A method for analyzing a fluid sample by radiation. The method includes providing a cuvette having a cuvette body with an interior space for receiving the fluid sample, and an upper opening for filling and removing the fluid sample, and a lower opening for analyzing the fluid sample by the radiation, introducing the fluid sample into the interior space, irradiating the fluid sample with a primary radiation, and analyzing the fluid sample by receiving a secondary radiation originating from the fluid sample by a detection device.

A system for evaluating light scattering properties of a liquid sample includes a light scattering instrument with a chassis and a laser source that emits a laser beam along a path. An apparatus includes a pressure cell with a chamber for containing a fluid pressurized up to 350 MPa and a plurality of light-transmissive windows, including a beam entry window and a beam exit window positioned in the path of the laser beam, and one or more windows positioned orthogonal to the path of the laser beam. A biological sample is received in the pressure cell. A plurality of detectors includes a transmission detector disposed adjacent the beam exit window, or light scattering detectors positioned adjacent the windows orthogonal to the path of the laser beam and configured to detect light scattered from the laser beam passing through the sample. An external condition-inducing system provides a fluid temperature and pressure.

The present invention is a cuvette assembly for use in optically measuring at least one characteristic of particles within a plurality of liquid samples. The cuvette assembly comprises a main body having internal walls and external walls, and a plurality of cuvettes within the main body at least partially being defined by the internal walls. Each of the plurality of cuvettes has a liquid-input chamber for receiving a respective one of the plurality of liquid samples, a filter, and an optical chamber for receiving a respective filtered liquid sample caused by passing the respective one of the plurality of liquid samples through the filter. Each of the optical chambers includes an entry window for allowing transmission of an input light beam through the filtered liquid sample and an exit window for transmitting a forward scatter signal caused by the particles within the filtered liquid sample.

Technology described herein includes a method that includes providing, by an optical light source, a light beam configured to traverse an optical path through a fluid comprising the biological sample in a container. A length of the optical path through the fluid is between 3.3 mm to 5.5 mm, and a center of the light beam is at a height less than 1.6 mm from a bottom interior surface of the container, and a volume of the fluid is less than 120 L. An optical detector receives optical information after the light beam traverses the optical path. An output of the optical detector is associated with at least one parameter representing the one or more characteristics of the biological sample.

The present invention relates to a device and a method capable of measuring turbidity of water used in home appliances, the device comprising: a fluid storage part comprising a reflector; a first light source that emits light to the fluid inside the fluid storage part; a first light receiving part that receives scattered light scattered by suspended particles in the fluid; and a control part that measures the turbidity of the fluid by controlling the first light source and the first light receiving part, wherein the first light source and the first light receiving part are positioned to be spaced apart from each other at a predetermined angle around the fluid storage part in the vicinity of the fluid storage part, and wherein, among surfaces of the fluid storage part, the reflector may be positioned between a first surface facing the first light source and a second surface facing the first light receiving part.