High Speed Chemical Vapor Communication Using Photoionization Detectors

摘要

We consider data transfer between a chemical vapor emitter and photoionization detectors (PIDs) under constant velocity gas flow in a constrained environment (flow tube). We show that the system, though stochastic owing to flow unsteadiness, is (on average) linear and then characterize the channel using a Karhunen-Loeve (KL) expansion. We measure bit error rates using straightforward detection methods in the KL-produced signal space. Data rates of 20bps are easily achieved at ≈ 10^{-3 error rate and we suspect that similarly low error rates are achievable at much higher bit rates using suitable adaptive equalization methods.}