A system for indicating content within a fluid container provides an improved fuel container for mixed fuel, which indicates its contents to a user. The system communicates whether there is oil, gas, a mixture of the two, or nothing inside the container. When the system is filled with gas only, the color of the can will change to, or otherwise remain, a first color. Similarly, oil alone would be indicated by a unique color. When a user combines oil and gas, the system changes to a new color to let the user know that oil is indeed inside the receptacle of the apparatus. Alternatively, the system may provide a nozzle equipped with the same color-indicating capabilities as the fuel receptacle embodiment. For example, when oil is mixed with gas inside the system, the nozzle may turn blue to ensure that a user is aware of the change of contents.

A method of forming a sensor includes providing a substrate, forming a polymer aerogel layer on the substrate, and infusing the polymer aerogel layer with sensing molecules.

A diagnostic device for analysing properties of an analyte in a sample liquid including: a distribution zone having at least two hydrophilic layers placed one on top of the other, wherein one layer is a top layer (12) and the other is a bottom layer (13); and a detection zone located under the distribution zone, the detection zone having a detection layer (14), wherein: the top layer has one or more openings (15) through which the sample liquid is introduced into the device; the bottom layer having one or more openings (16) connecting the distribution zone to the detection zone; the bottom layer also having a means by which the sample liquid is distributed from the top layer's opening to the detection layer through the bottom layer's opening; and a visual indication results on the detection layer when the sample liquid comes into contact with the detection layer.

The invention relates to a polymer matrix for optical sensing of pH and/or carbon dioxide, and a process for producing the polymer matrix. Also discussed is an optical sensor for optical sensing of pH and/or carbon dioxide comprising the polymer matrix of the invention, and a method for making the optical sensor. The invention further provides a method of measuring the pH and/or the carbon dioxide content of a sample, using the sensor of the invention. The optical sensor is useful in measuring the pH and/or the carbon dioxide content of biological samples such as blood.

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 sensor has a transparent polymer aerogel, and sensing materials dispersed into the transparent, polymer aerogel, where the sensing materials change color in response to environmental conditions. A method of forming a sensor includes providing a substrate, forming a polymer aerogel layer on the substrate, and infusing the polymer aerogel layer with sensing molecules.

Described herein are devices for determining or monitoring the quality of a food product. In one aspect, the devices comprise a pH-sensitive film incorporated within a quick response code, wherein the pH-sensitive film is positioned to be in contact with the food product. The pH-sensitive film produces different colors subject to changes in pH of the food product. The color produced by the pH-sensitive film can then be correlated to the quality of the food product. The quick response code can provide additional information regarding the food product.

A device for providing a food advertisement based on food flavors to market a food product, including a carrier and a plurality of color patches provided on the carrier and combined into a color pattern. The color patches are generated according to a colorimetric sensor array sensing the food product, and the colorimetric sensor array includes a plurality of sensing materials for sensing the food product. The sensing materials respectively react with at least one metabolic molecule of the food to change from an initial color to an indication color corresponding to the color patches respectively, so that the color pattern is visually associated with flavor information of the food product correspondingly.

The present invention relates to testing biological or industrial samples. Disclosed by preferred embodiments is an electronic assay test reader for reading a lateral flow test strip having a development area comprising a test background region and at least one test result line, the electronic lateral flow assay test reader comprising: a cassette for retaining the test strip and a carrier adapted to removably retain the cassette therein; at least one illumination LED operably associated with one or a combination of the cassette and the carrier for illuminating the test strip, and; a light guide comprising a window structure of one or a combination of the cassette and the carrier to direct light emitted or reflected from a selected portion of the development area of the test strip to a sensor wherein the proportion of the at least one test result line relative to the proportion of test background region in the selected portion of the development area of the test strip is maximised

A sensor (e.g., an optical sensor) that may be implanted within a living animal (e.g., a human) and may be used to measure an analyte (e.g., glucose or oxygen) in a medium (e.g., interstitial fluid, blood, or intraperitoneal fluid) within the animal. The sensor may include a sensor substrate, electrode or housing, an analyte indicator covering at least a portion of the sensor, and one or more compounds that reduce degradation of the analyte indicator.