A portable modular unit for inspecting in a timepiece the presence of a lubricating agent, or of an epilame, having fluorescent markers, from an excitation luminous flux of white light. The modular unit includes an optical housing, forming a first module, a portable white light source (200) emitting an excitation luminous flux, forming a second module, a portable magnifying device, forming a third module. The optical housing includes a first mounting interface for removably mounting the portable white light source on the optical housing, the first mounting interface being configured so that the excitation luminous flux emitted by the portable white light source is directed in the direction of the excitation filter; and a second mounting interface for removably mounting the portable magnifying device on the optical housing, the second mounting interface being configured so that the magnifying device is opposite the inspection opening.

A sensing device includes a first sensor configured to capture a first analyte in a fluid medium and to generate a first signal in response to capturing the first analyte. The sensing device also includes a second sensor configured to capture a second analyte in the fluid medium and to generate a second signal in response to capturing the second analyte, where the second analyte is different from the first analyte. The sensing device further includes a detector configured to collect the first and second signals to provide a total signal and to calculate a total concentration of the first and the second analyte in the fluid medium based on the total signal.

A process for detecting oil or lubricant contamination in the production of an article by adding a Stokes-shifting taggant to an oil or lubricant of a machine utilized to produce the article or a component thereof, irradiating the articles produced with a first wavelength of radiation, and monitoring the articles for emission of radiation at a second wavelength. The taggant can be in the form of a composition containing a Stokes-shifting taggant, which absorbs radiation at a first wavelength and emits radiation at a second wavelength, different from said first wavelength, dissolved or dispersed in an oil or lubricant.

An embodiment provides a method for measuring total chlorine in a seawater sample, including: preparing a thiocarbamate-based indicator; introducing the thiocarbamate-based indicator to a seawater sample, wherein the seawater sample contains an amount of total chlorine; adding an additive to the seawater sample, wherein the additive accelerates the reaction rate between the thiocarbamate-based indicator and total chlorine and causes a change in fluorescence of the seawater sample; and measuring the amount of total chlorine in the seawater sample by measuring an intensity of the fluorescence. Other aspects are described and claimed.

Systems and methods related to optical nanosensors comprising photoluminescent nanostructures are generally described.

A molecular detection apparatus of an embodiment includes: a first detector which includes a first sensor containing a MOF having a fluorescence emitting property, a light source which irradiates the MOF with light, and a light receiver which receives fluorescence from the MOF; a second detector which includes a sensor layer electrodes electrically connected with the sensor layer; and a type discrimination and concentration calculation part which discriminates a type of the molecules to be detected based on a measurement result measured by the first detector, and calculates a concentration of the molecules a measurement result measured by the second detector based on a discrimination result of a type of the molecules.

A photoluminescent material can be applied to part of a substrate as part of substrate inspection. The photoluminescent material includes a conjugated polymer having a coiled macroscopic molecular shape and a meta-linkage or an ortho-linkage. The substrate is imaged using an inspection system. The conjugated polymer can be, for example, poly(m-phenylene ethynylene) (PPE) or poly(para-phenylene vinylene) (PPV).

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 method for identifying an origin of Chrysanthemi flos is provided, which belongs to the technical field of chemical analysis and detection, and comprises the following steps: mixing Chrysanthemi flos extract with aluminum ion solution, and gold nano-clusters (AuNCs) solution in a solvent, standing for reaction, detecting fluorescence intensity of Chrysanthemi flos, comparing the fluorescence intensity of Chrysanthemi flos to be detected with that of Chrysanthemi flos from a target origin, and determining whether they are from a same origin. According to the application, excited-state intramolecular proton transfer effect between 3-hydroxyflavone derivatives of Chrysanthemi flos and aluminum ions is utilized to enhance the fluorescence of 3-hydroxyflavone derivatives, where AuNCs combines aluminum ions to enhance aggregation-induced fluorescence, and reacts with flavonoids to quench their fluorescence; and visual characterization and traceability of Chrysanthemum morifolium quality are achieved by further comparing obvious rich fluorescence color changes before and after the reaction.

A process for detecting oil or lubricant contamination in a manufactured product, the process comprising adding at least two fluorescent taggants to oils or lubricants contained in processing machinery for said product, irradiating said product, causing at least one of said taggants to fluoresce and detecting radiation emitted by said fluorescing taggant in an oil-contaminated product.