Table 4
Functional approximation of NI-CU fluence.
Channel | v | w | x | y | ɀ |
---|---|---|---|---|---|
A | –0.6124 | 0.3972 | 0.6266 | 0 | 0 |
B | –0.4845 | 0.1185 | 0.4277 | 0 | 0 |
C | –0.5032 | 0.4013 | 0.5918 | 0 | 0 |
D | –3.2184 | –6.2664 | 3.1285 | 0 | 0 |
E | –4.6130 | –0.8297 | 0.8376 | –0.00055 | 0.02771 |
Notes. Functional approximation of the measured NI-CU fluence, as function of current (I in mA) and pulse-width-modulation duty cycle (PWM in %) for all five LED channels. The fluence is the prediction per average NISP pixel and per photons per second. These ad-hoc models are of the form ƒ(v × I + w × PWM + x × I × PWM + y × I3 + ɀ × I2 × PWM), where v, w, x, y, and ɀ are fit parameters across the central part of the I and PWM parameter space. The last two terms are non-zero only for LED E. The resulting relations are shown in Fig. 11.
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