Abstract: A particle detector for rapidly detecting and identifying sub 20 nm particles in Ultra Pure Water (UPW) is disclosed. The detector has a nano particle extractor, a nanoparticle collector, and a tracer particle introducer. The extractor limits the size of droplets output to a predetermined size. The extractor includes (1) a liquid sample inlet, (2) a nebulizer connected to the liquid sample inlet (the nebulizer has a gas supply, and an outlet), (3) an impactor arranged to receive material output from the nebulizer, (4) an evaporator connected to the nebulizer and impactor for providing an aerosol at the extractor outlet, and (5) an aerosol connected to the evaporator. The collector us connected to the extractor and has: (1) a collector inlet connected to the aerosol outlet of the extractor, (2) a vapor condensation growth tube connected to the collector inlet, and (3) a repositionable particle capture plate arranged to receive material output from the growth tube at spatially varying positions.

Abstract: A method and system of measuring the size distribution of particles within dilute colloids, for example, through variation of the minimum ice-nucleation sizes of particles within the colloid. The system for measuring particles in fluids includes, a sample fluid inlet and an ice nuclei counter communicatively connected to the sample fluid inlet, the ice nuclei counter cooling the sample fluid and measuring particles which form crystals in the cooled fluid. The method for measuring particles in fluid includes the steps of providing a sample fluid, cooling the sample fluid, and measuring particles which form crystals in the cooled fluid.

Abstract: A nebulizer for a charged aerosol detection (CAD) system is disclosed. The nebulizer is provided with a spray emitter for generating a spray of droplets within a central region of a spray chamber. The central region is separated from an upper region by a horizontally projecting rib, which defines a passageway between the central and upper regions. The major direction of droplet travel within the upper region is substantially reversed with respect to the major direction of droplet travel within the central region. Larger droplets are unable to negotiate the turn from the central to upper regions and impinge on a rear surface of the spray chamber. Removal of larger droplets has the advantageous effect of enabling the detector to sense a smaller range of particle sizes, which establishes a relatively steady electrical current at the detector.

Abstract: A device for condensing vapor on condensation nuclei, especially for a particle counter, includes an inlet, via which a gas stream carrying particles as condensation nuclei enters into a feed channel; with a saturation channel. An evaporation unit extends over at least a part of the saturation channel. In the evaporation unit a working liquid can be evaporated in the saturation channel. An outlet leads to a measuring unit. At least one flow passage is provided from the feed channel towards the saturation channel. The at least one flow channel is directed at an angle greater than 90° in relation to a direction in which the feed channel extends.

Abstract: A system and method for measuring particle mass distributions as a function of particle diameter. The system includes a nebulizer, a particle size classifier and a particle detector. The system may include a dilution module. It may also include a particle mass classifier. The system and method are useful for distinguishing particle populations of similar size and different densities as well as determining the interaction between materials (binding) in mixed colloid systems with varying material ratios. The system and method are also useful for determining particle density in both homogeneous and heterogeneous colloids.

Abstract: A tomography duct for wind tunnels includes a plurality of light sources and sensors displaced around a support structure. The light sources are cycled and sensor measurements are made from sensors opposite the light sources. Tomographic algorithms are used to determine an extinction map from the sensor measurements. The extinction map provides details about particles in a cross-section of the air flow through the tomography duct.

Abstract: A method and system of measuring the size distribution of particles within dilute colloids, for example, through variation of the minimum detected size of aerosolized colloid particles. The method of determining the size distribution of particles in a fluid, involves forming a stream of aerosol droplets of the fluid, the droplets containing particles and dissolved material, evaporating the droplets to generate particles, and measuring the concentration of particles by varying a detection threshold. A system or apparatus for determining the size distribution of particles in a fluid, includes a droplet former for forming a stream of aerosol droplets of the fluid, the droplets containing particles and dissolved material, and a condensation particle detector for evaporating the droplets to generate particles and for measuring the concentration of particles, the condensation particle detector having a variable detection threshold.

