A method for monitoring the media flow of a jet of droplets is intended to enable reliable process management, especially in industrial applications, in a particularly simple and resource-saving manner. For this purpose signal signatures assigned to individual droplets are continuously recorded by time-resolved measurement of the intensity of the scattered light of a light beam crossing the droplet beam, from which a diagnostic parameter characteristic of the droplet beam is determined.

A method can be provided for analyzing a fluidic sample with dispersed particles. Using such exemplary method, it is possible to irradiate the sample with light, so that the photons of the light transfer momentum to the particles. It is also possible to measure at least one property of the particles that is altered by the momentum transfer. The light can be a propagating beam with an intensity distribution that has gradients pointing to more than one point within each plane normal to the direction of propagation, while varying steadily along the direction of propagation, and/or a 3D vortex trap beam that is configured to confine the particles in a three-dimensional volume by means of high-intensity gradients. An exemplary device can also be provided (e.g., for performing the method), comprising a chamber for holding a sample that is elongate along an axis and configured to pass a beam of light along the axis. The chamber can have a conical inner cross section that substantially expands in the direction of propagation of the beam.

A device for detecting the presence of pollen in the air, including a measuring chamber isolated from external light, an arrangement configured to drive an air flow through the measuring chamber, and a light source emitting a light beam in a direction of propagation through the air flow, into the measuring chamber. The device includes at least four photosensitive sensors configured to measure the luminous flux diffused by the illuminated air flow, in four different directions, a clock, at least two meteorological sensors, and at least one computer capable of determining the nature of a pollen particle present in the air from the data measured by the photosensitive sensors, the clock and the meteorological sensors.

An apparatus includes a process chip and a dynamic light scattering assembly. The process chip includes a fluid chamber including and an optically transmissive material adjacent to the fluid chamber. The process chip is to be removably positioned in relation to the dynamic light scattering assembly. The dynamic light scattering assembly is to direct the light through the optically transmissive material and into the fluid chamber. The dynamic light scattering assembly is further to receive light scattered by particles in fluid in the fluid chamber in response to the first optical fiber emitting light into the fluid chamber and thereby capture light scattering data. A processor determines viscosity of fluid in the fluid chamber based on the captured light scattering data. The processor also determines one or both of size or size distribution of particles in the fluid based the captured light scattering data.

A method and apparatus for particle counting and wavelength or angle performed in combination in order to characterize an aerosol is disclosed. In one example, data regarding particle counting (such as from an optical particle sensor) and data regarding angle or wavelength (such as from an ensemble measurement sensor) may be separately generated, with the separately generated data being analyzed in combination in order to characterize the aerosol. In another example, data regarding particle counting and regarding angle or wavelength may be generated in combination in order to characterize the aerosol.

A super class of polarized transverse vector vortex photon beams patterns are mathematically represented here, which are Majorana-like among them are the radial and azimuthal Laguerre-Gaussian, hybrid π-vector beams, and Airy beams. These optical beams are consider spin-orbit coupled beams based on OAM and SAM parts of light. A Majorana photon is a photon that is identical to its anti-photon. It has within itself both chirality, right and left-handed twist in polarization (SAM) and wavefront (OAM). Applications using Majorana photons improve optical deeper imaging, higher resolution imaging, Nonlinear Optics effects (SHG, SRS, SC), optical communication in free space and fibers, quantum computer as basic qubit, and entanglement for security.

A qualification process for a sample to be examined by means of cryo-electron microscopy. The, sample (12) is applied to a sample carrier (10) provided for cryo-electron microscopy and subsequently the sample (12) arranged on the sample carrier is examined by means of dynamic light scattering. The particle size distribution within the sample (12) is determined by means of the dynamic light scattering. Further, a sample holder designed to carry out the qualification process.

A device for detecting particles in air; said device comprising: a flow channel configured to allow a flow of air comprising particles through the flow channel; a light source configured to illuminate the particles, such that an interference pattern is formed by interference between light being scattered by the particles and non-scattered light from the light source; an image sensor configured to detect incident light, detect the interference pattern, and to acquire a time-sequence of image frames, each image frame comprising a plurality of pixels, each pixel representing a detected intensity of light; and a frame processor configured to filter information in the time-sequence of image frames, wherein said filtering comprises:
identifying pixels of interest in the time-sequence of image frames, said pixels of interest picturing an interference pattern potentially representing a particle in the flow of air, and outputting said identified pixels of interest for performing digital holographic reconstruction.

A particle sizing system is provided that includes an optical source generating a light beam for illuminating particles in a monitored volume, a plurality of light deflectors, each positioned to receive and deflect light scattered by the particles, and an image capture device collecting scattered light deflected by each light deflector. The image capture device outputs an image including a plurality of sub-images, each generated from the collected light deflected from a respective one of the light deflectors. Each particle is imaged as a spot in each sub-image, the plurality of spots associated with each particle corresponding to a plurality of scattering angles. The system also includes a processing unit configured to identify the spots associated with each particle in the sub-images, compute a spot parameter associated with each spot, and determine the size of each particle from its related spot parameters. A particle sizing method is also provided.

A method for non-destructively estimating an average size of scattering particles in a sample, including: transmitting, using a coherent light source, polarized light to the sample; obtaining, using a detector, polarized light reflected from the sample, the polarized light comprising a parallel polarized component and a perpendicular polarized component; determining, using a processor, speckle decorrelation rates for the parallel polarized component and the perpendicular polarized component; and estimating, using the processor, the average size of scattering particles in the sample based on the speckle decorrelation rates for the parallel polarized component and the perpendicular polarized component.