Abstract:
An optical gas sensing apparatus includes an explosion-rated device electronics enclosure. An explosion-rated sensing enclosure has a light transmitting element to allow light to pass out of and into the sensing enclosure. The sensing enclosure is operably coupled to the explosion-rated device electronics enclosure by a feed-through. In one aspect, an internal volume of the sensing enclosure is less than or equal to about one fiftieth of the volume of the explosion-rated device electronics enclosure. In another aspect, the thickness of the light transmitting element is less than or equal to about 3 millimeters. A light source is disposed within the sensing enclosure and is operably coupled to the device electronics. A detector is disposed within the sensing enclosure and is also operably coupled to the device electronics.
Abstract:
An infrared detector includes a detecting element, a first electrode, a second electrode, and a covering structure. The detecting element defines an absorbing part and a non-absorbing part. The detecting element includes a first end and a second end opposite with the first end. The first end is disposed in the absorbing part. The second end is disposed in the non-absorbing part. The first electrode is electrically connected with the first end. The second electrode is electrically connected with the second end. The covering structure covers the non-absorbing part. The detecting element further includes a carbon nanotube layer. The carbon nanotube layer includes a plurality of carbon nanotubes disposed uniformly.
Abstract:
Fluorescence chromophores such as phenylene diamine derivatives can undergo oxidative coupling and polymerization to form optical, colorimetric and fluorogenic, multimers and polymers. The presence of carbonyl containing moieties such as aldehydes and ketones under favorable environmental conditions can initiate, catalyze, accelerate and modulate this reaction which in turn provides a mechanism for the detection and quantitation of such moieties. Selected phenylene diamine derivatives can be used for the detection and quantitation of aldehyde and ketones via measurement of the reaction and the associated spectroscopic transformation. In particular, the use of meta-phenylene diamine (rnPDA) and related compounds for aldehyde detection and quantitation is described. The method provides a convenient means for monitoring aldehyde and ketone levels without use of separation steps. The method is applicable to kinetic and quasi-endpoint detection assay formats.
Abstract:
A sensing apparatus (and corresponding method) for monitoring carbon dioxide dissolved in a liquid solution employs a crystal surrounded in part by a sample chamber such that, in use, the liquid solution is in direct contact with the crystal.
Abstract:
A kit for detecting a micro-RNA of interest in at least one sample (C) extracted from a body fluid, including: at least one device (2) including a housing casing (2a) in which at least one housing seat (2b) is obtained for said at least one sample (C), and at least one opening (2c) through which said housing seat (2b) is accessible from the outside; at least one container means (3) for said at least one sample (C), said at least one container means (3) being insertable/disconnectable in/from said housing seat (2b) through said at least one opening (2c); at least one optical excitation group (5), housed in said housing casing (2a), designed to emit at least one excitation light radiation (λ,λ1) towards said at least one housing seat (2b); at least one detection group (6), designed to detect at least one emission light radiation (λ2), that can be generated, in use, by said at least one sample (C), said at least one sample (C) being optically excitable by said at least one excitation light radiation (λ, λ1) emitted by said at least one optical excitation group (5), said at least one detection group (6) being designed to supply at least one electric output signal (SO-signal output) correlated with the quantity, in said at least one sample (C), of said micro-RNA of interest; at least one processing unit (7) designed to receive and process said at least one electric signal (SO) and to output an index correlated with the quantity of said micro-RNA of interest in said at least one sample (C); said at least one container means (3) being made of a material permeable to said at least one excitation light radiation (λ, λ1) and to said at least one emission light radiation (λ2); said at least one group (6) for detecting said emission light radiation (λ2) comprises at least one sensor means (6a) of silicon photomultiplier type.
Abstract:
A sample acquiring device, an apparatus and a method for spectrophotometric measurement of high density lipoprotein (HDL) and at least one of total cholesterol (TC), triglycerides (TG) and glucose (FPG).
Abstract:
A method includes forming a housing having a ceiling portion and a smoke permeable wall portion. The ceiling portion of the housing has a first aperture and a second aperture. The method includes mounting a circuit board to the housing so that the housing and the circuit board collectively define a smoke chamber that is bounded by the ceiling portion, the smoke permeable wall portion and the circuit board. The method includes placing an emitter in the first aperture and placing a detector in the second aperture. The emitter defines an emitting region in the smoke chamber and the detector defines a detecting region in the smoke chamber. In a typical implementation, the detecting region at least partially intersects the emitting region in the smoke chamber, and the emitter and the detector are disposed substantially outside the smoke chamber.
Abstract:
A light source and a method for its use in an optical sensor are provided, the light source including a resistively heated element. The light source includes a power circuit configured to provide a pulse width modulated voltage to the resistively heated element, the pulse width modulated voltage including: a duty cycle with a first voltage; and a pulse period including a period with a second voltage, wherein: the duty cycle, the first voltage, and the pulse period are selected so that the resistively heated element is heated to a first temperature; and the first temperature is selected to emit black body radiation in a continuum spectral range. Also provided is an optical sensor for determining a chemical composition including a light source as above.
Abstract:
A light source and a method for its use in an optical sensor are provided, the light source including a resistively heated element. The light source includes a power circuit configured to provide a pulse width modulated voltage to the resistively heated element, the pulse width modulated voltage including: a duty cycle with a first voltage; and a pulse period including a period with a second voltage, wherein: the duty cycle, the first voltage, and the pulse period are selected so that the resistively heated element is heated to a first temperature; and the first temperature is selected to emit black body radiation in a continuum spectral range. Also provided is an optical sensor for determining a chemical composition including a light source as above.
Abstract:
A device and method for manufacturing an integrated smoke cell are presented. The smoke cell includes an integral housing with a ceiling portion and a smoke permeable wall forming a chamber when mounted on a printed circuit board. An emitter and detector are mounted above apertures in the chamber ceiling so the emitter and detector are mounted substantially outside the chamber while detecting smoke present within the chamber without blocking ingress of smoke through the chamber wall.