Abstract:
A technique for forming a two-dimensional electronic spectrum of a sample includes illuminating a line within a portion of the sample with four laser pulses; where along the entire line the difference in the arrival times between two of the laser pulses varies as a function of the position and the difference in the arrival times between the other two pulses is constant along the entire line. A spectroscopic analysis may then be performed on the resulting pulsed output signal from the illuminated line to produce a single-shot two dimensional electronic spectroscopy.
Abstract:
A densitometer providing simultaneous sensing of the density in precisely adjacent portions of plural adjacent tracks. The densitometer preferably operates with stellar a pattern in which two reference tracks have been photographically recorded either side of a central specimen track of a star. The simultaneous detection of the three tracks insures a high degree of alignment between the reference and star tracks so that the correlation of their relative positions is a more accurate indication of the shift between the reference and star tracks. Alignment controls and the ability to microscopically view the radiation path through the densitometer facilitates set-up of the system to the high accuracy of results that it can achieve.
Abstract:
There is described an apparatus (2) for measuring an amount of an analyte in a mixture. In one example, the apparatus (2) has a laser source (6) for generating a frequency- modulated laser beam (22). A cavity (36) receives the frequency-modulated laser beam (22) and a photodetector (46) obtains an intensity signal indicative of an interaction between the frequency-modulated laser beam (22) and the mixture. The apparatus (2) has a first demodulator (76) for producing a first demodulation signal. A frequency locking arrangement uses the first demodulation signal to lock a carrier frequency of the frequency-modulated laser beam (22) and a mode of the cavity (36) to each other. The apparatus has a second demodulator (50) for producing a second demodulation signal and for generating, on the basis of the second demodulation signal, an output indicative of the amount of the analyte in the mixture. Other apparatus and methods are described.
Abstract:
The present invention relates to a spectrometry system adapted for determining astray-light induced intensity offset (205) in a spectrum. The spectrometry system comprising: a spectrometer (110) having an entrance slit arranged to receive light from a light source (150) emitting light carrying spectral information, a dispersive material arranged to disperse light entering the spectrometer (110), and an output wherein the dispersed light exits the spectrometer (110) as a spectrum, the spectrum comprising signal photons being photons travelling along an intended optical path within the spectrometer (110) and carrying spectral information pertaining to the light emitted from the light source (150) and stray-light photons being photons not travelling along the intended optical path within the spectrometer (110) and not contributing to the spectral information pertaining to the light emitted from the light source (150); and a front pattern (120) mounted between said light source (150) and said output of the spectrometer (110), wherein said front pattern (120) is arranged to partially block and partially transmit light emitted from said light source (150) giving said light from said light source (150) a predefined imprint when passing through said front pattern (120) such that the spectrum is spatially modulated comprising at least one brighter region (202) containing both signal photons and stray-light photons and at least one darker region (204) containing only stray-light photons.
Abstract:
A portable multi-spectral imaging system and device is disclosed. The system includes at least one image acquisition device for acquiring an image from a subject, a filtering device to filter the light received by the image acquisition device, a processor for processing the image acquired by the image acquisition device, and a display. There is software running on the processor that determines oxgynation values of the subject based on the processed image.