102 results about "Emission band" patented technology

The invention relates to the technical field of component analysis, in particular to an intermediate infrared spectrometer sensor verification system which comprises the following steps: acquiring spatial distribution information of a target sample through an automatic sampling module, and generating a corresponding first feature group based on the spatial distribution information; adjusting an emission wave band and a modulation strategy corresponding to a mid-infrared light source, converting mid-infrared photons into visible light signals, and generating a corresponding second feature group; performing down-sampling processing on the original spectral data to generate a corresponding third feature group; inputting the sparse spectral coefficient into a pre-trained deep learning reconstruction model, and dynamically correcting the reconstruction process in combination with an environment temperature compensation parameter to generate reconstructed spectral data corresponding to high resolution; and analyzing the reconstructed spectrum data, matching a preset substance spectrum database, extracting a characteristic absorption peak position and an intensity ratio of the target substance, and generating a corresponding final analysis result. According to the invention, the intelligence of the sensor verification system can be improved.

The invention provides a ratio fluorescent probe for detecting aureomycin in meat food and a detection method. After an aureomycin solution is added into the prepared Au NCs ratiometric fluorescent probe solution, a fluorescence emission band of a reaction system at 620 nm is almost unchanged, and a fluorescence emission band at 425 nm is remarkably enhanced. Meanwhile, the color of a reaction system under an ultraviolet lamp is gradually changed from red to purple along with the increase of the concentration of the aureomycin, and quantitative detection of the aureomycin can be realized by utilizing the characteristics. The detection method disclosed by the invention comprises two detection methods, one is a ratio fluorescent probe detection method, and quantitative detection is realized by utilizing linear correlation between the F425 / F620 fluorescence intensity ratio and the chlortetracycline concentration. The other method is a visual quantitative detection method, a fluorescent paper chip image is collected by using a smart phone and converted into a corresponding RGB value, and quantitative detection is realized by using a linear relationship between an R / B value and the chlortetracycline concentration. The detection method disclosed by the invention has the advantages of high selectivity, high sensitivity, simplicity in operation, obvious phenomenon and good stability and repeatability.

For example, a transmitter, e.g., for a wireless communication device, may be configured to transmit a wideband Radio Frequency (RF) Transmit (Tx) signal having a wide bandwidth of at least 80 Megahertz (MHz). For example, the transmitter may be configured to generate the wideband RF Tx signal having the wide bandwidth based on a baseband signal. The transmitter may be configured to generate the wideband RF Tx signal including a suppressed third harmonic and a suppressed fifth harmonic.

The invention belongs to the technical field of temperature sensors, and particularly relates to an up-conversion luminescence temperature sensor based on a plasmon effect and preparation and application thereof. The core of the sensor provided by the invention is a composite structure formed by a gold nanorod array and Er < 3 + > and Yb < 3 + > co-doped NaYF4 up-conversion nanoparticles, and the gold nanorod array is prepared by adopting a two-way aluminum oxide template method and is regularly and orderly arranged in a hexagonal shape. Under the excitation of 980nm near-infrared light, the local surface plasmon resonance effect of the gold nanorods can significantly improve the up-conversion luminescence intensity and accelerate the thermal response rate of the sensor; the ratio type temperature sensing system is constructed by detecting the fluorescence intensity ratio of two emission bands of 515-535 nm and 535-555 nm, self-calibration accurate detection within the temperature range of 303-348 K can be achieved, and the sensor has the advantages of being uniform in structure, controllable in preparation, high in detection sensitivity, high in response speed and the like.

The invention provides self-recovery chromium ion doped oxide mechanoluminescence fluorescent powder as well as a preparation method and application thereof. The chemical general formula of the self-recovery mechanoluminescence fluorescent powder is Al2 (1-x) O3: 2xCr < 3 + >, wherein x is equal to 0.3%-5%. The preparation method of the self-recovery mechanoluminescence fluorescent powder comprises the following steps: a, respectively weighing aluminum oxide and chromium oxide according to the molar ratio of each element in the chemical general formula Al2 (1-x) O3: 2xCr < 3 + >; b, grinding and uniformly mixing the weighed raw materials, and firing in air at the temperature of 1300 DEG C for 6 hours; and c, taking out the fired sample, and uniformly grinding to obtain the chromium ion doped oxide mechanoluminescence fluorescent powder. According to the chromium ion doped oxide mechanoluminescence fluorescent powder disclosed by the invention, a measured emission band main peak is located at 694 nm and is located at a biological first window (600-900 nm), and the chromium ion doped oxide mechanoluminescence fluorescent powder is expected to be used as a near-infrared mechanoluminescence biological probe; and the fluorescent powder has the advantages of no need of pre-irradiation and instant self-recovery of luminescence.

