Patent ID: 11920995
Assignee: KONGSBERG MARITIME AS
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 21:
22. A drive shaft monitoring system for monitoring twist or torque of a drive shaft having an exterior surface and extending in a longitudinal direction, comprising:
a first coded disc arranged on the exterior surface of the drive shaft at a first position;
a second coded disc arranged on the exterior surface of the drive shaft at a second position, the second position being at a predetermined distance from the first coded disc in the longitudinal direction of the drive shaft;
the first coded disc comprising first multiple slots or recesses evenly distributed in a circumferential direction with portions of the first coded disc arranged between the first multiple slots or recesses blocking passage of light;
the second coded disc comprising second multiple slots or recesses evenly distributed in a circumferential direction with portions of the second coded disc arranged between the second multiple slots or recesses blocking passage of light the first and second multiple slots or recesses enabling light to pass through and having a same configuration on each of the first and second coded discs;
at least two independent light sensor assemblies arranged in connection with the first slots or recesses of the first coded disc; and
at least two other independent light sensor assemblies arranged in connection with the second slots or recesses of the second coded disc.