| US 7,507,891 B2 | ||
| Fiber Bragg grating tuner | ||
| Kin Tak Lau, Kowloon (Hong Kong Special Administrative Region of the People's Republic of China, The); and Pou Man Lam, Kowloon (Hong Kong Special Administrative Region of the People's Republic of China, The) | ||
| Assigned to The Hong Kong Polytechnic University, Kowloon (Hong Kong Special Administrative Region of the People's Republic of China, The) | ||
| Filed on Mar. 21, 2007, as Appl. No. 11/723,555. | ||
| Prior Publication US 2008/0229905 A1, Sep. 25, 2008 | ||
| Int. Cl. G10G 7/02 (2006.01) | ||
| U.S. Cl. 84—454 [84/723; 385/7; 385/10] | 18 Claims |
| 1. An apparatus for tuning a stringed musical instrument, the apparatus comprising:
a fiber Bragg grating (FBG) recorded within a core of an optical fiber; and
a holding member connected to the optical fiber and removably connected to the instrument in which vibration of a string of
the instrument is transmitted to the optical fiber through the holding member;
wherein the transmitted vibration causes light reflected by the FBG to alter, the altered reflected light is converted into
a frequency that is compared to a predetermined frequency of a musical note to determine whether the musical instrument is
well-tuned.
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