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#IP 1161 28 November - 4 December 2016

A brief report on CSIR NAL’s contribution towards the development of highly reflective mirrors of INSAT series of satellites of ISRO

INSAT class of satellites make use of sun shield mirrors for cooling the IR detector of very high resolution radiometer (VHRR). These sun shield panels are made of 6061 T651 aluminum alloy. The basic material is chosen for its light weight, high strength and easy machinability. These aluminum alloy surfaces are to be made as highly reflecting mirrors with stringent specifications such as specular reflectance >95% and diffuse reflectance < 0.05%. Aluminum cannot be polished to this specification as these alloys have very poor scratch resistance. The only solution to this problem is to engineer the surface with triplex layers. The surface modified layer should take up very high level of polishing (surface roughness < 5 nm). At CSIR NAL, this technology has been successfully accomplished. All the stringent specifications laid by ISRO have been met as evident from the table below. The first generation mirrors thus produced were successfully integrated in INSAT 2A, 2B, 2E, INSAT 3A and METSAT (Kalpana I).  Second generation mirror has also been developed on single point diamond turned aluminum panels with a roughness level of 2 nm. Complicated conical mirrors of LNA cooler assembly of EUTELSAT have also been successfully developed. This developmental work has resulted in huge foreign exchange savings and also self-reliance in strategic areas.




Total reflectivity

> 88%


Specular Reflectance Component

> 98%


Diffuse Reflectance Component

< 2%


Angular spread of diffuse component

< 20°

IR emittance

< 0.03


Surface roughness

2.0 nm

2.0 nm

INSAT 3 DR is the fifth satellite of INSAT 3 series that has been launched by GSLV-F05. It is basically a meteorological spacecraft with two main payloads as Imager and Sounder along with the DRT/SAS & R communication payload. Passive radiant coolers are used to cool and maintain the temperature of IR detectors for meteorological payload operation from 95K (BOL) and 100K (EOL) for effective cooling.The sun shields which were surface modified at Surface Engineering Division of CSIR NAL have been used in the recently launched INSAT 3DR (September 08, 2016). ISRO has sent an appreciation letter elucidating the satisfactory on-orbit performance of INSAT 3DR coolers.

#IP 1160 21 -27 November 2016

Congratulations !!!

Scientists from EAD, S Sudhakar, N Karthikeyan and S Ashwin Kumar, awarded the ‘Best Technical Paper’ for their work entitled ‘Experimental Investigation on the near flow field of dual stream nozzles’ at the 15th Asian Congress of Fluid Mechanics held at Sarawak, Malaysia on the 21st -23rd of November 2016.

#IP 1159 14 - 20 November 2016

CSIR'S TECHNO FEST KICKS OFF AT IITF-Aerospace & Strategic Sector Conclave by CSIR in IITF, PragatiMaidan

As the 36th India International Trade Fair (IITF), 2016 kicked off on Monday with the inauguration by the President Shri Pranab Mukherjee, the Council of Scientific and Industrial Research took off its exhibition at Pragati Maidan. Minister of Science and Technology and Earth Sciences, Dr. Harsh Vardhan inaugurated the ‘CSIR Platinum Jubilee Techno Fest’ inside the Hall No 12-A at Pragati Maidan.

CSIR'S TECHNO FEST KICKS OFF AT IITF-Aerospace & Strategic Sector Conclave by CSIR in IITF, PragatiMaidan | Day 1 & Day 2

Aerospace & Strategic Sector Conclave by CSIR in IITF, Pragati Maidan | Day 1 Video | Day 2 Video

#IP 1158 7 - 13 November 2016


NAL-ARES consortium gets order from AMC College of Engineering, Bengaluru for wind solar hybrid system.

Best Poster Award - The technical paper entitled “FSI and Modal Analysis of Elastic Ring Squeeze Film Damper for Small Gas Turbine Engines” authored by Thennavarjan Subramanian, Dr Jeyaraj P, Manikandan L P, S S Kulkarni, Dr Soumendu Jana, Propulsion Division won Popular Choice Best Poster Award at COMSOL Multiphysics Conference 2016, Bengaluru.



TEAM NAL wishes our colleague a very happy, healthy and productive life after superannuation on 31 October 2016.

Mr Narasimha Rao K, ADK


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