A5047620080- Adaptive optics and wavefront sensing
- Advanced optical system design
- Advanced Measurement and Metrology Techniques
- Optical Systems and Laser Technology
- Optical measurement and interference techniques
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Advanced Surface Polishing Techniques
- Optical Wireless Communication Technologies
- Mechanical Engineering and Vibrations Research
- Agricultural Economics and Practices
- Solar and Space Plasma Dynamics
- Indian Economic and Social Development
- Indian History and Philosophy
- Stellar, planetary, and galactic studies
- Photocathodes and Microchannel Plates
- Laser and Thermal Forming Techniques
- Laser Material Processing Techniques
- Iterative Learning Control Systems
- Emotional Intelligence and Performance
- Inertial Sensor and Navigation
- Non-Destructive Testing Techniques
Indian Institute of Astrophysics
2016-2024
The Segmented Mirror Telescopes (SMT) are built using small hexagonal mirror segments placed side by to form a monolithic primary of very large size. effective figure such segmented is maintained against external disturbances introduced gravity, temperature, wind and vibration with the help active control system. This system consists two levels – global local level. At scale, three actuators per segment edge sensors intersegment sides used maintain shape mirror. level, actuator executes...
The upcoming large astronomical telescopes are trending towards the Segmented Mirror Telescope (SMT) technology, initially developed at W M Keck Observatory in Hawaii, where two largest SMTs world use. SMT uses number of smaller hexagonal mirror segments aligned and positioned by use three position/force actuators six intersegment edge sensors. This positioning needs to be done within nanometer range make them act like a monolithic primary presence different disturbances wind, vibration &...
The segmented mirror telescopes are built using small hexagonal mirrors positioned and aligned by the three actuators six edge sensors per segment to maintain shape of primary mirror. global loop controller does this sending commands move within few nanometers. These executed at individual actuator locally a precision controller. paper describes our effort develop India TMT Coordination Centre (ITCC) laboratory, Indian Institute Astrophysics, Bangalore. is implemented around single board...
The Indian Institute of Astrophysics is developing a Multi-Conjugate Adaptive Optics system for the Kodaikanal Tower Telescope. In this context, we measured daytime turbulence strength profile at Observatory. first method based on wavefront sensor images, called solar differential image motion monitor+, was used to estimate higher altitude up height 5 6 km. second balloon-borne temperature sensors measure near-Earth 350 m. We also carried out simulations validate performance our system....
TMT adopts Stressed Mirror Polishing (SMP) technology for the polishing of mirror segments. In this process, meniscus type spherical shape glass blanks are converted in to a desired aspheric by grinding and stressed condition. After each activity metrological measurements done using different metrology tools. The tool named as 2D-Profilometer is used low frequency error/foam measurements. It consists 61 high precision length gauges attached Carbon Fiber Reinforced Polymer (CFRP) sandwiched...
As a collaborative effort within the Thirty Meter Telescope (TMT) project, India is committed to supplying 84 polished segments for primary mirror, employing innovative Stressed Mirror Polishing (SMP) technology obtained from Coherent Inc., USA. SMP allows efficient polishing of highly aspheric non-axisymmetrical glass blanks at an accelerated rate. India-TMT (I-TMT) successfully applied qualify three roundels Coherent's facility in Richmond, CA. The study focuses on comparative analysis...
The Indian Institute of Astrophysics (IIA) is developing a Multi-Conjugate Adaptive Optics (MCAO) system for the Kodaikanal Tower Telescope (KTT). In this context, we have measured daytime turbulence strength profile at Observatory. first method based on wavefront sensor (WFS) images, called S-DIMM+ (Solar-Differential Image Motion Monitor+), was used to estimate higher altitude up height 5 - 6 km. second balloon-borne temperature sensors measure near-Earth 350 m. We also carried out...
The Thirty Meter Telescope (TMT) Primary Mirror (M1) is composed of 492 hexagonal aspheric segments. In order to compensate for residual polishing errors, installation gravity effects and parasitic forces in the whiffletree support, each segment equipped with 21 Warping Harness (WH) mechanisms, which allow low corrections optical surface. primary mirror aberrations after shape warping harness have been identified as single largest error term image quality budget<sup> [1]</sup>. WH mechanism...
Upcoming large telescopes are based on Segmented Mirror Telescope (SMT) technology which uses small hexagonal mirror segments placed side by to form the monolithic surface. The alignment needs be maintained against external disturbances like wind, gravity, temperature and structural vibration. This is achieved using three position actuators per segment working at few-nanometer scale range along with a local closed loop controller. actuator controller required meet very stringent performance...
To cater the need of growing astronomical community India, there is a proposal to install 10-12m size optical-NIR telescope, equipped with state art back-end instruments . A telescope this possible only, when primary mirror made smaller segments. In order get acquainted segmented technology, at Indian Institute Astrophysics Bangalore, we have initiated project develop small prototype The proposed will use seven hexagonal mirrors, which be supported by simple support assembly and driven...
Segmented mirror telescopes (SMT) are built using several small hexagonal mirrors positioned and aligned by the three actuators six edge sensors per segment to maintain shape of primary mirror. The responsible for maintaining tracking segments desired position, in presence external disturbances introduced wind, vibration, gravity, temperature. present paper describes our effort develop a soft actuator controller prototype SMT at Indian Institute Astrophysics, Bangalore. designed, developed,...
Dr. Ambedkar, one of the multi dimensional personalities having great noteworthy contribution in economics. He led for downtroddens country and was way ahead his times. Ambedkar's thoughts economics have made a significant impact on social movement. This research paper attempts to discuss about B.R. economic its relevance current Indian Economy.