Abstract:
An apparatus for measuring fluorescence of potable liquids contained within an optical quartz cell includes a deep UV laser or a compact UV LED that generates a light beam. A UV blocking and visible light transmitting optical filter reduces out-of-band emission from the LED. The optical quartz cell is between a pair of plane mirrors so that light from the light source travels through it several times. A concave mirror collects a fluorescence signal and has a common optical axis with a lens. The common optical axis is normal to an optical axis of the light beam. The concave mirror and lenses are positioned on opposite sides of the optical quartz cell. A fluorescence detector is in optical alignment with the concave mirror and the lens. A boxcar averager is in electrical communication with the fluorescence detector. Optical wavelength selection of the fluorescence emission uses optical filters or a spectrometer.
Abstract:
The present invention relates to a method of matching an illumination beam (IB) of a spectrometric device (1 ) to the shape and size of a small sample (S). The method includes the steps of placing the sample (S) on a curved mirror (11 ) having a curvature such that the incident light falling on the curved mirror from an opening (5) in the spectrometric device (1 ) is reflected back into said opening, and placing detectors (7) connected to a spectrometer outside of light beams reflected from the mirror (11 ). The invention also relates to a spectrometric device for performing the method and a sample.
Abstract:
The invention relates to a system and method for the detection of fluorescent substances, which can be used to locate fluorescent substances situated at an intermediate distance, including at least: laser emitting means emitting in a suitable band in order to produce fluorescences from the family of substances to be located; remote optical receiving means; means for analysing the fluorescence spectral band of the substances to be located; and control means for controlling the laser emitting means and the spectral analysis means, enabling the synchronism necessary for the application of an interlinked ambient noise elimination method, so as to locate the fluorescent trace remotely.
Abstract:
The invention relates to an apparatus and method for optically analysing samples contained in sample sites of a sample holder by means of fluorescence. The apparatus comprises a first light source comprising a plurality of individual light sources (41, 42, 43) having narrow wavelength bands, means (45) for further limiting wavelength bands of the light emitted by the individual light sources (41, 42, 43), means (46) for guiding the reduced-wavelength light to the sample sites (49) of the sample holder, and a detector for detecting light from the sample sites (49). According to the invention said means (45) for further reducing the wavelength bands emitted by the individual light sources (41, 42, 43) comprise a wavelength-tunable single monochromator. The invention allows manufacturing of a microplate reader having the capability for fluorescence measurements at a continuous wavelength range, while maintaining the cost of the device at a reasonable level.
Abstract:
A method of Raman detection for a portable, integrated spectrometer instrument includes directing Raman scattered photons by a sample to an avalanche photodiode (APD), the APD configured to generate an output signal responsive to the intensity of the Raman scattered photons incident thereon. The output signal of the APD is amplified and passed through a discriminator so as to reject at least one or more of amplifier noise and dark noise. A number of discrete output pulses within a set operational range of the discriminator is counted so as to determine a number of photons detected by the APD.
Abstract:
A composition of resonant passive metal-dielectric elements with gain medium results in a meta-material with an effective negative refractive index and compensated losses. To compensate for losses, additional energy is supplied using the stimulated emission from active elements made of a gain material. The overall objective is to overcome the fundamental threshold in resolution for conventional optical imaging limited to about a half-wavelength of incident light. The negative index material with compensated losses (NIMCOL) can be used in NIM-based optical imaging and sensing devices with enhanced sub-wavelength resolution. A lasing device based on overcompensating for the loss in NIM structures is disclosed as well.
Abstract:
A multi-spectrum, multi-channel imaging spectrometer includes two or more input slits or other input for each input channel. The input slits are vertically and horizontally displaced from each other. The vertical displacements cause spectra from the channels to be vertically displaced on a single image sensor on a stationary image plane. The horizontal displacements cause light beams from the input channels to strike a convex grating at different incidence angles and produce separate spectra having different spectral ranges. A retroflective spectrometer includes a convex grating that, by diffraction, disperses wavelengths of light at different angles and orders approximately back along an incident light beam. A single concave mirror reflects both the input channel and the dispersed spectrum. A prism, set of mirrors, beam splitters or other optical element(s) folds the input channel(s) of a spectrometer to enable the input(s) to be moved away from the plan of the image sensor.