All-fiber spectroscopic optical sensor
First Claim
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1. An all-fiber spectroscopic optical sensor for analyzing a sample, the sensor comprising:
- a. a light source for producing an optical signal;
b. a sensor head where the optical signal interacts with the sample to produce an output spectrum;
c. a fiber acousto-optic tunable filter (FAOTF), in a path of the output spectrum, for selecting wavelength components from the output spectrum; and
d. one or more photo detectors for measuring said wavelength components.
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Abstract
A spectroscopic sensor apparatus based on an all optical fiber platform includes a light source, a sensor head, and a fiber acousto-optic tunable filter (FAOTF) based spectrometer. The target agent to be detected interacts with the optical field through the sensor head and produces an absorption or emission spectrum. The absorption or emission spectrum is then measured by the AOTF spectrometer to analyze the constituent of the target agent.
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Citations
20 Claims
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1. An all-fiber spectroscopic optical sensor for analyzing a sample, the sensor comprising:
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a. a light source for producing an optical signal;
b. a sensor head where the optical signal interacts with the sample to produce an output spectrum;
c. a fiber acousto-optic tunable filter (FAOTF), in a path of the output spectrum, for selecting wavelength components from the output spectrum; and
d. one or more photo detectors for measuring said wavelength components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An all-fiber spectroscopic optical sensor for analyzing a sample, comprising:
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a. a light source for producing a broadband optical signal;
b. a fiber acousto-optic tunable filter (FAOTF) for selecting wavelength components from the broadband optical signal;
c. a sensor head where the selected wavelength components of the optical signal interacts with the sample to produce an output optical signal; and
d. one or more photo detectors for measuring said output optical signal.
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20. A method for producing a fiber acousto-optic tunable filter, the method comprising:
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a. providing a base optical fiber with a dispersion property;
b. etching part of the base optical fiber to provide an un-etched portion and an etched portion, the etched portion having a smaller diameter than the un-etched portion;
c. coupling an acoustic transducer to the un-etched portion to apply an acoustic wave to the etched portion to produce a dynamic grating in the etched portion; and
d. coupling a photo detector to one end of the base optical fiber.
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Specification