11 results about "High contrast imaging" patented technology

This invention discloses a beam expander lens for laser scanning projection, relating to the field of laser projection display technology. It includes a first lens group, a second lens group, a third lens group, and a fourth lens group, arranged sequentially along the optical axis. These four lens groups together form the complete lens. The first, second, third, and fourth lens groups are arranged in a positive-negative-negative-negative optical power configuration. Through innovative optical architecture and optical power allocation, a large-angle beam expander function is achieved within a space of less than 35mm in total length, greatly saving internal space. By utilizing the chromatic aberration correction capability of the first lens group and the aberration correction capabilities of the second, third, and fourth lens groups, high-contrast imaging is achieved across the entire field of view and wavelength range, with concentrated dot matrix energy, meeting the requirements of high-resolution projection.

Disclosed in the present invention are a simple phenolic acid derivative- and rosmarinic acid derivative-based multimodal imaging probe and a use thereof. The multimodal imaging probe of the present invention has a structure selected from those represented by formulas (I to III). By subjecting phenolic acids such as danshensu, caffeic acid, ferulic acid, and rosmarinic acid to derivatization modification and by means of molecular imaging technology, the present invention realizes in vivo tracing and imaging of diseases such as various tumors (liver cancer, pancreatic cancer, and breast cancer), stroke, myocardial infarction, and acute kidney injury, and achieves in vivo and in vitro high-contrast imaging, real-time monitoring, and qualitative and quantitative evaluation. Moreover, the probe of the present invention itself has good metabolic properties and targeting performance, is simple to prepare and low in cost, and has broad clinical application prospects.

This invention belongs to the field of acoustic detection technology for partial discharge in power equipment, and relates to an array-type acoustic imaging partial discharge detection method and system. The method includes: establishing the correspondence between channel identifier sequences and array geometric parameters; dividing the array into subgroups according to a fixed subgrid and generating a synchronous sampling time sequence to acquire multi-channel pulse density modulation signals; demodulating and extracting the signals, bandpass filtering and pulse framing; constructing a forward-backward spatial smoothing covariance matrix and using minimum variance distortionless response beamforming to calculate the spatial spectrum to generate an acoustic image; and registering and superimposing the acoustic image with a visible light image to output the positioning result. The technical solution of this application achieves high-contrast imaging and stable positioning output through temporal and geometric consistency constraints, which can improve the consistency of on-site interpretation and meet the requirement of repeatable positioning under weak partial discharge ultrasonic conditions.

The utility model discloses a near-infrared lymph node detection system. The detection system comprises an infrared imaging system, the infrared imaging system comprises an excitation light source, a beam expanding element, a light path forwarding device, a light filtering device and a short-wave infrared sensor which are arranged along a light path, and an image processing and displaying device which is in communication connection with the short-wave infrared sensor; wherein the excitation light source is a continuous spectrum light source or a wavelength continuously adjustable light source. According to the utility model, based on a near infrared spectrum imaging technology known as a biological transparent window, image processing is carried out in combination with a model algorithm, and an innovative solution is provided for lymph node detection; according to the system, the low tissue scattering characteristic of a near-infrared window and the absorption peak difference characteristic of main biological components in a near-infrared spectrum are utilized, and high-contrast imaging of lymph nodes and surrounding adipose tissues is achieved without a tracer agent. The detection system provided by the utility model can provide real-time guidance and tracking for related operations.

The application discloses a kind of magnetic resonance non-enhanced lower limb arteriovenous combined imaging method, belong to medical image technology field, including S1, judging acquisition times, and carrying out first acquisition, S2, set the delay time of data acquisition, S3, configure fast interrupt steady state, and carry out data acquisition, S4, repeat S1-S3 until all regions are completed first acquisition Data collection process, S5, switch to second acquisition, and judge acquisition times, and carry out second acquisition, S6, using the same process as S2 and S3 carries out data acquisition, S7, repeat S5 and S6 until all regions are completed second acquisition Data collection, S8, image reconstruction is carried out, and the arteriovenous separation image map is obtained, the application uses above-mentioned method, by fusing fast interrupt steady state sequence and golden angle radial sampling track, realize lower limb arteriovenous synchronous high contrast imaging under the condition of not needing electrocardiogram control.

The invention discloses an optical lens combined with a heterogeneous scattering unit array and a design method of the optical lens, which are applied to the field of optical elements, and aims to solve the technical problem that the existing optical lens is difficult to consider both central vision definition and peripheral defocus intervention efficiency. A personalized optical model is constructed according to the eye axis length, pupil dynamics and eye using behaviors of a user, a center area, a transition area and a peripheral area are divided, a sparse scattering unit, a gradient transition unit and a high-density strong scattering unit are configured respectively, the form, the size and the arrangement of the units are reversely deduced through a multi-target optimization algorithm, and a multi-target optimization model is constructed. Cooperative optimization of central high-contrast imaging and peripheral myopia signal enhancement is realized, intervention efficiency and wearing comfort are remarkably improved, a pupil adaptive adjustment layer is introduced, a scattering path is dynamically modulated to adapt to different illumination and visual tasks, and the performance of the lens can be dynamically adjusted according to the physiological state and eye use scene of a user.

