A system for in-situ identification of a working fluid disposed in at least one piece of equipment, the system including: a working fluid reservoir that contains the working fluid; an in-situ sensor disposed in the working fluid reservoir such that it detects properties of the working fluid or computes properties from the generated spectra of the working fluid; a transmitter that transmits the detected spectra of the working fluid and equipment identification information; and a cloud computing system that receives the detected spectra and the equipment identification information transmitted from the transmitter, wherein the cloud computing system compares the spectra and equipment identification information against a reference database to determine whether or not the spectra of the working fluid substantially matches the stored reference spectra associated with the expected or specified fluid for the equipment.

A process for detecting oil or lubricant contamination in a manufactured product, the process comprising adding a fluorescent taggant to oils or lubricants contained in processing machinery for said product, conveying said product past an infrared detection apparatus, irradiating said product with infrared radiation from said detection apparatus as it passes the detection apparatus, and detecting infrared radiation emitted from said irradiated product.

A method of surface logging a well includes adding each of multiple polymeric taggants to a circulating drilling fluid in an addition sequence while drilling the well. Each polymeric taggant includes a polymer and a respective fluorescent dye having an emission wavelength or excitation wavelength different from that of each other fluorescent dye. The method includes taking a sample of drill cuttings carried by a drilling fluid while drilling a well, wherein the sample of drill cuttings includes polymeric taggants attached to the drill cuttings. The method includes extracting the dyes from the sample of drill cuttings into an extract solution; determining an indication of the type of and the concentration of each of the dyes in the extract solution; and determining a depth associated with the sample of drill cuttings based on the indication of the concentration of each of the dyes and on the addition sequence.

A detection device for detecting a marker in a liquid, preferably a fuel, comprising:

a reaction chamber 5, provided with a de-dopable conductive polymer 6 building a path between two conductive pads 10 connected to a resistivity measurement device, wherein the de-dopable conductive polymer 6 is able to be de-doped by a chemical reaction with the marker, changing its resistivity.

A detection device for detecting a marker in a liquid, comprising a reaction chamber, provided with a thermosensitive sensor, wherein said reaction chamber comprises an photopolymer capable of releasing or generating a chemical species that is capable of undergoing or initiating an exothermic or endothermic chemical reaction with a marker present in the liquid.

A gas chromatographic method for detecting a marker compound in a fuel by (a) introducing a sample of fuel into a first capillary column coated with a stationary phase based on polydimethylsiloxane and allowing the sample to flow through the first column to produce a first effluent; (b) allowing the first effluent to pass through a detector and identifying a retention time range in it which includes a retention time of the marker compound; (c) introducing only a portion of the first effluent stream which is within the retention time range into a second capillary column coated with either (i) an ionic sorbent or (ii) a polyethylene glycol, and allowing said portion to flow through the second capillary column to produce a second effluent stream; and (d) allowing the second effluent to pass through a detector; wherein the marker compound has formula Ar(R.sup.2).sub.m(OR.sup.1).sub.n and is present in the fuel at a level from 0.01 ppm to 100 ppm.

A method for the detection of adulterated gasoline in a sample is disclosed. The method includes contacting a sample with an immobilized molecular probe, the immobilized molecular probe having a photoluminescence which is environmentally sensitive; collecting the photoluminescence from the immobilized molecular probe; and determining whether the photoluminescence is indicative of adulterated gasoline. A test strip for the detection of adulterated gasoline in a sample is also disclosed, including an immobilized molecular probe embedded in a substrate and/or immobilized to the substrate, the immobilized molecular probe having photoluminescence which is environmentally sensitive to adulterated gasoline. The method and test strips are designed to be robust, portable, and within the capabilities of untrained personnel.

The present disclosure provides methods for identifying a hydrocarbon fuel, such as the presence and/or amounts of marker compounds having a fluorescence intensity and, through correlation, the presence and/or amounts of additive package(s) within the hydrocarbon fuel.

An oil filter may include a housing. The housing may include an inlet, an outlet, and a filter element. The filter element may be located downstream of the inlet and upstream of the outlet. Additionally, the filter element may include a filtering material and a tracer material.

The present invention relates to a process for preparation of metal free, nontoxic, hydrocarbon fuel compatible fluorescent carbon quantum dots (CQD), which act as marker as well as lubricity improver. CQDs are highly stable in non-polar hydrocarbons, at ppm level exhibit distinct fluorescent color upon irradiation with light of specific wavelength and exhibit distinct spectral properties compared to non-polar base hydrocarbons.