Abstract:
The invention relates to a smoke detector comprising a chamber (6) designed to collect the smoke which is to be detected, the detector being characterized in that said chamber (6) is defined at least partially by a cover (5), the concave part (52) of which comprises an access wall (53) for the entry of the smoke, having a general orientation essentially parallel to the plane of an external mounting surface (10) on which the detector is mounted on its mounting plate, which is essentially horizontal when the detector is fixed conventionally to a ceiling.
Abstract:
L'invention concerne un détecteur de fumée comprenant une chambre (6) destinée à accueillir de la fumée pour y être détectée, caractérisé en ce que ladite chambre (6) est délimitée au moins en partie par un capot (5) dont le fond (52) comprend une paroi d'accès (53) pour l'introduction de la fumée, ayant une orientation générale sensiblement parallèle au plan d'une surface d'appui extérieure (10) du détecteur contre son socle, qui est sensiblement horizontal lorsque le détecteur est fixé classiquement à un plafond.
Abstract:
A system, method and apparatus for taking a Raman spectrum of a sample is disclosed. In one embodiment, for example, an integrated Raman spectrometer (120) is provided. In another embodiment, a portable Raman spectrometer (320) is provided. In another embodiment, a Raman spectrometer (20) is provided comprising a collimated beam tube (32) for transmitting excitation radiation to an external optical system, such as a microscope (430), a telescope or a camera lens. In another embodiment, a method for correcting a Raman spectrum for background interference is provided. In yet another embodiment, a method for rejecting fluorescence in a Raman spectrometer is provided. A chemical reactor (930) comprising a built-in Raman detector for monitoring a chemical reaction in a reaction chamber of the reactor is also provided.
Abstract:
An optical head (41) comprises first and second members (51, 61) and a tubular member (71). First to fifth holes (52-56) are so formed continuously in the first member (51) as to extend therethrough. Sixth to eighth holes (62-64) are so formed continuously in the second member (61) as to extend therethrough. The second member (61) is inserted into the fifth hole (56) and secured. A semiconductor light-emitting device (23) is inserted into the sixth hole (62). The tubular member (71) has first and second tubular portions (72, 73) and is inserted in the fourth hole (55). A lens (27) is secured between a step portion formed in the border between the second and third holes (53, 54) and the first tubular portion (72). A beam-shaping member (25) is secured between a step portion formed in the border between the fourth and fifth holes (55, 56) and the second member (61).
Abstract:
The present invention relates to a method and apparatus (30) for determining properties of wood specimens from scatter ellipses (35). Measures of grain length can be obtained by analysing the light 20 intensity attenuation along the major and minor axes (22, 24) of the scatter ellipse (35). Maps of grain length over the surface of the specimen can be obtained, and bulk properties of the specimen determined from the map. The modulus of elasticity and the propensity for the specimen to warp can be determined.
Abstract:
The invention relates to a smoke detector comprising a chamber (6) designed to collect the smoke which is to be detected, the detector being characterized in that said chamber (6) is defined at least partially by a cover (5), the concave part (52) of which comprises an access wall (53) for the entry of the smoke, having a general orientation essentially parallel to the plane of an external mounting surface (10) on which the detector is mounted on its mounting plate, which is essentially horizontal when the detector is fixed conventionally to a ceiling.
Abstract:
Motion correction for optical tomographic imaging in three dimensions. An object of interest (1) is illuminated to produce an image (111). A lateral offset correction value is determined for the image (114). An axial offset correction value is determined for the image 115). The lateral offset correction value and the axial offset correction value are applied to the image to produce a corrected file image (116).
Abstract:
Apparatus for detecting particulates (46) within a medium in a chamber (10) comprises a photo-detector (14) which is maintained at a stable low temperature by a Peltier type cooling device (42). Scattered light from the particulate (46) is focussed by a spherical lens (34) onto the input face (30) of a rod lens (22). The latter has an optical pitch of 0.5 and transfers the image to its output face (25) whence it passes via a light pipe (18) to the sensitive area (16) of the photo-electric device (14). The rod lens (22) provides an inexpensive means for transferring the light and which provides a thermal barrier. Thus, although the photo-electric device (14) is held at a low temperature, the input face (30) of the rod lens (22) can be held at the temperature of the medium within the chamber (10) and is not subjected to the formation of mist or ice. The lens (34) is mounted by means of a collar (28) which is slidable into a position in which the lens (34) focusses the input light onto the face (30) of the lens (22), and then secured in this position by ultra-violet-cured adhesive fillets (32, 34).