The application discloses a 7-azaindole photoacoustic imaging probe for detecting superoxide anion, a preparation method and application, and the photoacoustic imaging probe is named AIH-OTF, which is a blue-green solid prepared from methyl trifluoromethanesulfonate, dye AIH-OH and the like; the AIH-OTF realizes high-contrast PA imaging of endogenous superoxide anion in living cells, and in-situ evaluation of occurrence and repair of acetaminophen-induced liver injury is also determined through non-invasive monitoring of the PA reaction of AIH-OTF to superoxide anion; the AIH-OTF probe can be used as a useful tool for accurately diagnosing drug-induced liver injury in vivo. The photoacoustic imaging probe can realize real-time detection of in-vivo superoxide anion through AIH-OTF and the ability of diagnosing DILI; the cell toxicity is small, the biological compatibility is good, and the photoacoustic imaging probe can be used for in-vivo imaging of occurrence and repair of DILI.

The invention discloses a water-soluble tetrasulfonic aza boron fluoride dipyrrole near-infrared fluorescent dye as well as a preparation method and application thereof. The fluorescent dye has the following structure: R is selected from-(CH2) nSO3-, and n is an integer greater than or equal to 2 and less than or equal to 6. The water solubility is remarkably improved through tetrasulfonic acid group modification, the fluorescent probe shows high fluorescent brightness in a water solution, the maximum emission wavelength is about 725 nm, the fluorescent probe is located in a biological tissue optical window, and high-contrast imaging of deep tissue is facilitated. Compared with clinical indocyanine green (ICG), the water solubility, the fluorescence quantum yield and the light stability are remarkably improved, the molar extinction coefficient is high, and the photobleaching rate is low; the synthesis route is simple, the repeatability is good, the product is easy to purify, and the biocompatibility is good. The dye is applicable to real-time navigation, tumor imaging and blood vessel visualization in fluorescence-guided surgery, and shows excellent clinical application potential and industrialization prospect.

The invention discloses an annular pupil modulation high-contrast coronagraph transmittance smooth design and a working method. According to the method, circular radial transmittance gradient modulation is carried out on the pupil of the telescope, and suppression of strong diffraction light of a fixed star is realized. According to the pupil modulation design concept with the gradually-changed circular ring band transmittance, limited circular rings are adopted, the transmittance of each circular ring is the same, energy distribution of a fixed star at the pupil position of an optical system is changed by further restraining the transmittance difference between the adjacent circular rings, and the optimal high-contrast imaging performance is achieved. According to the modulation band, the transmittance design curve of the modulation band is integrally smooth by restraining the transmittance difference of adjacent bands, the manufacturing process problem caused by violent transmittance jump of a traditional optical filter can be solved, the machining precision is further guaranteed, and the problems of wavefront phase jump and the like caused by sudden change of the thickness of a film layer can be solved; and the high-contrast imaging performance of the whole system is finally improved.

The application discloses a kind of high contrast imaging wave front detection and correction method and system, this method uses FPGA and CPU hybrid programming architecture to realize high-precision high contrast imaging wave front detection and correction, locking is realized to high contrast imaging dark area in closed-loop correction, wherein, high-precision wave front slope calculation is completed in FPGA, sub-aperture image division and wave front recovery calculation are realized in CPU, and voltage control deformable mirror correction wave front aberration is output.The application uses hybrid programming architecture to carry out high contrast imaging wave front detection and correction, realizes high-precision wave front detection and correction, solves the problem of insufficient performance of CPU for aerospace, and then realizes the locking of high contrast imaging dark area of space coronagraph, for direct imaging detection of exoplanet.After wave front detection and correction, the energy stability of high contrast imaging dark area can be guaranteed, and dark area locking is completed.

The invention provides equipment for representing surface flatness of a liquid crystal substrate, which comprises a measuring box body, feeding windows are arranged on the front surface and the back surface of the measuring box body, elastic lifting baffles are assembled in the feeding windows, and a material conveying assembly is fixedly mounted on the inner wall of the measuring box body at the positions of the baffles; material loading devices are fixedly installed at the bottom in the measuring box body and located on the two sides of the material conveying assembly, a detection device is fixedly installed on one side of each material loading device, a color developing assembly is fixedly installed on the portion, on the other side of each material loading device, of the measuring box body, and a shooting assembly is fixedly installed at the top of the measuring box body above the color developing assembly; and an irradiation assembly is fixedly mounted at the top of one side in the measuring box body. According to the invention, a high-contrast imaging background is provided for flatness projection of the substrate through the gradient bottom color layer coated on the surface of the bottom cloth in the color developing assembly, the flatness difference of the surface of the substrate can be clearly presented, the imaging blurring is avoided, and a high-quality visual material is provided for subsequent picture analysis.