to a given reference surface is excluded from the
scope of this part of ISO 10110.
There is no requirement that a tolerance for transmitted wavefront deformation be
indicated. If such a tolerance is specified, it does not take precedence over a tolerance
for the surface form according to ISO 10110-5. If tolerances for both the surface form
and the transmitted wavefront deformation are given, they must both be upheld.