I have not heard of using modern techniques such as those in the
automotive industry to control rocket engine combustion.
It occurs to me that if we want to have complete control over our
engines performance we need this same control over the combustion
process.
This would be especially useful for a preburnner system that
reintroduces the turbine gasses into the main rocket combustion chamber.
I'm wondering if anyone on arocket has heard of a combustion sensor
much like the O2 sensor in automotive use used to detect oxidizer/fuel
ratio in the exhaust gases?