CPC Subgroup
G01P 3/64 Devices characterised by the determination of the time taken to traverse a fixed distance
Full Title
Measuring linear or angular speed; Measuring differences of linear or angular speeds (G01P5/00 - G01P11/00 take precedence; ; counting mechanisms G06M) > Devices characterised by the determination of the time taken to traverse a fixed distance
3 direct subcodes
Child Classifications
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- G01P 3/66 using electric or magnetic means (G01P3/80 takes precedence; measuring short time intervals G04F8/00, G04F10/00)
- G01P 3/68 using optical means, i.e. using infrared, visible, or ultraviolet light (G01P3/80 takes precedence )
- G01P 3/80 using auto-correlation or cross-correlation detection means