Palomar Adaptive Optics Project: Status and Performance

Dekens, F.; Brandl, B.; Hayward, T.; Bloemhof, E.; Trinh, T.; Oppenheimer, B.; Shi, F.; Brack, G.; Dekany, R.; Troy, M.

Home/Archive/NASA NTRS

NASA NTRS · 20210001074

Palomar Adaptive Optics Project: Status and Performance

Dekens, F.·Brandl, B.·Hayward, T.·Bloemhof, E.·Trinh, T.·Oppenheimer, B.·Shi, F.·Brack, G.·Dekany, R.·Troy, M.

View original source ↗Export metadata ↓

Abstract

We describe the current status of the Palomar 200 inch adaptive optics system, which in December of 1998 achieved its first high order (241 actuators) lock on a natural guide star.

Explore related subjects

adaptive optics telescopes instrumentation

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

Dekens, F., Brandl, B., Hayward, T., Bloemhof, E., Trinh, T., Oppenheimer, B., Shi, F., Brack, G., Dekany, R., Troy, M.. 2000-03-27. Palomar Adaptive Optics Project: Status and Performance. https://ntrs.nasa.gov/citations/20210001074

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2022

Modeling Distributed Energy Resources for Analyzing Distribution Systems with High Renewable Penetration: Preprint

Increasing levels of inverter-based distributed energy resources (IBDERs) impact the legacy overcurrent distribution protection systems. The fault current injections of IBDERs are limited to between 1-2 p.u. of the rated current. The combination of the limited fault current and varying system load makes it increasingly difficult to reliably set the overcurrent protection. To address this challenge, researchers are proposing adaptive overcurrent protection mechanisms that can adapt to changing system conditions. Accurate modeling of IBDERs is required to develop reliable protection schemes. This paper presents a photovoltaics-based IBDER model in OpenDSS for adaptive overcurrent protection. The paper presents the validation of the proposed IBDER model against a detailed model in electromagnetic transient programs. Protection analysis of the Electric Power Research Institute J1 feeder with the proposed IBDER model is also presented.

adaptive↗

NASA NTRS2003

Phase contrast techniques for wavefront sensing and calibration in adaptive optics

The wavefront sensor is the most critical component of an adaptive optics system. Most astronomical systems use one of a small number of altenatives, notably the Shack-Hartmann or the curvature sensor; these are sensitive to the first and second derivative of the wavefront phase, respectively.

adaptive↗

NASA NTRS2003

Speckles in a highly corrected adaptive optics system

UNKNOWN

adaptive↗