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# photonic thermometer illustration

## Appears In

                        - Detangling Light-based Thermometers with Combs

The working principle of this photonic thermometer. Scientists feed light of different wavelengths into a fiber optic cable with a Bragg grating etched inside of it. The grating allows only light of a certain wavelength to pass through it, depending on the temperature to which the grating is exposed. The other wavelengths of light are reflected back out of the fiber.

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