Multi mode fibre perturber
First Claim
Patent Images
1. An optical arrangement for sensing a gas, said optical arrangement comprising:
- a quantum cascade chirped laser that outputs a wavelength chirp for providing a wavelength scan;
a multi-mode fiber positioned between said laser and a target area and having a first end optically coupled to said laser, wherein said multi-mode fiber is configured for transmitting light from the laser to and/or from the target area for sensing a gas located at the target area;
a randomizer adjacent said multi-mode fiber for randomizing spatial modes supported by the multi-mode fiber;
a detector spaced apart from said target area for detecting light emitted from a second end of said multi-mode fiber and that has passed through the target area, wherein said detector is configured to average out randomized spatial modes to recover a single spatial mode.
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Abstract
An optical arrangement comprising a multi-mode fiber (16) for carrying single mode laser light (12); a randomizer (18) for randomizing spatial modes supported by the fiber and means for averaging, out the randomized spatial modes to recover the single spatial mode.
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Citations
30 Claims
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1. An optical arrangement for sensing a gas, said optical arrangement comprising:
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a quantum cascade chirped laser that outputs a wavelength chirp for providing a wavelength scan; a multi-mode fiber positioned between said laser and a target area and having a first end optically coupled to said laser, wherein said multi-mode fiber is configured for transmitting light from the laser to and/or from the target area for sensing a gas located at the target area; a randomizer adjacent said multi-mode fiber for randomizing spatial modes supported by the multi-mode fiber; a detector spaced apart from said target area for detecting light emitted from a second end of said multi-mode fiber and that has passed through the target area, wherein said detector is configured to average out randomized spatial modes to recover a single spatial mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A gas sensor comprising:
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a quantum cascade chirped laser that outputs a wavelength chirp for providing a wavelength scan; a multi-mode fiber positioned between said laser and a target area and having a first end optically coupled to said laser, wherein said multi-mode fiber is configured for transmitting light from the laser to and/or from the target area for sensing a gas located at the target area; a randomizer adjacent said multi-mode fiber for randomizing spatial modes supported by the multi-mode fiber; a detector spaced apart from said target area for detecting light emitted from a second end of said multi-mode fiber and that has passed through the target area, wherein said detector is configured to average out randomized spatial modes to recover a single spatial mode. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for sensing a gas, said method comprising:
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transmitting light from a single mode laser, wherein the laser is a quantum cascade chirped laser that outputs a wavelength chirp for providing a wavelength scan; directing the light from the laser at a multi-mode fiber positioned between the laser and a target area and having a first end optically coupled to the laser, wherein the multi-mode fiber is configured for transmitting light from the laser to and/or from the target area for sensing a gas located at the target area; randomizing spatial modes supported by the multi-mode fiber using a randomizer adjacent said multi-mode fiber; and averaging out randomized spatial modes to recover a single spatial mode using a detector spaced apart from said target area for detecting light emitted from a second end of said multi-mode fiber and that has passed through the target area. - View Dependent Claims (30)
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Specification