22 results about "Optical path length" patented technology

Provided is a self-injection locking type laser device in which variations in environmental changes, optical path length, and resonator length are less likely to occur. The self-injection locking type laser device includes a first base plate, a second base plate, a temperature adjustment element disposed between the first base plate and the second base plate, a semiconductor laser light source disposed on the first base plate, a reference resonator disposed on the first base plate, located on an optical path of laser light emitted from the semiconductor laser light source, and including at least a first mirror and a second mirror for providing optical feedback to the semiconductor laser light source, a first cover covering the semiconductor laser light source and the reference resonator and in contact with the first base plate, and a second cover covering the first cover and in contact with the second base plate.

A depth extender for an imaging system includes an optical element having a radially correlated thickness deviation proportional to an oscillation function having a first envelope and a second envelope. The first envelope has an amplitude at each of a plurality of radial distances, the amplitude being substantially equal to the difference between: (i) a reference optical path length originating from a reference ray traveling in the radial distance within the object plane between a minimum and a maximum object distance, and (ii) the optical path length of a first ray traveling in the radial distance within the object plane at the minimum object distance. The second envelope has an amplitude at each radial distance substantially equal to the difference between: (i) the reference optical path length, and (ii) the optical path length of a second ray traveling in the radial distance within the object plane at the maximum object distance.

The application relates to a fiber-optic gyroscope testing system. The system comprises a light source, a coupler with at least four end heads, a sensitive light path, a reference light path, a subtracter, an A / D module, an FPGA, a D / A module and a waveguide driver connected in sequence; the light emitted by the light source is divided into two paths by the coupler and then enters the sensitive light path and the reference light path respectively; the sensitive light path comprises photoelectric modulators, a sensitive fiber-optic ring, a coupler, a first photoelectric detector and a first preamplifier connected in sequence; the output end of the waveguide driver is in communication connection with the photoelectric modulators; the reference light path comprises a reference fiber-optic ring, a second photoelectric detector and a second preamplifier connected in sequence, and a compensation fiber with a preset length is connected in the reference light path, so that the optical paths of the sensitive light path and the reference light path are equal; the output ends of the first preamplifier and the second preamplifier are connected with the input ends of the subtracter respectively; the subtracter is used for subtracting the signal output by the first preamplifier from the signal output by the second preamplifier, so as to obtain a photoelectric signal with noise removed. The application can remove light source intensity noise and improve rotation speed demodulation precision.

The application relates to an absolute temperature calculation method and system based on an isotopic absorption spectrum line, equipment and a medium, and belongs to the technical field of temperature measurement. The method comprises the following steps: acquiring absorption spectrum lines of gas A and gas B on the same light path under the same light path and a to-be-measured temperature, and characteristic parameters of the gas A and the gas B, wherein the gas A and the gas B are different isotopic gases of the same substance; and obtaining the absolute temperature of the to-be-measured temperature according to the absorption spectrum lines and the characteristic parameters of the gas A and the gas B under the to-be-measured temperature. The method principle discards the traditional electrical temperature measurement principle, directly calculates the absolute temperature of the to-be-measured temperature based on the light absorption intensity of the different isotopic gases of the same substance, and solves the problems in the background art.

The application provides an echo wall mode microcavity magnetic sensor and a detection method. The echo wall mode microcavity magnetic sensor comprises an echo wall mode microcavity, a magnetostrictive layer and a base. The magnetostrictive layer is in contact with the echo wall mode microcavity, and the base is in contact with the echo wall mode microcavity and used for supporting the echo wall mode microcavity. The application combines the echo wall mode microcavity with the magnetostrictive layer, so that the magnetostrictive layer produces resonance under a magnetic field to produce a mechanical response, thereby changing the optical path length of the echo wall mode microcavity in contact with the magnetostrictive layer, further changing the resonance frequency of the echo wall mode microcavity, and the size of the magnetic field and the movement of the resonance frequency are in linear relationship, so that the echo wall mode microcavity magnetic sensor has high sensitivity and is suitable for different magnetic field detection, especially for biological magnetic detection with low magnetic field strength and low frequency.

