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Atkinson, C.

Publications and source records attributed to Atkinson, C..

6 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS2014

Lessons We Learned Designing and Building the Chandra Telescope

2014 marks the crystal (15th) anniversary of the launch of the Chandra X‐ray Observatory. This paper offers some of the major lessons learned by some of the key members of the Chandra Telescope team. We offer some of the lessons gleaned from our experiences developing, designing, building and testing the telescope and its subsystems, with 15 years of hindsight. Among the topics to be discussed are the early developmental tests, known as VETA‐I and VETA‐II, requirements derivation, the impact of late requirements and reflection on the conservatism in the design process.

Arenberg, Jonathan↗
NASA NTRS2004

Direct Measurement of Large, Diffuse, Optical Structures

Digital Speckle Pattern Interferometry (DSPI) is a well-established method for the measurement of diffuse objects in experimental mechanics. DSPIs are phase shifting interferometers. Three or four bucket temporal phase shifting algorithms are commonly used to provide phase shifting. These algorithms are sensitive to vibrations and can not be used to measure large optical structures far away from the interferometer. In this research a simultaneous phase shifted interferometer, PhaseCam product of 4D Technology Corporation in Tucson Arizona, is modified to be a Simultaneous phase shifted Digital Speckle Pattern Interferometer (SDSPI). Repeatability, dynamic range, and accuracy of the SDSPI are characterized by measuring a 5 cm x 5 cm carbon fiber coupon.

Saif, Babak N.↗
NASA NTRS2000

Virtual California

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virtual California CASDE↗
NASA NTRS1997

NASA tests composters for space

For long term missions, composters may be an integral part of a life support system that provides edible food crops, extracts nutrients from plant biomass and removes contaminants from the recycling stream.

Plants/growth & development↗