DTI2


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DTI2

Description

This compact and easy integrable digital phase-shifting interferometer is developed specially for creation of cost-effective optical quality control systems. It ideally suited for applications with limited space and power consumption. The interferometer can measure plane, spherical and some aspheric surfaces, contains innovative technical solutions, which allow increasing stability and accuracy of measurements. The interferometer can be named as "network interferometer". It connects direct 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 works with external coherent laser source, connected via fiber coupler. It makes possibility to select laser with desired wavelength and stability. 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 RS485 interface. 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

Build-in phase calculation algorithm
Power over Ethernet (PoE) Technology (single supply 48V)
Typical power consumption 2.5W
FC/PC fiber coupler for external coherent laser source
Can be adjusted for 400...700nm wavelength

Interfaces

1x 10/100Mb Fast Ethernet
1x RS485 (expansion serial interface)

Common specifications

Specification	Value
Control and power connector (Ethernet)	RJ-45
Expansion Connector (RS485)	RJ-11
Typical power dissipation	2.5W
Camera resolution	512x512, 1024x1024
Type	Mono
Digitization	8, 10 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

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

Application examples

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.

DTI2-OEM

Features

Can be adjusted for 400...700 nm wave length
Compatible with popular 30mm optical cage systems.

Specifications

Specification	Value
Dimension without connectors	145x75x40
Aperture size	5 mm
Optical components quality	λ/10
Operating temperature range	15 to 35°C

Other specifications see here

DTI2-OEM2

Features

Can be adjusted for 400...700 nm wave length
Compatible with popular 30mm optical cage systems.

Specifications

Specification	Value
Dimension without connectors	115x105x40
Aperture size	5 mm
Optical components quality	λ/10
Operating temperature range	15 to 35°C

Other specifications see here

DTI2-5

Features

Can be adjusted for 400...700 nm wave length
Can be used as laboratory quality control interferometer

Specifications

Specification	Value
Dimension without connectors	160x110x125
Aperture size	5 mm
Optical components quality	λ/10
RMS Repeatability*	λ/10000
Operating temperature range	15 to 35°C

* Repeatability is for 100 sequential measurements of the same surface. Depends on laser quality
Other specifications see here

DTI2-20

Features

Can be adjusted for 400...700 nm wave length
Can be used as laboratory quality control interferometer

Specifications

Specification	Value
Dimension without connectors	160x110x125
Aperture size	up to 20 mm
Optical components quality	λ/10
RMS Repeatability*	λ/10000
Operating temperature range	15 to 35°C

* Repeatability is for 100 sequential measurements of the same surface. Depends on laser quality
Other specifications see here

DTI2-CASE

Features

Mobile laboratory quality control set
Complete Solution for testing of flat surface optical components
Contains interferometer DTI2-5 or DTI2-20, Solid-state Laser and Netbook with preinstalled software

Specifications

Specification	Value
Case dimensions	320x250x170
Aperture size	5 or 20 mm
Laser wavelength	635nm, not stabilized
Laser safety class	3R
Computer	ASUS Eee PC
Operating temperature range	15 to 35°C
Relative humidity	5 to 95%, non condensing

Other specifications see here