10 results about "Photon scattering" patented technology

A method of surface-enhanced Raman spectroscopy includes positioning an analyte in a field-enhancing region of a nanophotonic element, irradiating the analyte with a continuous wave excitation laser operating at a user-defined frequency in a range from near infrared (NIR) to short-wave infrared (SWIR) to generate a signal to cause photon scattering from the analyte and detecting the photons with one or more photodetectors in the SWIR. A surface-enhanced Raman spectroscopy system includes a laser operating at a frequency having a range from near-infrared (NIR) to short-wave infrared (SWIR) that emits light in a spectrum between 700 and 2500 nanometers, a nanophotonic element to receive the light from the laser, and one or more SWIR detector to detect photons scattered by an analyte on the nanophotonic element.

This invention discloses a scintillation crystal strip with an asymmetric surface configuration and its preparation method, comprising the following steps: (1) cutting and grinding a scintillation crystal blank into a crystal strip, and optically polishing all its surfaces; (2) selecting one of the following asymmetric surface configurations: end-face scattering, single-sided perturbation, or orthogonal perturbation; (3) selectively covering the polished surfaces to be retained using a masking fixture according to the corresponding surface configuration, and performing a sanding process on the uncovered predetermined surfaces until the predetermined surfaces are processed to a sanded surface. This invention innovatively proposes to perform asymmetric surface treatment on the scintillation crystal strip to construct a spatial asymmetric surface configuration, creating an anisotropic photon scattering environment inside the crystal, reconstructing the random walk of photons into a transport with a directional trend, thereby improving the light collection efficiency of the scintillation crystal strip without strictly relying on a high-performance external reflective layer, and synergistically improving the light output and energy resolution.

The invention provides a preparation method of a polymer-based radiation refrigeration material with a porous particle nested structure, and belongs to the technical field of radiation cooling energy-saving structural materials. The preparation method comprises the following steps: preparing a pre-emulsion from the polymer matrix, the diluent and the emulsifier; the polymer matrix is water-insoluble polymer polydimethylsiloxane and the like; preparing dispersion liquid from nano particles and water; adding the dispersion liquid into the pre-emulsion, and violently stirring to obtain a water-in-oil emulsion; and obtaining the polymer-based radiation refrigeration material by an emulsion template method. The internal structure of the material is composed of three photon scattering interfaces with refractive index gradients, including air / polymers, nanoparticles / polymers and air / nanoparticles, and the solar reflectivity greater than 93.0% and the atmospheric window emissivity greater than 96.0% are achieved. According to the material, the temperature is reduced by 5.0 DEG C at the lowest environment temperature in the daytime, and the maximum radiation cooling power can reach 61.0 W / m < 2 >; the temperature is reduced by 16.0 DEG C at night compared with the lowest environment temperature, and the maximum radiation cooling power can reach 105.5 / W m < 2 >.

The invention discloses a VOC gas scattering positioning imaging method based on single photon radar and Raman scattering, and belongs to the technical field of gas detection and imaging. According to the method, high sensitivity and high resolution of a single photon radar are utilized, and the feature recognition capability of Raman scattering on different gases is combined. A laser pulse with a specific wavelength is emitted and interacts with gas to generate Raman scattering, a high-sensitivity single-photon detector is used for receiving scattered photons, a high-precision timing device is used for measuring the flight time and calculating the distance, scattered photon signals are processed and analyzed through self-adaptive filtering, photon counting statistics, quantum enhancement technologies and the like, and the Raman scattering effect is achieved. Raman scattering characteristic parameters are extracted and compared with a database, so that gas types and concentration distribution are judged. And finally, carrying out two-dimensional imaging by adopting a convolutional neural network based on deep learning, carrying out three-dimensional imaging by adopting a point cloud processing algorithm based on an octree structure, and processing an image through an image enhancement and denoising algorithm. According to the invention, high-precision detection, positioning and imaging of VOC gas and water vapor are realized, the method has the advantages of high sensitivity, accurate positioning, rapid detection, strong anti-interference capability, strong gas distinguishing capability and the like, the problems of the existing detection method are effectively solved, and powerful support is provided for environmental protection and industrial safety.

