The invention provides an optical particle sensor (1) comprising: at least one light source (2, 2r, 2g, 2b) configured to emit light rays (20), at least one channel (3) intended to receive a fluid transporting at least one particle (30), and to at least partially receive the light rays (20) emitted by the at least one source (2, 2r, 2g, 2b), such that said light rays (20) are partially scattered by the at least one particle (30), at least one photodetector (4) capable of receiving said scattered light rays (20),
said sensor (1) being characterised in that the at least one source (2, 2r, 2g, 2b) has an emission face (21) facing one side (D) of the sensor and in that the at least one photodetector (4) has a receiving face (41) facing the same side (D) of the sensor (1), such that the light rays received by the at least one photodetector are light rays (20b) backscattered by the at least one particle (30), for at least 90% of them.

The Nondestructive Fluid Sensing System is a device that rapidly scans fluids to determine physical and chemical properties of the sample fluid. The Nondestructive Fluid Sensing System can detect the presence of a sample fluid with various optical and electrical sensors, and determines physical and chemical properties. The system features several innovations that increase sample throughput, reduces sample cross contamination, and eliminates waste products typically used in chemical tests. The system may be applied to various industries including manufacturing quality control, and healthcare.

The invention relates to a method and device for simultaneously measuring mass concentrations of particulates with different sizes. The method detects particulates within different size ranges in air based on laser scattering and can eliminate cross interference between the particulates within different size ranges. The device is simple in structure, can realize on-line simultaneous measurement of PM1.0, PM2.5 and PM10 with high measurement precision and low cost.

A method for monitoring a property of nanoparticles in a flowing suspension comprises providing a sample comprising a flowing suspension. The method further comprises non-invasively monitoring a size distribution of nanoparticles of the flowing suspension using Fourier domain low-coherence interferometry, FDLCI, wherein the monitoring comprises deriving a time and optical path length resolved LCI light scattering signal l(t,z) from time resolved LCI wavelength spectra of interference and deriving information indicative of the size of the particles in the sample based on said time and optical path length resolved LCI light scattering signal using optical path length resolved temporal autocorrelation functions or optical path length resolved frequency power spectra of the spatiotemporal FDLCI signal.

Devices, systems, and methods are disclosed for improved laser speckle imaging of samples, such as vascularized tissue, for the determination of the rate of movement of light scattering particles within the sample. The system includes a structure adjoining a light source and a photo-sensitive detector. The structure can be positioned adjacent the sample (e.g., coupled to the sample) and configured to orient the light source and detector relative the sample such that surface reflections, including specular reflections and diffuse reflections, are discouraged from entering the detection field of the detector. The separation distance along the structure between the light source and the detector may further enable selective depth penetration into the sample and biased sampling of multiply scattered photons. The system includes an operably coupled processor programmed to derive contrast metrics from the detector and to relate the contrast metrics to a rate of movement of the light scattering particles.

The present disclosure describes an apparatus and method of improving temperature uniformity and suppressing well plate warping. In an embodiment, the apparatus includes a barrier configured to be positioned above at least one well configured to contain a liquid sample, where a vessel includes the at least one well, where the vessel is transparent and is configured to be placed within a measurement chamber, where a light measurement apparatus includes the measurement chamber, where the light measurement apparatus is configured to measure light scattered from the liquid sample, where the barrier is configured to seal the at least one well from the measurement chamber, and a weighted lid configured to press a bottom surface of the vessel against a well plate retainer of the measurement chamber, thereby spreading heat among the at least one well and preventing the vessel from warping.

The present disclosure describes a method and apparatus of measuring dynamic light scattering of a sample. In an embodiment, the apparatus includes a platen, a light source underneath the platen and configured to emit emitted light through the platen and into the sample, collector optics underneath the platen and configured to capture scattered light, and an optical absorber configured to be in contact with the sample, configured to absorb transmitted light, and configured to redirect reflected light away from the collector optics. In an embodiment, the method includes depositing a sample on a platen, emitting emitted light from a light source underneath the platen through the platen and into the sample, capturing via collector optics underneath the platen scattered light, contacting the sample with an optical absorber, absorbing via the absorber transmitted light, and redirecting via the absorber reflected light away from the collector optics.

A method for determining a source-dependent particle size distribution of an aerosol by an aerosol measuring device. First, a fraction parameter is determined that corresponds to a fraction of a source-dependent aerosol part of the aerosol. In addition, a particle size distribution of the aerosol particles is determined such that the source-dependent particle size distribution of the aerosol is determined from the fraction parameter and the particle size distribution. In terms of the device, the invention comprises an aerosol measuring device for determining a source-dependent particle size distribution of an aerosol, by means of which aerosol measuring device a fraction parameter can be determined that corresponds to a fraction of a source-dependent aerosol part of the aerosol. A particle size distribution of the aerosol particles can be determined such that the source-dependent particle size distribution of the aerosol can be determined from the fraction parameter and the particle size distribution.

A particle measurement system and method of operation thereof are described. The system and method render a characteristic for a set of particles measured while passing through a measurement volume. The system includes a source that generates a particle-laden field containing the set of particles. The system further includes a sensor that generates a raw particle data corresponding to the set particles passing through the measurement volume of the particle measurement system, where the raw particle data comprises a set of raw particle records and each of one of the raw particle records includes a particle data content. A preconditioning stage carries out a preconditioning operation on the particle data content of the set of raw particle records to render a conditioned input data. A machine learning stage processes the conditioned input data to render an output characteristic parameter value for the set of particles.

A method for determining a particle velocity of an aerosol by means of an aerosol measuring device. Aerosol particles flow through a measuring cell and are illuminated with an electromagnetic beam. The scattered light is registered and detected by a sensor. The temporal signal durations of the scattered light signals are determined, and the particle velocity of the aerosol is determined on the basis of the signal durations. Furthermore, the invention provides an aerosol measuring device designed to carry out the steps of the method according to the invention for determining the particle velocity of an aerosol. In addition, a computer program having program code means is provided, which computer program is configured to carry out the steps of the method according to the invention.