Abstract:
An apparatus and method (and related kit) for determination of the isotopic ratio of 13C to 12C in a gas sample containing carbon dioxide comprising introducing gas into a gas sample chamber, directing light into the sample chamber from a laser light source, the laser light source being capable of accessing one or more of the wavelength pairs 2054.37 and 2052.42; 2054.96 and 2051.67; or 2760.53 and 2760.08 nanometers, and with a detector detecting the laser light energy after passage through the sample chamber.
Abstract:
An apparatus for and method of detecting fires comprising detecting (with one or more detectors) levels of carbon monoxide (12), carbon dioxide (14), and smoke (10) in an ambient environment, computing (using a processor) (20) over time rates of increase of each of the levels, and generating an alarm (50) if one or more of the rates of increase exceed predetermined threshold rates of increase.
Abstract:
An apparatus and method for spectral interferometry comprising providing an interferometer (10) comprising a light source (12) and dithering an element (18) to provide a continuous relative phase shift between target and reference arms of the interferometer.
Abstract:
An apparatus and method for optical pulse characterization comprising employment of an intensity modulator (22) receiving optical pulses, a spectrometer (54) receiving output from the intensity modulator (22), a detector (52) receiving output from the spectrometer, a phase shifter (38) receiving a gate pulse (20) and providing output to the intensity modulator, and information processing means (60) receiving output from the detector and providing commands to the phase shifter.
Abstract:
An apparatus and method (and related kit) for determination of the isotopic ratio of 13C to 12C in a gas sample containing carbon dioxide comprising introducing gas into a gas sample chamber, directing light into the sample chamber from a laser light source, the laser light source being capable of accessing one or more of the wavelength pairs 2054.37 and 2052.42; 2054.96 and 2051.67; or 2760.53 and 2760.08 nanometers, and with a detector detecting the laser light energy after passage through the sample chamber.
Abstract:
An external cavity laser (10) (and method of generating laser light) comprising: a laser light source (12); means for collimating light output by the laser light source (12); a diffraction grating (16) receiving collimated light; a cavity feedback mirror (18) reflecting light received from the diffraction grating (16) back to the diffraction grating (16); and means for reliably tuning the external cavity laser to discrete wavelengths.
Abstract:
An apparatus and method for monitoring oxygen concentrations in fuel tank ullage comprising providing a sensor head comprising an optical cavity, exposing the optical cavity to an ambient gaseous environment of a fuel tank or air separation module, via a laser light source emitting wavelength modulated light through the cavity, and receiving the wavelength modulated light with a detector.
Abstract:
An apparatus and method for differential spectral interferometry comprising providing an interferometer comprising a light source; employing an element to provide a dithered relative phase shift between target and reference arms of the interferometer, detecting output from the interferometer, demodulating signals received from the detector at different multiples of the dither frequencies, generating more than one real-valued interferograms from demodulated signals, and using the real- valued interferograms to obtain the complex spectral interferogram.
Abstract:
The invention is directed to methods of detecting lung, gastrointestinal tract, and systemic infections by measuring 13CO2/12CO2 isotopic ratios of gaseous carbon dioxide in exhaled breath samples of a subject after administration of a 13C-isotopically-labeled compound.
Abstract translation:本发明涉及通过在施用13 C-同位素标记的化合物之后测量受试者呼出的呼吸样本中的气态二氧化碳的13CO 2/12 CO 2同位素比率来检测肺,胃肠道和全身感染的方法。
Abstract:
An external cavity diode laser and method of generating laser light comprising: generating light from a Fabry-Perot diode laser source; collimating light from the source with an intracavity optical element; reflecting light via a feedback mirror; and employing a diffraction grating to receive light from the optical element, diffract received light to the mirror in a non-zero order, receive reflected light from the mirror, and direct reflected light back towards the optical element and Fabry-Perot diode laser to complete an external cavity, the diffraction grating additionally directing a portion of the received light from the optical element toward a target.