A planar waveguide device (PWD) for interacting with a fluid (FLD) is disclosed, the planar waveguide device (PWD) comprising a waveguide layer (WGL) for supporting optical confinement, a coupling arrangement (CPA) for in-coupling and out-coupling of light into and from the waveguide layer (WGL), a fluid zone (FZN) for accommodating the fluid (FLD), a filter layer (FTL) arranged between the fluid zone (FZN) and the waveguide layer (WGL) in an interaction region (IAR) of the waveguide layer (WGL),
wherein the filter layer (FTL) comprises filter openings (FOP) arranged to allow the fluid (FLD) to interact with an evanescent field of light guided by the waveguide layer (WGL),
wherein the filter openings (FOP) are adapted to prevent particles (PAR) larger than a predefined size from interacting with said evanescent field,
wherein the filter openings (FOP) are arranged as line openings having their longitudinal direction in parallel with the direction of propagation (DOP) of light guided by the waveguide layer (WGL).

The present invention relates to a method for optically determining the concentration of a gas. The method includes using at least two luminescent dyes, the first being in-sensitive to the concentration of a gas with respect to the luminescence response (reference dye) and the second being sensitive to the concentration of a gas with respect to the luminescence response (indicator dye) the dyes show different luminescence decay times so that the resultant phase angle is indicative for the concentration of a gas, wherein the detected luminescent amplitude of the reference dye at a first moment in time is utilized to correct for sensitivity changes after the first moment.

Method and compositions using transition metal salts and/or ammonium chloride to liberate toxins and other molecules from cyanobacteria, useful for assaying for total cyanobacterial toxins in lakes, reservoirs and other waters.

A hydrogen sensor for detecting hydrogen in a fluid in physical contact with the sensor comprises a sensing element, a first protection layer, provided to prevent contact of the sensing element with a sensor poisoning gas in the fluid, wherein the first protection layer comprises PMMA. Further, a hydrogen detection system, an electrical device having such a system and a method for producing a sensor are provided.

The present disclosure relates to an optical measurement probe for the detection of measurement values correlating with a measurand of a measuring medium, including a probe housing having at least one immersion region structured to be immersed in the measuring medium, a radiation source arranged in the probe housing, a radiation receiver arranged in the probe housing, and an indicator chamber formed in the probe housing and sealed via a membrane arranged in the immersion region of the probe housing, wherein an indicator is contained in the indicator chamber, the indicator including an AIE-active substance dissolved in an indicator solution or in an indicator gel, which AIE-active substance is a substance formed from species, molecules, complexes or clusters whose luminescence efficiency is increased via formation of aggregates containing the species.

A continuous glucose monitoring system may include a hand-held monitor, a transmitter, an insulin pump, and an orthogonally redundant glucose sensor, which may comprise an optical glucose sensor and a non-optical glucose sensor. The former may be a fiber optical sensor, including a competitive glucose binding affinity assay with a glucose analog and a fluorophore-labeled glucose receptor, which is interrogated by an optical interrogating system, e.g., a stacked planar integrated optical system. The non-optical sensor may be an electrochemical sensor having a plurality of electrodes distributed along the length thereof. Proximal portions of the optical and electrochemical sensors may be housed inside the transmitter and operationally coupled with instrumentation for, e.g., receiving signals from the sensors, converting to respective glucose values, and communicating the glucose values. The sensors' distal portions may be inserted into a user's body via a single delivery needle and may be co-located inside the user's body.

The present disclosure relates to an electrochemical sensor for determining a measurand correlating with a concentration of an analyte in a measuring fluid, comprising: a sensor membrane designed to be in contact with the measuring fluid for detecting measured values of the measurand; a probe housing which has at least one immersion region designed for immersion into the measuring fluid, wherein the sensor membrane is arranged in the immersion region of the probe housing; and a measurement circuit which is at least partially contained in the probe housing and is designed to generate and output a measurement signal dependent on the measurand, wherein the sensor membrane contains an optically detectable substance for marking the sensor membrane.

A universal odor code system encodes an olfactory stimulus into olfactory receptor space as quantitative measures of responses by olfactory receptors, producing an odor code profile. A mapping function maps an odor code profile into a formula of elements that approximates or recreates an odor code profile of a target olfactory stimulus.

A freshness label structure includes a label structure and a sealing member. The label structure includes a base material and a phosphor layer. The phosphor layer includes an aggregation-induced phosphor fixed to the base material. The sealing member is impermeable to aqueous liquid, seals the freshness label structure, and includes a porous member impermeable to aqueous liquid and permeable to gas.

A sensor component for use in a system for measuring concentration of analytes in fluid in a fluid line comprises one or more sensing elements having an optical property that varies with the concentration of the analytes, and engages with the fluid line such that the sensing elements are exposed to the fluid. The sensor component comprises a connector connecting to one or more optical waveguides, and transmits light between the waveguides and the sensing elements. The sensor component comprises one or more of a sampling port configured to provide fluidic access to the fluid line, a data storage medium storing data representing information about the sensor component, and a reflective element. Where it comprises a reflective element, the sensor component transmits light between the waveguides and the reflective element on a separate optical path from an optical path between the waveguides and the sensing elements.