Abstract: The present disclosure addresses the problem of providing an optical plastic film such that rainbow unevenness when viewed with naked eyes and blackout when viewed with polarized sunglasses can be suppressed without any axis alignment or increase in the in-plane phase difference.

Abstract: MFB twist distribution data is calculated along a multi-fiber shape sensor bundle (MFB) using optical frequency domain reflectometry (OFDR) phase interrogation data. Phase data is extracted from OFDR interferometric interrogation data acquired from an MFB having single core radially offset fibers with fiber Bragg gratings (FBGs) helically wrapped about and rigidly adhered to a central single core fiber with BRFs. A change in phase between current and previously acquired phase signals is calculated for the fibers. The change in phase is unwrapped and FBG gap-induced unwrapping discontinuities are accounted for in the change in phase. The FBG gap-mitigated phase differences are determined for each of the offset fibers and then averaged. The center fiber gap-mitigated phase difference is subtracted from the average to yield a twist-phase difference.

Abstract: A microplate reader simultaneously obtains Raman measurements from samples contained in non-adjacent wells. At least two Raman probes are positioned perpendicularly above or below the microplate to simultaneously acquire Raman spectra data of the non-adjacent liquid samples. Each probe is coupled to a laser and a spectrometer and includes a lens focusing laser light within the sample and collecting light from the sample for the spectrometer. The spectrometer may include a 2D imaging sensor (sCMOS or CCD) to image light from multiple probes simultaneously, spaced from one another to reduce crosstalk. A positioner moves the microplate plate or probes to acquire data from a different subset of non-adjacent samples, and may also vary laser focus within wells during data acquisition. Multiple fluorescence probes may simultaneously acquire fluorescence data from the same samples, or non-adjacent samples. Probes may be fiber-coupled and positioned within a reaction chamber of a liquid handling system.

Abstract: Apparatuses, systems, and methods for Raman spectroscopy are described. In certain implementations, a spectrometer is provided. The spectrometer may include a plurality of optical elements, comprising an entrance aperture, a collimating element, a volume phase holographic grating, a focusing element, and a detector array. The plurality of optical elements are configured to transfer the light beam from the entrance aperture to the detector array with a high transfer efficiency over a preselected spectral band.

Abstract: A collaborative seam tracking method based on laser line scanning sensing includes: scanning, by using a laser line scanning sensor, a weld seam to obtain an original sampling deviation value; coordinate converting the original sampling deviation value to obtain a converted sampling deviation value, and then obtaining a first converted sampling deviation coordinate based on a current position coordinate of a motion mechanism; in response to an absolute difference between the converted sampling deviation value and a position value of a corresponding projection point on a preset path is less than a processing range of a galvanometer, performing a seam tracking; in response to the absolute difference between the converted sampling deviation value and the position value of the corresponding projection point on the taught path is greater than or equal to the processing range, performing Hermite interpolation, thereby obtaining an interpolation function as a motion trajectory.

Abstract: A LIDAR system including an emitter configured to emit at least one light beam; a detector configured for receiving light reflected from surrounding objects; and a rotatable scanning element including a reflective prism having at least four faces inclined relative to the axis of rotation, and a transmission element connected to the reflective prism, the transmission element having an exterior edge portion extending around the axis of rotation generally in a plane orthogonal to the axis of rotation, the edge portion having a variable thickness about the axis of rotation, the emitter, the detector, and the rotatable scanning element being arranged such that the light beam is incident on and refracted by the transmission element and subsequently incident on one face of the at least four faces of the reflective prism, an angle of incidence of the beam on the face depending on the variable thickness of the transmission element.

Abstract: A light detection and ranging (LIDAR) sensor system includes a dual-polarization optical antenna, a single-polarization optical antenna, a first receiver, and a second receiver. The dual-polarization optical antenna is configured to (i) emit a transmit beam with a first polarization orientation and (ii) and detect a return beam having a second polarization orientation. The single-polarization optical antenna is configured to detect the return beam having the second polarization orientation.

