A reference-beam autocollimator with nanoradian sensitivity from mHz to kHz and dynamic range of 10^7 · HackerPapers discussions

A reference-beam autocollimator with nanoradian sensitivity from mHz to kHz and dynamic range of 10^7 — mentioned by ISL

Mon, 08 Oct 2018 15:39:24 GMT

One need not have something as expensive as Hubble to have such angle sensitivity. This instrument can resolve an angle change of < 0.3 millionths of a degree in one second. https://arxiv.org/abs/1309.4828 Disclaimer -- am an author. Edit: and this instrument, using the autocollimator above, can do the same thing for inertial sensing. Same disclaimer applies. https://aip.scitation.org/doi/10.1063/1.4862816

Paper and discussion history. A mention is not an endorsement.

A reference-beam autocollimator with nanoradian sensitivity from mHz to kHz and dynamic range of 10^7 — mentioned by ISL

Sat, 26 Apr 2014 06:18:24 GMT

Corning's specs state "Compatible with USB 3.0 and USB 2.0 devices", so I'm still an optimist. We tried to get one early from them, and nearly did, but ultimately couldn't. At $100, I'm sure we'll be trying it out when they're available. Our applications already function well without isolation [1,2], but I'd love to know for certain that the last little bit of ADC noise we see is intrinsic to our readout system and not a little bit of hash on ground. [1] http://arxiv.org/abs/1309.4828 [2] http://arxiv.org/abs/1401.4412

Paper and discussion history. A mention is not an endorsement.

A reference-beam autocollimator with nanoradian sensitivity from mHz to kHz and dynamic range of 10^7 — mentioned by ISL

Sat, 07 Dec 2013 21:30:06 GMT

We do precision tests of gravity and searches for forces weaker than gravity. (Front page is dated, see publications tab for more recent work) http://www.npl.washington.edu/eotwash/ The most-important experiment we do is to test the Equivalence Principle [1], the idea that if you drop two things in vacuum, they'll fall at the same rate regardless of what they're made from. Results from our lab have shown that, at 1 part in 10,000,000,000,000 (10^-13), that's apparently true. General Relativity takes the Equivalence Principle as a postulate, and works from there. Many theories of new physics…

Paper and discussion history. A mention is not an endorsement.