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US 6,951,127 B1Granted
Digital viscometer with non contact distance sensor
AssigneeHongfeng Bi
InventorHongfeng Bi
Life of this patent
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Abstract
Viscometer (80) with a sample cup (42) rotatable by a pulley (26) and a timing belt (30) to shear a tested fluid thus imparting torque to a bob (44) mounted on a shaft (10) supported via a frictionless bearing (58), an optical distance sensor assembly (12) measures the distance to an arm (70) which is connected to the top of shaft (10). This distance information is further converted to the viscosity of the tested fluid.
Claims18
Viscometer instrument comprising:
- (a) a rotor which is driven to rotate while contacting with a sample liquid to be measured,
- (b) means for driving said rotor to rotate,
- (c) a bob within said rotor,
- (d) means for suspending said bob therefor, said bob can rotate,
- (e) a member indirectly or directly connecting to a portion of said bob, and rotates together with said bob, and
- (f) means for sensing linear position of said member, and said means for sensing linear position has a characteristic of that when said means for sensing linear position is closer to said member, said means for sensing linear position output slope is steeper.
3 more elements
Viscometer instrument comprising:
- (a) a rotor which is driven to rotate while contacting with a sample liquid to be measured,
- (b) means for driving said rotor to rotate,
- (c) a bob within said rotor,
- (d) means for suspending said bob therefor, said bob can rotate,
- (e) a member indirectly or directly connecting to a portion of said bob, and rotates together with said bob, and
- (f) a laser optical distance sensor for sensing linear position of said member.
3 more elements
Dependencies are inferred from the claim text.