The invention provides a thermal radiation refrigeration photon fiber fabric, a preparation method thereof and a wet spinning device, and belongs to the technical field of functional textile materials and radiation refrigeration. The method comprises the following steps: mixing two or more polymers which have obvious difference in dissolution behavior and viscosity in a solvent to form a spinning solution of which one phase is fully dissolved and the other phase is not completely dissolved; through a high-shear spinning device with a convergence-divergence microstructure runner and a multi-stage conical spinning assembly, a spinning stock solution is subjected to a high-shear effect in the extrusion process, remarkable velocity gradient and shear stress are generated between two phases with large viscosity difference, and a low-viscosity and incompletely-dissolved polymer phase is fibrillated and oriented; the fully dissolved polymer phase is rapidly solidified after entering a coagulating bath, a photon scattering cavity which spreads all over the fiber matrix is formed due to a phase separation effect, and finally the photon fiber with a multi-stage scattering cavity and directional microfiber synergistic structure is prepared. According to the structure, no micro-nano functional filler needs to be added, the solar reflectivity as high as 95.6% and the mid-infrared emissivity as high as 96.1% can be achieved at the same time, and an outdoor test shows that the temperature under coverage is reduced by 11.8 DEG C compared with that of a cotton fabric.

The invention discloses a scintillation crystal strip with an asymmetric surface configuration and a preparation method thereof, and the preparation method comprises the following steps: (1) cutting and grinding a scintillation crystal blank into a crystal strip, and carrying out the optical polishing of all surfaces of the crystal strip; (2) selecting one asymmetric surface configuration of an end face scattering type, a single side surface disturbance type and an orthogonal disturbance type; and (3) selectively covering the to-be-reserved polished surface by adopting a masking jig according to the corresponding surface configuration, and carrying out frosted treatment on the uncovered predetermined surface until the predetermined surface is processed to be a frosted surface. According to the invention, asymmetric surface treatment is innovatively carried out on scintillation crystal strips, a spatial asymmetric surface configuration is constructed, an anisotropic photon scattering environment is created in the crystal, and random walking of photons is reconstructed into transport with a directional trend, so that the photon scattering effect is improved under the condition of not strictly depending on a high-performance external reflecting layer. The light collection efficiency of the scintillation crystal strip is improved, and the light output and energy resolution are cooperatively improved.

A wearable module for use in an optical measurement system includes a housing and a plurality of light-receiving members. The housing includes a target-side surface configured to face a surface of a body of a user when the wearable module is worn by the user. The plurality of light-receiving members protrude from the target-side surface of the housing and are configured to receive photons scattered by a target within the body of the user and guide the received photons toward a photodetector. An extent to which each of the plurality of light-receiving members protrudes from the target-side surface is adjustable such that, when the wearable module is worn by the user, each of the plurality of light-receiving members is in physical contact with the surface of the body.

This invention relates to the field of LED manufacturing technology, specifically to an Ag reflector Mini red light-emitting diode and its fabrication method. The fabrication method includes the following steps: (1) epitaxial wafer growth; (2) substrate replacement; (3) fabrication of primary electrodes; (4) removal of the N-GaInP transition layer; (5) fabrication of a reflective layer; (6) deposition of two sets of DBR layers; (7) fabrication of pad electrodes; (8) thinning and dicing. This invention removes the N-GaInP transition layer in the epitaxial layer by ICP etching, eliminating photon scattering, absorption, and transmission losses caused by defects and dislocations in this layer, thereby improving photon emission efficiency from the root. At the same time, a composite reflective structure is formed by a high-reflectivity metal layer and a DBR layer, achieving efficient secondary reflection of photons and optical confinement, significantly improving photon reflectivity and chip brightness, and increasing the device brightness by more than 5% compared to traditional chips.

The invention provides an entangled light quantum imaging method based on coincidence count correction in a rainfall environment. The method comprises the following steps: firstly, pumping a periodically poled potassium titanyl phosphate crystal by using 405nm pump light to generate 810nm entangled photon pairs, and separating the 810nm entangled photon pairs into signal light and reference light; the signal light passes through a rainfall area to irradiate a target, and the reference light is scanned by a digital micromirror device. Then, for photon scattering and time broadening effects caused by rainfall, constructing a Monte Carlo photon tracking model, and counting a signal photon space reachable probability; thirdly, correcting the additional optical path in the raindrop based on the Cauty-Crofton theorem, converting the additional optical path into time delay, and introducing a time matching efficiency factor; and finally, establishing a coincidence count correction model in combination with geometric and time constraints, and obtaining a coincidence count value of each pixel through the model and mapping the coincidence count value into a grayscale image. According to the method, imaging degradation caused by rainfall can be effectively inhibited, so that the recovery quality and robustness of quantum imaging under severe weather conditions are improved.

The present invention relates to a simple, small, compact and portable device (1) that is sensitive to the nanoparticle visible light region in the nanocomposite medium, which is used to monitor the pH, refractive index, ionic balance of the medium, the change in the amount of photons scattered to the microbial medium and the reaction process in real time, allowing the detection of the pathogen in the sample.