CALORIMETRIC HYDROCARBON GAS SENSOR

Title:

CALORIMETRIC HYDROCARBON GAS SENSOR

Document Type and Number:

WIPO Patent Application WO1999026051

Kind Code:

A3

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).

Inventors:

YOUNG DANIEL A
MOYA ADAM
KORIPELLA CHOWDARY R
NABER JEFFREY
ADAMS NEIL
MILLER ADAM
MARKYVECH CRAIG

Application Number:

PCT/US1998/021931

Publication Date:

March 20, 2003

Filing Date:

October 20, 1998

Export Citation:

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Assignee:

MOTOROLA INC (US)

International Classes:

G01N25/30; G01N25/36; G01N27/16; G01N27/419; (IPC1-7): G01N27/26

Foreign References:

US4541988A	1985-09-17
US5505837A	1996-04-09
US5250169A	1993-10-05

Other References: