8 results about "Leaky mode" patented technology

The present application relates to a kind of based on micro-nano fiber and scattering medium substrate coding element and speckle spectrometer.The coding element includes sealed cavity, micro-nano fiber and scattering medium substrate;Including drawstring transition zone and waist zone in the body of micro-nano fiber, drawstring transition zone forms leaky mode, waist zone generates evanescent field, the body of micro-nano fiber penetrates sealed cavity, so that drawstring transition zone and waist zone are located in sealed cavity;Scattering medium substrate is fixed in sealed cavity, and the waist zone of micro-nano fiber is overlapped on scattering medium substrate, scattering medium substrate is used to receive evanescent field and is coupled leaky mode to obtain scattering pattern information;Wherein, in the direction parallel to waist zone, scattering medium substrate includes more than two scattering zones, and the light transmittance of each scattering zone is different, and the difference between maximum light transmittance and minimum light transmittance is 20%~80%.Speckle spectrometer using the coding element of the present application has the advantages of small size, low cost while high spectral resolution.

An optical fiber multi-parameter sensing system and method are provided. The optical fiber multi-parameter sensing system comprises a light source, an optical circulator, a fiber-tip probe sensor and an optical spectrum analyzer, wherein the fiber-tip probe sensor can be placed into an analyte without changing the characteristics of the analyte. The variation of a bulk parameter that is a bulk refractive index of bulk environment around the fiber-tip probe sensor and a surface parameter which is a thickness of surface dielectric layer of the fiber-tip probe sensor can be determined simultaneously by monitoring the changing of resonance intensity and resonance wavelength of a single fiber-tip leaky mode resonance. The sensing system optionally configured such that multiple parameters in the analyte around the fiber-tip probe sensor can be obtained by detecting a single resonance peak.

Disclosed herein are systems and methods of determining cement integrity behind a casing string using acoustic signals in the field of well drilling and completions. Specifically, the systems and methods evaluate the interface between cement and formation and / or cement-second casing and determine the thickness of the cement. Data are processed to determine annular compression wave velocities in a cased well using a semblance method or by stacking the amplitude of the leaked A0 mode energy that has reflected from the cement-formation or cement-second casing interface. The annular compression wave velocity is necessary to convert time domain images of the annulus into radial distance domain images for better interpretation of annular conditions. A semblance method is used to determine a velocity estimate for the annulus and annular thickness. The semblance method is used for all depths and azimuths to create detailed radial distance domain images of the annulus in cased wells.

The application discloses a spectrometer based on light waveguide leakage mode light splitting and a spectrum reconstruction method thereof. The spectrometer comprises an image sensor and at least one light waveguide, the surface of the image sensor is coated with a substrate layer, the first end of the light waveguide is connected with a light source as an entrance, and the second end of the light waveguide is adsorbed on the surface of the substrate layer after being heated and drawn. The spectrum reconstruction method comprises the following steps: calibration: the photocurrent value of the sensor unit at each wavelength is saved as a spectral response function; collecting photocurrent: collecting the photocurrent value of the to-be-detected light in any sensor unit; constructing an equation set and solving: obtaining k actual spectral functions of the to-be-detected light, solving the corresponding photocurrent equation and composing a linear equation set, and solving to obtain the reconstructed actual spectral function of the to-be-detected light. The application has the advantages of small physical volume, multi-channel detection and accurate detection result.

This invention discloses a thin liquid crystal display assembly employing optical fiber light guiding. A reinforcing glass layer is located on the top layer and connected to the liquid crystal screen via a first optical adhesive layer. The first optical adhesive layer has a refractive index of 1.4-1.5 and is doped with diffused particles. An optical fiber plate is located on the bottom layer, and the optical fiber is bonded to the optical fiber plate via a second optical adhesive layer. The optical fiber includes an inner core and an outer core. One end of the optical fiber extends from the optical fiber plate to a light source coupler. The light source coupler contains a triangular pyramidal cavity for fixing the optical fiber and reflecting light, and a backlight source is disposed within the cavity for emitting light. Multiple circular holes are formed on the outer core facing the liquid crystal screen to generate a leaky mode in the optical fiber. The circular holes are denser near the light source coupler and sparser further away. This design significantly reduces the overall thickness and weight.

A multilayered sensor includes an optical waveguide and a multilayered heterostructure coupled to the waveguide that includes a plurality of concentric thin-film sorbent layers, wherein the multilayered heterostructure is one or more of: (i) structured to enable molecular sieving and filtering of the plurality of analytes within the sorbent layers of the multilayered heterostructure, (ii) structured such that at least one of the analytes will interact differently with different sorbent layers of the multilayered heterostructure, and (iii) structured to exhibit spectral dependence of penetration depth within the multilayered heterostructure of evanescent / leaky mode / lossy mode light originating from the optical waveguide. Also, method of training an inference model is provided that uses training data that comprises a combination of physics simulated synthetic data for the sensor node and empirical data for the sensor node.

The invention provides a method, a system, equipment and a medium for improving SPP microscopic imaging resolution, and the method comprises the steps: carrying out the annular shaping of light emitted by a light source through a conical lens combination, obtaining a collimated annular light spot, and focusing the collimated annular light spot to a rear focal plane of an objective lens; the collimated annular light spot is obliquely incident to a metal-substrate interface of an excitation chip in an annular wide-field plane wave mode, the incident angle is adjusted to be an SPP excitation angle, Bessel SPP is excited on the surface of a gold film of the excitation chip, and the Bessel SPP is spread along the surface of the gold film and is scattered with a nano substance; sPP scattering is converted into an optical signal, the optical signal and reflected light are collected by an objective lens together, transmitted to a far field through a leaky mode radiation effect and imaged in a CCD camera, so that the problems that the SPRM imaging spatial resolution is low due to anisotropic transmission during one-way SPP excitation, and the SPRM real-time rapid imaging is affected due to switching of the SPP excitation direction through a mechanical device are solved.

A leaky-mode acousto-optical modulator may be used to generate visual images suitable for direct viewing, without image-forming optics. To extend a field of view of the modulator to limits suitable for visual displays, an array of acoustic transducers is coupled to a waveguide along its length. Each acoustic transducer generates an acoustic wave causing a corresponding leaky mode to appear. A reflector is disposed proximate each transducer for directing the out-coupled light portion at a unique angle, providing a corresponding field of view portion for that direction. The field of view portions coalesce into a continuous synthetic field of view suitable for wide-angle visual display applications.