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EP0902350A1 - Procédé de traitement par transformation de Fourier de signaux optiques - Google Patents

Procédé de traitement par transformation de Fourier de signaux optiques Download PDF

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Publication number
EP0902350A1
EP0902350A1 EP98116147A EP98116147A EP0902350A1 EP 0902350 A1 EP0902350 A1 EP 0902350A1 EP 98116147 A EP98116147 A EP 98116147A EP 98116147 A EP98116147 A EP 98116147A EP 0902350 A1 EP0902350 A1 EP 0902350A1
Authority
EP
European Patent Office
Prior art keywords
processor
fourier
signal processing
fourier optical
beam splitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98116147A
Other languages
German (de)
English (en)
Inventor
Ernst Prof. Dr.-Ing. habil. Lüder
Norbert Dr.-Ing. Frühauf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Universitaet Stuttgart
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0902350A1 publication Critical patent/EP0902350A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06E—OPTICAL COMPUTING DEVICES; COMPUTING DEVICES USING OTHER RADIATIONS WITH SIMILAR PROPERTIES
    • G06E3/00—Devices not provided for in group G06E1/00, e.g. for processing analogue or hybrid data
    • G06E3/001—Analogue devices in which mathematical operations are carried out with the aid of optical or electro-optical elements
    • G06E3/003—Analogue devices in which mathematical operations are carried out with the aid of optical or electro-optical elements forming integrals of products, e.g. Fourier integrals, Laplace integrals, correlation integrals; for analysis or synthesis of functions using orthogonal functions

Definitions

  • the invention relates to a method for Fourier optical Signal processing with a Fourier optical processor.
  • the Fourier optical signal processing is based on the implementation a two-dimensional spatial Fourier transform with the help of a lens.
  • a disadvantage of the Fourier optical So far, signal processing has been the major requirement Volume of the processors.
  • the present invention is based on the object Propose methods for Fourier optical signal processing, the use of smaller ones with the same performance Processors.
  • the task is performed using a Fourier optical method Signal processing with a Fourier optical processor solved, which is characterized in that different polarized light signals in a multiplexing process in the Processor to be processed.
  • a Fourier optical processor solved which is characterized in that different polarized light signals in a multiplexing process in the Processor to be processed.
  • the vectorial Aspect of the light wave has usually not been exploited. Since the function of the optical Fourier transform used lenses regardless of the direction of polarization is the light wave, there is a possibility with help a polarization multiplexing process within a processor to implement two independent processing channels. Because of the possible multiple use of the processor, the processor canonical Solution have a volume reduced by up to 75%.
  • the procedure can also for the coherent detection of a light signal to be measured Signal superimposed on a time-modulated reference signal whose direction of polarization is perpendicular to that of the signal to be measured. Because of the extremely high temporal Frequency of the light waves are the output signals of all Light sensors of a Fourier optical processor proportional to the time average of the light output. For this The phase function of a Fourier-optically calculated reason can Spectrum determined only indirectly by interferometric methods be where the signal to be measured before detection a time-modulated phase signal is superimposed.
  • both signals can be in one processor are processed.
  • the time-modulated reference signal is a direction of polarization which is perpendicular to that of the measuring signal
  • both signals can be in one processor are processed.
  • the Fourier optical system is routed around has the solution according to the method mentioned, the advantage that the necessary optical system cheaper, more compact and therefore less sensitive to vibrations is.
  • the processor according to the invention for Fourier optical signal processing is characterized by a half Fourier lens with a downstream ⁇ / 4 plate and a non-polarized one and a polarized beam splitter, that of half the Fourier lens are connected upstream.
  • the ⁇ / 4 plate is formed by a liquid crystal cell. This has the advantage that the anisotropy of the plate is pure can be electronically "switched off”. The liquid crystal cell then becomes isotropic, i.e. H. the polarization of the incident Light wave is no longer rotated.
  • the processor can switch off the ⁇ / 4 plate between a correlation and a Fourier transform operation can be switched.
  • a filter can advantageously be arranged in the beam splitter be preferably from a reflective light modulator can be formed.
  • the Fourier optical processor 10 has a lighting device 11. This lighting device downstream there is a with a widened spatially coherent beam of light transmissive light modulator 12. At a distance of one focal length behind the light modulator 12 is a half Fourier lens 13 arranged. At the exit of the lens 13 there is a ⁇ / 4 plate, which is realized by a liquid crystal cell. 1, the ⁇ / 4 plate is anisotropic, i. H. a first, light beam 15 coming from the light modulator 12, the one non-polarizing as well as a polarizing beam splitter 16, 17 and then half the Fourier lens 13 has two passes through the ⁇ / 4 plate Rotated 90 ° in the direction of polarization.
  • the spread of the the first polarization direction 15 is shown in dashed lines, the spread of the rotated direction of polarization 18 dotted.
  • rotated beam 18 through half Fourier lens 13 becomes the beam 18 at that for the polarization direction now present reflective polarizing beam splitter 17 reflects and hits a filter 19 by one reflective light modulator is formed.
  • the light modulator can, for example, from a series connection of a transmissive light modulator and a mirror exist. After another reflection at the polarizing beam splitter 17 the light wave then hits the series circuit again from half Fourier lens 13 and ⁇ / 4 plate 14.
  • the processor 10 acts in the manner shown in FIG. 1 Works like a correlation system.
  • the ⁇ / 4 plate 14 in FIG. 2 is "switched off", d. H. the liquid crystal cell is isotropic, and the polarization of the incident light wave 15 is not turned.
  • the reflected light wave 22 passes through a second one Half the Fourier lens 13 and the polarizing beam splitter 17 before being connected to the non-polarizing beam splitter 16 reflected and captured by the CCD camera 21.
  • the Processor 10 according to FIG. 2 thus works like a 2f Fourier transformation system.

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  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Polarising Elements (AREA)
  • Length Measuring Devices By Optical Means (AREA)
EP98116147A 1997-09-11 1998-08-27 Procédé de traitement par transformation de Fourier de signaux optiques Withdrawn EP0902350A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19739835 1997-09-11
DE1997139835 DE19739835C2 (de) 1997-09-11 1997-09-11 Verfahren zur fourieroptischen Signalverarbeitung

Publications (1)

Publication Number Publication Date
EP0902350A1 true EP0902350A1 (fr) 1999-03-17

Family

ID=7841940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98116147A Withdrawn EP0902350A1 (fr) 1997-09-11 1998-08-27 Procédé de traitement par transformation de Fourier de signaux optiques

Country Status (2)

Country Link
EP (1) EP0902350A1 (fr)
DE (1) DE19739835C2 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002831A1 (fr) * 1982-02-12 1983-08-18 Fusek, Richard, Lee Appareil et procede de traitement optique holographique

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002831A1 (fr) * 1982-02-12 1983-08-18 Fusek, Richard, Lee Appareil et procede de traitement optique holographique

Also Published As

Publication number Publication date
DE19739835C2 (de) 1999-09-09
DE19739835A1 (de) 1999-04-08

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