Determination of the optical constants of thin films in the visible by static dispersive Fourier transform spectroscopy

Abstract

A comparative study of the dipole-polarizability of the metallocenes Fe(C 5 H 5 ) 2 , Ru(C 5 H 5 ) 2 and Os(C 5 H 5 ) 2 by means of dispersive Fourier transform spectroscopy in the visible (DFTS-VIS) AIP Conf.

Quasi-holographic solution to polarization-sensitive optical coherence tomography acceptable to nonlaboratory applications

“…Such modulation yields either in-phase or anti-phase fringes. 15,41,42 At zero OPD, the in-phase fringes F in will exhibit positive peaks, and the anti-phase fringes F anti will exhibit negative peaks of a noisy interference signal s superimposed on a dc background B dc . The background B dc consists of a noncoherent stationary component and a constant bias caused, e.g., by dust particles.…”

Passive mm-wave imaging from UAVs using aperture synthesis

“…If necessary a single optical fibre may be used to multiplex many sensors, but as an absolute minimum a single sensor is required for each degree of freedom of a flexible structure (26) . Traditionally interrogation is achieved with moving-mirror Michelson interferometers, but for use on an aircraft no-moving-parts interferometry using channelled spectrum (25) or spatial interferometers (27) is more attractive.…”

“…Fibre sensors may be imbedded on opposite sides of the wing, and bending may be measured from the differential strain in each fibre. With white light optical interferometry, 1µm displacement can be measured (27) so that for a 1m long sensor and a wing 2⋅75m long and 5cm thick, displacements of less than 0⋅1µm (worst case) can be measured in the plane of the antenna which is equal to about 0⋅01º of phase error in the mm-wave signal: an accuracy more than 30 times better than is required for accurate calibration. In summary, it is proposed that periodic in-service receiver calibration follows calibration techniques already developed for MIRAS, but real-time calibration of the antenna patterns will also be required.…”

Passive mm-wave imaging from UAVs using aperture synthesis

“…If necessary a single optical fibre may be used to multiplex many sensors, but as an absolute minimum a single sensor is required for each degree of freedom of a flexible structure* 26 '. Traditionally interrogation is achieved with moving-mirror Michelson interferometers, but for use on an aircraft no-moving-parts interferometry using channelled spectrum* 25 ' or spatial interferometers* 27 ' is more attractive.…”

“…Fibre sensors may be imbedded on opposite sides of the wing, and bending may be measured from the differential strain in each fibre. With white light optical interferometry, lum displacement can be measured* 27 ' so that for a lm long sensor and a wing 2-75m long and 5cm thick, displacements of less than 01 um (worst case) can be measured in the plane of the antenna which is equal to about 001 s of phase error in the mm-wave signal: an accuracy more than 30 times better than is required for accurate calibration. In summary, it is proposed that periodic in-service receiver calibration follows calibration techniques already developed for MIRAS, but real-time calibration of the antenna patterns will also be required.…”