AIR INTAKE SCREEN DEBRIS SENSING

An air intake screen debris cleaning system may include an intake screen through which air is drawn in a first direction for cooling, a reverse airflow generation system to create a reverse airflow ina second direction opposite the first direction to clear debris from the intake screen, a sensor to sense debris that is collected on the intake screen and a controller to activate the reverse airflow generation system based upon signals from the sensor. In one implementation, the sensor comprises an emitter to emit a sensor beam that extends along a face of the air intake screen and which does not intersect or pass through the air intake screen prior to being sensed. 进气滤网碎屑清洁系统可包括：进气滤网，空气在第一方向上通过该进气滤网被吸入以用于冷却；反向气流产生系统，该反向气流产生系统用于在与第一方向相反的第二方向上产生反向气流，以从进气滤网上清除碎屑；传感器，该传感器用于感测在进气滤网上收集的碎屑；以及控制器，该控制器用于基于来自传感器的信号致动反向气流产生系统。在一种实施方式中，传感器包括发射器，该发射器发射传感器束，该传感器束沿着进气滤网的面延伸，并且该传感器束在被感测之前不与进气滤网相交或穿过进气滤网。