Abstract: Aspects of the present disclosure are directed to laser interferometric systems, methods, and structures exhibiting superior laser phase noise tolerance particularly in seismic detection applications wherein laser requirements are advantageously relaxed by employing a novel configuration wherein the same laser which generates an outgoing signal is coherently detected using the same laser as local oscillator and fiber turnarounds are employed that result in the cancellation and/or mitigation of undesired mechanical vibration.

Abstract: An actively Q-switched laser induced breakdown spectroscopy (LIBS) probe, utilizing an optical fiber, a pump beam transmitted through the optical fiber, a coupler, and a lens for collimating the pump beam. The actively Q-switched laser, coupled to a sensor which provides information to a computer that controls a high voltage pulser providing a pulse to a Pockels cell located within the laser which can selectively cause the laser to pulse, resulting in high energy pulses and a second lens for focusing the output pulse such that it creates a plasma or spark. The light from the spark is captured and directed back through an optical system to remote equipment for elemental and/or molecular analysis.

Abstract: A tactile and proximity sensor includes a light source, a light receiver, an elastic structure, and a reflecting mirror. The light source emits light. The light receiver receives light and generates a signal indicating a result of reception of the light. The elastic structure includes an elastic body deformable in response to an external force and includes a reflecting portion to reflect light and transmitting portions to transmit light. The reflecting mirror faces the light source to guide the light from the light source to the reflecting portion and the transmitting portion.

Abstract: Methods for determining sensor channel location in distributed sensing of fiber-optic cables are disclosed. In one method, three or more Fiber Bragg-Gratings (FBGs) connected in series by a standard telecommunication fiber and interrogated using an input distributed fiber-optic sensing (DFOS) laser, where the input DFOS laser has a single wavelength. The input DFOS laser operates on a single wavelength that is different than the respective wavelengths of each of the three or more FBGs. The three or more FBGs are interrogated using an input broadband FBG laser. Each FBG reflects a wavelength of laser light that is proportional to the grating size, using an optical time domain reflectometer (OTDR) at the FBG wavelength, the distance to the particular FBG in the optical domain is computed and compared to the physical measurement of the FBG location. The sensor channel locations of the DFOS system are calibrated and constrained using this method.

Abstract: An optical measuring device which measures absorbance of a measuring object at a plurality of wavelengths, the optical measuring device comprising: a light source device; and an optical measuring part which irradiates the measuring object with light from the light source device and performs optical measurement of the measuring object based on light from the measuring object, wherein the light source device has a first light source, a second light source, and a light source control part which drives the first light source and the second light source, the light source control part performs heating and light emitting drive of the first light source, and drives the second light source, and the light source device irradiates the measuring object with combined light of light from the first light source and light diffused and reflected on a surface of the filament.

Abstract: The present disclosure relates to a method for photometrical charting of a light source (Q, 3) clamped within a positioning device (1) and stationary relative to an object coordinate system (T) by means of a luminance density measurement camera (4) arranged stationary relative to a world coordinate system (W), wherein the light source (Q, 3) is moved between a first actual measurement position (P1?) and at least one further actual measurement position (P2? to P5?) along a kinematic chain of the positioning device (1) within the world coordinate system (W), wherein a luminance density measurement image (81 to 85) describing the spatial distribution of a photometric characteristic within a measurement surface is recorded by means of the luminance density measurement camera (4) in each actual measurement position (P1? to P5?) with the light source (Q, 3) turned on, and wherein the position and/or orientation of the object coordinate system (T) relative to the world coordinate system (W) is recorded in each actua

Abstract: A system and method for optical assessment of a heliostat includes obtaining a point cloud data representing an image of the heliostat; isolating the data; filtering and fitting the filtered heliostat data to a bounding box; translating the heliostat data to a plane to aid in segmentation; segmenting a plurality of facets of the heliostat fitting each of the segmented facets to a respective plane; generating normal vectors characterizing each of the plurality of facets; and calculating a canting angle associated with each respective facet of the plurality of facets. A heliostat with mirrored facets and a scanner are provided. The scanner captures point cloud data representing the heliostat, which is segmented for each facet. Normal vectors characterize the facets and a canting angle is calculated for the respective facet.

Abstract: Provided are a filter array, a spectral detector including the filter array, and a spectrometer employing the spectral detector. The filter array may have a multi-array structure including a plurality of filter arrays. The filter array may include a first filter array having a first structure in which a plurality of first filters with different transmittance spectrums are arranged, and a second filter array having a second structure in which a plurality of second filters with different transmittance spectrums are arranged, the second filter array being arranged to at least partially overlap the first filter array at a first position relative to the first filter array so that the multi-arrangement type filter array has a first set of absorbance characteristics.

Abstract: A laser radar device calculates a wind speed for each of a plurality of divided sections obtained by dividing a trajectory drawn by a laser beam in front of a wind turbine.

