A method of quantifying the amount of glucose in a sample is provided herein that may further comprise an interferent such as mannitol. At least two measurements are obtained using measurement methods that differ in their sensitivity to the amount of interferent in the sample, thus enabling the results to be compared to determine whether any interferent is present in the sample. A glucose sensor for carrying out a method described herein is also provided

A system and method for detecting an analyte includes a waveguide configured to receive a narrow-band laser signal; and a sorbent material covering an analyte detection region of the waveguide, wherein the sorbent material is configured to sorb the analyte and bring the analyte to an evanescent field of the waveguide, and wherein Raman scattering is produced by an interaction of the evanescent field and the analyte sorbed in the sorbent material along the analyte detection region of the waveguide, and the waveguide is further configured to collect the Raman scattering along the analyte detection region of the waveguide, wherein the collected Raman scattering indicates a type of the analyte.

Herein disclosed are biosensing systems that measure lactose concentration in a solution.

A gas sensor configured to be discolored in response to a pH change upon reaction with a target gas, a refrigerator including the gas sensor, and a method of controlling the refrigerator includes a hydrogel support discolored through reaction with the target gas, and the hydrogel support includes dye provided to be discolored in response to a pH change upon reaction with the target gas.

An analyte indicator may include a porous base and may be included in an analyte sensor. The analyte indicator may retain its physical, chemical, and optical properties in the presence of compression. The porous base may not vary in opacity. The analyte indicator may include (i) a polymer unit attached or polymerized onto or out of the porous base and (ii) an analyte sensing element attached to the polymer unit or copolymerized with the polymer unit. The analyte sensing element may include one or more indicator molecule. The analyte sensing element may include one or more indicator polymer chains. The analyte indicator may include (i) an indicator polymer chain attached or polymerized onto or out of the porous base and (ii) indicator molecules attached to the indicator polymer chain.

The invention relates to an optical sensor element, comprising indicators, selected from luminescence-active means that are of the same type or different, and indicator protectors, and to a sensor, comprising at least one such sensor element, an energy source that excites the luminescence emission of the indicators, and a detector unit, wherein the sensor element or sensor is suitable for detecting molecular oxygen in a gaseous or liquid medium and/or for determining the molecular oxygen content of a gaseous or liquid medium and at least one layer of the sensor element bearing the indicator protectors is designed in such a way that the diffusion rate of the molecular oxygen formed on the indicator protectors by means of the reduction of strong oxidants back into the medium is greater than the diffusion rate of molecular oxygen from the medium in the direction of the at-least-one layer bearing the indicator molecules.

An apparatus for sensing a chemical of interest in a fluid of interest includes: a tube permeable to the chemical of interest, having a polymer, and configured to be disposed into the fluid of interest; and a reactant disposed in a hollow portion of the tube and configured to react with the chemical of interest causing a change to transmissiveness of light. The apparatus further includes: a light source configured to illuminate the reactant; a photodetector configured to detect light traversing the reactant; a processor coupled to the photodetector and configured to determine a rate of change of detected light in response to the chemical of interest reacting with the reactant in order to sense the chemical of interest; and a reactant purging system in fluid communication with the hollow portion and configured to purge out pre-existing reactant present in the hollow portion with new unreacted reactant.

A device for determining at least one condition parameter relating to a concentration or a partial pressure of an analyte in a gaseous medium, the device including at least one light source configured to emit light; at least one light receiver configured to detect the light; at least one optical sensor unit, and at least one temperature measuring device configured to measure a temperature of the optical sensor unit at least indirectly, wherein at least the light source, the light receiver and the temperature measuring device are arranged within a housing and at least the sensor unit is arranged outside of the housing, wherein at least one optical property of the sensor unit is a function of the condition parameter of the analyte, wherein light rays emitted by the sensor unit due to the sensor unit being irradiated by the light source are detectable by the light receiver.

Disclosed is a design for distributed optic fiber sensors and a corresponding method for sensing chemical concentrations with distributed fiber optic sensors, which utilizes segments of optical fiber which incorporate multiple sensing locations along the fiber. The distributed sensors incorporated into the optic fiber generate signals which are simultaneously detected and combined to produce a resultant signal with the effective optic fiber sensor length equal to that of the corresponding fiber segment.

An analyte indicator may include a porous base and may be included in an analyte sensor. The analyte indicator may retain its physical, chemical, and optical properties in the presence of compression. The porous base may not vary in opacity. The analyte indicator may include (i) a polymer unit attached or polymerized onto or out of the porous base and (ii) an analyte sensing element attached to the polymer unit or copolymerized with the polymer unit. The analyte sensing element may include one or more indicator molecule. The analyte sensing element may include one or more indicator polymer chains. The analyte indicator may include (i) an indicator polymer chain attached or polymerized onto or out of the porous base and (ii) indicator molecules attached to the indicator polymer chain.