Abstract:
L'invention concerne un procédé d'observation d'une pluralité d'échantillons (12), chaque échantillon (12) comprenant: - une enceinte (30) comprenant une paroi (34) délimitant au moins en partie un espace intérieur, - un ensemble d'organismes comprenant une pluralité d'organismes (14), et - un milieu de culture (16), ledit milieu de culture (16) étant contenu dans l'espace intérieur, le procédé comportant, pour chaque échantillon (12), les étapes de: - obtention d'un premier indicateur représentatif de la quantité d'organismes (14) présents dans ledit échantillon (12) à un premier instant, - obtention d'un deuxième indicateur représentatif de la quantité d'organismes (14) présents dans ledit échantillon (12) à un deuxième instant, - détermination d'au moins une caractéristique relative à l'ensemble d'organismes à partir de la comparaison du premier indicateur et du deuxième indicateur.
Abstract:
A Multi-pass optical cell (1) with an internal space (11) for laser spectroscopy is described, which is able to reduce or eliminate interference fringes appearing by performing laser absorption spectroscopy in the multi-pass optical cells (1) leading to improved absorption spectra. This is achieved by using a multi-pass optical cell (1) comprising an absorption mask (3) which is permanently or removable mountable in the internal space (11) in a rotatably fixed manner, where in a mask wall (30) a plurality of m apertures (300) is formed, in which the position of each aperture (300) is adapted to a predefinable propagation path of a main optical beam and/or the resulting reflection spot pattern (211) defined by the geometry of the multi-pass optical cell (1) and the used angle of incidence of an initial beam (20), so that each aperture (300) is traversable by the main optical beam from a first side (301) to a second side (302).
Abstract:
System and method for detecting and counting bacteria suspended in a biological fluid by means of light scattering measurements is provided. In accordance with the method of the invention the level of signal to noise of the measured intensities of light scattered by a sample of the biological fluid is significantly enhanced for forwardly scattered light within a range of scattering angles which are smaller compared to a predefined maximal scattering angle. The system of the invention includes a cuvette adapted to contain a sample of the biological fluid whose sidewalls and windows are suitably constructed and arranged to significantly reduce the level of reflected light obscuring the scattering patterns measured within the range of scattering angles considered.
Abstract:
L'invention concerne un dispositif optoélectronique de mesure de la teneur en eau dans un élément végétal (10), ainsi qu'un appareil destiné à évaluer et à suivre en temps réel l'état d'hydratation des couverts végétaux (10). Il permet une prise de mesure répétée à intervalle de temps sur un même matériel sans le détériorer ou le détruire. Le dispositif comprend une sonde optoélectronique (1) associée à un bo*tier de mesure (2), la sonde (1) comportant i) une première source de lumière (3) émettant à une longueur d'onde correspondant à une bande de forte absorption de l'eau, ii) éventuellement une seconde source de lumière (4) émettant à une longueur d'onde voisine de la première source (3) et faiblement absorbée par l'eau, et iii) un photorécepteur (5) dont la réponse spectrale correspond aux bandes d'émission de la ou des première (3) et seconde (4) sources de lumière, le dispositif comprenant des moyens (16) de modulation de la puissance optique moyenne émise par la ou les sources (3,4) de lumière selon une fréquence déterminée et des moyens de détection synchrone (8) de la lumière reçue par le photorécepteur (5). La sonde (1) peut être portée par un organe mobile comportant deux mâchoires (21,22) entre lesquelles l'échantillon (10) est engagé sans contact compressif.
Abstract:
A system and method for optical spectroscopic measurements is described. One embodiment includes a measurement head for optical spectroscopic measurements, the measurement head comprising an illumination source configured to illuminate a sample, a collection optic configured to view the sample, and an internal reference, wherein the internal reference can be illuminated by the illumination source and viewed by the collection optic.
Abstract:
Provided herein is a stimulation and measurement device. The stimulation and measurement device includes a microwell plate having a top side, a bottom side, and at least one well extending from the top side towards the bottom side; a first assembly removably positioned on the top side of the microwell plate; a second assembly removably positioned on the bottom side of the microwell plate; and a microcontroller. The first assembly includes a first printed circuit board having at least one pair of stimulating light emitting diodes (LEDs) positioned thereon to align with one of the wells. The second assembly includes a second printed circuit board having at least one photodiode positioned thereon to align with one of the pairs of stimulating LEDs, and at least one excitation LED paired with each of the photodiodes. The microcontroller is configured to control the stimulating LED(s), the photodiode(s), and the excitation LED(s).
Abstract:
A terahertz wave camera that acquires information on a measurement target includes: a sensor unit in which a plurality of elements having spectral sensitivity to the terahertz wave are arranged; a readout circuit unit that reads out signals from the elements; a first light-shielding portion; and an optical unit. The first light-shielding portion reduces disturbance light to which the readout circuit unit has spectral sensitivity. The optical unit guides a terahertz wave from the measurement target to the sensor unit.
Abstract:
An on-site device for detecting presence of a liquid from a site and a method for detecting presence of a liquid from a site using the on-site device, the device comprising a moisture detector arranged to detect the presence of the liquid based on one or more electrical characteristics of the liquid; a first optical detector assembly coupled to the moisture detector, the first optical detector assembly being configured to be activated upon detection of the presence of the liquid by the moisture detector; and wherein upon activation, the first optical detector assembly is configured to detect a substance in the liquid based on one or more optical characteristics of the substance.
Abstract:
Improved colorimetric analysis of liquid samples is provided. A sample holder is used that delivers predetermined volumes of sample individually to each of several colorimetric test patches at the same time with a sliding action. An opaque housing is employed to prevent ambient light from reaching the test patches when color images of the test patches are acquired. Preferably, a mobile electronic device including a camera is attached to the opaque housing to acquire the images. Optical microscopy can be performed in addition to the colorimetric analysis.