A life safety detector comprising a housing defining a dark photo detection chamber for receiving ambient material, at least one light source configured to emit light into the detection chamber, at least one light sensing device operable to receive light reflected from the ambient materials in the detection chamber; and a processing device coupled to the at least one light sensing device. In a first mode of operation, the light received by the at least one light sensing device within the dark photo detection chamber is indicative of smoke, and in a second mode of operation, the light received by the at least one light sensing device within the dark photo detection chamber is indicative of an indoor air quality.

Methods of analyzing and filtering light scattering data from a sample potentially containing a non-target compound, for example a contaminant. The presence of contaminants result in outliers in the scattering intensity data that increase both symmetry and width of photon counts obtained via analysis. After identification, various outliers are discarded to account for the non-target compounds and thereafter the remaining light scattering data is analyzed. Preferably, analyzing the light scattering data or photon counts involves determining a level to discard an outlier. In particular, the method includes the steps of identifying and quantifying the mode of photon count distribution and using the peak of the mode of distribution to eliminate outliers.

The present disclosure belongs to the technical field of mechanical spraying, and a color change block with detection feedback as well as spraying equipment are provided. The color change block with detection feedback comprises a cleaning agent valve module, a color change micro valve module, a mixing pipe module and a turbidity detection module which are connected in sequence. A complete collinear common channel is formed among these modules, and the wall surface of the common channel is a complete plane. The turbidity detection module is further connected to the control module and used for monitoring the turbidity of a medium flowing through the common channel in real time so as to determine whether the medium in the common channel meets a cleaning requirement or not and feed a determination result back to the control module, and then the control module switches other media to form a closed-loop control.

An optical detection assembly for monitoring a fluid includes a light source, a light detector array, and a controller. The light source emits light into a fluid, while the light detector array includes a plurality of light detectors and receives light exiting the fluid. The controller determines the concentration of one or more substances in the fluid based on signals received from the light detector array. The assembly may include a second light detector array, with one array receiving transmitted light exiting the fluid, with the other receiving scattered light exiting the fluid. The assembly may include a vessel attachment receiving a portion of a vessel or a vessel connector connecting two vessels. The controller may be configured to determine the concentration of one or more substances in a fluid within a vessel received by a vessel attachment or in a fluid within a conduit defined by a vessel connector.

A method is provided for detecting a property of a gas comprising: emitting a light, comprising a plurality of wavelengths covering a plurality of absorption lines of the gas, along a first axis, the light being scattered by particles of the gas resulting in a scattered light, generating a sensor image using a detection arrangement configured to receive the scattered light and comprising: an optical arrangement having an optical plane and being configured to direct the scattered light on to a light sensor, the light sensor having at least one pixel columns, wherein the pixel columns are aligned to an image plane and configured to output a sensor image, wherein the first axis, the optical plane, and the image plane intersect such that a Scheimpflug condition is achieved, determining, from the sensor image, properties of the gas at a plurality of positions along the first axis.

Method of characterizing particles suspended in a fluid dispersant by light diffraction, comprising: obtaining measurement data from a detector element, the detector element being arranged to measure the intensity of scattered light; identifying a measurement contribution arising from light scattered by inhomogeneities in the dispersant; processing the measurement data to remove or separate the measurement contribution arising from light scattered by inhomogeneities in the dispersant; calculating a particle size distribution from the processed measurement. The detector element is one of a plurality of detector elements from which the measurement data is obtained. The detector elements are arranged to measure the intensity of scattered light at a plurality of scattering angles, the plurality of scattering angles distributed over a plurality of angles about an illumination axis. Identifying a measurement contribution arising from light scattered by inhomogeneities in the dispersant comprises identifying measured scattered light that is asymmetric about the illumination axis.

An optical signal source is positioned at a first side of the flow cell or the flow-line bypass. The optical signal source is capable of emitting an optical signal through the first side of the flow cell or the flow-line bypass. A first optical detector is positioned at a second side of the flow cell. The second side is opposite the first side. The first optical detector is capable of detecting a transmitted-light intensity of the optical signal transmitted through the second side of the flow cell or the flow-line bypass. A second optical detector is positioned at a third side of the flow cell. The third side is different than the first side and the second side. The second optical detector is capable of detecting a scattered-light intensity of a scattered optical signal transmitted through the third side of the flow cell or the flow-line bypass.

An apparatus and method of inline measurement of low-concentration hydrocarbons overlaps fluorescence, scatter and absorption spectroscopy devices so as to measure scatter and absorption of fluorescing oil and the excited fluorescence itself. The apparatus includes a fitting, an input port, an output port, and a sapphire tube having a hollow interior in fluid connection with the input port and the output port. Flow medium passes through the input port, the sapphire tube, and the output port. The apparatus also includes a light emitter, a first detector, and a second detector. The light emitter can include a lens, an absorption and scatter wavelength emitter, and a fluorescence wavelength emitter. An incident absorption and scatter beam and an incident fluorescence beam from the light emitter and parallel so as to determine free hydrocarbon, dissolved hydrocarbons, and solids in a sample within the sapphire tube.

A modular analytic system includes a base, at least one fluid sample processing module configured to be removably attached to the base, at least one fluid sample analysis module configured to be removably attached to the base, a fluid actuation module positioned on the base, a fluidic network comprising multiple fluidic channels, in which the fluid actuation module is arranged to control transport of a fluid sample between the at least one sample processing module and the at least one sample analysis module through the fluidic network, and an electronic processor, in which the electronic processor is configured to control operation of the fluid actuation module and receive measurement data from the at least one fluid sample analysis module.

The present disclosure provides apparatuses, systems, and methods for performing particle analysis through flow cytometry at comparatively high event rates and for gathering high resolution images of particles.