Optical sensor and helicopter blade torsion angle measuring method

The invention discloses an optical sensor and a helicopter blade torsion angle measuring method, and relates to the technical field of aviation test.The method comprises the following steps that the optical sensor is fixedly installed below the blade tip position of a helicopter blade, and visible light enters the optical sensor along a light sensing path; tTL level pulse signals generated when the blades pass through the light sensing path in the running state of the helicopter are collected, and the time interval of low level in the changing process of the TTL level pulse signals is obtained; and obtaining a proportion corresponding relational expression of the blade width and the time interval, and substituting the time interval into the proportion corresponding relational expression to obtain the blade torsion angle. According to the invention, the non-contact real-time online measurement of the blade torsion angle is realized by directly utilizing the blade to shield light above the optical sensor and ca