公开(公告)号：BR8707718A

公开(公告)日：1989-08-15

申请号：BR8707718

申请日：1987-06-01

Applicant: ROSEMOUNT INC

Inventor： KNECHT THOMAS A ,  RUF JAMES ,  SCHULTE JOHN P

IPC: G01L9/04 ,  G01L7/08 ,  G01L9/00 ,  G01L19/00 ,  G01L19/10

公开(公告)号：FI884562A0

公开(公告)日：1988-10-04

申请号：FI884562

申请日：1988-10-04

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01R20060101 ,  G01R11/52 ,  G01R27/26 ,  G01R29/24 ,  G01R

Abstract: A measurement circuit (10) provides an output signal as a function of an input signal. The measurement circuit includes a charge generator (18) which provides packets of charge as a function of the input signal to a measurement element (34). The measurement element (34) measures the charge provided and provides a measurement signal as a function of the charge received. The measurement signal (28) is coupled to a feedback circuit (9) which couples to switches in the charge generator (18) to control production of charge packets. The feedback circuit (9) provides at least one output signal indicative of the quantity or number of charge packets provided.

公开(公告)号：CA1235922A

公开(公告)日：1988-05-03

申请号：CA492378

申请日：1985-10-07

Applicant: ROSEMOUNT INC

Inventor： KNECHT THOMAS A ,  FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01L9/00 ,  H01G5/16 ,  H01G7/00 ,  G01L7/08

Abstract: PRESSURE SENSING CELL USING BRITTLE DIAPHARGM A capacitive sensing cell is adapted for manufacture in a batch process, and uses a substrate or base from a rigid insulating material such as glass and a diaphragm assembly of a brittle semiconductor. The diaphragm assembly and the substrate are anodically bonded together. A very shallow recess is formed on either the diaphragm or the substrate to accommodate a deposited capacitor plate. Two such assemblies are connected together and the assembly is filled with noncompressible fluid to slightly bow the diaphragms away from the substrates. Differential pressure between the diaphragm assemblies is sensed by detecting the relative positions of the two diaphragms.

公开(公告)号：NO881169L

公开(公告)日：1988-03-16

申请号：NO881169

申请日：1988-03-16

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01D5/12 ,  G01D5/24 ,  G01R27/26 ,  G01R ,  G01L

Abstract: A transmitter provides an output representative of a parameter. A generating circuit in the transmitter senses the parameter and provides charge packets having adjustable magnitudes to a measurement circuit. The measurement circuit measures the quantity of charge and provides a measurement signal representing the charge to a feedback circuit. The feedback circuit is controlled by the measurement signal and provides timed feedback signals to the generating means. The feedback signals control the generation and magnitude of the charge packets such that the charge coupled to the measurement circuit is finely balanced in a short measurement interval. The feedback means counts the number of charge packets provided during a measurement interval such that the numbers counted are representative of the sensed parameter.

公开(公告)号：NO875401L

公开(公告)日：1987-12-22

申请号：NO875401

申请日：1987-12-22

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01R20060101 ,  G01R11/52 ,  G01R27/26 ,  G01R29/24 ,  G01R

Abstract: A measurement circuit (10) provides an output signal as a function of an input signal. The measurement circuit includes a charge generator (18) which provides packets of charge as a function of the input signal to a measurement element (34). The measurement element (34) measures the charge provided and provides a measurement signal as a function of the charge received. The measurement signal (28) is coupled to a feedback circuit (9) which couples to switches in the charge generator (18) to control production of charge packets. The feedback circuit (9) provides at least one output signal indicative of the quantity or number of charge packets provided.

公开(公告)号：NO875401D0

公开(公告)日：1987-12-22

申请号：NO875401

申请日：1987-12-22

Applicant: ROSEMOUNT INC

Inventor： FRICK ROGER L ,  SCHULTE JOHN P

IPC: G01L9/12 ,  G01R20060101 ,  G01R11/52 ,  G01R27/26 ,  G01R29/24 ,  G01R

Abstract: A measurement circuit (10) provides an output signal as a function of an input signal. The measurement circuit includes a charge generator (18) which provides packets of charge as a function of the input signal to a measurement element (34). The measurement element (34) measures the charge provided and provides a measurement signal as a function of the charge received. The measurement signal (28) is coupled to a feedback circuit (9) which couples to switches in the charge generator (18) to control production of charge packets. The feedback circuit (9) provides at least one output signal indicative of the quantity or number of charge packets provided.