Abstract: Internal components of power generation machinery, such as gas turbine engines, are inspected with a spherical optical camera inspection system mounted on a compact diameter, single-axis inspection scope that is capable of insertion within an inspection port or other accessible insertion site. The inspection scope includes nested, non-rotatable telescoping tubes, which define an extension axis. Circumscribing, telescoping tubes have anti-rotation collars, which are in sliding engagement with a mating axial groove on an outer circumferential surface of a circumscribed tube. The camera is advanced and/or retracted along a scope extension axis by nested, drive tubes, which incorporate at least one external drive screw on a circumscribed drive tube and corresponding female threads formed in a circumscribing drive tube. The spherical camera has a 360-degree field of view, and captures images without rotation about the scope extension axis.

Abstract: A system and method for the monitoring of carbon dioxide (CO2) for chemical contaminants. The carbon dioxide monitoring system includes a contaminant sensor that is configured to detect trace amounts of contaminants in CO2 that is pumped through it in real time. The contaminant sensor includes an interferometer configured to track the amount of contaminants.

Abstract: A single- or multi-well chamber assembly comprising nanoparticle exposure chambers with a plurality of wells designed to hold porous membrane inserts, with cell culture media being maintained on the basal (lower) surface to generate the air-liquid interface. The wells may accommodate a variety of sizes of cell culture inserts and may be arranged radially. The chamber assembly comprises an integrated heating-humidifying mechanism so that the internal chamber environment may be heated to 37° C. and maintained at humid conditions to allow for maintenance of cell cultures. The presently disclosed apparatus may be used to investigate the toxicity of airborne nanoparticles to cells or tissue models grown at the air-liquid interface. Aerosolized nanomaterials are drawn into a multi-well chamber assembly and deposited via electrostatic deposition onto cells grown at the air-liquid interface.

Abstract: A method for determining the number of drops metered with a drop frequency into a reactor, especially in a high temperature decomposition system for analyzers, wherein a gas stream is flowing through the reactor. There exists in the reactor a temperature, which is greater than the boiling temperature of the liquid, and a drop metered into the reactor transforms at least partially into the gas phase following entry into the reactor, especially due to heat transfer from contact with a surface within the reactor, especially directly after contact with the surface within the reactor. With a sampling rate, which is greater than the drop frequency, a sequence of pressure signals dependent on pressure within the reactor is registered, and, from the sequence of pressure signals or from values derived therefrom, the number of drops metered into the reactor is ascertained.

Abstract: A temperature adjustment system configured to adjust the temperature of a fluid used in a semiconductor manufacturing apparatus includes: a heat exchanger including therein a temperature adjuster for heating and cooling the fluid, the heat exchanger being configured to perform heat exchange between the fluid therein and the temperature adjuster; a temperature sensor configured to measure the temperature of the fluid; a PID-constant calculator configured to calculate PID constants for PID control based on the physical properties of the fluid and a time constant of the temperature sensor; and a PID-control calculator configured to perform the PID control on the temperature adjuster with the PID constants calculated by the PID-constant calculator.

Abstract: Methods and apparatus for analyzing a sample using at least one detector are disclosed.

Abstract: To improve an offset accuracy in a particle number counting apparatus (100) condensing a working liquid with sample particles, the apparatus including: a porous member (22) in which a flow path (23) is passed through to form an inlet (23a) at a lower side and an outlet (23b) at an upper side thereof so that the working liquid is supplied to a predetermined section of the porous member so as to be impregnated into the entire part of the porous member; and a housing (21) having an accommodating space for accommodating the porous member (22), wherein a gap (S) is formed between an outer peripheral surface (22a) of the porous member (22) and an inner peripheral surface (21b) of the accommodating space of the housing (21) at least in an upper side than the predetermined section to be supplied with the working liquid.

Abstract: An optoelectronic semiconductor component includes one or more light-emitting diode chips. The light-emitting diode chip has a main radiation side. A diaphragm is arranged downstream of the main radiation side along a main radiation direction of the light-emitting diode chip. The diaphragm is mounted on or in a component housing. The main radiation side has a mean edge length of at least 50 ?m. The diaphragm can be switched from light-impervious to light-pervious. The diaphragm comprises precisely one opening region for radiation transmission. The semiconductor component can be used as a flashlight for a mobile image recording device.

