Title:
【発明の名称】光ファイバー強度変調?ンサーに対する補償および状態モニ?リング・デバイス
Document Type and Number:
Japanese Patent JPH11505921
Kind Code:
A
Abstract:
Compensation and health monitoring techniques and devices for fiber optic intensity modulated sensors provide automatic adjustment of light intensity in order to maintain continuous calibration of the fiber optic sensors in the presence of undesirable environmental or handling conditions. These undesirable conditions may arise from such factors as fiber bending, optical connector mechanical and thermal instabilities, extreme temperatures at sensors, and changes in optical coupling between optical sources (e.g., light emitting diodes) and detectors (e.g., PIN photodiodes) and the optical fibers. Through light intensity normalization, the new techniques enable a continuous calibrated sensor output and sensor health monitoring by continuous or intermittent observation of the light emitting diode current.
Inventors:
Poor, Tooth, Jay.
Uro-, La-tea, Tee.
Uro-, La-tea, Tee.
Application Number:
JP53505296A
Publication Date:
May 25, 1999
Filing Date:
May 16, 1996
Export Citation:
Assignee:
Opiland, Inc. rated
International Classes:
G01D5/353; G01D21/00; G01J1/20; G01J1/42; G01L11/00; (IPC1-7): G01L11/02; G01D21/00; G01J1/20; G01J1/42
Attorney, Agent or Firm:
Ichiro Sugawara