Abstract:
Cleaning systems for optics of optical readers to periodically clean one or more surfaces of the optics of matter that may deposit on surface(s) and that might interfere with the performance of the reader. In an example, the cleaning system is used on a chemical indicator apparatus that includes one or more chemical indicators that are read by an optical reader having an optic. During use, the chemical indicator apparatus is moved relative optic during a reading mode. A cleaning element is engaged with the chemical indicator apparatus so as to have a neutral position in which it cannot contact the optic during the reading mode. When it is desired to clean the optic, the chemical indicator apparatus is moved in a manner that causes the cleaning element to move from the neutral position to a deployed position in which it contacts the optic in a manner that cleans the optic as the apparatus continues to be moved.
Abstract:
Compositions that include bis(glyoxime)-transition metal complexes bound to metal oxide solid supports are provided. In some embodiments the compositions include nickel dimethylglyoxime and the metal oxide supports can be alumina or silica. These compositions can be used to make a colorimetric moisture-indicating sensor that changes visible reflection spectrum quantitatively and reversibly according to the amount of moisture in contact with the sensor. Also provided is a method of detecting moisture using the provided compositions.
Abstract:
The present invention relates to a liquid crystal device for detecting interactions between a surface and an analyte. Specifically it provides a device for detecting interactions between a surface and an analyte, said device comprising a first substrate having an active surface supporting one or more first analyte(s), a second substrate, and a liquid crystal disposed on the active surface between the first substrate and second substrate, wherein the liquid crystal has a cross-section of varying thickness, wherein the cross-section of the liquid crystal has a first thickness and second thickness that is different to the first thickness, whereby the interaction between the active surface and the first analyte causes the orientation of the liquid crystal to change at a first critical thickness that is between the first and second thicknesses of the liquid crystal.
Abstract:
A sensing method, which comprises subjecting a holographic sensor to an external physical interaction to which the sensor is sensitive, and observing a change in the holographic image.
Abstract:
A device for detecting a compound in a sample includes a substrate and a self-assembled monolayer. The substrate includes a support with a metallized top surface, and the self-assembled monolayer includes an alkanethiol attached to the metallized top surface of the substrate and having a functional group that reversibly or irreversibly interacts with the compound. A liquid crystal is disposed on the self-assembled monolayer opposite the side of the self-assembled monolayer attached to the metallized top surface of the substrate. The liquid crystal includes a moiety that interacts with the functional group of the alkanethiol. When the compound is present in a sample that contacts the self-assembled monolayer, the orientation of the liquid crystal is altered.
Abstract:
A chemically sensitive sensor capable of detecting changes in concentrations of ions, atoms, or molecules in a fluid environment in which the sensor is immersed or embedded comprises a thin clad optical fiber, which is coated with a polymer which is permeable to liquids and which contains a chemically sensitive material, and a light carrying fiber. The polymeric material has the ability to change color and/or absorbance when the concentration of the ion, atom, or molecule in the surrounding environment changes. The polymer will return to its original color and/or absorbance state once the concentration goes back to the original value. The color change or absorbance is detected through the core of the optical fiber which is connected to a photodetector. The coupling of the light into the sensing structure is obtained by using a core-only optical fiber, surrounded by a clad material, in addition to an external light source. Coupling of the external light beam with the polymeric coated fiber is obtained through microbending losses in reverse by spooling the coated fiber around the clad material. Changes such as pH, metal or other ion concentration, organic molecule concentration, and gas molecule concentration may be detected.
Abstract:
Compositions that include bis(glyoxime)-transition metal complexes bound to metal oxide solid supports are provided. In some embodiments the compositions include nickel dimethylglyoxime and the metal oxide supports can be alumina or silica. These compositions can be used to make a colorimetric moisture-indicating sensor that changes visible reflection spectrum quantitatively and reversibly according to the amount of moisture in contact with the sensor. Also provided is a method of detecting moisture using the provided compositions.
Abstract:
Methods of assisting human users with dosing of aquatic environments, such as aquariums, pools, hot tubs, ponds, etc., that utilize automated monitoring systems that continually monitor various parameters of the water in the aquatic environments. When one or more measured water parameters of an aquatic environment are out of tolerance, a dosing calculator uses water-quality information from a monitoring system to generate dosing instructions for a human user that instruct the user how to dose the aquatic environment with one or more additives that will put the one or more parameters back into tolerance. In some embodiments, input from a user is used to switch the monitoring system to a dosing mode from a normal monitoring mode to track the progress of the dosing more closely than the normal monitoring mode would.
Abstract:
Photo-aging monitoring of light-based chemical indicators that experience performance degradation as the cumulative amount of light exposure from measurement and/or reference illumination increases from usage. Differing regions on a chemical indicator are illuminated with measurement illumination light of differing exposures, for example, higher brightness, longer exposure times, or both. Readings from the differing regions are compared with known aging information for the chemical indicator at issue to determine a confidence factor for the measurements. The confidence factor can be used to control various actions relating to measurements acquired from the chemical indicators, such as compensating measurement readings for photo-aging, assigning confidence levels to measurement readings, and issuing alerts to users when photo-aging exceeds one or more predetermined thresholds.
Abstract:
An aquatic environment monitoring system that includes chemical indicators that are dyes immobilized in an immobilizing medium, such as a hydrogel, and supported on a holder such that an optical reader may be used to illuminate the indicator dyes. The chemical indicator dyes include chemical indicator dyes that are sensitive for detecting calcium, magnesium, and carbon dioxide present in the aquatic environment.