An accurate optical technique for measuring the nuclear polarisation of3He gas

New optical technique for measuring erythrocyte deformability with the ektacytometer.

The laser light scattered by erythrocytes subjected to a well-defined shear stess can be analyzed with the ektacytometer to obtain information regarding the changes in cell shape due to fluid shear. We describe an optical technique whereby an observed quantitative output derived from a mesurement of light intensity through a spatial filter is related to the change in cellular dimensions that we...

An accurate means for measuring formants

This paper describes a new kind of power spectrum which, when properly employed, can provide hitherto unseen accuracy in probing the resonance spectrum of the vocal tract. By drawing on new signal processing techniques developed by Nelson and his collaborators [2, 3], a method for computing a power spectrum has been implemented in Matlab, and applied to the problem of the accurate measurement o...

Accurate optical measurement of nuclear polarization in optically pumped 3He gas

Polarisation control through an optical feedback technique and its application in precise measurements

We present an anisotropic optical feedback technique for controlling light polarisation. The technique is based on the principle that the effective gain of a light mode is modulated by the magnitude of the anisotropic feedback. A new physical model that integrates Lamb's semi-classical theory and a model of the equivalent cavity of a Fabry-Perot interferometer is developed to reveal the physica...

Measuring CMB polarisation with the Planck mission

In this paper, we discuss why and how the Planck mission, originally designed and proposed for mapping intensity fluctuations, has been revised for polarisation measurement capability as well.