Abstract: Chromatography systems and components suitable for use in chromatography systems are disclosed. Methods of making chromatography systems and components suitable for use in chromatography systems and methods of using chromatography systems and components suitable for use in chromatography systems are also disclosed.

Abstract: A method and apparatus for measuring particle concentration and size distribution of particles in liquids. The method involve separating dissolved and particulate residues in liquids for determination of the size and concentration of the particulate species. The method includes the steps of forming an aerosol from the liquid sample to be analyzed, evaporating the droplets in the aerosol to dryness, and detecting the particles. An apparatus for separating dissolved and particulate residues in liquids for determination of the size and concentration of the particulate species is also disclosed. The apparatus includes a droplet former, a dryer communicatively connected to the droplet former, and a detector communicatively connected to the evaporator for detecting particles.

Abstract: Sizes or size distribution of aerosol particles of an aerosol gas stream is detected. A particle-free carrier flow is saturated in a saturator by a first condensing medium, after which, the carrier flow is mixed in a mixing section turbulently with aerosol particle flow. Advantageously, a plurality of separate mixtures with different saturation ratios are provided and introduced to the first condensing environment in order to condensate the condensing medium onto the aerosol particles. Depending on the saturation ratio, the particles with different lowest original size are activated and grown in a growing section and/or in the condensing environment. After activation and growing, the particles are detected by a detecting means.

Abstract: The present disclosure describes a method and apparatus for detecting particles in a gas by saturating the gas with vapor and causing the gas to flow through a chamber with walls that are at a temperature different than the temperature of the entering gas creating a gas turbulence within the chamber resulting in the gas becoming super-saturated with vapor and causing said super-saturated vapor to condense on said particles and form droplets, which are then detected and counted by an optical light-scattering detector.

Abstract: The present disclosure describes an apparatus for detecting particles in a gas by saturating the gas with vapor and causing the gas to flow through a chamber with walls that are at a temperature different than the temperature of the entering gas creating a gas turbulence within the chamber resulting in the gas becoming super-saturated with vapor and causing said super-saturated vapor to condense on said particles and form droplets, which are then detected and counted by an optical light-scattering detector.

Abstract: Continuous droplet generators and methods are provided. In one embodiment, a continuous droplet generator includes an outer housing that defines a working liquid reservoir configured to maintain a working liquid. The continuous droplet generator also includes one or more heaters configured to change the phase of the working liquid and an evaporation-condensation tube positioned at least partially within the outer housing. The evaporation-condensation tube includes a gas inlet configured to receive a particle-containing gas flow, a gas outlet configured to export generated condensed droplets, a wall, an outer wall surface configured to be in contact with the working liquid, and an inner wall surface in contact with the particle-containing gas flow.

Abstract: Turbulent mixing condensation devices, methods, and systems adapted to condense a working fluid on particles from a sample gas to enlarge the particles for subsequent detection are provided. The device includes a vapor generator adapted to produce a working-fluid saturated carrier gas and a condensation chamber. The working-fluid saturated carrier gas is mixed with a sample gas containing particles to be detected and is then introduced to the condensation chamber. The operating conditions are controlled to enhance the condensation of the working fluid on the particles. The particles are typically forwarded to a particle detection device to detect at least one characteristic, for example, the size, of the particles. The flow of carrier gas to the vapor generator may be regulated to vary the degree of saturation of the carrier gas with working fluid.

Abstract: A reservoir (4) for the working fluid of the saturation unit (3) is connected with a sampling section (1) by a pressure equalization line (9) of the gas that is loaded with solid particles, as a result of which a sucking back of the working fluid from the reservoir (4) into the sampling section (1) and other sections of the measurement environment that are connected with such are prevented, even in the presence of unfavorable pressure conditions.