Abstract: Disclosed is a measurement system using a fiber Bragg grating sensor, which includes a sensing unit including a plurality of dynamic sensors and static sensors using fiber Bragg gratings to detect mutually different physical quantities to be measured, an optical meter configured to measure each physical quantity by simultaneously processing data output from the plurality of dynamic sensors and static sensors in real time, and a server configured to store and manage the data measured by the optical meter. Mutually different physical quantities are measured by simultaneously processing the data output from the plurality of dynamic sensors and static sensors in real time by using one optical meter.

Abstract: We disclose an on-chip photonic spectroscopy system capable of dramatically improving the signal-to-noise ratio (SNR), dynamic range, and reconstruction quality of Fourier transform spectrometers. Secondly, we disclose a system of components that makes up a complete on-chip RF spectrum analyzer with low-cost and high-performance.

Abstract: An optical system performs a method for measuring an acoustic signal in a wellbore. The optical system includes a light source, an optical fiber and a detector. The light source generates a light pulse. The optical fiber has a first end for receiving the light pulse from the light source and a plurality of enhancement scatterers spaced along a length of the optical fiber for reflecting the light pulse. A longitudinal density of the enhancement scatterers increases with a distance from the first end to increase a signal enhancement generated by the enhancement scatterers distal from the first end. The detector is at the first end of the optical fiber and measures a reflection of the light pulse at the enhancement scatterers to determine the acoustic signal.

Abstract: A system for testing an optical fiber includes an optical source apparatus and an optical image sensor apparatus. The optical source apparatus includes a fiber optic connector that connects to a first end of the fiber, and a light emitting device which emits light into the first end of the fiber. The optical image sensor apparatus includes a fiber optic connector that connects to a second end of the fiber, an image sensor that receives light output from the second end of the fiber and generates corresponding image data, a lens array in an optical path between the fiber optic connector and the image sensor, and a processor coupled to the image sensor. The processor, in operation, determines a set of two-dimensional positions based on the image data output from the image sensor, and determines a test result based on the set of two-dimensional positions.

Abstract: A retrographic sensor includes a clear elastomer substrate, a deformable reflective layer, and a contact surface with an array of rigid, non-planar features formed of a material or a pattern of particles to mitigate adhesion to a target surface while permitting the egress of trapped air around a region of interest. This combination of features permits the contact surface of the sensor to more closely conform to the target surface while physically transferring the topography of the target surface to the deformable layer for imaging through the substrate.

Abstract: In some examples, fiber optic cable location may include transmitting a coherent laser pulse into a device under test (DUT). Based on an analysis of reflected light resulting from the transmitted coherent laser pulse, changes in intensity of the reflected light caused by a plurality of signals directed towards the DUT may be determined. Further, based on the changes in intensity of the reflected light, a location of the DUT may be determined.

Abstract: A liquid chromatography flow cell including an integrated light source and an integrated detection chamber. The integrated light source includes a plurality of light emitting diodes (LEDs), wherein each LED emits light of a specific wavelength. The light emitted from the integrated light source is directed to pass through a sample in a flow chamber of the flow cell without any optical conditioning, and the light not absorbed by the sample flows out of the flow chamber directly into the integrated detection chamber, where an intensity of the unabsorbed light is measured by detectors coupled to the integrated chamber.

Abstract: Methods and apparatus for measuring light intensity are disclosed. The methods and apparatus can be used to verify an article, such as a reaction chamber. Exemplary apparatus include a first arm, a light source coupled to the first arm, a second arm, and a sensor coupled to the second arm. The sensor can receive light from the light source that is transmitted through at least a portion of the article.

Abstract: A light filter and a spectrometer including the light filter are disclosed. The light filter includes a plurality of filter units having different resonance wavelengths, wherein each of the plurality of filter units includes a cavity layer configured to output light of constructive interference, a Bragg reflection layer provided on a first surface of the cavity layer, and a pattern reflection layer provided on a second surface of the cavity layer opposite to the first surface and configured to cause guided mode resonance of light incident on the pattern reflection layer, the pattern reflection layer including a plurality of reflection structures that are periodically arranged.

Abstract: Described herein are a low-cost, non-destructive, and contact-free intelligent inspection system that is field-deployable on a geometry car, high-rail vehicle, or other types of track inspection platforms to identify broken railway/railroad spikes in real-time.

Abstract: A photonic device has a substrate with one or more optical resonators having a first resonant frequency response relative to temperature and a different second resonant frequency response relative to temperature. A first waveguide optically couples a first light beam having a first frequency to a first optical resonator and a second waveguide optically couples a second light beam having a second frequency to a second optical resonator. An optical shifter may shift an optical characteristic of the second light beam. A detector converts output light from the photonic device into an electric signal having a characteristic indicative of a physical condition, such as temperature, of the photonic device. In some cases, output light from the one or more optical resonators is combined and a temperature of the photonic device is determined from a beat frequency in the combined light. One or more multimode optical resonators may be used.