Optical sensor and method for monitoring collision between upper-layer blades and lower-layer blades of coaxial dual-rotor helicopter

The invention discloses an optical sensor and a coaxial dual-rotor helicopter upper-layer and lower-layer blade collision monitoring method, and relates to the technical field of aviation testing, and the method comprises the following steps: two optical sensors are symmetrically and fixedly arranged on two inclined planes of a mounting platform respectively, the upper-layer paddle and the lower-layer paddle sequentially and respectively pass through light sensing paths of the two optical sensors during rotation; a plurality of TTL level pulse signals output by the two optical sensors in the stable operation state of the coaxial dual-rotor helicopter are collected; the blade tip distance between the upper-layer blade and the lower-layer blade is obtained through the multiple moment values; if the distance between the blade tips of the upper-layer blade and the lower-layer blade is smaller than a collision threshold value, early warning is conducted. According to the invention, an optical sensing domain formed