The application discloses a kind of marine interface pollutant spatial distribution observation methods, it is related to marine environmental optical remote sensing monitoring technical field.The present application is according to the characteristics of sunlight spectrum sea surface reflection, selects solar sea surface glint as light source, improves the signal-to-noise ratio of spectral signal when collecting, simultaneously, the sunlight of specular reflection is no longer refracted into seawater, and will not change the atmospheric absorption structure of solar spectrum;When solar sea surface glint occurs reflection on sea surface, incident light is direct sunlight, and direct sunlight has a certain angle of incidence, so using solar sea surface glint as light source has clear observation geometry mode, can accurately calculate the optical path length of solar spectrum after absorbing near-sea surface atmospheric pollution gas, to accurately retrieve the concentration of relevant sea area near-sea surface atmospheric pollution gas, by setting equidistant observation angle in turn along the direction of solar sea surface glint, the distance resolution measurement of sea surface pollution gas can be realized.

The application relates to the technical field of solar cells, in particular to a solar cell, a laminated cell and a photovoltaic module. The groove structure located in a second region has a first pyramid on a groove bottom surface and a texture structure on a groove side wall facing a first region. Multiple reflections of incident light occur on the groove bottom surface and the groove side wall, greatly prolonging the optical path of the light in the cell, increasing the probability of light absorption, and being capable of improving the absorption of long-wavelength red light and near-infrared light. The non-pyramid texture structure of the groove side wall has a relatively small specific surface area, which is beneficial to reducing the transmission distance of carriers on the groove side wall, and further beneficial to reducing the recombination probability of the carriers, so as to improve the photoelectric conversion efficiency of the photovoltaic cell. The groove bottom surface has a relatively lower doping concentration, which is beneficial to reducing the defects of the groove bottom surface, and further beneficial to reducing the recombination probability of the carriers, so as to improve the photoelectric conversion efficiency of the photovoltaic cell.

This invention discloses a fiber-optic coupled method for measuring the average concentration of CO₂ in soil based on TDLAS technology, belonging to the field of soil gas monitoring technology. The method includes: step S1, sampling pipeline layout; step S2, optical system setup; step S3, gas balance and spectral acquisition; and step S4, average concentration inversion: the data processing module analyzes the acquired transmission spectral signal based on Lambert-Beer's law, calculates the integrated concentration of CO₂ gas in the sampling pipeline, and inverts the average CO₂ concentration at the target soil depth by combining the length of the sampling pipeline. This invention employs a horizontal long-path sampling design, which can effectively obtain the spatial average concentration of CO₂ in the soil at the target depth, avoiding the problem of insufficient representativeness of single-point sampling; the fiber optic transmission method reduces environmental interference and improves measurement stability, making it suitable for long-term, in-situ soil CO₂ concentration monitoring.

An integrated photonics arrayed waveguide multiplexing / demultiplexing device is disclosed. The device includes an array of waveguides having an incident light waveguide section including a phase correcting region, a transmitted light waveguide section, a tunable reflector, wherein each pair of consecutive waveguides in the array includes a coupler. The coupler configured to combine light from the transmitted light waveguide sections, determine therefrom an optical phase difference between the two consecutive waveguides, and wherein the couplers are further configured to determine therefrom a change in optical path length required for each of two consecutive waveguides to reach a predetermined optical phase difference, and wherein each phase correcting region is configured to apply the change to correct the optical path length of the respective waveguide.

The present application belongs to the technical field of image data processing, and particularly relates to a gas pipeline root welding quality detection method and system based on image recognition, which comprises the following steps: performing median filter pretreatment on the pipeline root image to remove noise points; analyzing the edge positioning strength of each point based on the second derivative of the pixel point and the process weight, and calculating the average edge strength of the sampling path; combining the physical distance of each pixel point and the energy dissipation coefficient to correct the light path loss, and obtaining the root welding degree; using the root welding degree, the average edge strength and the hazard sensitivity based on the pipeline design pressure to obtain the hazard score; and sending a brake instruction to the robot in response to the score exceeding the limit. The present application introduces physical compensation and pressure equal mapping mechanism, realizes quantitative evaluation and closed-loop control of the weld quality, and improves the detection accuracy.

This disclosure provides an optical interferometric proximity sensor with an optical path extender. The optical proximity sensor includes an optical path extender that extends the optical path length of the optical proximity sensor without a corresponding extension of the geometric path length of the optical proximity sensor. The optical path extender may be a high-refractive-index material positioned along the optical path through the optical proximity sensor. The optical path extender may include one or more redirection features configured to change the direction of light traveling within the optical proximity sensor. The optical path extender may include a photonic component configured to simulate the extension of the geometric path within the optical proximity sensor by applying a momentum-dependent transfer function to the light passing through it.

This invention provides a MEMS atomic gas chamber, which is a transparent, sealed cavity comprising a transparent gas chamber substrate, a transparent gas chamber top layer, and a transparent gas chamber bottom layer. The transparent gas chamber substrate includes at least one chamber. The transparent gas chamber substrate and the transparent gas chamber bottom layer are integral components or connected by laser welding, and the transparent gas chamber substrate and the transparent gas chamber top layer are connected by laser welding. Compared to existing MEMS atomic gas chamber structures, the transparent MEMS atomic gas chamber proposed in this invention has a longer optical path length and can achieve triaxial light transmission.

The present application relates to the technical field of food detection, in particular to a method for detecting the protein content in soy milk powder, comprising: obtaining the original near-infrared spectrum data of the soy milk powder sample to be detected and constructing a protein characteristic vector; calling a preset protein optical constant database storing the light absorption coefficient and refractive index under different protein concentrations, matching and then backstepping the average light path and extinction coefficient of the protein molecules to obtain light path extinction data; based on the data, establishing an absorption kinetics model to simulate the propagation process of light in the suspension and obtain the light intensity decay state, and after time integration, obtaining the cumulative absorbance proportional to the number of protein molecules; combining the dry weight of the sample to calculate the protein content per unit mass, and after environmental temperature compensation to correct the spectral drift, outputting the standardized detection result. The method can improve the accuracy and stability of the detection of the protein content in soy milk powder.

The application discloses a kind of photonic spectrum analysis methods based on Mach-Zehnder interference structure.The method includes the following steps: the color dispersion stretching of fixed heavy frequency chirp-free light pulse signal is carried out;The stretched signal is electro-optically modulated with the radio frequency signal to be measured;Make modulated light signal pass through a Mach-Zehnder interference structure, and the optical path length of the Mach-Zehnder interference structure is set as the optical path length of the chirp-free light pulse repetition period in optical fiber, so that adjacent period optical pulse interference is generated;The dispersed compressed optical signal is converted into electrical signal, and the amplitude of the electrical signal is related to the phase jump between adjacent periods of the radio frequency signal to be measured, and then the detection of the relative phase jump of the radio frequency signal to be measured is realized.The application also discloses a kind of photonic spectrum analysis devices based on Mach-Zehnder interference structure.Compared with prior art, the application can realize relative phase jump perception, thereby realizing effective detection of radio frequency signal phase information.

A fluorescence microscope includes a housing having an upper wall with an opening. A glass deck overlies the opening and is configured to seal the interior of the housing from an external environment. The glass deck includes an array of windows, and each window is configured to receive a respective specimen slide. A camera, a light source, and an optical assembly are provided within the housing. The light source is configured to generate an illumination light beam, and the optical assembly is movable to provide an optical path from the light source to the illumination light beam on a specimen positioned at each window in the array and to provide an optical path from each specimen to a fluorescence emission light beam to the camera. The optical assembly is configured such that the optical path lengths from each specimen to the camera for the fluorescence emission light beam are the same.

The application relates to the field of laser measurement technology and discloses a multi-channel synchronous length measuring system and method based on laser FMCW technology, which comprises an FMCW measuring host, a tail fiber, a fiber splitter, fiber channels and an optical lens. The FMCW measuring host divides an effective bandwidth into multiple frequency regions by utilizing the optical path length difference set by multiple fiber channels. The fiber splitter distributes a single laser signal to multiple fiber channels. The echo signal is limited in the corresponding frequency region by utilizing different fiber lengths. The FMCW measuring host extracts the up-sweep beat frequency and the down-sweep beat frequency respectively, calculates the motion speed of the length cable to be measured by combining the spatial geometric projection relationship, and calculates the cumulative production length. The application realizes the synchronous monitoring of multiple production lines by a single device through the frequency domain isolation mechanism based on the optical path difference, avoids signal aliasing, and guarantees the signal independence of multi-channel parallel measurement.

