公开(公告)号：WO1999026051A3

公开(公告)日：1999-05-27

申请号：PCT/US1998/021931

申请日：1998-10-20

Applicant: MOTOROLA INC.

Inventor： YOUNG, Daniel, A. ,  MOYA, Adam ,  KORIPELLA, Chowdary, R. ,  NABER, Jeffrey ,  ADAMS, Neil ,  MILLER, Adam ,  MARKYVECH, Craig

IPC: G01N27/26

Abstract: A calorimetric hydrocarbon gas sensor (10) includes an electrochemical oxygen pump (18), a sensing element (12), and a multi-layered substrate (26) separating the sensing element (12) from the electrochemical oxygen pump (18). The multi-layered substrate (26) includes a plurality of overlying insulating layers, in which at least one intermediate layer (60) supports a first primary heater (58), and in which another intermediate layer (52) supports a temperature compensation heater (50a, 50b). The primary heater (58) functions to maintain the calorimetric hydrocarbon gas sensor (10) at a constant, elevated temperature, while the active compensation heater (50a) functions to maintain substantially equal temperatures as determined by the thermometers (46a, 46b) located on an intermediate layer (48) overlying the compensation heaters (50a, 50b). Control circuitry is integrated with power measurement circuitry to measure differences in the heat produced by the compensation heater (50a) and the thermometer (46a) in an active region (100), and the heat produced by the compensation heater (50b) and the thermometer (46b) in a reference region (102).

公开(公告)号：EP0966661A1

公开(公告)日：1999-12-29

申请号：EP98952347.0

申请日：1998-10-20

Applicant: MOTOROLA, INC.

Inventor： YOUNG, Daniel, A. ,  MOYA, Adam ,  KORIPELLA, Chowdary, R. ,  NABER, Jeffrey ,  ADAMS, Neil ,  MILLER, Adam ,  MARKYVECH, Craig

IPC: G01N25 ,  G01N27

CPC classification number: G01N27/16 ,  G01N25/30 ,  G01N27/419

Abstract: A calorimetric hydrocarbon gas sensor (10) includes an electrochemical oxygen pump (18), a sensing element (12), and a multi-layered substrate (26) separating the sensing element (12) from the electrochemical oxygen pump (18). The multi-layered substrate (26) includes a plurality of overlying insulating layers, in which at least one intermediate layer (60) supports a first primary heater (58), and in which another intermediate layer (52) supports a temperature compensation heater (50a, 50b). The primary heater (58) functions to maintain the calorimetric hydrocarbon gas sensor (10) at a constant, elevated temperature, while the active compensation heater (50a) functions to maintain substantially equal temperatures as determined by the thermometers (46a, 46b) located on an intermediate layer (48) overlying the compensation heaters (50a, 50b). Control circuitry is integrated with power measurement circuitry to measure differences in the heat produced by the compensation heater (50a) and the thermometer (46a) in an active region (100), and the heat produced by the compensation heater (50b) and the thermometer (46b) in a reference region (102).