Abstract:
A ratiometric vapor sensor is described that includes a first sensor and a second sensor. The first sensor includes a first semiconductor component comprising a vapor-sensitive semiconducting organic compound, while the second sensor includes a second semiconductor component comprising a modified vapor-sensitive semiconducting organic compound including a modifying organic group. The ratiometric vapor sensor can be used to detect the presence of a vapor such as nitrogen dioxide, and determine the concentration of the vapor by comparing the outputs of electrodes connected to the first and second sensor.
Abstract:
A gas sensor including an adjustment unit having a conversion element for converting a gas component contained in exhaled breath introduced into a first chamber to a particular component, a sensor unit having a second chamber and including a detection element, a ceramic wiring board electrically connected to the detection element, and a single heater for heating the conversion element and the detection element. The ceramic wiring board has an opening, and a ceramic thin plate is stacked on the ceramic wiring board to cover the opening. The ceramic thin plate partially constitutes the adjustment unit and the sensor unit and separates the first chamber and the second chamber from each other. The adjustment unit, the sensor unit, and the heater are integrated in such a manner that the adjustment unit and the sensor unit are thermally coupled through the ceramic thin plate.
Abstract:
A gas sensor including a conversion section for converting NO contained in a gas under measurement to NO 2 , and a detection section for detecting NO 2 concentration in the gas under measurement after having passed through the conversion section. The conversion section includes a substrate portion which defines a flow passage for the gas under measurement, and a porous catalyst layer disposed on a surface of the substrate portion which converts NO to NO 2 . The flow passage has a hollow space in which the catalyst layer is not present and through which the gas under measurement flows. The catalyst layer has a thickness of 4 to 300 µm as measured between the substrate portion and an outermost surface of the catalyst layer, the outermost surface being exposed to the hollow space.
Abstract:
Verfahren zur Detektion von Stickoxiden in einem Gasgemisch, bei dem ein Gassensor verwendet wird, der einen Sauerstoffionenleiter und wenigstens zwei auf diesem angeordnete Elektroden umfasst, der Gassensor derart mit dem Gasgemisch in Verbindung gebracht wird, dass beide Elektroden mit dem Gasgemisch in Kontakt treten, während eines Polarisationszeitraums eine Polarisationsspannung oder ein Polarisationsstrom an die Elektroden angelegt wird, während eines auf den Polarisationszeitraum folgenden Depolarisationszeitraums der Strom oder die Spannung an den Elektroden gemessen wird, der Stickoxidgehalt im Gasgemisch aus der gemessenen Spannung bzw. dem gemessenen Strom bestimmt wird, der Polarisationszeitraum beendet wird, sobald seit Beginn des Polarisationszeitraums eine festlegbare Ladungsmenge geflossen ist.
Abstract:
A sensitive, compact detector measures total reactive nitrogen (NOy), as well as NO 2 , NO, and O 3 . In all channels, NO 2 is directly detected by laser diode based cavity ring-down spectroscopy (CRDS) at 405 nm. Ambient O 3 is converted to NO 2 in excess NO for the O 3 measurement channel. Likewise, ambient NO is converted to NO 2 in excess O 3 . Ambient NO y is thermally dissociated at 700C to form NO 2 or NO in a heated quartz inlet. Any NO present in ambient air or formed from thermal dissociation of other reactive nitrogen compounds is converted to NO 2 in excess O 3 after the thermal converter. The precision and accuracy of this instrument make it a versatile alternative to standard chemiluminescence-based NO y instruments.
Abstract:
A respiratory monitor is disclosed that includes features for conducting multiple pulmonary function tests in a single device and for detecting the presence of nitric oxide in exhaled breath. Also described is a mouthpiece that allows for separate inhalation and exhalation pathways and for filtering inhaled and exhaled breath for predetermined species prior to exhalation into the respiratory monitor. The monitor further allows for wired, wireless and network connectivity and for cloud-based systems for communicating and correlating pulmonary data as well as relevant environmental data and displaying the data for use by patients and health care professionals.
Abstract:
A device for signal processing. The device includes a signal generator, a signal detector, and a processor. The signal generator generates an original waveform. The signal detector detects an affected waveform. The processor is coupled to the signal detector. The processor receives the affected waveform from the signal detector. The processor also compares at least one portion of the affected waveform with the original waveform. The processor also determines a difference between the affected waveform and the original waveform. The processor also determines a value corresponding to a unique portion of the determined difference between the original and affected waveforms. The processor also outputs the determined value.
Abstract:
The present disclosure provides improved sensor assemblies for gases. More particularly, the present disclosure provides for gas sensor assemblies operating at high temperature. Improved high temperature sensor assemblies for reducing gas are provided. In some embodiments, the present disclosure provides advantageous impedancemetric high temperature gas sensor assemblies based on electrospun nanofibers and having selectivity towards reducing gas, and related methods of use. In exemplary embodiments, the present disclosure provides for impedancemetric high temperature gas sensor assemblies having selectivity towards reducing gas. In certain embodiments, the sensor assembly includes electrospun nanofibers. Impedancemetric techniques have been employed at high operating frequency (e.g., 10 5 Hz) for the first time to provide real-time assemblies, methods and devices to sensitively and/or selectively detect reducing gas (e.g., CO, C 3 H 8 (propane), etc.) at high temperatures (e.g., at about 800°C).