Abstract:
The present teachings provide for systems, and components thereof, for detecting and/or analyzing light. These systems can include, among others, optical reference standards utilizing luminophores, such as nanocrystals, for calibrating, validating, and/or monitoring light-detection systems, before, during, and/or after sample analysis.
Abstract:
The present invention comprises an approach for calibrating the sensitivity to polarization, optics degradation, spectral and stray light response functions of instruments on orbit. The concept is based on using an accurate ground-based laser system, Ground-to-Space Laser Calibration (GSLC), transmitting laser light to instrument on orbit during nighttime substantially clear-sky conditions. To minimize atmospheric contribution to the calibration uncertainty the calibration cycles should be performed in short time intervals, and all required measurements are designed to be relative. The calibration cycles involve ground operations with laser beam polarization and wavelength changes.
Abstract:
By employing a high-repeatability optical switch that transmits input optical power selectively either to the standard or the unit under test (UUT), OPHASE presents a system for performing a rapid, repeatable comparison between the standard and the UUT. Further, the selective routing of beam traveling through one of the two output fibers that are coupled to the switch either to the standard or the UUT enables the elimination of much of the system uncertainty by enabling initial characterization of the ratio, Rp, and inequivalence, Im, between the power outputs of the multiple output fibers coupled to the switch. This characterization is accomplished by using an angled interface which is constructed so as to allow simultaneous coupling of the multiple output fibers to the angled interface and enable the power readout of all the output fibers at the standard. Rp and Im are then used to calculate the correction factor that reduces the total uncertainty level in the subsequent calibration of the unit under test.
Abstract:
An optical examination apparatus for optically examining density, distribution, etc. of oxygen in an object to be examined such as organic tissue like brain tissue, of man or animal compressing a light source, an optical fibre bundle having one end on which light emitted from the light source is incident and which is divided at the other end into a first and second branch with a predetermined ratio of division, transmitted and scattered light detection means for detecting light is emitted from the first branch of the fibre bundle and transmitted through and scattered by the object to be examined, monitoring light detection means for detecting monitoring light emitted from the second branch fibre bundle, normalization means for normalizing an output of the transmitted and scattered light detected means on the basis of an output from the monitoring light detection means, representative sampling means for ensuring that the light output from the second branch fibre bundle is representative of that output by the light source. The representative sampling means may be provided by distributing the optical fibres forming the second branch fibre bundle uniformly over the one end of the optical fibre bundle or may comprise a mode scrambler interposed between the one end of the optical fibre bundle and the light source to distribute light from the light source over the whole fibre bundle.
Abstract:
A material inspection apparatus includes a light source, a light receiver, a light converter, and a processing unit. The light source is configured to emit light to a surface of an object to be inspected. The light receiver is configured to receive light reflected from the surface of the object. The light converter is configured to convert the light received by the light receiver into an electric current. The processing unit is configured to determine, according to the electric current, a material of the surface of the object.
Abstract:
A method and a system for measuring an optical asynchronous sample signal. The system for measuring an optical asynchronous sampling signal comprises a pulsed optical source capable of emitting two optical pulse sequences with different repetition frequencies, a signal optical path, a reference optical path, and a detection device. Since the optical asynchronous sampling signal can be measured by merely using one pulsed optical source, the complexity and cost of the system are reduced. A multi-frequency optical comb system using the pulsed optical source and a method for implementing the multi-frequency optical comb are further disclosed.
Abstract:
The invention relates to a sensor having a filter arrangement, downstream of which there is arranged a detector arrangement, and an evaluating device connected to the detector arrangement. The filter arrangement has at least a first filter, the suspect filter, and at least one second filter, the reference filter(s). The first filter is configured as a band pass filter allowing the passage of a first predetermined band, the suspect band. The at least one second filter is configured as a band pass filter allowing the passage of a second predetermined band(s), the reference band(s). The detector arrangement has at least one detector associated with at least one of the filters. The band passes reference filters are distributed above and below the band pass of the suspect filter. The sensor with advantage could be utilized within the IR band, and could advantageously be used to detect CO2.
Abstract:
A method and a system for measuring an optical asynchronous sample signal. The system for measuring an optical asynchronous sampling signal comprises a pulsed optical source capable of emitting two optical pulse sequences with different repetition frequencies, a signal optical path, a reference optical path, and a detection device. Since the optical asynchronous sampling signal can be measured by merely using one pulsed optical source, the complexity and cost of the system are reduced. A multi-frequency optical comb system using the pulsed optical source and a method for implementing the multi-frequency optical comb are further disclosed.
Abstract:
A sensor arrangement comprises at least a first, a second, and a third light sensor. A three-dimensional framework comprises at least a first, a second, and a third connection means which are connected to the at least first, second, and third light sensor, respectively. The first, the second, and the third connection means are configured to align the at least first, second, and third light sensor along a first, second, and third face of a polyhedron-like volume, respectively, such that the sensor arrangement encloses the polyhedron-like volume. The invention also relates to a method for operating the sensor arrangement.
Abstract:
The invention relates to a method for estimating drift in a solar radiation sensor (2) and for calibrating such a sensor, in which the radiation (GMES) measured by this sensor under its conditions of use and a radiation model (51) are taken into account.