公开(公告)号：DE112004000756T5

公开(公告)日：2006-05-04

申请号：DE112004000756

申请日：2004-03-23

Applicant: ROSEMOUNT INC

Inventor： ROMO MARK GEORGE ,  WILLCOX CHARLES R ,  RUD JR STANLEY EDWARD

IPC: G02B6/35 ,  G02B6/26

Abstract: A variable optical attenuator has first waveguide and a second waveguide that are optically coupled together. At least one of the waveguides has a movable cantilever portion that is movable relative to the other to control attenuation of an optical signal traveling between the two. Preferably, electrically driven actuators deflect the movable waveguides to a relative position at which a desired optical attenuation value is achieved. Each movable waveguide may deflect in an opposite direction to the other waveguide. The electrically driven actuator receives a drive signal that controls the amount of deflection. The electrically driven actuator may be an electrostatic, electrothermic, or electromagnetic actuator. In the example of an electrostatic actuator, one electrode may be disposed on a movable waveguide and another adjacent the moveable waveguide to create the electrostatic force that moves the waveguide. The drive signal may be set to achieve a desired value for an electrical parameter that varies with the position of the movable waveguide. In some examples, the drive signal is set to achieve a desired capacitance or voltage difference between the movable waveguide and an electrode.

公开(公告)号：DK151080C

公开(公告)日：1988-05-09

申请号：DK20778

申请日：1978-01-16

Applicant: ROSEMOUNT INC

Inventor： RUD JR STANLEY EDWARD

IPC: G01L13/02 ,  G01L9/00 ,  G01L9/12 ,  G01L19/02 ,  G01L7/08

Abstract: A capacitance type differential pressure sensor which includes isolation diaphragms and incompressible fluid filling so that the sensing element does not have to be exposed to hostile fluids for pressure sensing and which isolation diaphragms are arranged in a manner to minimize sensitivity to acceleration forces encountered during use.

公开(公告)号：DK151080B

公开(公告)日：1987-10-26

申请号：DK20778

申请日：1978-01-16

Applicant: ROSEMOUNT INC

Inventor： RUD JR STANLEY EDWARD

IPC: G01L13/02 ,  G01L9/00 ,  G01L9/12 ,  G01L19/02 ,  G01L7/08

Abstract: A capacitance type differential pressure sensor which includes isolation diaphragms and incompressible fluid filling so that the sensing element does not have to be exposed to hostile fluids for pressure sensing and which isolation diaphragms are arranged in a manner to minimize sensitivity to acceleration forces encountered during use.