The invention discloses a gesture recognition control method and system for a range hood and the range hood. According to the gesture recognition control method for the range hood, two sets of infrared geminate transistor sensors are controlled to emit infrared emission signals with preset coding values in a synchronous period; acquiring the signal intensity, the signal coding matching degree and the receiving time interval of two groups of corresponding infrared receiving signals after the two groups of infrared sending signals are reflected, judging whether an effective gesture judgment condition is met or not based on the signal intensity, the signal coding matching degree and the receiving time interval, and when the effective gesture judgment condition is met, executing the step 2; if yes, the gestures currently detected by the two sets of infrared geminate transistor sensors are determined to be effective gestures, and the range hood is controlled to execute control actions corresponding to the control instructions based on the control instructions corresponding to the effective gestures; coding verification, intensity verification and sequential logic-based dual-channel correlation judgment are carried out on the two groups of infrared receiving signals, so that efficient, reliable and high-interference-resistance non-contact waving action recognition can be ensured.

The invention discloses an ultraviolet-cured polyurethane bonding material and a preparation method thereof. The ultraviolet-cured polyurethane bonding material comprises the following main components: isocyanate, polyol, trihydroxy polyether, polyester, a resin material, a filler, a catalyst, a modifier, a monomer and a solvent. The phenyl ketone, the aromatic ketone, the benzylidene and the photosensitive resin are added into the ultraviolet curing polyurethane bonding material, so that the ultraviolet curing polyurethane bonding material has relatively high sensitivity and activity, can be subjected to a polymerization reaction quickly under light irradiation, can reduce energy consumption, is good in stability, is convenient to store for a long time, and can be applied to the field of ultraviolet curing. According to the present invention, the initiator has characteristics of no toxicity, no odor and no harm to the human body, the absorption spectrum is matched with the emission band of the radiation light source, the molar extinction coefficient is high, and the phenyl ketone, the aromatic ketone and the benzylidene absorb the light energy, transition to the excitation singlet state and intersystem jump to the excitation triplet state so as to provide the high intersystem jump efficiency of the initiator;

The present invention provides an antimony-based organic-inorganic hybrid metal halide luminescent material and a preparation method thereof, which is applicable to the photoelectric field. The present invention uses 2-methylpiperazine as an organic ligand to synthesize a luminescent material with the chemical formula (C5H 14 N2)SbCl5 luminescent material, where C5H 14 N2 represents the cationic form of 2-methylpiperazine. The excitation wavelength range of this material is 250 to 400 nanometers, while its emission wavelength covers 450 to 850 nanometers, with the main emission peak at approximately 600 to 650 nanometers. The preparation method of the present invention is characterized by a simple process, low cost, and suitability for large-scale production. In addition, the luminescent material exhibits wide excitation and emission bandwidths and has high luminous efficiency. It can be widely used in the manufacture of light-emitting devices, as well as in applications such as phosphors, spectrum conversion, and display lighting.

