EP 1019688 A1 20000719 - ORRICHTUNG Z
Title (en)
ORRICHTUNG Z
Title (de)
VORRICHTUNG ZUR MESSUNG DER WELLENLÄNGE EINES LICHTBÜNDELS
Title (fr)
APPAREIL DE MESURE DE LA LONGUEUR D'ONDE D'UN FAISCEAU LUMINEUX
Publication
Application
Priority
- FR 9901967 W 19990811
- FR 9810329 A 19980812
Abstract (en)
[origin: FR2782383A1] The device has an interferometer measuring system that includes a Fizeau wedge (18,20) delimited by two fixed, transparent plates slightly inclined to each other. The interferometer system has an optical transformer (12,16) to transform the light beam into a slightly divergent spherical light wave, which illuminates the Fizeau wedge, to eliminate measurement uncertainties resulting from parasitic reflections on the first plate. The light beam passes through the Fizeau wedge along an optical path of fixed length and enters the wedge (18,20) through the first plate. The external face of the first plate is treated with an anti-reflective material. The system has a high resolution detector (30,32), of interference fringes resulting from reflections of the light beam on the two internal faces of the two plates. The detector generates electrical signals corresponding to the interference fringes. An electrical signal processor (72,74,76) calculates the wavelength of the light beam from maximal positions of the electrical signals.
IPC 1-7
IPC 8 full level
CPC (source: EP)
G01J 9/02 (2013.01)
Citation (search report)
See references of WO 0009978A1
Designated contracting state (EPC)
DE GB NL
DOCDB simple family (publication)
FR 2782383 A1 20000218; FR 2782383 B1 20000915; EP 1019688 A1 20000719; JP 2002522782 A 20020723; WO 0009978 A1 20000224
DOCDB simple family (application)
FR 9810329 A 19980812; EP 99936719 A 19990811; FR 9901967 W 19990811; JP 2000565373 A 19990811