A particle size distribution analysis apparatus comprising a sample measurement zone adapted to define a sample of particles, a light emitting means adapted to provide a source of light incident upon the sample measurement zone, and at least a first detection means adapted to measure light levels in the apparatus at particular scattering angles and output a signal to a computation means enabling the particle size distribution of particles contained within the sample to be determined, wherein the computation means is adapted, in use, to calculate a particle size distribution taking into account reflections by the measurement zone of light scattered off the particles.

Measurement of particle size distribution

The device has a laser (1) which illuminates a liquid medium with a sample in a polymer or glass measuring cell (3) by radiating a laser beam (2) transversely to the filling or flow direction of liquid medium within the measuring cell. The detectors (6) are arranged outside of an outer diaphragm system (5), for collecting the light scattered on the sample at different angle ranges. The inner diaphragm system (4) and outer diaphragm system are arranged circularly and concentrically around the axis of measuring cell. Independent claims are included for the following: (1) method for measurement of light scattering properties of sample in liquid medium; and (2) use of light scattering properties measurement device.

Collimating system for multi-angle light diffusion detectors

PROBLEM TO BE SOLVED: To provide a particle size measurement apparatus of a nanoparticle and a particle size measurement method of the nanoparticle which simplify a constitution, and accurately measure a particle size of the nanoparticle. SOLUTION: A measurement cell 20 accommodates a sample 23 in which the nanoparticles 21 having the particle size of 100 nm or below are dispersed in a medium 22, and is irradiated with a laser light from a light source 11. When a scattering light B having a scattering angle θ is detected by a detector 13 among the scattering lights from the nanoparticle 21, the detection sensitivity is drastically improved by causing a wavelength λ of the laser light to be 355 nm, and disposing the detector 13 at a distance of 5 cm from a measurement cell 20. A double slit 14 is provided between the measurement cell 20 and the detector 13 so as to detect the scattering light B having the scattering angle θ only. COPYRIGHT: (C)2011,JPO&INPIT

Particle size measurement apparatus of nanoparticle and particle size measurement method of nanoparticle

PURPOSE:To measure a wide range of scattering beam containing large angle scattering beam with high accuracy by simple constitution by measuring the scattering beam due to parallel beam applied in different directions at a plurality of angle positions through a double slit. CONSTITUTION:A lateral scattering beam measuring optical system 3 is constituted of a laser diode 31, a collimator lens 32 converting the output beam from the laser diode to parallel beam and a lateral scattering beam sensor structure 33 provided to the plane crossing the irradiation surface to a flow cell 1 at a right angle. The structure 33 is constituted of slit plates 331,332 each having slits S formed thereto in the same number as photodetectors 335a-335e and curved into a cylindrical shape in different radii. Since scattering beam is incident to the photodetectors 335a-335e through the double slits S, the scattering angle range of beam becomes extremely narrow and the intensity distribution of scattering beam can be measured with high accuracy. The outputs of the photodetectors 335a-335e are inputted to a computer 4 along with the output of the ring detector 24 of a forward scattering/diffracted beam measuring optical system 2 and the particle size distribution of particles to be measured is calculated.

Niwa Takeshi

Papers

Device for measuring particle size distribution