Resources Contact Us Home
Optical fiber sensor

Image Number 15 for United States Patent #8351029.

An objective of the present invention is to provide an optical fiber sensor which has a simple configuration to enable sensitively measuring a refractive index of a measurement medium in a wide range of refractive indexes. An optical fiber sensor according to the present invention includes; an optical fiber having a core in which a short-period gratings are formed and a cladding, the optical fiber being made so that transmission loss occurs due to cladding-propagation-mode leakage at its cladding portion where the short-period gratings are formed; a light source from which light having a wavelength range of the cladding propagation mode is emitted; and a light receiving unit for receiving transmission or reflection light having passed through the cladding at the position where the short-period gratings are formed. The optical fiber sensor detects, based on the total receiving light intensity that the light receiving unit receives, the refractive index of the measurement medium contacting the cladding, in which the optical fiber is multi-mode one, and the short-period gratings have plural kinds of periods.

  Recently Added Patents
Adaptive input interface
Insulated container sleeve
Mirror drift compensation in an optical circuit switch
Sensor coating
Information processing using batch setting information
Apparatus and method to simulate a power trip to a disk drive
Methods for forming patterned structures
  Randomly Featured Patents
Disposable female urine sample cup holder
Method of reducing viscosity in aqueous coal slurries by use of partial esters of polycarboxylic acids
Gas separating system and gas recovery system
Partial combustion burner with spiral-flow cooled face
Tunable, optical parametric oscillator
Front face of a vehicle wheel
Egg cracking device
Toy flying vehicle set
Gas analysis system for furnaces and the like