FIELD: transportation.
SUBSTANCE: indicator includes optical emitter mounted in the upper part of helicopter fuselage, which, via transmitting optical system, polariser, optically transparent heated emitter cap generates pulse emission at frequency of pulse oscillator connected to optical emitter. Pulse emission is modulated and synchronised using modulator and synchroniser which control pulse oscillator. Emission, reflecting from reflecting surface of propeller blade front edge, arrives on photoelectric detector input via optically transparent heated photoelectric detector cap. Polarisation plane of analyser is turned relative to polarising surface of polariser by the angle providing absence of emission passing through analyser when reflecting from clean surface of propeller blade. Input of signal processing unit is connected to output of photoelectric detector and output of signal processing unit is connected with input of icing indicator and input of anti-icing system control unit. The device allows to record with high accuracy the moments of icing process start and termination for helicopter lifting propeller blades.
EFFECT: increase of anti-icing systems operation efficiency and flight safety.
1 dwg
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