A system for detecting spark in an igniter for a gas turbine engine. An
igniter generates a plasma, or spark, somewhat similar to an automotive
spark plug. In the invention, an inductive pick-up is positioned adjacent
the igniter, to detect current pulses in the igniter, to thereby infer
the presence of spark. The Inventors have found that this approach is
effective, despite the fact that the inductor is surrounded by grounded
shielding intended to suppress rf interference, and to protect personnel
from high voltages present. The shielding is intended to block the very
signals which the invention detects.