FIRIS™
Fiber-Optic Ratiometric System – The FIRIS™ system is a self-referencing, multi-channel fiber optic sensor interrogation system that uses light emitting diodes (LEDs) or laser diodes in the visible (active wavelength) and NIR (reference wavelength), and high-sensitivity photomultiplier tube (PMT) photodetectors, to monitor the colorimetric or fluorescence status of a fiber-optic sensing element. FIRIS Operational Mode: optical sensing fibers using a frequency modulated, dual wavelength, intensity ratiometric detection mode.
| Setting | Range | Resolution |
|---|---|---|
| No. of Detector Channels | 8 (active & reference) | N/A |
| LED Modulation frequency | From 1-kHz to 10-kHz | 0.1-kHz |
| LED or LD amplitude | 5% to 100% dynamic range | 5% |
| Integration Time | 0.1 to 60 s | 0.1 s |
| Settling Time | 1 to 1,000 ms | 1 ms |
| Photodetector gain | 5% to 100% Gain dynamic range | 5% |
| Digital Gain | 5% to 100% Gain dynamic range | 1% |
| Death Zone Time | 1 s to 30 minutes | 1s |
| Time in between measurements | ||
| Acquisition Frequency | 1 s to 30 minutes | 1 s |
| Photodetector (PMT) | 2 active & 2 reference | N/A |