摘要:
An optical element for conveying scattered and image light to several detectors. The optical element may have the properties of a diffractive beam splitter and imaging lens. The detected light may be from an illuminated target. Further, there may be an optical element for conveying scattered light from a target via several zones to specific detectors, respectively. The latter optical element may include a multiple annular zone diffractive structure on a hybrid lens.
摘要:
A flow cell 2, a composite lens 15, and first to third detectors 16 to 18 are arranged in this sequence in the light pathway of light emitted from a laser light source 1. The composite lens 15 is configured by a convex lens 15a, and lens elements 15b and 15c. These lenses have different focal lengths. When the posture of the composite lens is correct, light impinging on the convex lens forms an image on the first detector. Therefore, the positioning of the composite lens is enabled. When particles in the flow cell are irradiated with laser light, forward scatter is produced. Forward small angle scatter having a small scattering angle impinges on the first lens element 15b to be collected thereby, and is then received by the second detector 17. Forward large angle scatter having a large scattering angle impinges on the second lens element 15c in the outermost periphery to be collected thereby, and is then received by the third detector 18 which is remotest from the composite lens.
摘要:
A fibre detector assembly comprising: (i) a scattering chamber body; (ii) means for drawing airborne particles through said body chamber, said means being adapted such the particles tend to travel in single file with the longitudinal axis of particles with elongate shape substantially aligned with the direction of the air flow; (iii) means for illuminating the particle stream within the chamber body; (iv) an optical detector adapted to intercept and collect a portion of the light scattered by particles passing through the illuminating beam; (v) data processing means adapted to capture and process the signals from the optical detector; characterised in that the optical detector comprises a photodiode array consisting of a central opaque area surrounded by two or more annular rings of detector elements.
摘要:
To determine the shape characteristics of particles, a light beam (preferably a laser beam) is directed onto a transparent cell containing particles flowing therein and the intensity of the light scattered by the particles is measured with the aid of a photodetector array or a mask containing programmable light valves, comprising one or more concentric rings or parts of rings, at least one of which is provided with one or more isolated segments. The rings and the isolated segments are coupled to an energy meter, the signal amplitudes of which are statistically processed to give amplitude classes. The shape characteristics are determined from a graphical or numerical comparison of the amplitude classes. If at least one ring is subdivided into several segments, calculation of the correlation between the signals from the various ring segments leads to an accurate determination of the average shape characteristics of the particles.
摘要:
A reagent for analyzing leucocytes comprises (a) at least one ionic surfactant in an amount sufficient for lysing erythrocytes and cause damage to a part of cell membranes of leucocytes; (b) at least one organic compound having an anionic group in an amount sufficient for making a morphological difference among leucocytes by combining with a cationic component in leucocytes; (c) a nonionic surfactant; and (d) a buffer for adjusting pH.
摘要:
Dans un système de mesure granulométrique, les particules en suspension dans une cellule d'échantillon (8') sont éclairées par des faisceaux de lumière (212) d'interrogation, comprenant une première composante d'interrogation ayant une polarisation parallèle à un plan de dispersion, ainsi qu'une seconde composante d'interrogation ayant une polarisation perpendiculaire audit plan de diffusion. Un photodétecteur (214) produit des premier et second signaux d'intensité représentatifs de l'intensité, à divers angles de diffusion, de la lumière diffusée correspondant aux première et seconde composantes d'interrogation. Un processeur (126) produit un signal de différence représentatif de la différence entre lesdits premier et second signaux d'intensité, et calcule un signal résultant représentatif de la granulométrie, basé sur une transformation arithmétique du signal de différence.
摘要:
La présente invention concerne un dispositif de détermination de caractéristiques de particules en suspension dans un liquide, comprenant des moyens (2) pour injecter des échantillons de particules ; un élément de fractionnement (3) qui classe ces particules en fonction de leur longueur ; une veine de mesure optique (4) recevant la sortie de l'élément de fractionnement cette veine de mesure optique comprenant des moyens pour envoyer un rayonnement électromagnétique cohérent polarisé à travers le flux de particules en suspension et pour recueillir la lumière émergeant dans diverses directions ; et des moyens de calcul (6) des valeurs des intensités et de combinaisons de ces valeurs dans les diverses directions du rayonnement optique.