The invention relates to a colorimetric gas detector for determining and monitoring gaseous substances. The colorimetric gas detector can be used in any application requiring the detection of substances in a gaseous environment. The colorimetric gas detector has a photodetector, a light source positioned opposite to the photodetector, and a receiving slot for positioning a colorimetric media between the camera and the light source.

The glass panel unit includes: a first glass panel; a second glass panel; a seal; an evacuated space; and a gas adsorbent. The seal with a frame shape hermetically bonds the first glass panel and the second glass panel to each other. The gas adsorbent is placed in the evacuated space. The gas adsorbent includes a getter. The gas adsorbent is visible through at least one of the first glass panel and the second glass panel. The gas adsorbent has properties of changing its color when adsorbing gas.

Disclosed are systems and methods for the robust passive detection of airborne toxins using a colorimetric sensor coating onto a optically transparent substrate. In certain embodiments, the substrate is affixed to an adhesive material (tape). In certain embodiments, the sensor and substrate are transparent. In various embodiments, multiple sensors are coated onto selected substrate for the simultaneous detection of multiple toxins. In various embodiments, the sensed or detected toxins include a number of chemical warfare agents and toxic industrial chemicals. In various implementations, the tape is affixed to a remote surface, which may be visually monitored by a camera directly by focusing the camera on the tape or may be affixed to a camera lens by an adhesive backing, such that colorimetric sensor changes may be observed through the lens itself. Sensor claddings consist of optical grade polymers immobilized with colorimetric and/or fluorescent indicators that undergo optical changes upon exposure to their target analyte. Typical substrate cross-linked polymers are urethane acrylate polymer based, co-polymerized with silicone backbone such as dimethyl siloxane, which in general is chemically inert, yet leaves the polymer with the large free-volume necessary for rapid target diffusion. The polymer is cured after immobilization with target indicator mixture, and simultaneously cross-linked by UV light or heat.

A fiber optic sensing device includes an optical fiber having a polished end defining a flat sensory portion coated with a lossy-mode-resonance (LMR) coating. A reflective coating on an end face of the optical fiber facilitates propagation of a return signal. An optic circuit for identifies a wavelength attenuated by the LMR coating from the return signal reflected by the reflective coating based on a moisture presence at the sensory portion. Various gaseous parameters may be detected based on the coating on the sensory portion. An LMR coating of tin oxide (SnO.sub.2) is employed for moisture sensing.

The present invention discloses novel multi-action copper complexes which are used for reversible vapochromic detection of polar solvents as well as anion sensing in both aqueous and non-aqueous media.

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The present invention relates to active and intelligent additives having hybrid characteristics, that are compatible with polymers, are thermally and mechanically stable, are capable of releasing electrons and/or photons in the presence of chemical compounds, specifically amino compounds, amide compounds, oxygen reducing compounds, water or vapors thereof. The active and intelligent additives incorporate themselves into polymer matrices allowing the obtainment of active and intelligent polymeric articles. These active and intelligent polymeric articles may act as inhibitors of growth of microorganisms and fungi, as well as indicators of the presence of gasses, either in the atmosphere or caused by the decomposition of foodstuffs, for example.

Embodiments relate generally to methods, systems, devices and applications for use in relation to the detection of chemical vapours. A particular embodiment relates to a device for chemical vapour sensing. The device comprises a housing of a size to be manually portable, the housing defining a plurality of receptors adapted to receive a respective plurality of manually replaceable chemical vapour sensing components. The device further comprises at least one signal receiver to receive data signals from each chemical vapour sensing component when the chemical vapour sensing component is positioned in one of the receptors.

An apparatus, method and kit includes one or more use protocol indicators having a color changeable dye, the dye being translucent or having a first color upon immediate exposure to an environment and for a defined time thereafter and the dye changing color after exposure to the environment for the defined time. A dual environment indicator includes a first indicator color changeable dye being translucent or having a first color upon immediate exposure to a first environment and changing color after exposure to a second environment and a second indicator color changeable dye being translucent or having a first color upon immediate exposure to the second environment and for a defined time thereafter and changing color after exposure to the second environment for the defined time. A time exposure indicator comprises at least one color changeable dye disposed to change color in a sequential manner.

Provided is a sensing system that has a long life span. The sensing system includes a first detector (1) and a second detector (2) that detect at least one type of detection target which is included in a first concept which is common to both of detection targets, and which is included in a subordinate concept of the first concept; and a controller (3) that controls, according to a detected value from any one of the first detector (1) and the second detector (2), start, stop, or a detection condition of detection operations of the other detector.

A detector arrangement for a blood culture bottle incorporating a colorimetric sensor which is subject to change of color due to change in pH or CO.sub.2 of a sample medium within the blood culture bottle. The detector arrangement includes a sensor LED illuminating the colorimetric sensor, a reference LED illuminating the colorimetric sensor, a control circuit for selectively and alternately activating the sensor LED and the reference LED, and a photodetector. The photodetector measures reflectance from the colorimetric sensor during the selective and alternating illumination of the colorimetric sensor with the sensor LED and the reference LED and generates intensity signals. The reference LED is selected to have a peak wavelength of illumination such that the intensity signals of the photodetector from illumination by the reference LED are not substantially affected by changes in the color of the colorimetric sensor.