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FRENCH MOIRE [3 records]

Record 1 2010-09-27

English

Subject field(s)
  • Scientific Research Methods
  • Optics
CONT

Temporal Paul wavelet analysis for instantaneous phase extraction using shadow moiré technique is proposed. Unlike the Morlet wavelet, the Paul wavelet has less restriction on the adjustment of wavelet parameters and can provide an optimal time and frequency resolution for a particular application by selecting the proper parameters. The Paul wavelet is a complex wavelet and is suitable for processing the temporal intensity data obtained from the shadow moiré technique for the phase retrieval. The proposed method can extract the phase information related to the state of the dynamic object at every instant in temporal domain. The phase information is associated to the displacement, three-dimensional (3D) surface-profile and the instantaneous state of the dynamic object. In addition, the instantaneous frequency of vibrating object can be obtained using the scale of the wavelet ridge by direct integration without temporal and spatial phase unwrapping. Thus the phase unwrapping error can be avoided. An experiment is conducted on the central loaded beam to demonstrate the validity of the proposed technique.

OBS

The term “moiré” is... a French word referring to “an irregular wavy finish usually produced on a fabric by pressing between engraved rollers”(Webster's 1981). In optics it refers to a beat pattern produced between two gratings of approximately equal spacing. It can be seen in everyday things such as the overlapping of two window screens, the rescreening of a half-tone picture, or with a striped shirt seen on television. The use of moiré for reduced sensitivity testing was introduced by Lord Rayleigh in 1874. Lord Rayleigh looked at the moiré between two identical gratings to determine their quality even though each individual grating could not be resolved under a microscope.... Since Lord Rayleigh first noticed the phenomena of moiré fringes, moiré techniques have been used for a number of testing applications. Righi(1887) first noticed that the relative displacement of two gratings could be determined by observing the movement of the moiré fringes. The next significant advance in the use of moiré was presented by Weller and Shepherd(1948). They used moiré to measure the deformation of an object under applied stress by looking at the differences in a grating pattern before and after the applied stress. They were the first to use shadow moiré, where a grating is placed in front of a nonflat surface to determine the shape of the object behind it by using the shape of the moiré fringes.

French

Domaine(s)
  • Méthodes de recherche scientifique
  • Optique
CONT

Le moiré d’ombre. Cette technique […] consiste à créer un moiré entre une grille de référence placée juste devant l’objet, et l’ombre de cette même grille projetée sur la surface étudiée. Les déformations de cette surface modifient le pas du réseau «ombre» créant ainsi le moiré. Une mesure du pas de ce moiré permet, à l’aide des équations précédentes, de remont3er aux déformations locales et de dresser la carte des hauteurs.

CONT

Le moiré d’ombre. Il s’agit d’un dérivé (conceptuellement, pas historiquement) de la mesure de forme par projection de frange.

Spanish

Save record 1

Record 2 2008-02-25

English

Subject field(s)
  • Photoengraving
  • Silk-Screen Printing
DEF

Undesirable wavelike or checkered effect that results when a halftone is photographed through a screen. This effect ... is caused by parallel mesh dots.

OBS

When used in English, the French term "moiré"(spelt with an accent) is usually found in italics.

French

Domaine(s)
  • Photogravure
  • Sérigraphie
DEF

Brouillage d'une illustration en demi-teintes, qui intervient dans la reproduction d'une image imprimée déjà tramée (trame sur trame), dans l'impression par superposition de clichés de similigravure (polychromie) ou dans la reproduction d'un document en demi-teintes à l'écran de soie.

Spanish

Campo(s) temático(s)
  • Fotograbado
  • Serigrafía
DEF

Efecto que se produce al disponer los ángulos de tramas, en dos o más impresiones, de manera incorrecta.

OBS

Provoca la aparición de "aguas" y efectos geométricos en la imagen.

Save record 2

Record 3 2001-12-19

English

Subject field(s)
  • Fabric Nomenclature
DEF

A moiré rep fabric.

CONT

French moire ribbons with Jacquard borders.

CONT

Bar moire dress taffeta.

French

Domaine(s)
  • Nomenclature des tissus
CONT

D'après leurs dessins, on classe les moires en deux catégories : -- la moire antique (à grandes ondes); -- la moire française (à dessins plus petits).

Spanish

Save record 3

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