Compensation and status monitoring devices for fiber optic inten

Details Compensation and status monitoring devices for fiber optic inten Compensation and status monitoring devices for fiber optic inten

1995-05-16

1997-02-04

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214B, 25022716, G01J 120, H01J 516

Patent

active

056001258

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.

REFERENCES:
patent: 4644145 (1987-02-01), Gundner
patent: 4827116 (1989-05-01), Takagi et al.
patent: 5390546 (1995-02-01), Wlodarczyk
patent: 5421195 (1995-06-01), Wlodarczyk

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