Abstract: Turbulent mixing condensation devices, methods, and systems adapted to condense a working fluid on particles from a sample gas to enlarge the particles for subsequent detection are provided. The device includes a vapor generator adapted to produce a working-fluid saturated carrier gas and a condensation chamber. The working-fluid saturated carrier gas is mixed with a sample gas containing particles to be detected and is then introduced to the condensation chamber. The operating conditions are controlled to enhance the condensation of the working fluid on the particles. The particles are typically forwarded to a particle detection device to detect at least one characteristic, for example, the size, of the particles. The flow of carrier gas to the vapor generator may be regulated to vary the degree of saturation of the carrier gas with working fluid.

Abstract: A device having an air sampler, an electrospray apparatus, and a fluorescence excitation and detection system. The air sampler is capable of moving air suspected of containing a biological or chemical aerosol particle into a chamber. The electrospray apparatus is capable of spraying a charged solution into the chamber to coat the aerosol particles with a coating. The solution has a fluorescent-labeled biological or chemical marker capable of specific binding to the aerosol particle. The fluorescence system is capable of detecting fluorescence of the fluorescent label in the coating. A method of detecting the aerosol particle by: moving air suspected of containing the aerosol particle into a chamber; spraying the charged solution into the chamber with an electrospray apparatus, such that a coating of the solution is formed around the particle; exciting the fluorescent label; and detecting fluorescence of the fluorescent label.

Abstract: A system for monitoring non-volatile residue concentrations in ultra pure water includes a nebulizer for generating an aerosol composed of multiple water droplets, a heating element changing the aerosol to a suspension of residue particles, and a condensation particle counter to supersaturate the dried aerosol to cause droplet growth through condensation of a liquid onto the particles. The nebulizer incorporates a flow dividing structure that divides exiting waste water into a series of droplets. The droplets are counted to directly indicate a waste water flow rate and indirectly indicate an input flow rate of water supplied to the nebulizer. The condensation particle counter employs water as the condensing medium, avoiding the need for undesirable chemical formulations and enabling use of the ultra pure water itself as the condensing medium.

Abstract: In order to enable supply of a sampling air to a smoke detection portion at a stable flow velocity, the present invention provides a smoke detector including: a black box (21) including a smoke detection portion (25) having an inflow port and an outflow port; a sampling pipe (30) laid in a monitor space; a gas flow pipe (P) connected to the sampling pipe and which houses a fan (3) therein; a flow path branching portion (33) provided to the gas flow pipe on a secondary side of the fan and connected to the inflow port of the smoke detection portion; and a flow path merging portion (32) which is provided to the gas flow pipe on the secondary side of the fan and connected to the outflow port of the smoke detection portion, and at which a pressure of a fluid flowing through the gas flow pipe is lower than a fluid flowing through the gas flow pipe at the flow path branching portion.

Abstract: An apparatus and method for quantifying ketone or alydehyde concentrations of gas. The invention includes passing a gas sample through a reactor and an optical cell and determining a concentration of a gaseous reaction product. Using the concentration of the gaseous reaction product and a predetermined reaction conversion efficiency, a ketone or aldehyde concentration is calculated. This invention can be used for diabetes screening, diabetes maintenance, identification and quantification of ketosis, explosives detection and formaldehyde detection.

Abstract: A system for monitoring non-volatile residue concentrations in ultra pure water includes a nebulizer for generating an aerosol composed of multiple water droplets, a heating element changing the aerosol to a suspension of residue particles, and a condensation particle counter to supersaturate the dried aerosol to cause droplet growth through condensation of a liquid onto the particles. The nebulizer incorporates a flow dividing structure that divides exiting waste water into a series of droplets. The droplets are counted to directly indicate a waste water flow rate and indirectly indicate an input flow rate of water supplied to the nebulizer. The condensation particle counter employs water as the condensing medium, avoiding the need for undesirable chemical formulations and enabling use of the ultra pure water itself as the condensing medium.

