Title:
VIBRATION SENSOR
Document Type and Number:
Japanese Patent JP3136308
Kind Code:
B2
Abstract:
PURPOSE: To obtain a vibration sensor which can respond to a physical stress caused by pressure or acceleration.
CONSTITUTION: A vibration sensor incorporates a long element 18 which is arranged so that the element 18 can vibrate at a certain frequency depending upon an external stress applied to the sensor and an optical fiber 15 which couples light to the end section of the element 18 so that the light can excite the element 18 to vibrate. A light absorbing layer 19 is provided on the longitudinal surface of the element 18 so that the constitution of the element 18 can be changed (by, for example, bending) when the layer 19 absorbs light and heats the element 18 from the side of the layer 19. When the constitution of the element 18 changes, the element 18 is restored, because the change reduces the quantity of absorbed radiation. The element 18 can specify a Fabry-Perot interferometer between its both ends.
Inventors:
Alan James Cook
Robert Andrew Pinnock
Robert Andrew Pinnock
Application Number:
JP6286692A
Publication Date:
February 19, 2001
Filing Date:
March 19, 1992
Export Citation:
Assignee:
Bookham Technology plc
International Classes:
G01L1/00; G01L1/10; G01L1/18; G01L9/00; G01P15/097; G01P15/10; G10K15/04; (IPC1-7): G01L1/10; G01L9/00
Domestic Patent References:
| JP63289430A | ||||
| JP60170723A | ||||
| JP5730921A | ||||
| JP2176533A |
Attorney, Agent or Firm:
Fukami Hisaro (3 outside)