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2. Esophageal pH monitoring - Wikipedia

   en.wikipedia.org/wiki/Esophageal_pH_Monitoring

   Esophageal pH monitoring. In gastroenterology, esophageal pH monitoring is the current gold standard for diagnosis of gastroesophageal reflux disease (GERD). It provides direct physiologic measurement of acid in the esophagus and is the most objective method to document reflux disease, assess the severity of the disease and monitor the response ...

3. Photoionization detector - Wikipedia

   en.wikipedia.org/wiki/Photoionization_detector

   The photoionization detector is an efficient and inexpensive detector for many gas and vapor analytes. PIDs produce instantaneous readings, operate continuously, and are commonly used as detectors for gas chromatography or as hand-held portable instruments. Hand-held, battery-operated versions are widely used in military, industrial, and ...

4. pH meter - Wikipedia

   en.wikipedia.org/wiki/PH_meter

   Beckman model 72 pH meter, 1960. 781 pH/Ion Meter pH meter by Metrohm. A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [ 2] The pH meter measures the difference in electrical potential between a pH electrode and a reference electrode ...

5. ISFET - Wikipedia

   en.wikipedia.org/wiki/ISFET

   An ion-sensitive field-effect transistor ( ISFET) is a field-effect transistor used for measuring ion concentrations in solution; when the ion concentration (such as H +, see pH scale) changes, the current through the transistor will change accordingly. Here, the solution is used as the gate electrode. A voltage between substrate and oxide ...

6. Hydrogen sulfide sensor - Wikipedia

   en.wikipedia.org/wiki/Hydrogen_sulfide_sensor

   Hydrogen sulfide sensor. Hydrogen sulfide (H2S) is a noxious gas characterized by its distinctive stench reminiscent of rotten eggs. [1] It goes by several colloquial names, including sewer gas, stink damp, swamp gas, and manure gas. [2] This gas naturally occurs in crude petroleum, natural gas, hot springs, and certain food items.

7. Sensor fusion - Wikipedia

   en.wikipedia.org/wiki/Sensor_fusion

   Sensor fusion is the process of combining sensor data or data derived from disparate sources so that the resulting information has less uncertainty than would be possible if these sources were used individually. For instance, one could potentially obtain a more accurate location estimate of an indoor object by combining multiple data sources ...

8. Fiber-optic sensor - Wikipedia

   en.wikipedia.org/wiki/Fiber-optic_sensor

   Fiber-optic sensor. A fiber-optic sensor is a sensor that uses optical fiber either as the sensing element ("intrinsic sensors"), or as a means of relaying signals from a remote sensor to the electronics that process the signals ("extrinsic sensors"). Fibers have many uses in remote sensing.

9. Fluorescent glucose biosensor - Wikipedia

   en.wikipedia.org/wiki/Fluorescent_glucose_biosensor

   Despite the change in Fret of only 35% across the pathophysiological range (possibly 40% maximum change form no glucose to saturation), the sensor has been shown to decrease in functionality by only 20% after 450 days incubation at 37 °C (99 °F) and to monitor glucose as well as the Medtronic/Minimed CGMS sensor in animal models (mouse, pig ...