The present invention provides a light generation system configured to provide system light; wherein the light generation system includes (i) a first light generating device, (ii) a second light generating device, and (iii) a light-emitting material device; wherein: (A) the first light generating device includes a first solid-state light source, the first solid-state light source being configured to generate first light source light having a wavelength selected from the wavelength range of 430-490 nm; wherein the first light generating device is configured to generate first device light; (B) the light-emitting material device includes a first light-emitting material, the first light-emitting material being disposed downstream of the first light source and configured to convert at least a portion of the first light source light received by the first light-emitting material into first light-emitting material light having a first spectral power distribution in the visible wavelength range, the first spectral power distribution having a first centroid wavelength (λc1); wherein the first centroid wavelength (λc1) is selected from the wavelength range of 615-645 nm; wherein the first light-emitting material light includes one or more emission bands having a first full width at half maximum (FWHM1), the first... The full width at half maximum (FWHM2) is selected from a range up to 40 nm; wherein the first luminescent material comprises a luminescent material of the type doped with tetravalent manganese, wherein M comprises an alkaline earth cation, wherein M' comprises a basic cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, and at least fluorine; (C) the second light generating device comprises a second solid-state light source; wherein the second light generating device is configured to generate second device light having a second spectral power distribution in the visible wavelength range, the second spectral power distribution having an emission band having (a) a second centroid wavelength (λc2) selected from a wavelength range of 605-655 nm, and (b) a second full width at half maximum (FWHM2) selected from a range up to 40 nm; and (D) the light generating system is configured such that (a) the first spectral power distribution and the second spectral power distribution at least partially overlap, (b); and (c) in the operating mode of the light generating system, the system light comprises (i) the first luminescent material light and (ii) the second device light.

The present invention discloses a Cu<supgt;2+< / supgt> - Li<supgt;+< / supgt> co-doped gallate fluorescent material with tunable afterglow. This material is a novel optical material with a wide emission band (~230 nm) and long afterglow performance (~20 min). In addition, with the addition of Li<supgt;+< / supgt>, the emission intensity is enhanced (6.62 times), the defect concentration is increased (3.6 times), and the afterglow time is extended (~20 min), thus realizing the process of tunable afterglow. The afterglow modulation defect engineering strategy in the present invention may further inspire innovative ideas for the preparation of high-performance optical information storage and encryption high-performance long afterglow materials.

This disclosure provides a planar resonant cavity for a planar gyrotron and a method for increasing its output power, relating to the field of microwave technology. The planar resonant cavity includes: a resonant cavity for increasing the energy of electromagnetic waves; wherein the energy of the electromagnetic waves gradually increases based on the interaction between the electron beam and the electromagnetic wave; electron emitting surfaces, respectively disposed at the upper and lower ends of the cavity surface in the negative Z direction, for emitting electron beams; wherein the electron emitting surfaces at the upper and lower ends of the cavity surface are symmetrical based on both the central YZ plane and the central XZ plane of the resonant cavity; and baffles, including a left baffle and a right baffle, the left and right baffles having identical structures, respectively disposed in the X direction of the resonant cavity between the electron emitting surfaces and the two ends of the resonant cavity, for reflecting electromagnetic waves to enhance the interaction between the electron beam and the wave, increase the energy of the electromagnetic waves, and increase the output power of the electromagnetic waves.

The present invention is applicable to the technical field of fluorescent materials and provides a broadband near-infrared sulfide luminescent material excited by blue light. The chemical formula of the luminescent material is SrSc 2‑2x Cr x S4, wherein 0.0025≤x≤0.015. The present invention also provides a method for preparing a broadband near-infrared sulfide luminescent material excited by blue light. The present invention also provides an application of a broadband near-infrared sulfide luminescent material excited by blue light. 3+ Cr 3+ Ion substitution, with Cr 3+ Ion substitution of Sc 3+ The emission intensity of the ions changes accordingly and can be effectively excited by blue light. The optimal emission wavelength is at 1030nm, which is derived from Cr 3+ of 4 T2→ 4 The electronic transition of A2 produces high-efficiency near-infrared broadband emission with a half-width of 225nm under 468nm blue light excitation; the raw material resources used are abundant, the preparation method is simple and easy, the physicochemical stability is good, the fluorescence lifetime is ideal, it is green and pollution-free, and it has strong applicability. In addition, the emission bandwidth and emission wavelength are long, and it can be widely used in the field of near-infrared spectroscopy technology.

