Abstract:
A mercury detection system that includes a flow cell having a mercury sensor, a light source and a light detector is provided. The mercury sensor includes a transparent substrate and a submonolayer of mercury absorbing nanoparticles, e.g., gold nanoparticles, on a surface of the substrate. Methods of determining whether mercury is present in a sample using the mercury sensors are also provided. The subject mercury detection systems and methods find use in a variety of different applications, including mercury detecting applications.
Abstract:
A calibration tool and method of using the tool to calibrate a fiber optic needle oxygen sensor. The tool includes at least a vial sealingly covered by a septa and containing a supply of particulate oxygen getter within the chamber of the vial. The vial has an open top and is constructed from an oxygen impermeable material. The septa is resealing, needle-penetrable and oxygen impermeable. The supply of particulate oxygen getter is retained within an oxygen permeable sachet.
Abstract:
The present invention relates to a method and system of array imaging that extends or maximizes the longevity of the sensor array b minimizing the effects of photobleaching. The imaging system has a light source (12), a variable exposure aperture (14), and a varia filter system (16). The system extends the longevity of sensors (28) by 1) using the variable exposure aperture to selectively expose sections of the sensor array containing representative numbers of each type of sensor, and/or 2) using the variable filter system to control the intensity of the excitation light, providing only the intensity required to induce the appropriate excitation and increasing intensity over time as necessary to counteract the effects of photobleaching.
Abstract:
Methods and apparatus are provided for detecting one or more contaminant particles in an environment with an optical sensor (200). The sensor includes at least one optical waveguide (206,208,210) in a resonant arrangement and a light source (202) positioned in an environment in which the presence of a contaminant particle (230) is sought to be determined. The at least one optical waveguide is of a diameter that an evanescent tail of the lightwave (204) extending there through extends into the environment and is reactive to at least one contaminant particle in the surrounding environment. A detector (226) is positioned to receive light indicative of the sharpness of the optical resonance lineshape of the optical resonator at a preselected optical wavelength. The detected information determines the specific contaminant particle in the environment and the concentration of the contaminant particle in the environment.
Abstract:
A grating structure is written in a photosensitive waveguide (17) by dividing a coherent beam (10) into at least three beams (12, 13, 14), and interfering them at the waveguide (17). The beams may comprise a zero order beam (12) and two first order beams (13, 14) diffracted by a phase mask (11), and their relative phases and amplitudes may be modulated to control and/or tune the grating period and shape. The method allows grating structures to be written in which a first order grating and a second order grating are superimposed.
Abstract:
An optical coupler includes at least one input waveguide and a plurality of output waveguides. The optical coupler spatially disperses optical signals carried on the input waveguide according to wavelength to the output waveguides. The input waveguides and the output waveguides are arranged to provide crosstalk between optical signals carried on the output waveguides.
Abstract:
A method for assessing a cancer status of biological tissue includes the steps of: obtaining a Raman spectrum indicating a Raman spectroscopy response of the biological tissue, the Raman spectrum captured using a fiber-optic probe of a fiber-optic Raman spectroscopy system; inputting the Raman spectrum into a boosted tree classification algorithm of a computer program, and using the boosted tree classification algorithm for comparing, in real-time, the captured Raman spectrum to reference data and assessing the cancer status of the biological tissue based on said comparison, the reference data being previously determined based on a set of reference Raman spectra indicating Raman spectroscopy responses of reference biological tissues wherein each of the reference biological tissues is associated with a known cancer status; and generating a real-time output indicating the assessed cancer status of the biological tissue.
Abstract:
There is disclosed a distributed optical fibre sensor arranged to deliver probe light pulses of different wavelengths into corresponding different sensing optical fibres, and to determine one or more parameters as functions of position along each of the sensing fibres from detected backscattered light of each corresponding wavelength.
Abstract:
An in-situ on-line detection device and detection method for a long-distance metallurgical liquid metal component. The detection device comprises a front-end high-temperature resistant probe (18), a middle-end optical sensing device (19) and a back-end control platform (24), wherein the head of the front-end high-temperature resistant probe (18) is placed in a liquid metal (22), the tail thereof is coaxially connected to the middle-end optical sensing device (19), and an optical window (15) is arranged in the connection position; and the middle-end optical sensing device (19) is connected to the back-end control platform (24) through a signal line (25). The detection device and detection method can provide a timely and valid message for quality control and a melting end, so that the detection time is greatly shortened, the detection distance can be adjusted extensively, the measurement result is accurate, and it can be achieved to measure components that are difficult to measure, such as C, S, P, etc.
Abstract:
A method for assessing a cancer status of biological tissue includes the steps of: obtaining a Raman spectrum indicating a Raman spectroscopy response of the biological tissue, the Raman spectrum captured using a fiber-optic probe of a fiber-optic Raman spectroscopy system; inputting the Raman spectrum into a boosted tree classification algorithm of a computer program, and using the boosted tree classification algorithm for comparing, in real-time, the captured Raman spectrum to reference data and assessing the cancer status of the biological tissue based on said comparison, the reference data being previously determined based on a set of reference Raman spectra indicating Raman spectroscopy responses of reference biological tissues wherein each of the reference biological tissues is associated with a known cancer status; and generating a real-time output indicating the assessed cancer status of the biological tissue.