G - Physics – 01 – B
Patent
G - Physics
01
B
G01B 9/02 (2006.01) G01D 5/26 (2006.01) G01K 11/32 (2006.01)
Patent
CA 2298693
Broadband energy incident on a transducer having partially or fully reflective surfaces separated by a gap which is greater than the coherence length of the broadband energy but smaller than one-half a coherence length of a band of energy within said broadband energy causes a portion of the spectral content of the broadband energy corresponding to a coherence length greater than twice the gap length to exhibit interference effects while the average power of the broadband energy remains unaffected. Splitting energy reflected from the transducer into two beams which are filtered at preferably similar center frequencies but with different pass bands yields beams which are radically different in sensitivity to changes in gap length. Analyzing the beams to derive a ratio of powers (since source intensity and fiber attenuation in a common fiber are thus self-cancelling) allows high accuracy and high resolution absolute measurement of temperature, pressure or strain.
L'énergie à large bande (110) incidente sur un transducteur (150) dotés de surfaces (221, 260) partiellement ou totalement réfléchissantes, séparées par un espace (g) de dimension supérieure à la longueur de cohérence de l'énergie à large bande (110) mais inférieure à une demi longueur de cohérence d'une bande d'énergie à l'intérieur des limites de ladite énergie à large bande (110), amène une partie du contenu spectral de l'énergie à large bande (110) correspondant à une longueur de cohérence supérieure à deux fois la longueur de l'espace, à présenter des effets d'interférence alors que la puissance moyenne de l'énergie à large bande reste inchangée.
Wang Anbo
Wang Jun
Xiao Hai
Zhao Wei
Macrae & Co.
Virginia Tech Intellectual Properties Inc.
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