| 摘要 |
<p>The optical fiber sensor solves the problem of implementing a pressure sensor, which is no wider than the standard optical fiber, this is 125 micrometer. The key element of the sensor is an elastic diaphragm, which is located inside the cavity at the end of the optical fiber. The measurement of the flexion of the diaphragm or pressure is based on the phenomena of interference of light between the diaphragm and the end of the optical fiber. The procedure of manufacture includes the etching of the end of the optical fiber and implementation of the diaphragm. A short section of a multimode optical fiber with a core having been etched by immersion into HF acid, is welded to the end of the monomode optical fiber. The thus provided end of the optical fiber is immersed into a solution of material, suitable for the manufacture of the diaphragm, dissolved in a suitable solvent. After withdrawal of the fiber from the solution a part of the solution in the shape of a droplet sticks to the fiber where as a result of evaporation it gradually becomes thinner. This way a thin diaphragm is created inside the recess at the end of the optical fiber.</p> |
