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Optical
flats in Float glassAn
optical flat is a disk in glass with one or both surfaces precisely polished.
It is used as a reference for the control of the planarity of other unknown surfaces.
When an optical flat and a work surface are placed in contact, an air wedge is
formed. Areas between the flat and the work surface that are not in contact form
this air wedge. If the surfaces are perfectly plane, you can see parallel lines.
| Description | Code
LOBRE
single surface
optical flat | Code LOBRE
dual surface
optical flat
| "m" n.
max of
interference fringe | | D=20mm
sp. 8/12mm | PI1020.001 | PI2020.001 | 2
(0.6µm) | | D=50mm
sp. 8/12mm | PI1050.001 | PI2050.001 | 3
(0.9µm) | | D=80mm
sp. 12/15mm | PI1080.001 | PI2080.001 | 4
(1.2µm) | | D=120mm
sp. 15mm | PI1120.001 | PI2120.001 | 4
(1.2µm) | | D=150mm
sp. 25mm | PI1150.001 | PI2150.001 | 4
(1.2µm) | | D=180mm
sp. 25mm | PI1180.001 | PI2180.001 | 5
(1.5µm) | | D=200mm
sp. 25mm | PI1200.001 | PI2200.001 | 5
(1.5µm) | | D=300mm
sp. 30mm | PI1300.001 | PI2300.001 | 7
(2.1µm) | | D=350mm
sp. 30mm | PI1350.001
| PI2350.001 | 8
(2.4µm) | | |
