Abstract:
A device (100), and corresponding method, includes a pump light source (102) configured to be modulated at a pump modulation and to irradiate a target specimen (112). The device also includes a probe light source (106) arranged to generate a speckle pattern (114) from the target specimen, as well as a sensor (110)configured to detect changes in at least one of position and intensity of one or more speckle lobes of the speckle pattern having correlation with the pump modulation. The device and method are used for non-contact monitoring and remote sensing of surfaces, gases, liquids, particles, and other target materials by analyzing speckle pattern changes as a function of pump light irradiation. Advantages can include much higher sensitivity than existing methods; the ability to use visible probe wavelengths for uncooled, low-cost visible detectors with high spatial resolution; and the ability to obtain target material properties without detecting infrared light.
Abstract:
The invention relates to an infrared sensor unit for performing an infrared measurement on an agricultural or horticultural sample. The sensor unit comprises an illumination unit for generating infrared light propagating towards the sample, and a spectrometer for sensing the generated infrared light after interaction with the sample. The illumination unit includes a control unit for tuning the amount of infrared light generated by the illumination unit.
Abstract:
A light source for near-infrared transmission and reflection spectroscopy can be constructed from a combination of a high power blue or blue-green light emitting diode (LED) and a phosphor element based on an inorganic material. The phosphor element absorbs the LED light and, in response to the LED excitation, emits luminescence that continuously covers the 700 – 1050 nm range. One possible material that can be used for such a near-infrared emitting phosphor element is a single crystal rod of Ti+3 doped Sapphire. An alternative near-infrared emitting phosphor material is a disk or rectangular shaped composite of Ti+3 doped Sapphire powder embedded in a clear optical epoxy or silicone encapsulant. Such a combination of a blue LED for excitation of a phosphor element that emits in a broad wavelength band has been widely used in white LEDs where the emission is in the 400-700 nm range.
Abstract:
A light source for near-infrared transmission and reflection spectroscopy can be constructed from a combination of a high power blue or blue-green light emitting diode (LED) and a phosphor element based on an inorganic material. The phosphor element absorbs the LED light and, in response to the LED excitation, emits luminescence that continuously covers the 700 – 1050 nm range. One possible material that can be used for such a near-infrared emitting phosphor element is a single crystal rod of Ti+3 doped Sapphire. An alternative near-infrared emitting phosphor material is a disk or rectangular shaped composite of Ti+3 doped Sapphire powder embedded in a clear optical epoxy or silicone encapsulant. Such a combination of a blue LED for excitation of a phosphor element that emits in a broad wavelength band has been widely used in white LEDs where the emission is in the 400-700 nm range.
Abstract:
The present disclosure describes broadband optical emission sources that include a stack of semiconductor layers, wherein each of the semiconductor layers is operable to emit light of a different respective wavelength; a light source operable to provide optical pumping for stimulated photon emission from the stack; wherein the semiconductor layers are disposed sequentially in the stack such that a first one of the semiconductor layers is closest to the light source and a last one of the semiconductor layers is furthest from the light source, and wherein each particular one of the semiconductor layers is at least partially transparent to the light generated by the other semiconductor layers that are closer to the light source than the particular semiconductor layer. The disclosure also describes various spectrometers that include a broadband optical emission device, and optionally include a tuneable wavelength filter operable to allow a selected wavelength or narrow range of wavelengths to pass through.
Abstract:
An optical probe comprising a light source providing a light that is directed along a first axis; a diffusive element positioned proximate to the light source to receive the light and to diffuse the light as it exits the diffusive element; and a directional optical element directing the light exiting the diffusive element along at least one of the first axis and a second axis generally perpendicular to the first axis to project the light out of the optical probe and onto a subject.
Abstract:
Vorgeschlagen wird eine mikromechanisch gefertigte optische Vorrichtung umfassend: einen Träger (2) zum Tragen der mikromechanisch gefertigten Vorrichtung (1); ein Beugungsgitter (3) zum Beugen von Licht (LI); eine Platte (4) zum Tragen des Beugungsgitters (3); und eine Auslenkeinrichtung (5, 6; 6, 18, 19) zur Auslenkung (PT, PR) der Platte (4) gegenüber dem Träger (2), wobei die Auslenkeinrichtung (5, 6; 6, 18, 19) eine Lagereinrichtung (5; 18, 19) zum beweglichen Lagern der Platte (4) und eine Antriebseinrichtung (6) zum Bewegen der Platte (4) aufweist; wobei die Auslenkeinrichtung (5, 6; 6, 18, 19) zur rotatorischen Auslenkung (PR) der Platte (4) und zur translatorischen Auslenkung (PT) der Platte (4) ausgebildet ist.
Abstract:
An intracavity laser absorption inf rared spectroscopy system for detecting trace analytes in vapor samples. The system uses a spectrometer in communications with control electronics, wherein the control electronics contain an analyte database that contains absorption profiles for each analyte the system is used to detect. The system can not only detect the presence of specific analytes, but identify them as well. The spectrometer uses a hollow cavity waveguide that creates a continuous loop inside of the device, thus creating a large path length and eliminating the need to mechanically adjust the path length to achieve a high Q-factor. The laser source may serve as the detector, thus eliminating the need for a separate detector.