A lidar system for detection of a gas comprises an optical transceiver for transmitting and receiving optical radiation. A method of operating the system comprises performing spatially scanned sensing measurements of the gas across a system field of view, and analyzing the sensing measurements to determine the presence and location of excess of the gas in the system field of view. Based on the determined location, an adjusted system field of view is determined and spatially scanned sensing measurements of the gas are performed across the adjusted system field of view to obtain sensing measurements at higher spatial resolution.

For analyzing a sample containing particles of at least two categories, such as a sample containing blood cells, a particle counter subject to a detection limit is coupled with an analyzer capable of discerning particle number ratios, such as a visual analyzer, and a processor. A first category of particles can be present beyond detection range limits while a second category of particles is present within respective detection range limits. The concentration of the second category of particles is determined by the particle counter. A ratio of counts of the first category to the second category is determined on the analyzer. The concentration of particles in the first category is calculated on the processor based on the ratio and the count or concentration of particles in the second category.

For analyzing a sample containing particles of at least two categories, such as a sample containing blood cells, a particle counter subject to a detection limit is coupled with an analyzer capable of discerning particle number ratios, such as a visual analyzer, and a processor. A first category of particles can be present beyond detection range limits while a second category of particles is present within respective detection range limits. The concentration of the second category of particles is determined by the particle counter. A ratio of counts of the first category to the second category is determined on the analyzer. The concentration of particles in the first category is calculated on the processor based on the ratio and the count or concentration of particles in the second category.

The invention concerns method and an apparatus for analyzing the quality and quantity of bubbles or droplets of a dispersed phase in a construction material. The method may be used on construction materials before or during curing of the material, while in a non-solid state with the dispersed phase being entrapped therein. The inventive analyzing includes the steps of: applying a first side of an at least partially transparent plate in contact with a sample of said construction material to make a surface of said sample visible through said transparent plate; illuminating said surface of said sample through said plate from an opposite second side of said plate with at least one light source; providing a photosensitive sensor on said second side of said plate for receiving light reflected from said sample through said transparent plate, receiving from said photosensitive sensor electrical signals corresponding to said received reflected light and rendering from said electrical signals a visual representation of said surface of said sample using an imaging device; analyzing said visual representation with a computer system, by identifying bubbles or droplets of said dispersed phase from the surface of the sample by a spatial illumination encoding of the sample; and by determining the size and location of identified bubbles or droplets of said dispersed phase.

Finally, an indication of the quality of said construction material is computed, based on the size and distribution of the identified bubbles or droplets of said dispersed phase in said sample.

An apparatus for detecting fine dust and microorganisms includes: a sample chamber body including a sample chamber, a light-incidence port through which incident light is incident, and a first light exit port and a second light exit port for emitting the incident light irradiated to the measurement sample; a light-transmitting unit; a first light-receiving unit which separately transmits, via a first path and a second path, exiting light emitted from the first light exit port, detects scattering light from the exiting light transmitted via the first path, and detects fluorescence light of the exiting light transmitted via the second path; a diffused reflection reduction unit provided between the first light exit port and the first light-receiving unit; and a second light-receiving unit which condenses in a Mie-scattering manner and transmits exiting light emitted from the second light exit port and detects fluorescence light of the exiting light.

Disposable, pre-sterilized, and pre-calibrated, pre-validated sensor components are provided. The sensor components interact with a sensor system having disposable fluid conduit or bioreactor bag and a reusable sensor assembly. The components can include an optical bench or inset optical component or module designed to be integrated within the disposable fluid conduit or bioreactor bag, which provides an optical light path through the conduit or bag. The sensors systems are designed to store sensor-specific information, such as calibration and production information, in a non-volatile memory chip on the disposable fluid conduit or bag and on the reusable sensor assembly. Methods for calibrating the sensor and for determining a target property of an unknown fluid are also disclosed. The devices, systems and methods relating to the sensor are suitable for and can be outfitted for turbidity sensing.

The present invention is drawn to devices and systems for allergen detection in a sample. The allergen detection system includes a sampler, a disposable analysis cartridge and a detection device with an optimized optical system. In some embodiments, the allergen detection utilizes aptamer nucleic acid molecules as detection agents. In some embodiments, the nucleic acids are conjugated to magnetic beads or solid surfaces such as glasses, microwells and microchips.

The present invention is drawn to devices and systems for allergen detection in a sample. The allergen detection system includes a sampler, a disposable analysis cartridge and a detection device with an optimized optical system. In some embodiments, the allergen detection utilizes aptamer nucleic acid molecules as detection agents. In some embodiments, the nucleic acids are conjugated to magnetic beads or solid surfaces such as glasses, microwells and microchips.

Various embodiments include a scattered light smoke detector comprising: a two-color LED for emitting light of a first wavelength and a second wavelength; a photosensor spectrally matched with said two-color LED; and a control unit connected to the two-color LED and to the photosensor. The control unit is configured to control the two-color LED to emit light of the first wavelength or the second wavelength and to detect a photosensor signal of the photosensor. The control unit is further configured to analyze the photosensor signal for a first scattered radiation intensity and a second scattered radiation intensity allocated respectively to the first wavelength and the second wavelength. There is a polarizer optically connected upstream of the photosensor or downstream of the two-color LED. The polarizer polarizes light passing through at different intensities in dependence upon the respective wavelength of said light.

The optical cell of an elongated shape has an inner space into which gas is introduced and includes: a cell main body forming the inner space; a manifold member being separably connected to an outer surface of the cell main body extending in a longitudinal direction; and a heating mechanism heating the manifold member, in which the cell main body has a through hole penetrating from the outer surface into the inner space, and the manifold member has a gas introduction path extending along the longitudinal direction and guiding the gas, which has been taken in from the outside, from one side to another side in the longitudinal direction and then guiding the gas to the inner space through the through hole.