Abstract: A device for collaborative detection of carbon and nitrogen emissions and a method thereof are provided. The device includes an integrating cavity, a single beam laser and a dual beam hybrid laser set at opposite ends of the integrating cavity, and an information acquisition and analysis system. The single beam laser and the dual beam hybrid laser are respectively used to continuously emit and transmit laser beams into the integrating cavity. The single beam laser and the dual beam hybrid laser can achieve simultaneous spatio-temporal high-frequency detection of any concentration of CO2—CH4—N2O—N2 mixed gas in one integrating cavity, and the concentration of CO2, CH4, and N2O can be inverted through the information acquisition and analysis system. This device meets the research demand for simultaneous detection of multiple greenhouse gases under the same path, greatly improving the utilization efficiency of the integrating cavity and saving detection costs.

Abstract: Methods and devices for fluidic-based automated regulation of liquid-suspended particles and plug removal (of particles) from possible choke points in the liquid flow channel and methods for multiple parallel particle processing are disclosed. The apparatus comprises flow channels, flow direction means, particle detectors and a control unit.

Abstract: A method for detecting, on the finish of containers, defects in a horizontal mold seal of the container includes the steps of disposing the container between a light source and a camera and ensuring the rotation of the container on itself according to one rotational revolution. The camera acquires, at each increment of rotation of the container, an image so that the number of images per rotational revolution is greater than 36. The images captured for each container are analyzed such that the profile of the finish edge is detected in each image, the profiles of the finish edge of the images are compared with a reference profile of the finish edge so as to detect deviations between these profiles, and a defect in the horizontal mold seal for a container is detected when at least one image of said container has a deviation.

Abstract: A method and system for detecting the location of a surface defect on a transparent film with respect to whether the surface defect is at a front or back surface of the film. By illuminating the surface defect with a light source from an oblique angle and capturing an image of the surface defect using a camera which is positioned along an axis where the light illuminates after unobstructedly reflected from the test surface of the film, and using the reflected light, an image of the surface defect is obtained. A computer executes an evaluation logic to determine whether the image of the defect contains any dark area. If there is a dark area present, the defect is judged to be on the front surface of the film. If there is no dark area present, the defect is judged to be on the back surface of the film.

Abstract: Various surface and structural defects are currently inspected visually. This method is labor intensive, requiring large maintenance man hours, and is prone to errors. To streamline this process, herein is described an automated inspection system and apparatus based on several optical technologies that drastically reduces inspection time, provides accurate detection of defects, and provides a digital map of the location of defects. The technology uses a sensor that includes a pattern projection generator for generating a pattern image on the structural surface and a camera for detecting the pattern image generated by the pattern projection generator on the structural surface. Furthermore, the technology utilizes an image processing and correction apparatus for performing a pattern image and structural surface defect map correction and generate a distortion corrected defect map for a surface scan area on the structure that is incident on the sensor.

Abstract: A detection method and system for inspecting a defect on a semi-reflective film by way of different light sources illuminated on the semi-reflective film along the same axis. More specifically, a P-polarized light source and an S-polarized light source are used to illuminate the defect on the semi-reflective film, with an illumination direction that is between 5-45 degrees relative to the semi-reflective film. A camera module captures an image to be inspected through the phenomenon that the P-polarized light will partially pass through the semi-reflective film, and the S-polarized light will be almost completely reflected by the semi-reflective film. During the detection, the defect is determined to be located on the front surface of the semi-reflective film when the S-polarized light is present in the image, and the defect is determined to be located on the back surface of the semi-reflective film when the P-polarized light is present in the image and no S-polarized light has entered the camera module.

