Fiber optic diaphragm sensors for engine knock and misfire detection
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United States of America Patent
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Feb 21, 1995
Grant Date -
N/A
app pub date -
Jul 1, 1993
filing date -
Jul 1, 1993
priority date (Note) -
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Abstract
The modulation depth of a fiber optic diaphragm sensor is increased by tapering the tip end of the optical fiber or fiber bundle. In a second embodiment, the modulation depth is increased by mechanically leveraging the diaphragm movement relative to the tip end of the optical fiber or fiber bundle. In either embodiment, the operating temperature of the tip end of the optical fiber or fiber bundle can be reduced relative to the operating temperature of the diaphragm. Thus, the diaphragm sensor can be directly exposed to combustion temperatures in an internal combustion engine and advantageously the sensor can be embodied in a spark plug adjacent the electrodes.
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