| 摘要 |
<p>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 mechanic and thermal instabilities, extreme temperatures at sensors, and changes in optical coupling between optical sources (10) (e.g., light emitting diodes) and detectors (12) (e.g. pin photodiodes) and optical fibers. Through light intensity normalization, the new technique enables a continuous calibrated sensor output and sensor health monitoring by continuous or intermittent observation of the light emitting diode current.</p> |
