DTI2


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DTI3

Description

This compact digital phase-shifting interferometer is designed for rapid workshop and laboratory measurements. It contains innovative technical solutions, which allow increasing stability and accuracy. The interferometer can be direct connected to an Ethernet network, has no restrictions on cable length, and can be used from different workplaces. The free software contains a set of scripts for the interferogramm analysis and the graphic user interface for visualization of results. This software can be used as for laboratory measurements, as for embedding into automatic control systems.

Interferometer

The interferometer is build on the basis of high- quality optical and electronic components, has integrated high resolution digital image sensor synchronized with a phase-shifting element. The interferometer has integrated coherent laser source and reference flat. For control and data transfer Fast Ethernet interface is used. Built-in HTTP server provides fast tunning and testing, is compatible with all popular Web browsers. Also the interferometer has two USB-Host interfaces. It allows connecting auxiliary devices (X-Y or rotation tables, attenuators, zoom- objectives, etc.) for expanding of functional capabilities and creating complete automatic system.

Features

Fizeau layout
Integrated semiconductor laser and reference flat
Build-in phase calculation algorithm
Power over Ethernet (PoE) Technology (single supply 48V)
Typical power consumption 2.5W

Interfaces

1x 10/100Mb Fast Ethernet
2x USB-Host

Common specifications

Specification	Value
Control and power connector (Ethernet)	RJ-45
Aperture size	40 mm
Reference flat surface quality	λ/10
Camera resolution	512x512, 1024x1024
Type	Mono
Digitization	8 bits
Digital zoom range at resolution 512x512	x1, x1.5, x2, x3, x4
Data acquisition time at preview resolution*	<2 sec
Data acquisition time at full resolution*	<5 sec
Live video rate at preview resolution**	>10 fps
Laser wavelength	532nm or 635nm, not stabilized
Laser safety class	3R
Typical power dissipation	2.5W
Dimension without connectors	520x140x140
Operating temperature range	15 to 35°C
Relative humidity	10 to 95%, non condensing

* Frames capture time + phase map calculation time
** Depends on computer performance

Software

Libraries

Open-source, platform independent, socket based library for control and image capture. Can be used with most popular programming languages (C, C#, Python, Matlab, etc.).

Free Analysis Software

The interferogram analysis software uses scripting programming language Python. It extends Python with C control and mathematical modules, provides fast data acquisition and short OPD calculation time. Scripts allow capture images from an interferometer, recover a phase map, calculate an optical path difference (surface relief) and analyze it (Peak to Valley, RMS, Zernike coefficients). Scripts are very flexible can be easy adapted for the specific features of a test object.

Free GUI

The graphic user interface for Windows and Linux can be used together with interferogram analysis package. GUI uses icons for quick access to frequently used functions, allows users to start measurements and calculation scripts with button click, visualize and save obtained results. It can also be helpful for checking or tuning interferometer before starting of automatic processing.