Signal Simulator Update V1 7 7-PLAZA |VERIFIED|

In the Version 1.1 update, a speed limit indicator was installed on the driver's HUD, which relays the speed limit to the driver of the train on the section of track they are driving on. About 2 months later, a signal indicator was installed on the driver's HUD, which tells the driver what the next signal will be. In February 2020, with the release of Version 1.4.1, new shunt signals were introduced at Faymere Green TMD. 2 white lights mean proceed and 2 red mean stop.

To simulate a different device, the free-boundary simulator parameters will need to be set appropriately. This includes the machine description with the locations and electrical properties of coils, vessel and limiter, the actuator and sensor characteristics, such as current and voltage ranges, noise and delay. Operational conditions such as the expected range of variation of profile parameters also need to be determined. Finally, rewards and targets need to be updated to match the geometry and desired shapes.

Framework of the proposed full-wavelength simulator of FD-OCT. Stage I: forward MC engine for obtaining the wavelength-dependent OPLs l(λ) and reflectance R(λ); Stage II: the probability distribution-based pre-processing for generating the photon-detected probability distribution Φ(l,λ) and the extended reflectance maps Rm(λ); Stage III: full-wavelength signal reconstruction procedure for rebuilding the A-line of FD-OCT with information from the entire spectrum.

For each simulation on the semi-infinite phantom, 200 million photon packets per wavelength are launched, which adds up to the same number of photons at the single wavelength as in the first simulation. In the case of the multi-layer phantom, 1 billion photon packets per wavelength are utilized. The photon-detected probability distributions Φ(l,λ) are derived in each simulation (presented as a fitted reflectance map). We later reconstruct the A-line signals from reflectance maps with Eq. (9) to show the imaging performance of the proposed simulator.

OPL-resolved reflectance map and normalized A-line signal for Phantom1 and Phantom2 by the proposed simulator. (a), (c) OPL-resolved reflectance map of Phantom1 and Phantom2. (b), (d) Normalized full-wavelength A-line signal of Phantom1 and Phantom2. The profiles at 1230 nm (blue), 1290 nm (red), and center wavelength 1260 nm (black) are extracted to show the variation along the OPL direction (right panels in (a) and (c)), while the profiles at 480 μm (blue) and 160 μm (red) are extracted to show the variation over wavelength (top panels in (a) and (c)). 2b1af7f3a8