The invention provides a light generating system (1000) comprising a first light generating device (110) and a control system (300), wherein the first light generating device (110) comprises a first solid state light source (10), a second solid state light source (20), and a luminescent converter (2000), wherein: (A) the first solid state light source (10) is configured to generate first light source light (11) having a first peak wavelength (λp1) selected from the range of 400-490 nm; (B) the second solid state light source (20) is configured to generate second light source light (21) having a second peak wavelength (λp2) selected from the range of 470-540 nm; wherein λp2 - λp1 ≥ 20 nm; (C) the luminescent converter (2000) is configured in a light receiving relationship with the first and second solid state light source (10,20); wherein the luminescent converter (2000) comprises a first luminescent material (210) and a second luminescent material (220); (D) the first luminescent material (210) comprises a luminescent material of the type M'xM2-2xAX6 doped with tetravalent manganese, wherein M' comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert at least part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); (E) the second luminescent material (220) is configured to convert at least part of the second light source light (21) received by the second luminescent material (220) into second luminescent material light (221); wherein the second luminescent material light (221) has a second centroid wavelength (λc2) selected from the range of 600-660 nm; wherein the second luminescent material light (221) comprises at least one emission band having a second full width at half maximum FWHM2 of ≥ 40 nm; (F) the first light generating device (110) is configured to generate first device light (111); wherein in an operational mode of the first light generating device (110), the first device light (111) comprises one or more of the first luminescent material light (211) and the second luminescent material light (221); wherein the first device light (111) has a first device centroid wavelength (λcd1) selected from the range of 600-660 nm; and (G) the control system (300) is configured to control a spectral power distribution of the first device light (111) by controlling the first solid state light source (10) and the second solid state light source (20).

The invention provides a light generating system (1000) configured to generate in a first operational mode of the light generating system (1000) system light (1001), wherein: the system light (1001) in the first operational mode has a spectral power distribution with at least 85% of the spectral power in three emission bands (111,121,131) comprising (i) a first emission band (111) having a centroid wavelength of 445 nm + / −25 nm and having a full width half maximum of at maximum 25 nm, (ii) a second emission band (121) having a centroid wavelength of 541 nm + / −25 nm and having a full width half maximum of at maximum 150 nm, and (iii) a third emission band (131) having a centroid wavelength of 614 nm + / −25 nm and having a full width half maximum of at maximum 25 nm; in the first operational mode the light generating system (1000) is configured to control the spectral power distribution of the system light (1001) in dependence of a radiant flux of the system light (1001) while maintaining a correlated color temperature of the system light (1001) within + / −10% of a predetermined correlated color temperature value; and in the first operational mode the light generating system (1000) is configured to shift a color point (1010) of the system light (1001) towards a lower Duv with decreasing radiant flux of the system light (1001) or to shift the color point (1010) of the system light (1001) towards a higher Duv with increasing the radiant flux of the system light (1001).

The invention provides a light generating system (1000) comprising a first solid state light source (10) and a luminescent converter (2000), wherein: (A) the first solid state light source (10) is configured to generate first light source light (11) having a first peak wavelength (λpi ) selected from the range of 490-520 nm; (B) the luminescent converter (2000) is configured in a light receiving relationship with the first solid state light source (10); wherein the luminescent converter (2000) comprises a first luminescent material (210); wherein the first luminescent material (210) comprises a luminescent material of the type M'XM2-2XAX6 doped with tetravalent manganese, wherein M' comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, and wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); wherein the first luminescent material light (211) has a first centroid wavelength (λci) selected from the range of 610-650 nm; wherein the first luminescent material light (211) comprises at least one emission band having a first full width at half maximum FWHM1 of ≤ 55 nm; and (C) the light generating system (1000) is configured to generate system light (1001) comprising the first luminescent material light (211) and at least part of the first light source light (11); wherein the system light (1001) is white light having a correlated color temperature selected from the range of 1500-3400 K.

The invention relates to the technical field of chemiluminescence probes, in particular to a synthesis method and application of a boron dipyrromethene framework near-infrared two-region chemiluminescence probe based on X-ray activation, and the chemical structural formula of the chemiluminescence probe is shown in the specification. A novel BODIPY compound which is high in quantum yield and has a strong or narrow emission band is used as a chemiluminescence substrate for a core framework, a core framework of an electron withdrawing group with longer emission wavelength, an electron donating group and two molecules with larger wavelength overlap ratio are subjected to one-time CERT effect to be efficiently combined into a single molecule, and 1,050 nm chemiluminescence which is higher than 970 nm is emitted.

