Two-wavelength laser interferometry using superheterodyne detection

Dändliker, R.; Thalmann, R.; Prongué, D.

doi:10.1364/ol.13.000339

Cited by 229 publications

(80 citation statements)

References 7 publications

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“…L'information sur la distance est contenue dans la phase à la fréquence f 2 − f 1 . Cette différence de fréquences est habituellement obtenue par élévation au carré des signaux contenant les fréquences f 1 et f 2 , grâce à un mélangeur de fréquence ( [19] par exemple). Cette technique a l'inconvénient d'utiliser un mélangeur de fréquences, pour élever au carré un signal envoyé sur les entrées IF et LO, qui convertit une variation d'amplitude du signal en variation de phase.…”

Section: Daq Cardunclassified

“…La phase synthétique est détectée par une technique dite superhétérodyne [19] : on module la fréquence synthétique et on détecte l'interférogramme à cette fréquence de modulation. En pratique, pour chaque faisceau de fréquence ν 1 et ν 2 , on génère un autre faisceau légère-ment décalé en fréquence respectivement d'une quantité f 1 et f 2 .…”

Section: Introductionunclassified

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Un télémètre transportable de résolution submicrométrique

Azouigui¹,

Badr²,

Juncar³

et al. 2015

R. franç. métrol.

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RésuméNous décrivons dans cet article la réalisation d'un télémètre transportable basé sur un principe d'interférométrie à longueur d'onde synthétique. Les sources lasers utilisées sont deux lasers YAG à 532 nm doublés en fréquence. Une technique de détection superhétérodyne a été mise en place pour réaliser une mesure de phase à 2π/5 600 près. Une exactitude d'environ 5 μm (1σ) a été mesurée sur 25 m, par comparaison avec un banc de déplacement interférométrique. Le système a été transporté en Finlande (Nummela) pour mesurer une ligne géodésique de référence, avec une incertitude type de 700 μm. Ce travail s'est fait dans le cadre du projet européen (JRP de l'EMRP) « Long distance » qui s'est achevé en juin 2011.

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Section: Daq Cardunclassified

Section: Introductionunclassified

Un télémètre transportable de résolution submicrométrique

Azouigui¹,

Badr²,

Juncar³

et al. 2015

R. franç. métrol.

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“…Conventionally, two laser wavelengths are used to obtain a long synthetic optical wavelength by means of heterodyne interferometry (Daendliker et al, 1988;Schuhler et al, 2006) and extend the NAR of a single wavelength metrology. However, instead of using the heterodyne detection technique which requires specialized optical elements and hence has higher cost, the dual-wavelength metrology described here employs a simple homodyne fringe counting detection scheme together with a (relatively) less precise stepper motor open-loop position control system to extend the range of distance the metrology can accurately measure.…”

Section: Dual-laser (Dl) Metrologymentioning

confidence: 99%

Phase-Referenced Interferometry and Narrow-Angle Astrometry With Susi

Kok

Ireland

Tuthill

et al. 2013

J. Astron. Instrum.

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This thesis describes the development of an astrometric facility at the Sydney University Stellar Interferometer (SUSI) with an aim to measure at high precision the relative astrometry of bright close binary stars and ultimately to detect the presence of exoplanets within those binary star systems through observations of the systems' perturbed motion. At the core of the facility is a new beam combiner that is phase-referenced to an existing primary beam combiner in the visible wavelength regime. The latter provides post-processed fringe-tracking information to the former for fringe stabilization and coherent integration of pre-recorded stellar fringes using newly developed data reduction software. Interference fringe packets of a binary star are recorded alternately; first the fringe packet of the primary, then the secondary, finally back to the primary again. The measurement of the fringe packet separation is facilitated by an air-filled differential delay line and a network of interferometer-based metrology systems. Characterizations and initial astronomical observations carried out with the dual beam combiner setup demonstrated for the first time the success of the dual-star phase-referencing technique in visible (ă1µm) wavelengths. The current astrometric precision is larger than 100µas while the long term astrometric accuracy is yet to be characterized. In a parallel development, a complementary observing method using only the primary beam combiner is also demonstrated in this thesis. Relative astrometry of binary stars up to "0.8 2 separation with this technique has been demonstrated to have precision of better than 100µas. A simple detection limit analysis based on a list of target binary stars estimates up to two exoplanet detections can be achieved with SUSI if the new astrometric facility attains precision of 10µas while the primary beam combiner operates at its designed peak performance. Finally, one new stellar companion was resolved and a preliminary astrometry for another suspected companion was estimated from the astronomical observation data collected throughout the course of this thesis.

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“…Multiple Wavelength Interferometry (MWI) is a technique were the use of (at least) two different wavelengths allows the generation of a synthetic wavelength much longer than the two individual optical wavelengths, actually increasing the non-ambiguity range (NAR) for interferometry (Dändliker et al, 1988;Dändliker et al, 1995). In MWI, each synthetic wavelength (one or several) is generated using two different and very accurately known optical wavelengths.…”

Section: Absolute Distance Measurement By Optical Interferometrymentioning

confidence: 99%