Abstract:
A gas sensor comprises a cavity for containing a gas, means for generating radiation which is transmitted through the cavity and includes one or more wavelengths which is absorbed in use by a gas to be detected; and a detector for detecting radiation which has passed through the cavity. The walls of the cavity are sufficiently reflective to the radiation that the cavity is substantially uniformally illuminated with the radiation.
Abstract:
Described and claimed is an interchangeable tip-open cell fluorometer comprising a housing and a fluorometric probe tip interchangeably connected to the housing, the probe tip including a probe tip housing defining an open cell and enclosing a probe optical arrangement, the probe optical arrangement including an excitation source and a fluorescence detector wherein the excitation source is aimed directly into the fluorescence detector such that a sample can be fluorometrically detected. Also claimed is a method of using this interchangeable tip-open cell fluorometer for detecting fluorescent signals emitted by one or more fluorophores from samples from a natural or industrial water system. The fluorometer, when coupled with a controller, is capable of monitoring and optionally controlling an industrial process or system.
Abstract:
Described and claimed is an interchangeable tip-open cell fluorometer comprising a housing and a fluorometric probe tip interchangeably connected to the housing, the probe tip including a probe tip housing defining an open cell and enclosing a probe optical arrangement, the probe optical arrangement including an excitation source and a fluorescence detector wherein the excitation source is aimed directly into the fluorescence detector such that a sample can be fluorometrically detected. Also claimed is a method of using this interchangeable tip-open cell fluorometer for detecting fluorescent signals emitted by one or more fluorophores from samples from a natural or industrial water system. The fluorometer, when coupled with a controller, is capable of monitoring and optionally controlling an industrial process or system.
Abstract:
A multichannel fluorosensor includes an optical module and an electronic module combined in a watertight housing with an underwater connector. The fluorosensor has an integral calibrator for periodical sensitivity validation of the fluorosensor. The optical module has one or several excitation channels and one or several emission channels that use a mutual focusing system. To increase efficiency, the excitation and emission channels each have a micro-collimator made with one or more ball lenses. Each excitation channel has a light emitting diode and an optical filter. Each emission channel has a photodiode with a preamplifier and an optical filter. The electronic module connects directly to the optical module and includes a lock-in amplifier, a power supply and a controller with an A/D converter and a connector. The calibrator provides a response proportional to the excitation intensity, and matches with spectral parameter of fluorescence for the analyzed fluorescent substance.
Abstract:
A multimode waveguide device for assays includes a multimode waveguide with a patterned, reflective surface coating. The exposed portion or portions of the reflectively coated waveguide surface are for analyte recognition. A fluidics cell is attached to the waveguide so that the channel or channels of the fluidics cell match with the exposed portion or portions of the waveguide surface. The channel or channels direct one or more sample fluids over the exposed portion or portions of the waveguide surface. The reflective coating minimizes loss and scattering of excitation and fluorescence light during a fluorescence assay.
Abstract:
A liquid and gas analyzing system that provides a sample collecting probe that delivers the sample through inert materials to prevent any contamination. For gas analyzing for environmental monitoring process control, a sample collecting probe having a borosilicate glass tube liner connected through an inner spiral tube to the analyzer prevents contamination. The system then delivers the sample to a single pass radiated optical cell by a light beam. The light beam is collected by a miniature CCD array spectrometer and delivered to an industrial PC. The output from the industrial PC is then delivered to a software controlled data acquisition system for analysis. The system is constructed to be a modular in design allowing addition of complementary components for measuring and analyzing different materials. The system described can be used for extractive gas analysis as well as extractive liquid analysis for monitoring stack gases, environmental air or general environmental monitoring and with modifications for breath analysis and human saliva and blood testing. The system is also adaptable for long path remote sense gas monitoring of fence lines and for leak detection.
Abstract:
The present invention relates to an optical routing module (2) suitable for use in a light microscope (1) for sample inspection simultaneously with a primary light source (10) and a secondary light source (7) of different wavelength. The module (2) comprises a housing mounting first and second polarizing beam splitters PBS1, PBS2 along a primary light beam pathway through the module and having secondary light beam inlet and outlet means (5,6) opposite different ones of the polarizing beam splitters PBS1, PBS2, which have a narrow predetermined operating wavelength range, defined between s- and p-plane transitional wavelengths, which substantially excludes the primary light source wave length band and such that at least one polarizing plane component of each of the secondary light source and a secondary light output from the sample is subjected to a different one of transmission and reflection from that to which the primary light source is subjected at each of the first and second polarizing beam splitters PBS1, PBS2, which are further formed and arranged for defining a secondary light beam pathway from the inlet (5) to the outlet (6) so that the secondary light beam pathway is brought substantially into alignment with an outward leg of said primary beam pathway upstream of the sample by said first polarizing beam splitter PBS1 and is separated back out from a return leg of said primary light beam pathway downstream of the sample by said second polarizing beam splitter PBS2 whereby in use of the module (2) in a light microscope (1), the area of incidence of the secondary light beam with the sample may be monitored via the primary light beam.
Abstract:
Single or multi-cell reservoir sensors with single illumination sources and one or more detectors per cell unit have an arrangement whereby a gaseous, vapor or liquid sample enters the cell body and interacts with a sensing solution to detect and quantify a given species. Entrance of the sample into the sensor is through an opening in the cell body which may be covered with a membrane to contain the sensing reagent and to presort the species entering the cell. Reservoir cells can be used with organic, inorganic or biochemical sensing materials. A variety of sensors as alcohol, drugs of abuse, organic halides, cyanide and inorganic ions are provided.
Abstract:
A modular probe is provided to enable introduction of light to a sample to be analyzed by an electro-optical device. The probe of the present invention may include an optical rod or other device for propagating light, an optical barrel which in part surrounds the optical rod, and a sleeve which is provided to attach the probe to a source of light such as a fiber optical bundle. The probe may be fitted with a bidirectional focusing adapter and a reflective tip. A transverse probe is also described.
Abstract:
Disclosed is an integrated, multi-module luminescence measuring system. The system can selectively conduct lifetime decay or steady-state measurements of light emitted by a sample which receives exitation light. The system includes: a sample chamber which directs monochromatized, focused excitation light from a selected source at a selected sample and directs any resultant emitted light through a monochromator to either a first gated photodetector or a second regular photodetector. Also present is a reference module with a regular photodetector which may selectively receive a portion of the excitation light. A lifetime decay detector module pulses a selected light source and the gated photodetector so that a converter produces digital signals related to output signals from the photodetector, the digital signals representing the integral of the intensity of the emitted light over a selected time. A steady-state detector module pulses a selected light source and includes a resettable integrator-A/D converter combination which receives the output from the regular photodetectors and produces digital signals representing the integrals over varying time intervals of such outputs. The integrator is reset and the A/D convertor is turned on whenever the light source is pulsed. A data processing module controls sample selection, the wavelengths of the excitation and emitted lights, light source selection, the number and time-width of the various integrations, and the storage and processing of the resulting digital signals.