Mass Airflow Sensor
Mass Airflow Sensor - Related Videos
09:14
Glovebox and Impurity Sensors
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Source: Tamara M. Powers, Department of Chemistry, Texas A&M University The glovebox provides a straightforward means to handle air- and moisture-sensitive solids and liquids. The glovebox is what it sounds like: a box with gloves attached to one or more sides, which allows the user to perform manipulations within the glovebox under an inert atmosphere. For manipulations under inert atmospheres, chemists can choose between Schlenk or high-vacuum techniques and a glovebox. Schlenk and...
09:30
Bacterial Detection & Identification Using Electrochemical Sensors
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Cited by 6 •
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We describe an electrochemical sensor assay method for rapid bacterial detection and identification. The assay involves a sensor array functionalized with DNA oligonucleotide capture probes for ribosomal RNA (rRNA) species-specific sequences. Sandwich hybridization of target rRNA with the capture probe and a horseradish peroxidase-linked DNA oligonucleotide detector probe produces a measurable amperometric current.
10:23
Glutamine Flux Imaging Using Genetically Encoded Sensors
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Cited by 7 •
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05:15
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11:04
Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS)
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Cited by 2 •
2011
Quantitative, high-throughput, real-time, and label-free biomolecular detection (DNA, protein, etc.) on SiO2 surfaces can be achieved using a simple interferometric technique which relies on LED illumination, minimal optical components, and a camera. The Interferometric Reflectance Imaging Sensor (IRIS) is inexpensive, simple to use, and amenable to microarray formats.
FAQs
As air passes over the heated element, it removes heat and tends to lower the element’s temperature. The feedback circuit responds by supplying additional electrical current to restore the preset temperature. Because the required current changes with the heat removed by the moving air, the electronics use that value as an indication of the incoming air mass.
A fixed operating temperature gives the sensor a stable reference for interpreting cooling. Instead of measuring an uncontrolled temperature change, the circuit tracks how much electrical input is needed to counteract heat loss and hold the element at its set point. This relationship makes the output responsive to changes in air entering the engine.
Combustion control depends on how much air is available to react with injected fuel, not merely on an unqualified indication that air is moving. A mass-related signal supplies the engine control unit with information used to adjust fuel injection for an appropriate air-to-fuel ratio. That adjustment supports more controlled fuel oxidation and fewer incomplete-combustion products.
Its measurement helps regulate the reactant balance during fuel combustion. When fuel injection is adjusted to the incoming air mass, the engine can better support efficient oxidation and reduce products associated with incomplete combustion. The resulting combustion information also helps optimize catalytic-converter performance, connecting electrical sensing with downstream chemical emissions control.
The process begins when incoming air cools the heated sensing element. The feedback circuit increases electrical input as needed to restore the set temperature, and the resulting current provides the airflow-related measurement. The engine control unit then uses that information to adjust fuel injection, linking the sensor response to combustion management.
Accurate measurement gives the control system a dependable basis for matching fuel delivery to the air entering the engine. Better matching supports an appropriate air-to-fuel ratio, which can promote more efficient oxidation and reduce incomplete-combustion products. In the broader emissions system, this information contributes to effective catalytic-converter operation rather than serving only as a standalone electrical reading.