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Interferometer "OPTOTL-ICO - 60"
Production Interferometer “OPTOTL-ICO – 60” is designed in
Opto-Technological Laboratory to be used in optical shops and laboratories that
specialize in optical manufacturing, assembly, and testing. It is suitable for
the testing of polished flats and spherical surfaces next to machines in optical
production shops. This workshop interferometer can be installed in any suitable
optics polishing area and can be attached to different optical schemes: standard
transmission spheres, compensator for aspherical surfaces, adaptive mirrors, etc.
The main part of production interferometer is a special compact
interferometric unit (approximately 80 mm Dia and 250 mm length), which is
attached to the standard transmission spheres of the interferometer.
The design is based on Fizeau schematic. Furthermore, new additional
measuring concepts, for which patents are pending, are used.
Original FastInterf software is used, which was specifically
designed to simplify the measuring procedure, reduce data rendering time, and
make the input/output interfaces more user-friendly.
The following are the main advantages of the Interferometer:
- Its small size makes possible the placement of the Interferometer in very busy optical shops with lots of foot traffic;
- Its simplicity and user-friendly software allows the optician to master the operating procedure quickly;
- The big field of view of its adjusting channel and an additional adjusting channel monitor reduce and simplify the adjustment procedure;
- Its module concept allows the user to reconfigure the Interferometer quickly and simply eliminating need to purchase additional interferometers.
The Interferometer consists of:
- main opto-mechanical unit
- two monitors for adjusting and visualizing the interferometric picture
- transmission spheres set
- computer with software
Technical Characteristics
The main unit:
- Collimator beam diameter, mm .....................60
- Main unit dimensions (without illumination part), mm
Diameter ...................................................80
Length.......................................................250
- Light source ....................................He-Ne laser or DPSS
- Zoom range - 3X
- Wide range of manual focusing to exclude a diffraction affect
- Vertical arrangement -- "transmission sphere above - component under testing below"
- Measurement of transmittive wavefront errors of lens assemblies
Monitors:
- Separate monitor for adjusting channel
- Monitor for visualization of interferometric picture*
* presence of two nearby monitors considerably simplifies adjusting procedure.
Transmission spheres set characteristics:
- standard transmission spheres set , pcs .........................16
- transmission sphere quality…............................Lambda/10*
- F# range ………………………….....................1:0.8 - +/-1:15
- tested surface radii range, mm .....................1000CC -900CX
- possibility of range of tested surface radii increasing by using additional transmission spheres
* tested with Zygo GPI interferometer transmission sphere quality Lambda/20
Software:
- Calculation of all standard errors corresponding to optical surface and transmission wavefront condition level:
- (P-V) error;
- (RMS) error
- defocus (power)
- 3rd order aberrations
- Zernike polynomial coefficients
- results can be presented in various forms, including 3D surface topography
- generates interferometric picture for visual authenticity of errors
The trade name of workshop Interferometer ICO (Interferometer Comes to
Optician) highlights a major feature of the Interferometer. This production
interferometer is specifically designed for precision surfaces measurements in
busy optical shops and labs with high turnaround cycles. In such shops,
opticians typically have limited access to interferometers because owners of
optical shops are often reluctant to invest the significant sums required to
purchase such devices. The lack of interferometers significantly increases the
lead time and final cost of products.
Our experience shows that for small and medium size optical shops it is possible to provide measurements (without interfering with polishing) with just three interferometers. And it is not necessary to purchase three complete sets of interferometers.
It is enough to have:
- three main units
- one computer with software
- one set of transmission spheres
Although multiple users cannot work with one software at the same time, this limitation will not slow down the manufacturing process because the adjustment -- which takes the most time -- is accomplished at the main units, which are equipped with their own monitors that can fix and observe interference pictures.
To meet specific customer needs, our experts will continue to upgrade and modernize the interferometer for a small additional charge.
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