The A.V.Luikov Institute of Heat and Mass Transfer of the NAS of Belarus offers consumers a two-mirror autocollimation interferometer with visualization of the refractive field under a manufacturing agreement, is looking for partners to conclude a distribution services agreement is looking for partners to conclude a distribution services agreement.

Two-mirror autocollimating interferometers are used for high-precision angle measurements, flatness testing, and other optical parameters in scientific research and industry. These devices find application in the optical, mechanical, and instrument-making industries. Several leading manufacturers of these interferometers are present on the global market.

Major global manufacturers of two-mirror autocollimating interferometers:

1. Zygo Corporation (USA)
- Features: Zygo is a world leader in the production of interferometric equipment, including autocollimating interferometers for high-precision measurements.
2. Mahr GmbH (Germany)
- Features: Mahr offers a wide range of metrology equipment, including interferometers for angle and flatness testing.
3. Renishaw (UK)
- Features: Renishaw produces high-precision interferometric systems used in scientific and industrial applications.

A.V.Luikov Institute of Heat and Mass Transfer has developed a two-mirror autocollimation interferometer designed to visualize optical inhomogeneities in media that are transparent to the visible region of the spectrum and to quantify the spatial refraction field in the objects under study.

The device is built according to the scheme of a two-beam interferometer. It uses a helium neon laser as the light source. The optical expander converts the laser radiation into a parallel beam. After the expander, a nozzle with a flat wedge shaped plate is installed, the last surface of which is the reference plane. The controlled part is fixed in a special frame, while the controlled the reference surface is set in such a way that the autocollimation path of the rays in the interferometer is provided. The beam of electromagnetic radiation with the help of a controlled plate is spatially divided into two coherent beams, which interfere with each other. The first beam is formed after reflection from the reference surface, the second - after passing through the controlled plate.

Surface shape control is based on the analysis of the interference pattern. To automate measurements on the device, a special electronic control unit is used, which implements the phase step method for automatic interpretation of interferograms. The analysis of interference patterns and the determination on its basis of the parameters of the shape of the controlled surface or the wave front reflected from it is performed using a special program using a PC.

Technical characteristics:

field of view diameter	200 mm
collimating lens focal length	595 mm
interference fringe run across the field	no more than 0.1
operating wavelength range of the light source	500–700 nm
collimator block dimensions	767х228х235 mm3
mirror block dimensions	485х228х265 mm3
total weight	40 kg

Research area: 
The Institute offers partners:
* two-mirror autocollimation interferometer with visualization of the refractive fieldunder under a manufacturing agreement;
* two-mirror autocollimation interferometer with visualization of the refractive fieldunder under a distribution services agreement.

Read more. Catalog "Actual Developments, Research, Measurements, and Testing" 2022, pp. 73-74.(in Russian)

All components of the interferometer are located along the same optical axis, which greatly simplifies its layout on the experimental setup arbitrary geometry.

The interferometer, with small dimensions and weight, has a relatively large visualization field.

Interferometer mirrors in adjustable frames are made in the form of removable nodes, which makes it possible to install them on separate raters and change the length of the measuring arm of the interferometer in a wide range.

When studying processes in closed chambers, the placement of mirrors interferometer inside the chamber automatically excludes the influence of optical inhomogeneities of the viewing window of the camera to shifts in the interference fringes.

Industrial analogue "Interferometer IZK-454" with a field size visualization 140x215 mm has a weight of about 2000 kg.

Various processes have been studied:
- laser radiation with solid targets (D=40 mm);
- glow discharge of atmospheric pressure (D=40 mm);
- Dynamics of a flame of a gas-flame torch (D=60 mm);
- valve gas inlet into the vacuum chamber of the QSPU P-12x2 quasi-stationary plasma accelerator (D=80 mm);
- formation of a compression area in a magnetoplasma compressor (D=100 mm);
- outflow of plasma flow from the discharge device KSPU P-50M (D=200 mm).

The A.V. Lykov Institute of Heat and Mass Transfer of the National Academy of Sciences of Belarus is the country's largest scientific institution, focusing on fundamental and applied problems of heat and mass transfer, fluid dynamics, energy, thermal engineering, chemical physics, combustion and explosion physics, and nanotechnology. It also develops energy-efficient and environmentally friendly technologies and equipment, as well as apparatus and instruments for power engineering and mechanical engineering, the agro-industrial complex and construction industries, medicine, the chemical, electronics, radio engineering, food, and space industries.

Main areas of scientific and technical activity:
- heat and mass transfer processes in capillary-porous bodies, dispersed systems, rheological and turbulent media, nonequilibrium flows, low-temperature plasma, and radiation-matter interactions;
- dynamics, transport, and elementary processes in systems with chemical and phase transformations;
- Physical kinetics, heat transfer, and transport processes at the micro- and nanoscale;
- Energy-efficient heat and mass transfer technologies, equipment, and apparatus;
- Transport processes, heat transfer in biological systems and complex molecules;
- Physical and structural properties of substances, materials, and surfaces under internal structuring and extreme conditions;
- Mechanics of fluids, gases, and plasma;
- Mechanics and rheology of viscoelastic media under shear, temperature, and electromagnetic influences;
- Numerical methods and software packages for the numerical modeling of physicochemical and heat transfer processes;
- Catalytic technologies and equipment for producing hydrogen, synthesis, endo-, and exo-gases, synthetic and composite fuels;
- Technologies and equipment for producing nano- and microstructures and materials;
- Plasma, plasma-chemical, and chemical methods of waste purification and disposal.

The Institute organizes:
Minsk International Forum on Heat and Mass Transfer;
International Conference "Heat Pipes, Heat Pumps, Refrigerators, and New Energy Sources";
International Conference "Methodological Aspects of Scanning Probe Microscopy";
Minsk International Colloquium on the Physics of Shock Waves, Combustion, and Detonation;

The Institute hosts the editorial board of the Engineering Physics Journal, which is republished in English by Springer.

The Institute maintains scientific, scientific-organizational, and scientific-industrial cooperation with academic and industry research institutes, universities, design bureaus, associations, and enterprises in Belarus, Russia, Ukraine, Kazakhstan, Moldova, Uzbekistan, Lithuania, Latvia, China, the USA, India, Germany, Poland, the Czech Republic, Israel, Brazil, Italy, France, and other countries.

Official website of the A.V. Lykov Institute of Heat and Mass Transfer.

Customers interested in purchasing a two-mirror autocollimation interferometer with visualization of the refractive field under a manufacturing agreement.

Partners interested in purchasing a two-mirror autocollimation interferometer with visualization of the refractive field under a distribution services agreement.