Stony Brook University patents graphene oxide sensor for measuring dew point

Dew point – the temperature at which moisture in the air begins condensing on a surface – is considered a more reliable humidity metric than relative humidity, since it stays constant regardless of temperature changes. Chilled-mirror hygrometers, which cool a surface to find that exact condensation point, are regarded as the most accurate instruments for the job and are widely used in labs and industrial settings requiring precise, repeatable humidity control. However, these laboratory-grade instruments are notoriously expensive and can be temperamental in operation.

Researchers at Stony Brook University, part of the State University of New York (SUNY) system, have patented a new method for measuring dew point and detecting icing conditions using a graphene oxide film, offering a potentially far cheaper alternative to the expensive chilled-mirror hygrometers currently used for precision humidity measurement.Dew point – the temperature at which moisture in the air begins condensing on a surface – is considered a more reliable humidity metric than relative humidity, since it stays constant regardless of temperature changes. Chilled-mirror hygrometers, which cool a surface to find that exact condensation point, are regarded as the most accurate instruments for the job and are widely used in labs and industrial settings requiring precise, repeatable humidity control. However, these laboratory-grade instruments are notoriously expensive and can be temperamental in operation.

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