A formaldehyde detecting device includes a formaldehyde detecting unit which includes a formaldehyde detecting layer, a diffusion restricting member and a concentration indicator. The formaldehyde detecting layer includes a formaldehyde detecting material that develops color when reacting with formaldehyde. The diffusion restricting member is disposed on the formaldehyde detecting layer and permits a restricted amount of formaldehyde to pass therethrough to react with the formaldehyde detecting material. Concentration of formaldehyde is determined based on a color change on the formaldehyde detecting layer, and is indicated by the concentration indicator.

Some embodiments described herein relate to a method that includes receiving an optical emission signal from a sensor disposed in a vessel. The vessel can be configured for an in vitro biological process (e.g., a bioreactor), and the emission signal can be received while the sensor is in contact with a biological matrix. The emission signal can be received by a reader that is disposed outside the vessel. At least one of a presence, quantity, or concentration of an analyte can be determined based on the emission signal. Similarly stated, the emission signal emitted by the sensor can be dependent on at least one of a presence, quantity, or concentration of the analyte. In some embodiments, the emission signal can be an optical signal emitted by a sensor in response to the sensor being excited by an excitation optical signal emitted by, for example, the reader.

The invention relates to a retroreflector able to be placed in contact with an environment, comprising, by way of constituent material, a material enabling a parameter of said environment to be picked up, said material modifying the optical transmission properties of the retroreflector when said parameter is present, said retroreflector being able to receive an incident light beam via a first face and to reemit a light beam via said first face.

A method is provided for degradation-compensated evaluation of detection signals of a sensor arrangement operating on the principle of luminescence quenching, which arrangement has a luminophore that degrades over time, an excitation radiation source, and at least one optical sensor. The luminophore radiates, in accordance with a response characteristic of the sensor arrangement, in reaction to irradiation with a predefined modulated excitation radiation and as a function of the extent of an interaction of the luminophore with a quencher substance that quenches the luminescence of the luminophore. A response radiation is detected by the at least one optical sensor. The sensor arrangement outputs a detected intensity value representing an intensity of the response radiation and a detected phase value representing a phase difference of the response radiation with respect to the modulation of the excitation radiation. A predetermined calibration value correlation is identified in consideration of the reference response characteristic.

A wearable pollutant indicator, methods of making and using same. The indicator includes a polymeric film substrate having a first side and a second side, an adhesive disposed on the first side of the substrate, and a readily understood user interface disposed on the second side of the substrate, wherein the user interface comprises a qualitative indicator of the accumulated exposure to incident airborne particulate pollution as sensed through the reaction of the transition metal oxides therein.

The device for detecting and/or determining the concentration of an analyte present in a tissue includes a sensor which is an optical fibre interferometer, and one interferometer arm being coated with an immobilised binding agent enabling selective binding of the analyte. The interferometer arm is mounted inside a guide enabling puncturing the tissue and performing an in situ measurement without the necessity to collect or prepare a sample. The guide is provided with a closed guide face, longitudinal perforations on sidewalls enabling the analyte to reach the binding agent, and an opening in the input end of the guide for introducing the interferometer with the arm into the guide. At the input end, the opening is sealed, enabling the isolation of the interior of the guide from the surroundings. The interferometer is mounted in a position in which the interferometer does not touch the inside walls of the guide.

Systems, indicator wipe product, and methods thereof used to detect the presence of cationic polymer residues on a surface are described. In various embodiments, the cationic polymer to be detected comprises a quaternary silane residual antimicrobial. The indicator wipe may comprise a woven, nonwoven, or double-knit fabric, cotton, functional cellulose, or open cell foam material substrate impregnated with an aqueous dye solution comprising a sulfonephthalein dye. The indicator wipe may be configured to differentiate between traditional monomer quaternary ammonium compounds and cationic polymers such as quaternary silane compounds used in residual antimicrobial coatings by color changes on the indicator wipe and by observing if cationic-dye complexes diffuse by chromatography on the indicator wipe.

A microfluidic sensor for the detection of analytes in objects includes a contact surface that may be attached to a surface of the object, an inlet hole in the contact surface for the entry of fluids emitted by the object, and a first reservoir which stores an ionic fluid in the form of a polymer matrix. The polymer matrix includes a reactive substance which changes colour when it enters into contact with the analytes of the fluids emitted by the object. It further includes at least one first microfluidic duct which connects the inlet hole to the first reservoir. A system for the detection of analytes, a method for the manufacture of the microfluidic sensor and the use of the microfluidic sensor for the detection of analytes in works of art are also related.

The disclosure is the only product of its kind with the potential to curb the spread of contagious aerosolized disease via widely accessible and versatile disc that complements the requirement for wearing a face mask. CODIS is uniquely designed to enhance the contact tracing process of infectious diseases and serves as a proactive medium for identifying disease exposure in real-time. The disclosed pathogen indicator device includes a reagent configured to trigger a chemical reaction based on an exposure to a predetermined pathogen. The disclosure also includes a mask substrate configured to receive the reagent on a front side and to bond therewith on a backside thereof. The disclosure further includes a seal for the substrate and the reagent, the seal configured to provide a prophylactic temporary protection from the predetermined pathogen.

Medical test cards for detecting analytes are provided including a substantially planar body, an analyte detection means, an opening feature, and an optical code. The analyte detection means is enclosed within the planar body and is configured to provide a colorimetric change when a portion of the analyte detection means is contacted with the analyte. The opening feature is configured to provide access to the analyte detection means and the optical code includes information identifying the analyte detection means. Uses of such medical test cards include accessing the analyte detection means enclosed within the planar body by using the opening feature and contacting the analyte detection means with the sample. The optical code is read using an imaging device to identify the analyte detection means and the analyte detection means is imaged following contact with the sample using the imaging device.