The present invention discloses a ratiometric fluorescent probe for detecting SO2 derivatives and its synthesis method and application. The fluorescent probe has the molecular formula C 41 H 44 ClN5O8. The fluorescent probe provided by the present invention can specifically recognize SO2 derivatives and undergo nucleophilic addition reaction, thereby blocking the ICT effect inside the oxonium structure, and then blocking the FRET effect, showing a transition from red fluorescence to green fluorescence. The optical properties of the probe are excellent: it has a 191nm emission band gap, which can effectively avoid the occurrence of fluorescence overlap; high specificity to avoid interference from other substances; and excellent sensitivity, with a detection limit of 64μM. In addition, when the Na2SO3 concentration is in the range of 0-50μM, it is proportional to the fluorescence ratio of the probe, R 2 >0.99, which means that the Na2SO3 concentration can be quantitatively calculated based on the fluorescence ratio within this range.

The present invention relates to an in-operando and non-destructive testing system (10) for testing the aging of at least one electrochemical element of a battery, the in-operando and non-destructive testing system (10) comprising: - a cavity (30); - a source (24) configured to emit L-band electromagnetic waves toward the cavity (30), the cavity (30) comprising a cylindrical resonator (38) with a circular base and having at least one longitudinal cut-out (46, 48); - a detector (28) capable of detecting the waves originating from the cavity (30); and - a processor (34) capable of analyzing the waves detected by the detector (28) in order to obtain at least one item of information relating to the aging of the at least one electrochemical element.

The invention relates to the technical field of intelligent display rack control, and discloses an intelligent display rack remote management and control system based on the Internet of Things, and the system comprises the steps: firstly obtaining the physical attributes and arrangement information of commodities displayed on an intelligent display rack, and constructing a commodity lattice display topology representing the periodic distribution of a medium space according to the physical attributes and arrangement information; thirdly, an electromagnetic forbidden band is calculated based on the topology, a terminal to be controlled is regarded as a dielectric structure defect in the topology, and a localization defect mode strictly existing in the frequency range of the electromagnetic forbidden band is solved; and in the execution stage, the remote control end accurately tunes the carrier center frequency of the wireless transmission signal to a frequency value corresponding to the localization defect mode, and strictly configures the transmission bandwidth according to the quality factor of the mode. And finally, electromagnetic energy of the control instruction is directionally focused and coupled to the to-be-controlled terminal by using a resonance excitation transmission mechanism of the localized defect mode, so that the communication shielding limitation of a high-density display environment is broken through.

The invention discloses a dual-response near-infrared fluorescent probe as well as a preparation method and application thereof, and relates to the field of detection. The method eliminates pretreatment requirements by utilizing spectral separation between the probe absorption / emission band and the background absorption / emission spectrum of the edible oil. By directly mixing the probe with an oil sample, quantitative detection of frying time and edible oil adulteration rate can be realized. The probe is short in detection time (incubation for 10 minutes) and high in sensitivity (the detection limit is as low as 0.45%), and has been successfully applied to analysis of various edible oils. In addition, through model construction and experimental verification, contribution of viscosity and pH value changes to probe signal response is clarified. The probe has the advantages of high sensitivity, short response time and no need of sample pretreatment, so that the CO660 becomes a new tool for evaluating the quality of the frying oil in real time, and is expected to meet the key requirements of food safety supervision and industrial quality control.

The invention relates to the technical field of LED illumination, and discloses a multi-color LED lamp filament which comprises the following components in parts by mass: 80-95 parts of a rare earth composite luminescent material; the quantum dot auxiliary spectrum adjusting layer accounts for 2 to 8 parts by mass; the optical microstructure coating accounts for 3 to 8 parts by mass; the thermal management coating accounts for 5 to 10 parts by mass; the wire base body adopts a gold wire or an alloy wire, the rare earth composite luminescent material comprises a matrix material and a rare earth activating agent, and the matrix material is selected from red fluorescent powder with the emission wave band of 580-700 nm, yellow fluorescent powder with the emission wave band of 540-580 nm, green fluorescent powder with the emission wave band of 480-540 nm, blue fluorescent powder / purple fluorescent powder with the emission wave band of 400-480 nm, silica gel and epoxy resin. Through the optimized design of the multi-layer composite structure, complete coverage of the spectrum and remarkable improvement of the lighting effect are achieved, and the light loss is effectively reduced.

