摘要:
An improved optical flow cell adapted for use in a flow cytometer for differentiating formed bodies (e.g., blood cells). Manufactured from a monolithic transparent material, the improved flow cell has an internal flow channel of polygonal transverse cross-section through which prepared samples can be metered and an external envelope suited to acquisition of optical parameters from formed bodies in such samples. Preferably, such flow cell is formed by a glass-drawing process in which a relatively large glass preform having a rectilinear internal channel of a desired polygonal cross-sectional shape is heated and drawn to achieve a desired cross-sectional area of reduced size. Also disclosed are preferred methods for differentiating formed bodies using the flow cell of the invention.
摘要:
A reforming mandrel and a method of use reforming mandrel to reform glass are described. The reforming mandrel comprises an upstream portion, a downstream portion and an at least partially hollow interior. The upstream portion may have an intake inlet for fluid flow. The downstream portion may be axially spaced from the upstream portion. The downstream portion may have a flattened cross-section defined by flattened peripheral portions joined by curved peripheral portions. At least one curved peripheral portion may be made of porous material resistant to a temperature of at least 1000° C. The at least partially hollow interior may communicate with the intake inlet and the porous material.
摘要:
A method for controlling a bore diameter (120) of an optical fiber ferrule (110) is disclosed. The diameter of the bore is controlled by collapsing the ferrule around a rod (100) inserted in an over-sized bore formed therein. The diameter of the rod is selected to match the diameter of the optical fiber to be supported by the ferrule. Thus, after the rod is subsequently removed from the ferrule, the ferrule has a bore diameter which is defined by the diameter of the rod. Suitable materials for the ferrule and the rod include glass and metal, respectively. The ferrule (110) is heated using conventional methods such as a laser (190). Using focusing optics (195), laser (190) focuses a laser beam (200) at a point in the ferrule that is less than about 200µm away from the over-sized bore (130). Focusing the laser beam (200) at a point in the ferrule (110) that is less than about 200µm away from the over-sized bore (not shown), heats the ferrule (110) so it collapses around the rod (100) without affecting the outer diameter of the ferrule.
摘要:
An apparatus (100) for making glass tubing (200) of a desired non-circular cross-sectional profile (cf FIG. 3) includes a mandrel (101) adapted for positioning proximate heat-softened tubing. The mandrel (101) has a nose (102) and a nozzle section (120) with a chosen profile that will define a final cross-sectional profile of the tubing. The nozzle section (120) has a feed chamber (140) for receiving a gas from a source (207) and a porous and/or foraminous circumferential surface (132,134) through which the gas can be discharged to an exterior of the mandrel. The gas discharges to the exterior of the mandrel, forming a film of pressurized gas in the gap (314, 318) between the porous circumferential surface (132,134) and the heat-softened tubing (200). A method of forming tubing having a non-circular cross-sectional profile using the apparatus is also provided. A glass sleeve made from the reshaped or formed tubing is also disclosed: a monolithic sleeve made of parallel, opposite, flat and smooth front and back covers for use in an electronic device (cf FIG. 13). Some glass-ceramic materials may also be suitable for the tubing, such as transparent beta spodumene.
摘要:
An improved optical flow cell adapted for use in a flow cytometer for differentiating formed bodies (e.g., blood cells). Manufactured from a monolithic transparent material, the improved flow cell has an internal flow channel of polygonal transverse cross-section through which prepared samples can be metered and an external envelope suited to acquisition of optical parameters from formed bodies in such samples. Preferably, such flow cell is formed by a glass-drawing process in which a relatively large glass preform having a rectilinear internal channel of a desired polygonal cross- sectional shape is heated and drawn to achieve a desired cross-sectional area of reduced size. Also disclosed are preferred methods for differentiating formed bodies using the flow cell of the invention.
摘要:
A method for forming a continuous glass sheet from a tube of glass includes expanding and thinning the tube of glass by drawing the tube of glass over susceptor bearing (100) comprising a porous sidewall (110) defining an internal chamber (116). The diameter of the susceptor bearing (100) may increase between a top portion (102) and a bottom portion (108). The tube of glass may be maintained at a temperature above a softening point of the glass as the tube of glass is drawn over the susceptor bearing (100). The tube of glass is suspended over the susceptor bearing (100) by blowing the tube of glass away from the susceptor bearing (100) in a radial direction with a pressurized fluid supplied to the internal chamber (116) and emitted from the porous sidewall (110) as the tube of glass is drawn over the susceptor bearing (100). Thereafter, the tube of glass is cooled and sectioned to form a continuous glass sheet (400). A system (200,300) for forming the glass sheet is also provided.