Optical Fiber Arrival-Time Sensor With Pressure Transducer
Original Publication Date: 1985-May-01
Included in the Prior Art Database: 2005-Feb-18
Arranging an optical fiber in the impact plane of a large number of linear actuators, such as print hammers, detecting the impact perturbation on transmitted light through the fiber, and contemporaneously detecting actuator force by a pressure transducer, provides measures of impact timing and pressure from which impact adjustments may be calculated. Fig. 1 shows an optical fiber arranged for impact by the mechanical actuators of an impact printer. Light is coupled into a fiber from an light-emitting diode (LED) or laser, and the transmitted light is detected in a photodetector. When the fiber is struck, a slight deformation of the fiber occurs and transmitted optical intensity is perturbed.