The present application related to the use of endogenous fluorescent biological markers to determine a parameter of a cell in a liquid Because the techniques provided herein provide accurate results in a relatively short amount of time, the methods described herein can be used to monitor and optimize cell culture online as well determine the presence of a cellular contamination in a cell suspension.

There is disclosed an apparatus for visually inspecting gemstones. The apparatus contains a first light source, a sample stage adapted to receive a gemstone thereon, and a rotating stage located below the sample stage. The rotating stage is adapted to rotate relative to the sample stage. Embodiments of the invention therefore provide a portable and automatic gemstone inspecting apparatus that provides multiple inspection methods centrally without the need to use other external devices.

A label-free method for the spatio-temporal mapping of protein secretions from individual cells in real time by using a chip for localized surface plasmon resonance (LSPR) imaging. The chip is a glass coverslip compatible for use in a standard microscope having at least one array of functionalized plasmonic nanostructures patterned onto it. After placing a cell on the chip, the secretions from the cell are spatially and temporally mapped using LSPR imaging. Transmitted light imaging and/or fluorescence imaging may be done simultaneously with the LSPR imaging.

Hydrocarbon condensate detection and control. The hydrocarbon condensate detection and control system includes detecting hydrocarbon in an aqueous mixture by sensing fluorescence, turbidity, and color of the aqueous mixture and controlling the flow of the aqueous mixture based on the hydrocarbon content of the aqueous mixture.

A method of obtaining a quantum efficiency distribution in a predetermined sample surface, including: irradiating a reference material with excitation light belonging to a first wavelength range; obtaining the reference material's image, which includes a first channel for the first wavelength range and a second channel for a second wavelength range, the first and the second channel's irradiation luminance value in each pixel; irradiating the predetermined sample surface with the excitation light; obtaining the first and the second channel's measurement luminance value in each pixel of the image of the predetermined surface; calculating an absorption luminance value from a difference between the first channel's irradiation luminance value and measurement luminance value; calculating a fluorescence luminance value from difference between the second channel's irradiation luminance value and measurement luminance value; calculating quantum efficiency of each pixel based on the values; and obtaining quantum efficiency distribution.

There is disclosed an apparatus for visually inspecting gemstones. The apparatus contains a first light source, a sample stage adapted to receive a gemstone thereon, and a rotating stage located below the sample stage. The rotating stage is adapted to rotate relative to the sample stage. Embodiments of the invention therefore provide a portable and automatic gemstone inspecting apparatus that provides multiple inspection methods centrally without the need to use other external devices.

A pool cleaning robot that includes a chemical based sensor that is configured to perform fluid quality analysis.

The present invention relates to a method for the optical measurement of at least the stability and the aggregation of particles in a liquid sample which is located in a sample container, wherein the method comprises the following steps: irradiating the sample with light of at least one first wavelength in order to fluorescently excite the particles, irradiating the sample with light of at least one second wavelength in order to examine the scattering of the particles, measuring the fluorescence light which is emitted by the sample; and measuring the extinction light at the second wavelength, wherein the irradiated light of the second wavelength runs through the sample container, is reflected back, runs again through the sample container in the opposite direction and exits as extinction light, wherein the stability is determined based on the measured fluorescence light and the aggregation is measured based on the measured extinction light. The invention further relates to a corresponding apparatus.

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 spatial gradient-based fluorometer featuring a signal processor or processing module configured to: receive signaling containing information about light reflected off fluorophores in a liquid and sensed by a linear sensor array having a length and rows and columns of optical elements; and determine corresponding signaling containing information about a fluorophore concentration of the liquid a fluorophore concentration of the liquid that depends on a spatial gradient of the light reflected and sensed along the length of the linear sensor array, based upon the signaling received