Abstract: Turbulent mixing condensation devices, methods, and systems adapted to condense a working fluid on particles from a sample gas to enlarge the particles for subsequent detection are provided. The device includes a vapor generator adapted to produce a working-fluid saturated carrier gas and a condensation chamber. The working-fluid saturated carrier gas is mixed with a sample gas containing particles to be detected and is then introduced to the condensation chamber. The operating conditions are controlled to enhance the condensation of the working fluid on the particles. The particles are typically forwarded to a particle detection device to detect at least one characteristic, for example, the size, of the particles. The flow of carrier gas to the vapor generator may be regulated to vary the degree of saturation of the carrier gas with working fluid.

Abstract: A cloud condensation nuclei instrument including an aerosol flow line (320) to carry a desired sample to the CNN chamber (310) and a temperature control unit (313A, 313B) to provide a monotonically increasing temperature profile along the direction of flow.

Abstract: A particle measuring system and method is capable of separating particles on a size-by-size basis and measuring the number and size of the particles one by one on a real time basis. The particle measuring system includes a sampling device for guiding a stream of an aerosol containing particles suspended in a gas, an analysis device for separating one by one the particles contained in the aerosol, a filter for filtering out the particles contained in the aerosol to produce a filtered gas, a saturating device for saturating the filtered gas with working liquid to thereby produce a saturated gas, a condensing device for condensing the saturated gas to produce liquid droplets each having a nucleus formed of one of the particles, and an optical particle counter for calculating the number and size of the particles contained in the liquid droplets.

Abstract: A condensation particle counter is capable of efficiently measuring the number and size of fine particles. The condensation particle counter includes a saturator, a plurality of condensers and a plurality of optical particle counters. The saturator is designed to generate a saturated gas by saturating a gas in which fine particles are suspended with working fluid. The condensers are connected to a downstream side of the saturator to condense the saturated gas so that liquid droplets can grow around the fine particles. The optical particle counters are connected to downstream sides of the condensers to optically detect the liquid droplets supplied from the condensers. Each of the condensers has a condenser tube for interconnecting the saturator and each of the optical particle counters. The condenser tube is provided with a hydrophilic tube installed inside surface of the condenser tube.

Abstract: A condensation particle counter is capable of efficiently measuring the number and size of fine particles. The condensation particle counter includes a saturator, a condenser and an optical particle counters. The saturator is designed to generate a saturated gas by saturating a gas in which fine particles are suspended with working fluid. The condenser is connected to a downstream side of the saturator to condense the saturated gas so that liquid droplets can grow around the fine particles. The optical particle counter is connected to downstream sides of the condenser to optically detect the liquid droplets supplied from the condensers. The condenser has a condenser tube for interconnecting the saturator and the optical particle counter. The present condensation particle counter can use water as working fluid and also can optically measure fine particles in an easy and accurate manner by forming or installing an inner surface of a condenser tube with a hydrophilic tube.

Abstract: Turbulent mixing condensation devices, methods, and systems adapted to condense a working fluid on particles from a sample gas to enlarge the particles for subsequent detection are provided. The device includes a vapor generator adapted to produce a working-fluid saturated carrier gas and a condensation chamber. The working-fluid saturated carrier gas is mixed with a sample gas containing particles to be detected and is then introduced to the condensation chamber. The operating conditions are controlled to enhance the condensation of the working fluid on the particles. The particles are typically forwarded to a particle detection device to detect at least one characteristic, for example, the size, of the particles. The flow of carrier gas to the vapor generator may be regulated to vary the degree of saturation of the carrier gas with working fluid.

Abstract: A system for monitoring non-volatile residue concentrations in ultra pure water includes a nebulizer for generating an aerosol composed of multiple water droplets, a heating element changing the aerosol to a suspension of residue particles, and a condensation particle counter to supersaturate the dried aerosol to cause droplet growth through condensation of a liquid onto the particles. The nebulizer incorporates a flow dividing structure that divides exiting waste water into a series of droplets. The droplets are counted to directly indicate a waste water flow rate and indirectly indicate an input flow rate of water supplied to the nebulizer. The condensation particle counter employs water as the condensing medium, avoiding the need for undesirable chemical formulations and enabling use of the ultra pure water itself as the condensing medium.

