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Cleaning Information
How to clean metal filters or attenuator gratings
E.17 How to clean metal filters or attenuator
gratings
This kind of device is extremely fragile. A misalignment of the
grating leads to inaccurate measurements. Never touch the surface
of the metal filter or attenuator grating. Be very careful when using
or cleaning these devices. Do not use cotton-swabs or soft-tissues,
as there is the danger that you cannot remove the lint and that the
device will be destroyed by becoming mechanically distorted.
Preferred Procedure
Use the following procedure on most occasions.
1. Use compressed air at a distance and with low pressure to
remove any dust or lint.
Procedure for Stubborn Dirt
Do not use an ultrasonic bath as this can damage your device.
Use this procedure particularly when there is greasy dirt on the
device:
1. Put the optical device into a bath of isopropyl alcohol, and wait
at least 10 minutes.
2. Remove the fluid using compressed air at some distance and
with low pressure. If there are any streaks or drying stains on the
surface, repeat the whole cleaning procedure.
E.18 Additional Cleaning Information
The following cleaning procedures may be used with other optical
equipment: