Table 1.
Config. | 1st Sensor Configuration | 2nd Sensor Configuration | 3rd Sensor Configuration | 4th Sensor Configuration |
---|---|---|---|---|
Light source (Laser) | 7 mW 650 nm |
30 mW 650 nm |
30 mW 650 nm |
20 mW 650 nm |
Optical fibers bundle | Multimode Øcore = 100 µm NA = 0.22 |
Scrambler + Multimode Øcore = 100 µm NA = 0.22 |
POF Øcore = 240 µm NA = 0.5 |
Single-mode illuminating fiber Øcore = 4.3 µm NA = 0.12 Multimode receiving fibers Øcore = 100 µm NA = 0.22 |
Photodetectors gain | Symmetric gain G1 = G2 = 0.75 × 104 V/A |
Asymmetric gain G1 = 0.75 × 105 V/A G2 = 2.38 × 105 V/A |
Asymmetric gain G1 = 0.75 × 105 V/A G2 = 2.38 × 105 V/A |
Asymmetric gain G1 = 0.75 × 105 V/A G2 = 2.38 × 105 V/A |
Calibration curve |
V2/V1 = −0.089d + 1.8783 |
V2/V1 = −0.2002d + 2.4578 |
V2/V1 = −0.213d + 5.0064 |
V2/V1 = −0.2167d + 3.8448 |
Cross section of the common leg | ||||
Laboratory precision | 141 µm | 51 µm | 33 µm | 24 µm |
Wind tunnel precision | 24 µm | - | 25 µm | 28 µm |