Abstract: A high performance liquid chromatography system employs a nebulizer with a flow restriction at the exit of its mixing chamber to produce finer droplets, and an adjustable impactor for increased control over droplet sizes. Downstream of the mixing chamber, the nebulizer can incorporate tubing that is permeable to the sample liquid, to promote aerosol drying through perevaporation. A condensation particle counter downstream of the nebulizer uses water as the working medium, and is adjustable to control threshold nucleation sizes and droplet growth rates. A particle size selector employing diffusion, electrostatic attraction or selection based on electrical mobility, is advantageously positioned between the nebulizer and the CPC.

Abstract: To provide a fine particle measurement apparatus with an exhaust purification function, which is capable of suppressing an exhaust from having an adverse effect on an environment without degrading the reliability of fine particle measurement. A fine particle measurement apparatus with an exhaust purification function includes a condensation nucleus counter 30 for condensing alcohol together with fine particles 40 in air thereby to enlarge the fine particles 40, and measuring the enlarged fine particles 40, and an exhaust purification device 13 for purifying an exhaust of the condensation nucleus counter 30. The exhaust purification device 13 includes a photocatalytic filter 14, a chemical filter 15 for adsorbing the alcohol, thereby removing the alcohol, a water-type filter 17 for melting the alcohol to remove the alcohol, and a filter 16 for filtering the fine particles 40 contained in the exhaust to remove the fine particles 40.

Abstract: An aerosol-into-liquid collector (ALC) for collecting gas-borne particles from a large volume of gas such as air into a small volume of liquid is described. The ALC uses a linear quadrupole to concentrate particles flowing in a gas and to help direct these concentrated particles toward a small volume of collection liquid so that these particles tend to combine with a small volume of collection liquid that can then be drawn from the ACL for further analysis. The particles in the gas are typically given a charge that is opposite to that of the charge imparted to the volume of collection liquid so that electrostatic forces help draw particles from the flowing gas into the small volume of liquid. The linear quadrupole focuses toward it axis particles that have the charge, mass and mobility to be stable in the linear quadrupole.

Abstract: Aerosol particle analyzer (APA) for measuring an analyte in airborne particle is described. Airborne particles are first given an electrical charge and then drawn in air past an oppositely charged volume of an analysis liquid that exposed to the air at a small hole in a container, such as a capillary, that holds that analysis liquid. Electrostatic forces enhance the rate that the airborne particles collide with the small exposed volume of the analysis liquid in the hole. If the particles that collide with the analysis liquid contain the analyte, an optical property of the analysis liquid, such as the fluorescence, varies according to the amount of the analyte in the particles. This optical property is measured and the amount of analyte in the particles is determined from the measured optical property.

Abstract: Aerosol particle analyzer (APA) for measuring the amount of analyte in airborne particle is described. The APA uses an analysis liquid. In most embodiments, this analysis liquid is chosen so that when it is mixed with the particles, an optical property of the analysis liquid (AL) varies according to the amount of the analyte in the particles. Airborne particles are drawn into the instrument, and detected using optical methods such as light scattering or laser-induced fluorescence. When a particle of interest is detected, a charged droplet of the analysis liquid (CDAL) is ejected so that it collides with the detected particle and moves into a horizontally oriented linear quadrupole that is in an airtight container, except for small orifices to let the CDAL enter and exit.

Abstract: Aerosol particle analyzer (APA) for measuring the amount of analyte in airborne particle is described. The APA uses an analysis liquid. When this analysis liquid is mixed with the particles, an optical property of the analysis liquid (CDAL) varies according to the amount of the analyte in the particles. A charged droplet of the analysis liquid is levitated. Airborne particles are drawn into the instrument and given a charge that is opposite that of the CDAL, and made to flow near the CDAL so that electrostatic forces greatly increase the probability that the CDAL and charged particles will combine. Then the CDAL is ejected into a horizontally oriented linear quadrupole that is in an airtight container, except for a small orifice to let the CDAL enter. The CDAL is levitated in a high humidity environment so that it evaporates slowly, so that there is time for the reaction between the analyte, if any, and the CDAL can take place, and so that the optical property, typically fluorescence, can be measured.

