Heated ion current sensor for high temperatures

Details Heated ion current sensor for high temperatures Heated ion current sensor for high temperatures

1980-12-09

1983-06-21

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

324465, G01N 2712

Patent

active

043893732

ABSTRACT:
To guide gas to the electrode of a high temperature sensor, a substrate (1), for example of ceramic or ceramic-coated metal has electrodes (3, 4; 7, 8; 16, 17) applied thereto, for example in meander pattern, spaced from each other. A heater is applied to the substrate, either on the same side (FIGS. 2, 3) or on the backside (FIG. 1). Gas is guided to the electrodes by projecting ridges and posts (11, 12) to thereby prevent fouling of the electrodes by gas; the ridges and posts, additionally, can be protected by a cover (18) FIG. 3, thereover. The spacing 13 between the ridges and posts, and the cover, if provided, is so arranged that resonance chambers are formed which are resonant at the expected frequencies of, for example, engine knocking or unusual combustion conditions. Guiding the gas by the ridges and posts permits differential effects to be obtained by, selectively, polarizing the electrode to have the negative or positive electrode, respectively, adjacent the gas inlet to provide repulsion, or attraction effects on the gas, and thereby obtain either a differential pressure sensor, or sensor of maximum sensitivity.

REFERENCES:
patent: 3999947 (1976-12-01), Mihara et al.
patent: 4033169 (1977-07-01), Fujishiro et al.
patent: 4164539 (1979-08-01), Johnston
patent: 4193965 (1980-03-01), Cullingford et al.
patent: 4197089 (1980-04-01), Willis et al.
patent: 4223550 (1980-09-01), Takahama et al.
patent: 4241019 (1980-12-01), Nakatani et al.

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