A5038550460- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
- Inertial Sensor and Navigation
- Aerospace Engineering and Energy Systems
- Solar and Space Plasma Dynamics
- CCD and CMOS Imaging Sensors
- Photocathodes and Microchannel Plates
- Spacecraft Design and Technology
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
- Planetary Science and Exploration
- Gamma-ray bursts and supernovae
- Optical Polarization and Ellipsometry
- Underwater Vehicles and Communication Systems
- Space Satellite Systems and Control
- Optical Coatings and Gratings
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Advanced Optical Sensing Technologies
- Thermal Radiation and Cooling Technologies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Radiation Effects in Electronics
- Optical and Acousto-Optic Technologies
- Spacecraft Dynamics and Control
Nanyang Technological University
2020-2022
Indian Institute of Astrophysics
2014-2019
We describe the characterization and removal of noises present in Inertial Measurement Unit (IMU) MPU- 6050, which was initially used an attitude sensor, later development a pointing system for small balloon-borne astronomical payloads. found that performance IMU degraded with time because accumulation different errors. Using Allan variance analysis method, we identified components noise IMU, verified results by power spectral density (PSD). tried to remove high-frequency using smooth...
We have developed a lightweight low-cost attitude sensor, based on Raspberry Pi, built with readily available commercial components. It can be used in experiments where weight and power are constrained, such as high- altitude balloon flights. This sensor will major building block closed-loop control system driver motors to stabilize point cameras telescopes for astronomical observations from balloon-borne payload.
We describe the development and implementation of a light-weight, fully autonomous 2-axis pointing stabilization system designed for balloon-borne astronomical payloads. The is developed using off-the-shelf components such as Arduino Uno controller, HMC 5883L magnetometer, MPU-9150 inertial measurement unit, iWave GPS receiver unit. It compact rugged which can also be used to take images/video in moving vehicle or real photography. performance evaluated from ground, well conditions simulated...
MCP-based detectors are widely used in the ultraviolet (UV) region due to their low noise levels, high sensitivity and good spatial temporal resolution. We have developed a compact near-UV (NUV) detector for high-altitude balloon space flights, using off-the-shelf MCP, CMOS sensor, optics. The is designed be capable of working direct frame transfer mode as well photon-counting single photon event detection. identification centroiding each done an FPGA-based data acquisition real-time...
The ultraviolet (UV) window has been largely unexplored through balloons for astronomy. We discuss here the development of a compact near-UV spectrograph with fiber optics input balloon ights. It is modified Czerny-Turner system built using off-the-shelf components. portable and scalable to different telescopes. use re ecting reduces transmission loss in UV. employs an image-intensified CMOS sensor, operating photon counting mode, as detector choice. A lightweight pointing developed stable...
We have initiated the High-Altitude Ballooning programme at Indian Institute of Astrophysics, Bangalore, in year 2011 with primary purpose developing and flying low-cost scientific payloads on a balloon-borne platform. The main aim is observations extended nearby objects (e.g. comets) diffuse sources zodiacal light or airglow) wide field view (FOV) UV instruments from near space (20 to 30 km). A brief summary results tethered flights carried out IIA CREST campus are given Ref.~1. Here we...
We present here a low-cost Raspberry Pi (RPi)-based star sensor StarberrySense using commercial-off-the-shelf (COTS) components, developed and built for applications in small satellites CubeSat-based missions. A is one of the essential instruments onboard satellite attitude determination. However, most commercially available sensors are expensive bulky to be used configurable system -- it can operate as an imaging camera, centroiding or sensor. describe algorithms implemented sensor, its...
For space-based astronomical observations, it is important to have a mechanism capture the digital output from standard detector for further on-board analysis and storage. We developed generic (application- wise) field-programmable gate array (FPGA) board interface with an image sensor, method generate clocks required read data real-time processor system (on-chip) which can be used various processing tasks. The FPGA applied as in Lunar Ultraviolet Cosmic Imager (LUCI) star sensor (StarSense)...
Abstract. We describe a method to measure the solar scattered UV radiance and trace gases in upper troposphere stratosphere using spectrograph carried by high-altitude balloons. The flights have been conducted over tropical regions near urban areas. instrumentation was developed off-the-shelf components can be easily reproduced. design of instrument, its operation flight discuss some result. Observations were performed looking towards Earth's limb at Sun angles more than 90 degrees altitudes...
We have designed and developed a compact ultraviolet imaging payload to y on range of possible platforms such as high altitude balloon experiments, cubesats, space missions, etc. The primary science goals are study the bright UV sources (mag < 10) also look for transients in Near (200 - 300 nm) domain. Our first choice is place this instrument spacecraft going Moon part Indian entry into Google lunar X-Prize competition. major constraints are, it should be lightweight (< 2Kg), (length 50cm)...
We are developing a compact UV Imager using light weight components, that can be flown on small CubeSat or balloon platform. The system has lens-based optics provide an aberration-free image over wide field of view. backend instrument is photon counting detector with off-the-shelf MCP, CMOS sensor and electronics. Z-stack MCP high voltage power supply phosphor screen anode, which read out by the associated used to observe solar objects detect bright transients from upper atmosphere help...
The Pesit/IIA Observatory for the Night Sky(PIONS) is a near UV imaging telescope to be flown on small satellite. instrument 150mm RC that covers wavelength range of 180-280 nm. We are using an intensified CMOS detector with solar blind photocathode, operated in photon counting mode. has wide field view 3 degrees and angular resolution 13". plan point scan sky continuously along sun pointing axis look variable sources such as flare stars, AGNs, other transient events. can detect objects...
We intend to develop a compact detector for balloon and space flights using off-the-shelf MCPs, CMOS sensors optics. The should be capable of working in direct frame transfer mode as well photon counting single event detection. identification centroiding each is done an FPGA(Field programmable Gate Array) based data acquisition real-time processing system. This guarantees good deal flexibility allowing easy testing different algorithms without modifying the external connections, thus...