Abstract:
Apparatuses and methods for performing spectroscopy and optical microscopy are disclosed. In at least one embodiment, a Raman spectrometer includes a vacuum ultraviolet light source configured to generate light having a wavelength within a window in the vacuum ultraviolet region of the electromagnetic spectrum within which a local minimum in the absorption coefficient of Oxygen occurs. The spectrometer also includes a lens device that receives a first portion of the generated light, directs at least some of the first portion of the generated light toward a target location, receives reflected light from the target location, and directs the reflected light toward a further location. The spectrometer further includes a dispersive device that receives at least some of the reflected light and outputs dispersed light produced based thereupon, and a camera module that is positioned at additional location, where the camera module receives at least some of the dispersed light.
Abstract:
For investigating the spectrum of emission radiation excited in an object by incident radiation, miniaturised spectrometers are known for mobile use. These devices comprise a light source with perforated shutter, an illuminating beam path, a detecting beam path and a spectrometer.For the miniaturised spectrometer according to the invention, a diode laser is preferably used as an edge emitter (without a perforated shutter). The window of the edge emitter is arranged at the focal point of the converging lens at the input of the illuminating beam path (without an optical fibre), preferably without a perforated shutter. The edge emitter produces a divergent beam pencil with an elliptical cross-section. The length ratio of the main axes of the ellipse is more than 2:1. The large main axis of the ellipse runs parallel to the longitudinal axis of the entry slit of the microspectrometer.The miniaturised spectrometer has a reduced size and an increased sensitivity for emission radiation of low intensity. The excitation radiation subjects the object to little loading. Objects in the micro litre or milligram range can be investigated under gentle conditions.
Abstract:
A downhole fluid sample container includes a fluid sample container detachably coupled to a downhole sub, the fluid sample container having an internal chamber for receiving the downhole fluid. At least one semimetal (for example, silicon or germanium) window is coupled to the fluid sample container, the window being substantially transparent to electromagnetic energy wavelengths within a selected band. A method includes transmitting electromagnetic energy from an electromagnetic energy source to downhole fluid through at least one semimetal window in a container, receiving an electromagnetic energy response with a spectrometer, and estimating the downhole fluid property based at least in part on the electromagnetic energy response.
Abstract:
A method for the formation of surface enhanced Raman scattering substrates. The method produces thin substrates that have a nanoparticle ink deposited thereon. The nanoparticle ink may be any suitable nanoparticle ink such as silver, gold or copper nanoparticle ink which includes stabilized nanoparticles. The substrates and nanoparticle ink undergo a first step of heating in order to remove liquid vehicle from the ink. The substrates and nanoparticles then undergo a second step of heating for an amount of time sufficient to remove a substantial portion of the stabilizer and provide a fractal aggregate nanoparticle layer on the substrate having a certain resistivity or conductivity suitable for Raman scattering. This creates SERS substrates with enhanced amplification properties.
Abstract:
The present invention includes a system and method for coherent imaging. The system of the present invention includes a light source adapted to provide coherent light to illuminate a sample resulting in optically mixed coherent signals and a detector adapted to receive the optically mixed coherent signals and produce an output signal in response thereto. The optically mixed coherent signals will be a set of sum and difference frequency combinations of the frequencies in the coherent light. A processor is connected to the detector and adapted to ratio a selected two of the optically mixed coherent signals in response to the output signal received by the detector and to generate an image in response to the ratioed optically mixed coherent signals, which can be displayed for a user.
Abstract:
Use of Confocal Raman Spectroscopy (CRS) for dermatological studies, including a method for determining the thickness of the Stratum Corneum (SC) on a test area of the skin, and to a method for quantifying the effectiveness of a skin care composition. The methods of the invention can be carried in vitro (either artificial skin or a sample of skin) or in vivo (directly on the human skin of a person).
Abstract:
There is disclosed improved apparatus and methods for detection of shape, size and intrinsic fluorescence properties of a fluid borne particle wherein the apparatus comprises a laser, two light sources, two detectors, and optionally a third detector. The apparatus is particularly suitable for detection of airbone biological particles.
Abstract:
A Raman method and system for analysing a sample including an excitation source emitting an incident light beam, a sample holder for mounting the sample, elements for focusing the incident light beam onto the sample surface to generate a Raman scattered light having an intensity, elements for collecting the Raman scattered light to form a Raman scattered light beam, a detection system measuring intensity of the Raman scattered light beam as a function of time. The system includes at least a polarization state generator able to generate four independent polarization states or a polarization state analyzer able to analyze four independent polarization states to detect the intensity of the Raman scattered light beam and calculate a partial or complete Mueller-Stokes matrix of the sample.
Abstract:
A Raman spectroscopic apparatus utilizing a self-aligned non-dispersive external cavity laser as the excitation light source. The output spectrum of the laser is narrowed and stabilized by a volume Bragg grating to provide high spectral brightness. A high throughput optical system is used for Raman scattering signal excitation and extraction, which takes full advantage of the high spectral brightness of the laser source.
Abstract:
Disclosed are apparatus, kits, methods, and systems that include a radiation source configured to direct radiation to a sample; a detector configured to measure radiation from the sample; an electronic processor configured to determine infotmation about the sample based on the measured radiation; a housing enclosing the source, the detector, and the electronic processor, the housing having a hand-held form factor; an arm configured to maintain a separation between the sample and the housing, the arm including a first end configured to connect to the housing and a second end configured to contact the sample; and a layer positioned on the second end of the arm, the layer being configured to contact the sample and to transmit at least a portion of the radiation from the sample to the detector.