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Priority to JP14473975ApriorityCriticalpatent/JPS5268433A/ja
Publication of JPS5268433ApublicationCriticalpatent/JPS5268433A/ja
Publication of JPS5753542B2publicationCriticalpatent/JPS5753542B2/ja
G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
G01P3/68—Devices characterised by the determination of the time taken to traverse a fixed distance using optical means, i.e. using infrared, visible, or ultraviolet light