A5061033135- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astronomy and Astrophysical Research
- Radar Systems and Signal Processing
- Embedded Systems Design Techniques
- Infrared Target Detection Methodologies
- Advanced Measurement and Metrology Techniques
- Superconducting and THz Device Technology
- Particle Accelerators and Free-Electron Lasers
- CCD and CMOS Imaging Sensors
- Optical Systems and Laser Technology
- Advanced Thermoelectric Materials and Devices
- Seismic Imaging and Inversion Techniques
- Soil Moisture and Remote Sensing
- Image and Signal Denoising Methods
- Direction-of-Arrival Estimation Techniques
- Heat Transfer and Boiling Studies
- Experimental Learning in Engineering
- Embedded Systems and FPGA Design
- Optical Polarization and Ellipsometry
- VLSI and Analog Circuit Testing
- IoT-based Smart Home Systems
Southern California University for Professional Studies
2025
University of Southern California
2025
University of Amsterdam
2013-2021
ASML (Netherlands)
2021
Raman Research Institute
2006-2017
Netherlands Institute for Radio Astronomy
2014-2015
We describe the APERture Tile In Focus (Apertif) system, a phased array feed (PAF) upgrade of Westerbork Synthesis Radio Telescope that transforms this telescope into high-sensitivity, wide-field-of-view L -band imaging and transient survey instrument. Using novel PAF technology, up to 40 partially overlapping beams are formed on sky simultaneously, significantly increasing speed telescope. With upgraded instrument, an covering area 2300 deg 2 is being performed will deliver both continuum...
The Amsterdam–ASTRON Radio Transients Facility and Analysis Center (AARTFAAC) all-sky monitor is a sensitive, real-time transient detector based on the Low Frequency Array (LOFAR). It generates images of low frequency radio sky with spatial resolution tens arcmin, MHz bandwidths, time cadence few seconds, while simultaneously but independently observing LOFAR. image timeseries then monitored for short bright transients. On detection transient, latency trigger will be generated LOFAR, which...
Accurately measuring the geometry and spatially-varying reflectance of real-world objects is a complex task due to their intricate shapes formed by concave features, hollow engravings diverse surfaces, resulting in inter-reflection occlusion when photographed. Moreover, issues like lens flare overexposure can arise from interference secondary reflections limitations hardware even professional studios. In this paper, we propose novel approach using polarized field capture comprehensive...
The search for transient phenomena at low radio frequencies is now coming of age with the development sky monitors a large field view, which are made feasible by new developments in calibration algorithms and computing. However, accurate such arrays challenging, especially within latency requirements near real-time monitors, main cause limiting their sensitivities. This paper describes strategy real-time, wide-field direction-dependent Amsterdam-ASTRON Radio Transients Facility Analysis...
We report on the detection of extreme giant pulses (GPs) from one oldest-known pulsars, highly variable PSR B0950+08, with Amsterdam-ASTRON Radio Transient Facility And Analysis Centre (AARTFAAC), a parallel transient instrument operating as subsystem LOw Frequency ARray (LOFAR). During processing our Northern Hemisphere survey for low-frequency radio transients, sample 275 fluences ranging 42 to 177 kJy ms were detected in one-second snapshot images. The brightest are an order magnitude...
We present a method for calibrating the flux density scale images generated by Amsterdam ASTRON Radio Transient Facility And Analysis Centre (AARTFAAC). AARTFAAC produces stream of all-sky at rate one second in order to survey Northern Hemisphere short duration, low frequency transients, such as prompt EM counterpart gravitational wave events, magnetar flares, blazars, and other yet unobserved phenomena. Therefore, an independent scaling solution per image is calculated via bootstrapping,...
We report the experimental setup and overall results of AARTFAAC wide-field radio survey, which consists observing sky within 50$^\circ$ Zenith, with a bandwidth 3.2$\,$MHz, at cadence 1$\,$s, for 545$\,$h. This yielded nearly 4 million snapshots, two per second, on average 4800 square degrees sensitivity around 60$\,$Jy. find populations transient events, one originating from PSR$\,$B0950$+$08 strong ionospheric lensing as well single candidate an extragalactic transient, peak flux density...
With their wide fields of view and often relatively long coverage any position in the sky imaging survey mode, modern radio telescopes provide a data stream that is naturally suited to searching for rare transients. However, Radio Frequency Interference (RFI) can show up similar ways such transients, thus normal pre-treatment filtering RFI (flagging) may also remove astrophysical transients from before imaging. In this paper we investigate how standard flagging affects detectability by...
The AARTFAAC project aims to implement an All-Sky Monitor (ASM), using the Low Frequency Array (LOFAR) telescope. It will enable real-time, 24x7 monitoring for low frequency radio transients over most of sky locally visible LOFAR at timescales ranging from milliseconds several days, and rapid triggering follow-up observations with full on detection potential transient candidates. These requirements pose implementation challenges: imaging all-sky field view, latencies processing, continuous...
Power-spectrum analysis is an important tool providing critical information about a signal. The range of applications includes communication-systems to DNA-sequencing. If there interference present on transmitted signal, it could be due natural cause or superimposed forcefully. In the later case, its early detection and becomes important. such situations having small observation window, quick look at power-spectrum can revel great deal information, including frequency source interference....
Accurately measuring the geometry and spatially-varying reflectance of real-world objects is a complex task due to their intricate shapes formed by concave features, hollow engravings diverse surfaces, resulting in inter-reflection occlusion when photographed. Moreover, issues like lens flare overexposure can arise from interference secondary reflections limitations hardware even professional studios. In this paper, we propose novel approach using polarized field capture comprehensive...
The APERTIF (APERture Tile In Focus) project aims to install Phased Array Feeds (PAFs) in the 25m diameter reflector antennas of Westerbork Synthesis Radio Telescope (WSRT). These PAF systems can simultaneously form 37 compound beams on sky and will replace current single beam horn feeds. survey speed WSRT be improved significantly, bringing down time execute a deep wide-field astronomical by few orders magnitude. detailed design phase is completed samples final hardware have been tested...
The Amsterdam-ASTRON Radio Transients Facility And Analysis Center (AARTFAAC) all sky monitor is a sensitive, real time transient detector based on the Low Frequency Array (LOFAR). It generates images of low frequency radio with spatial resolution 10s arcmin, MHz bandwidths, and cadence few seconds, while simultaneously but independently observing LOFAR. image timeseries then monitored for short bright transients. On detection transient, latency trigger will be generated LOFAR, which can...
Abstract In the recent past, cooling via thermoelectric technology has arisen to be as one of capable which helps in lowering energy intake a device. this study, performance enhancement system for computer processor using cooler is investigated. An open loop was taken into consideration, where main parameters are focused on load conditions, temperature carried by nanofluid or output at water block and heat flux. The (TEC) made Bismuth Telluride (BiTe 3 ) material pn junctions used with Delta...
The purpose of this document is to generate a reliable primary beam model for AARTFAAC-6. This necessary compensate the response in all-sky images, whose effect attenuate sources away from pointing center. AARTFAAC system piggybacks on LOFAR antennae 12 stations including 6 superterp and first ring station surrounding it.
We present the imaging subsystem of AARTFAAC interferometric array, an All-sky monitor for detecting short term (seconds to minutes) transient activity celestial radio sources in near real time. optimize point source sensitivity, and reduce sidelobe confusion noise significantly enhance detectability. The resulting images have a dynamic range ∼2000∶1 with 1 sec/90kHz integration at 60 MHz. They are limited few tens seconds due ∼1deg Point Spread Function (PSF) instrument making array most...