Abstract: Disclosed herein is a defect inspection system using a three-dimensional (3D) measuring machine, which may include a conveying part disposed between a loading part and an unloading part and configured to hold and transfer a device, a 2D measuring machine provided to face the conveying part and configured to generate a 2D image of the device, a 3D measuring machine provided to face the conveying part in a row with the 2D measuring machine and configured to generate a 3D image of the device, and a processor configured to align and merge the 3D image and the 2D image to generate a device image and configured to determine a defect of the device on the basis of the device image.

Abstract: A system and method for fabricating a custom face mask. The system includes a factory client, wherein the factory client includes a computing device configured to receive, at a factory server and at least a user device, an image datum comprising a plurality of data of a face of a user. The computing device is further configured to map, as a function of a first machine-learning model, at least a facial landmark to a three-dimensional (3D) mesh of the image datum, map, as a function of a second machine-learning mode, a path to the 3D mesh including a boundary of a custom face mask configured for use on a user's face, generate a model file of a mold, instruct a manufacturing tool, and instruct a manufacturing device to thermoform the plastic component of the mold.

Abstract: An optical time domain reflector structure and the optical assembly is disclosed in the present invention. The optical assembly comprise an optical time domain reflector structure, a light guiding module and an optical transceiver sub-module. By disposing the optical time domain reflector structure in the optical transceiver sub-module can reduce the overall space. The optical signals emitted from the light guiding module can be reflected back to the optical fiber by the disposing of the reflection filter of the optical time domain reflector structure. Due to the two different radius of curvature of the first reflection surface and the second reflection surface of the reflection filter, the required optical signal can be completely refocused to return to the optical fiber, so that the intensity loss of the optical signals can also be reduced.

Abstract: The present disclosure provides for an apparatus for measuring optical properties of liquid samples. The apparatus includes a sample chamber and a spectrometer optically coupled with the sample chamber. One or multiple sources of electromagnetic radiation are positioned relative to the sample chamber to direct electromagnetic radiation through the sample chamber to measure the color, haze, and/or clarity of the sample. Also provided is a method for measuring optical properties of liquid samples, including inserting a cuvette containing a liquid sample into the sample chamber of the apparatus, and directing electromagnetic radiation from the one or more sources and through the sample to measure the color, haze, and/or clarity of the sample. The apparatus and methods may be used to analyze various samples, such as petroleum-based fluids, including fuels and lubricants.

Abstract: A method of producing a microfluidic chip for use in flow cytometry, the method comprising the steps of providing an opaque substrate, a first surface of which is optically smooth for visible light providing a continuous transparent layer across said first surface by vapour deposition so as to provide conformal contact between the continuous transparent layer and the first surface of the substrate providing a flow channel bounded on a first side by the continuous transparent layer and etching an aperture in a second surface of the substrate extending to the first surface of the substrate so as to provide an optical path between said second surface and the flow channel wherein the continuous transparent layer is less reactive to the etching than the substrate.

Abstract: Certain aspects pertain to a combination sensor comprising a set of physical sensors facing different directions proximate a structure, and configured to measure solar radiation in different directions. The combination sensor also comprises a virtual facade-aligned sensor configured to determine a combi-sensor value at a facade of the structure based on solar radiation readings from the set of physical sensors.

Abstract: An image capture apparatus for capturing an image of an object of medical interest in reemitted and/or reflected illumination light, for capturing an image of the object in fluorescence light generated by protoporphyrin, and for capturing an image in fluorescence light generated by indocyanine green. The apparatus includes an image sensor for capturing blue, green and red light, another image sensor for capturing fluorescence light from protoporphyrin and indocyanine green, and a beam splitter for guiding light from the object that has a wavelength shorter than a predetermined threshold wavelength ?0 to the first image sensor, and for guiding light from the object that has a wavelength longer than the predetermined threshold wavelength ?0 to the second image sensor. A filter arranged upstream of the second image sensor partially, extensively or completely suppresses light at a wavelength suitable for exciting fluorescence of indocyanine green. A corresponding method is also presented.