Patent ID: 9557344
Date: 2017-01-31
CPC Classifications: G01F,G01P,G02B

Claim:
1. A sensor for measuring flow speed of a fluid, comprising: a light-absorbing optical fiber surrounded by a heat insulating material where the light absorbing fiber is heated to a predetermined temperature by light emitted into the light-absorbing optical fiber and loses heat to a fluid passing over the light-absorbing fiber and where the heat insulating material slows the rate of heat loss for extending the range of measurement of the fluid; and a fiber Bragg grating inscribed in the light-absorbing optical fiber wherein a central wavelength of the fiber Bragg grating shifts indicating a heat loss by the light-absorbing optical fiber and the fiber Bragg grating to the passing fluid that is indicative of a flow speed of the fluid passing over the light-absorbing optical fiber and the fiber Bragg grating.