Mind over matter: The intellectual content of experimental physics

Telegdi, V. L.

doi:10.1007/bf03000988

Cited by 2 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Why is the rate of nutation of a rotating plate removed by a factor of 2 from that of the plate rotation (Feynman 1989, Martinez 1992)? In optics, how could Michelson et al (1925) have measured the absolute value of the rotation rate of the Earth as a fringe shift in their mile long optical ring interferometer while it was fixed on the Earth when they could not check the zero of the fringe position by stopping the Earth's rotation (Telegdi 1990, Anderson et al 1994? In electrodynamics, when a bar magnet is rotated, do the lines of magnetic flux rotate with it and could they so generate a Faraday emf in a suitable fixed circuit (Aono and Sugihara 1987)?…”

Section: Rotationmentioning

confidence: 99%

“…In this way he overcomes the difficulty that we are not able to change the direction of the earth's rotation'. Telegdi (1990) labelled this problem as 'the devil'. Before Michelson's work, Larmor taunted Lodge on his similar proposal: 'It is suggested that you are going to reverse the rotation of the earth in order to get an interference effect around your circuit'.…”

Section: Early Historymentioning

confidence: 99%

See 1 more Smart Citation

Ring-laser tests of fundamental physics and geophysics

1997

View full text Add to dashboard Cite

HeNe ring-laser gyros are standard sensors in inertial guidance; mirror reflectances now reach 99.9999%. Present research instruments have an area of ∼ 1 m 2 , a passive quality factor of 10 11 , and a resolution of the frequency difference of counter-rotating optical beams approaching microhertz. In the Sagnac effect, this difference is proportional to the angular velocity. Present resolution is limited by thermal drifts in frequency pulling, itself reflecting mirror backscatter. The capability of ring lasers for measurements of geodesic interest, including seismometry and earth tides, and for detection of other sources of nonreciprocal refractive indices, including axions and CP violation, are discussed. In standard polarization geometries the observable is necessarily time-reversal odd. Scaling rules for dimensions, finesse etc summarizing past progress and suggesting future potential are given.

show abstract

Section: Rotationmentioning

confidence: 99%

Section: Early Historymentioning

confidence: 99%

Ring-laser tests of fundamental physics and geophysics

1997

View full text Add to dashboard Cite

show abstract

“…Franklin (1986) has emphasised, and recent stirring events in condensed matter verify, that novel experiments do not require a supporting theory; physics is an experimental science. Telegdi (1990) has emphasised such points in the context of a warm tribute to the skill of Michelson and Gale (1925) in their historic interferometric measurement of the Sagnac effect from earth rotation.…”

Section: (2e) Tests Of Preferred-frame Theoriesmentioning

confidence: 99%

Canterbury Ring Laser and Tests for Nonreciprocal Phenomena

Stedman¹,

Bilger²,

Li³

et al. 1993

Aust. J. Phys.

View full text Add to dashboard Cite

An historic and simple experiment has been revitalised through the availability of supercavity mirrors and also through a heightened interest in interferometry as a test of physical theory. We describe our helium-neon ring laser, and present results demonstrating a fractional frequency resolution of 2�1x10-18 (1�0 mHz in 474 THz). The rotation of the earth unlocks the counterrotating beams. A new field of spectroscopy becomes possible, with possible applications to geophysical measurements such as seismic events and earth tides, improved measurements of Fresnel drag, detection of ultraweak nonlinear optical propert~es of matter, and also searches for preferred frame effects in gravitation and for pseudoscalar particles.

show abstract

Mind over matter: The intellectual content of experimental physics

Cited by 2 publications

References 10 publications

Ring-laser tests of fundamental physics and geophysics

Ring-laser tests of fundamental physics and geophysics

Canterbury Ring Laser and Tests for Nonreciprocal Phenomena

Contact Info

Product

Resources

About