Device for optical switching by fluid displacement and a device for the composition of a line of points

• US 4,818,052 A
• Filed: 04/21/1987
• Issued: 04/04/1989
• Est. Priority Date: 07/04/1983
• Status: Expired due to Fees

• Current Assignee: Thomson-CSF
• Original Assignee: Thomson-CSF
• Inventors: Le Pesant, Jean-Pierre, Perbet, Jean-Noel, Herriau, Jean-Pierre, Huignard, Jean-Pierre, Mourey, Bruno, Hareng, Michel
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Wise, Robert E.
• Application Number:
  US07/043,263
• Time in Patent Office: 714 Days
• Field of Search: 350/96.15, 350/267, 350/584, 250/573, 250/574, 250/575
• US Class Current: 385/17
• CPC Class Codes: G02B 26/004 based on a displacement or a deformation of a fluid
• CPC Class Codes: G02B 6/3522 the optical element enabling or impairing total internal reflection using evanescent coupling G02B6/3536
• CPC Class Codes: G02B 6/3538 based on displacement or deformation of a liquid controlling the intensity of light by displacement or deformation of a fluid in general G02B26/004; fluid-filled lens of variable focal length G02B3/14
• CPC Class Codes: G02B 6/355 1x2 switch, i.e. one input and a selectable single output of two possible outputs
• CPC Class Codes: G02B 6/357 Electrostatic force electrostatic forces controlling reflecting elements in general G02B26/0841

Abstract

In a device for switching a light beam, the conditions of propagation of the beam are modified locally under electric control by interposing on the beam path a fluid which modifies the conditions of refraction of the medium traversed by the beam.

Claims

1. A device for optically switching at least one incident optical beam between at least first and second exit paths comprising:

first and second fluids contained within a confinement space defined by a pair of transparent elements,

electrically controlled switching means for placing into a path of said incident optical beam either the first fluid for producing reflection of the optical beam into said first exit path or the second fluid which does not produce a reflection so that the optical beam travels over the second exit path, the first and second fluids being immiscible and having different dielectric permittivities, one of the fluids having a globular structure embedded in interstitial structure of the other fluid,

said electrically controlled switching means including means for generating an electric field gradient in order to cause the fluid having the higher permittivity to converge toward a region of the confinement space which is subjected to the electric field gradient,

wherein said first fluid is air and the second fluid is a hydrocarbon.

2. A device as recited in claim 1 wherein said second fluid is an alkane with 5 to 25 carbon atoms per molecule.

3. A device as recited in claim 1 wherein said second fluid is a ketone.

4. A device as recited in claim 1 wherein said second fluid is acetone.

5. A device as recited in claim 3 wherein said second fluid is cyclohexane.

6. A device as recited in claim 3 wherein said second fluid is methylethylketone.

7. A device as recited in claim 1 wherein said second fluid is a nitro derivative.

8. A device as recited in claim 1 wherein said switching means includes electrodes adjacent said transparent electrodes coated with a non-wettable coating.

9. A device as recited in claim 8 wherein said electrodes have an inter-engaging form.

10. A device for optically switching at least one incident optical beam between at least first and second exit paths comprising:

first and second fluids contained within a confinement space defined by a pair of transparent elements,

electrically controlled switching means for placing into a path of said incident optical beam either the first fluid for producing reflection of the optical beam into said first exit path or the second fluid which does not produce a reflection so that the optical beam travels over the second exit path, the first and second fluids being immiscible and having different dielectric permittivities, one of the fluids having a globular structure embedded in interstitial structure of the other fluid,

said electrically controlled switching means including means for generating an electric field gradient in order to cause the fluid having the higher permittivity to converge toward a region of the confinement space which is subjected to the electric field gradient,

wherein said switching means include electrodes adjacent said transparent elements, said electrodes coated on a surface not adjacent said transparent elements with a non-wettable coating.

11. A device as recited in claim 10 wherein said electrodes have inter-engaging form.

12. A device as recited in claim 11 wherein said second fluid is a hydrocarbon.

13. A device for optically switching at least one incident optical beam between at least first and second exit paths comprising:

first and second fluids contained within a confinement space defined by a pair of transparent elements,

electrically controlled switching means for placing into a path of said incident optical beam either the first fluid for producing reflection of the optical beam into said first exit path or the second fluid which does not produce a reflection so that the optical beam travels over the second exit path, the first and second fluids being immiscible and having different dielectric permittivities, one of the fluids having a globular structure embedded in interstitial structure of the other fluid,

said electrically controlled switching means including means for generating an electric field gradient in order to cause the fluid having the higher permittivity to converge toward a region of the confinement space which is subjected to the electric field gradient,

wherein said switching means includes electrodes adjacent said transparent elements having an inter-engaging form.

14. A device as recited in claim 13 wherein said electrodes have a non-wettable coating.

15. A device as recited in claim 13 wherein said second fluid is a hydrocarbon.

16. A device for optically switching plural incident optical beams between at least first and second exit paths for each incident beam, comprising:

first and second fluids contained within a confinement space defined by a pair of transparent elements,

electrically controlled switching means for placing into a path of each said incident optical beam either the first fluid for producing reflection of the optical beam into said first exit path or the second fluid which does not produce a reflection so that the optical beam travels over the second exit path, the first and second fluids being immiscible and having different dielectric permittivities, one of the fluids having a globular structure embedded in interstitial structure of the other fluid,

said electrically controlled switching means including means for generating an electric field greadient in order to cause the fluid having the higher permittivity to converge toward a region of the confinement space which is subjected to the electric field gradient,

wherein said switching means produces movement of said fluids in said confinement space in a direction defined by a plane within which said incident optical beams lie, and

wherein said second fluid is a hydrocarbon.

17. A device for optically switching plural incident optical beams between at least first and second exit paths for each incident beam, comprising:

first and second fluids contained within a confinement space defined by a pair of transparent elements,

electrically controlled switching means for placing into a path of each said incident optical beam either the first fluid for producing reflection of the optical beam into said first exit path or the second fluid which does not produce a reflection so that the optical beam travels over the second exit path, the first and second fluids being immiscible and having different dielectric permittivities, one of the fluids having a globular structure embedded in interstitial structure of the other fluid,

said electrically controlled switching means including means for generating an electric field gradient in order to cause the fluid having the higher permittivity to converge toward a region of the confinement space which is subjected to the electric field gradient,

wherein said switching means produces movement of said fluids in said confinement space in a direction defined by a plane within which said incident optical beams lie, and

wherein said switching means includes electrodes with a non-wettable coating.

18. A device for optically switching plural incident optical beams between at least first and second exit paths for each incident beam, comprising:

first and second fluids contained within a confinement space defined by a pair of transparent elements,

electrically controlled switching means for placing into a path of each said incident optical beam either the first fluid for producing reflection of the optical beam into said first exit path or the second fluid which does not produce a reflection so that the optical beam travels over the second exit path, the first and second fluids being immiscible and having different dielectric permittivites, one of the fluids having a globular structure embedded in interstitial structure of the other fluid,

said electrically controlled switching means including means for generating an electric field gradient in order to cause the fluid having the higher permittivity to converge toward a region of the confinement space which is subjected to the electric field gradient,

wherein said switching means produces movement of said fluids in said confinement space in a direction defined by a plane within which said incident optical beams lie, and wherein said switching means includes electrodes of inter-engaging form.