Dr David Bramall's Outputs (7)

Overview of the Fiber System for the Dark Energy Spectroscopic Instrument (2024)
Journal Article
Poppett, C., Tyas, L., Aguilar, J., Bebek, C., Bramall, D., Claybaugh, T., Edelstein, J., Fagrelius, P., Heetderks, H., Jelinsky, P., Jelinsky, S., Lafever, R., Lambert, A., Lampton, M., Levi, M. E., Martini, P., Rockosi, C., Schmoll, J., Sharples, R. M., Sirk, M., …Zhou, R. (2024). Overview of the Fiber System for the Dark Energy Spectroscopic Instrument. Astronomical Journal, 168(6), Article 245. https://doi.org/10.3847/1538-3881/ad76a4

The Dark Energy Spectroscopic Instrument (DESI) is a revolutionary instrument designed for precise measurements of cosmic distances and the investigation of dark energy. DESI utilizes 5000 optical fibers to simultaneously measure the spectra of dista... Read More about Overview of the Fiber System for the Dark Energy Spectroscopic Instrument.

Overview of Space-Based Laser Communication Missions and Payloads: Insights from the Autonomous Laser Inter-Satellite Gigabit Network (ALIGN) (2024)
Journal Article
Younus, O. I., Riaz, A., Binns, R., Scullion, E., Wicks, R., Vernon, J., Graham, C., Bramall, D., Schmoll, J., & Bourgenot, C. (2024). Overview of Space-Based Laser Communication Missions and Payloads: Insights from the Autonomous Laser Inter-Satellite Gigabit Network (ALIGN). Aerospace, 11(11), Article 907. https://doi.org/10.3390/aerospace11110907

This paper examines the growing adoption of laser communication (lasercom) in space missions and payloads for identifying emerging trends and key technology drivers of future optical communications satellite systems. It also presents a comprehensive... Read More about Overview of Space-Based Laser Communication Missions and Payloads: Insights from the Autonomous Laser Inter-Satellite Gigabit Network (ALIGN).

Steering Mirror System with Closed-Loop Feedback for Free-Space Optical Communication Terminals (2024)
Journal Article
Graham, C., Bramall, D., Younus, O., Riaz, A., Binns, R., Scullion, E., Wicks, R. T., & Bourgenot, C. (2024). Steering Mirror System with Closed-Loop Feedback for Free-Space Optical Communication Terminals. Aerospace, 11(5), Article 330. https://doi.org/10.3390/aerospace11050330

Precision beam pointing plays a critical role in free-space optical communications terminals in uplink, downlink and inter-satellite link scenarios. Among the various methods of beam steering, the use of fast steering mirrors (FSM) is widely adopted,... Read More about Steering Mirror System with Closed-Loop Feedback for Free-Space Optical Communication Terminals.

Topology Optimization of a Single-Point Diamond-Turning Fixture for a Deployable Primary Mirror Telescope (2024)
Journal Article
Bourgenot, C., Krumins, V., Bramall, D. G., & Haque, A. M. (2024). Topology Optimization of a Single-Point Diamond-Turning Fixture for a Deployable Primary Mirror Telescope. Aerospace, 11(1), Article 50. https://doi.org/10.3390/aerospace11010050

CubeSats, known for their compact size and cost effectiveness, have gained significant popularity. However, their limited size imposes restrictions on the optical aperture and, consequently, the Ground Resolution Distance in Earth Observation mission... Read More about Topology Optimization of a Single-Point Diamond-Turning Fixture for a Deployable Primary Mirror Telescope.

WIVERN: a laboratory experiment for testing novel laser-based wavefront sensing techniques (2022)
Presentation / Conference Contribution
Bharmal, N. A., Bramall, D., Calcines Rosario, A. Z., Morris, T. J., Schmoll, J., & Staykov, L. (2022, December). WIVERN: a laboratory experiment for testing novel laser-based wavefront sensing techniques. Presented at Adaptive Optics Systems VIII

WIVERN is a testbed for laboratory experiments in laser-based wavefront sensing. It emulates laser uplink from a 4m telescope with 1.6 arcsec seeing and laser back-scattering from up to 20 km. Currently there are three current wavefront sensing capab... Read More about WIVERN: a laboratory experiment for testing novel laser-based wavefront sensing techniques.

A four mirror anastigmat collimator design for optical payload calibration (2016)
Presentation / Conference Contribution
Rolt, S., Calcines, A., Lomanowski, B. A., & Bramall, D. G. (2016, December). A four mirror anastigmat collimator design for optical payload calibration. Presented at Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh

We present here a four mirror anastigmatic optical collimator design intended for the calibration of an earth observation satellite instrument. Specifically, the collimator is to be applied to the ground based calibration of the Sentinel-4/UVN instru... Read More about A four mirror anastigmat collimator design for optical payload calibration.

An efficient stable optical polariser module for calibration of the S4UVN earth observation satellite (2016)
Presentation / Conference Contribution
Rolt, S., Calcines, A., Lomanowski, B., Bramall, D., & Shaw, B. (2016, December). An efficient stable optical polariser module for calibration of the S4UVN earth observation satellite. Presented at Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh

We describe here an optical polariser module intended to deliver well characterised polarised light to an imaging spectrometer instrument. The instrument in question is the Sentinel-4/UVN Earth observation imaging spectrometer due to be deployed in 2... Read More about An efficient stable optical polariser module for calibration of the S4UVN earth observation satellite.