The utility model relates to the technical field of optical fiber laser, specifically relates to a kind of based on phase continuous sweep frequency optical fiber laser, including shell, the inside one side of shell is fixedly installed with the multimode pump transmitter for emitting laser source, the output end of multimode pump transmitter is provided with phase modulator, the other end of phase modulator is provided with first fiber grating, the one side of first fiber grating away from phase modulator is connected with optical fiber body, the other end of optical fiber body is fixedly connected with second fiber grating, the other side of second fiber grating is fixedly connected with the multimode pump coupler of emission gain rear laser.Compared with prior art, the utility model, by being provided with first fiber grating and second fiber grating cooperate optical resonant cavity, and in optical resonant cavity outer wrapping heat pipe, the frequency of stable optical resonant cavity is ensured the stability of laser output frequency, and optical path length drift caused by heat effect can be reduced.

The application discloses a light absorption enhanced organic photoelectric detector structure and belongs to the field of semiconductor photoelectric devices. The light absorption enhanced organic photoelectric detector structure comprises an upper MIM super surface structure and a lower plasmonic hybrid medium optical microcavity structure. The MIM super surface structure serves as a reflection layer of the whole light absorption enhanced organic photoelectric detector structure to generate local surface plasmon resonance and realize filtering or reflecting effect on incident light. The plasmonic hybrid medium optical microcavity structure can enhance the residence time or optical path of light in the organic active layer, thereby forcing the organic semiconductor to more effectively absorb the originally escaped photons. The structure of the application is helpful to improve the light absorption rate of the organic semi-active layer, solves the weak light absorption characteristic of the organic semiconductor material itself, and improves the performance of the photoelectric detector made of the organic semiconductor material.

An optical imaging device, specifically a camera, with a telephoto lens module for imaging objects is disclosed. The imaging device (100) includes an optical path length extension element (120) with a polarizing beam splitter (PBS) (121), the PBS (121) being used to split an incident beam along a first sub-optical axis into a first beam and an incident beam along a perpendicular second sub-optical axis into a second beam. The optical path length extension element (120) further includes: a first wave delayer (122a) and a first reflector (123a), arranged along the first sub-optical axis, for phase delaying the first beam and reflecting the first beam back along the first sub-optical axis; a second wave delayer (122b) and a second reflector (123b), arranged along the second sub-optical axis, for phase delaying the second beam and reflecting the second beam back along the second sub-optical axis. The PBS (121) is also used to recombine the first beam and the second beam into an outgoing beam along the principal optical axis. The imaging device (100) further includes: a lens assembly (130) for forming an image of the object in the imaging plane of the imaging device (100) according to the outgoing light beam, or for forming the incident light beam; and an imaging sensor (140) for capturing the image of the object in the imaging plane.

A measurement cuvette and a method for determining a concentration of a particulate suspension are disclosed. The measurement cuvette is formed of a fully transparent material and has an L-shaped cross section defined by removal of a rectangular notch from a square body. The method comprises introducing a particulate suspension into the cuvette and measuring absorbance at a plurality of optical path lengths including a maximum optical path length, an intermediate optical path length, and a minimum optical path length to obtain corresponding optical density (OD) values. Weighting factors are dynamically calculated based on a functional relationship among the OD values, and the OD values are combined using the calculated weighting factors to generate a final OD value representative of the concentration of the particulate suspension.

A displacement measuring device is provided. The displacement measuring device has: a light source that generates broadband light source light; a first interferometer that causes the light source light to branch and be incident on a reference surface (reference side mirror) and a measurement surface (workpiece), and causes reference light and measurement light to superimpose to generate interference light; a second interferometer that causes the interference light to branch and be incident on a first reflection surface (first mirror) and a second reflection surface (second mirror), and causes first reflection light and second reflection light to superimpose to generate spread light that spreads in a prescribed spread direction and in which a difference in optical path length changes along the spread direction; an image sensor that detects the spread light; and a calculation device that measures displacement of the measurement surface based on displacement of a peak position of an interference signal in an image detected by the image sensor.

A laser processing apparatus includes first and second laser oscillators that emit first and second laser lights (LB1), (LB2) having wavelengths different from each other, an optical fiber that guides first and second laser lights (LB1), (LB2), and laser head (50) configured to condense first and second laser lights (LB1), (LB2), respectively, at predetermined positions of a workpiece. Laser head (50) includes optical path difference generation unit (70) provided inside second housing (51). Optical path difference generation unit (70) is configured to make an optical path length of first laser light (LB1) inside second housing (51) longer than an optical path length of second laser light (LB2).