Abstract: The present invention is directed to a system for converting between single flow and split flow evaporative light scattering detection devices for detecting samples in a mobile phase. Included in the system is a evaporative light scattering detection device, a low temperature adaptor, and a connection tube for providing a fluid connection between the evaporative light scattering detection device and the low temperature adaptor.

Abstract: A condensation particle counter measures the number of ultra-fine particles by growing the ultra-fine particles through a condensing process. The counter includes a capillary in which vapor of operating liquid is condensed and the ultra-fine particles grow. An insulating material surrounds the capillary to shut out heat flow between the capillary and the environment. The condensation particle counter can use various operating liquids including alcohol and water, and can be also applied to semiconductor clean rooms.

Abstract: A condensation nucleus counter has a series of flow passageways forming a flow path, including a first passageway for carrying the gas stream having the particles to be detected which is preferably preheated A saturator is positioned to receive the flow of the gas stream and is made of a porous material of a controlled pore size having a portion immersed in a liquid working fluid. The liquid working fluid moves by capillary action along the length of the saturator. Vapor from the working liquid will be transferred to the gas stream as it moves through the saturator. The gas stream then passes to a condenser that reduces the temperature of the gas stream and causes the working fluid vapor to condense on the particles in the gas stream to form droplets that can be detected and counted.

Abstract: A tunable interferometer for creating an interference pattern of variable periodicity at a fixed location is disclosed. The interferometer includes an optical element for splitting an input beam into a first write beam and a second write beam which are parallel to one another and have a variable distance therebetween. The interferometer also includes a beam directing element for receiving the parallel first and second write beams to intersect at the fixed location with an angle of intersection which is a function of the variable distance between the parallel first and second write beams received.

Abstract: An apparatus and method for producing a diffusive, continuous laminar flow for particle growth via condensation of vapors with a mass diffusivity near or higher than the thermal diffusivity of the surrounding gas. In an exemplary embodiment, the method uses the condensation of water vapor onto particles suspended in air.

Abstract: Provided is a condensation particle counter. The condensation particle counter measures the number of ultra-fine particles by growing the ultra-fine particles through a condensing process. The counter comprises a capillary in which vapor of operating liquid is condensed and the ultra-fine particles grow. An insulating material surrounds the capillary to shut out heat flow between the capillary and the environment. The condensation particle counter according to the present invention can use various operating liquids including alcohol and water, and can be also applied to semiconductor clean rooms.

Abstract: Patterned platelets are platelets made with specified shapes and sizes. The various sizes and shapes of the platelets are used to code articles and substances to which they are applied. The patterned platelets can be in inks or paints applied to articles. The platelets can be further coded by markings thereon or by spectral or polarization codes rather than just the distribution of sizes and shapes. The patterned platelets can be made from any materials buy subtractive or additive processes. A patterned platelet can also be made by an actinic polymer being applied to a substrate and a mask applied to allow only the desired size and shape to be exposed to radiation curing the unmasked portion of the polymer on the substrate. The polymer can be cholesteric liquid crystals with the properties of reflecting polarized light of selected wavelengths to code the crystals in addition to the size and shape codes.

Abstract: A condensation nucleus counter has a series of flow passageways forming a flow path, including a first passageway for carrying the gas stream having the particles to be detected which is heated, so that the gas stream is heated prior to entering a saturator. The saturator is positioned as part of the flow path for the gas stream and is made of a porous material having a portion immersed in a liquid working fluid. The porous material is selected so that capillary action will move the liquid working fluid along the length of the saturator. Vapor from the working liquid will be transferred to the gas stream as it moves through the saturator. The gas stream then passes to a condenser or cooler that reduces the temperature of the gas stream and causes the working fluid vapor to condense on the particles in the gas stream to form droplets. A particle detector, such as a light scattering particle detector, then receives the gas stream and detects the droplets that have been formed.