This invention discloses a rapid method for detecting CTCs, belonging to the field of tetracycline detection technology. The invention uses a fluorescence spectrometer to measure the fluorescence intensity of the test solution containing fluorescent probes PEI-CuNCs and a surfactant. Compared with the fluorescence intensity of PEI-CuNCs, if a new blue fluorescence emission band appears at 425 nm and the blue-green fluorescence at 500 nm decreases, then the test solution contains CTCs. The detection method of this invention has advantages such as simple operation, speed, high sensitivity, good selectivity, low detection limit, and low cost. It does not require large-scale instruments or professional operators, and shows good spiked recovery rate in actual water sample testing, with reliable detection results and excellent practicality.

The invention relates to the technical field of operation parameter analysis and processing, and discloses a life detector operation parameter intelligent analysis system and method based on image recognition. Life detector rescue detection existing vital sign image data are scientifically preset, and intelligent analysis of a radar life detector electromagnetic wave emission decomposition frequency rescue detection result is carried out in combination with an intelligent identification algorithm and rescue detection electromagnetic wave emission band decomposition frequency detection image parameters. Accurate detection of the rescue detection effect of the electromagnetic wave emission frequency of the radar life detector is realized; and according to the rescue detection electromagnetic wave emission wave band decomposition frequency detection result analysis parameter, the intelligent search algorithm and the rescue detection electromagnetic wave emission wave band decomposition frequency parameter are combined to intelligently screen the optimal electromagnetic wave emission frequency of the rescue detection operation of the radar life detector. The intelligent screening of the optimal operation working parameters of the radar life detector is realized, and the rescue detection quality and efficiency of the radar life detector are improved.

The present invention relates to the technical field of ring transducers, and particularly relates to a design method for a multi-excitation broadband ring transducer with a low water permeability coefficient and a low sound insertion loss. By using two rings with the same outer diameter and height but different inner diameters, they are made to operate at two different frequencies f1 and f2 respectively; when in use, the two rings are connected in series or in parallel, and the resonance frequencies of the two rings themselves are coupled to expand the receiving or transmitting bandwidth. In the state where the two rings are connected in series, the anti-resonance frequencies of f1 and f2 are coupled to expand the receiving bandwidth. In the state where the two rings are connected in parallel, the resonance frequencies of f1 and f2 are coupled to expand the transmitting bandwidth; through the design method, the purpose of multi-excitation coupling to expand the bandwidth is achieved while the external dimensions of the transducer remain unchanged.

A microcavity pixel array device and method of manufacture having a shared multi-DBR system configured to cover a broad spectral bandwidth range. A wide emission band is achieved by depositing a first DBR on top of an OLED array and subsequently depositing a second DBR on top of the first DBR, where each DBR has a unique design. The multiple DBRs cover a wider spectral bandwidth range than a single DBR, and therefore almost total reflection is achieved for a series of OLEDs designed at different color wavelengths.

The application discloses a red and near-infrared emission rare earth-based fluorescent powder and belongs to the technical field of luminescent materials. The application adopts a high-temperature solid-phase method to prepare the red and near-infrared emission rare earth-based fluorescent powder, and the chemical formula is Bi2Er (1‑x) O4Cl:xB; wherein 0.01<=x<=0.1; the element B is one of Li, Na and K. 3+ The element Er 3+ serves as a sensitized ion and a luminescent center ion. Different from a general up-conversion luminescent system which has multi-band emission in visible light, the red and near-infrared emission rare earth-based fluorescent powder has single-band red light emission in visible light, the luminescence is enhanced by 3.2 times, the emission range is wide, and the emission band covers a red light region of 630nm-730nm and a near-infrared region of 1500nm-1600nm. The near-infrared region has strong emission and thermal stability. In addition, the red and near-infrared emission rare earth-based fluorescent powder has low biological toxicity.

This invention discloses a sonar signal bandwidth extension method and system based on an adaptive sparse reconstruction approach. It acquires frequency domain data of active sonar echoes through matched filtering and extracts the transmission bandwidth range of the active sonar. A physical perception dictionary containing the physical ripple characteristics of the transmitted waveform is constructed to establish a precise mapping from the sparse target space to the observation frequency band. An adaptive threshold detection mechanism is introduced during the orthogonal matched pursuit iteration process to screen potential targets using the statistical characteristics of local background noise. A meshless global optimization algorithm is used to jointly fine-tune the target position in the continuous time domain. A full-band skeleton spectrum is constructed using precise parameters, and the noise residuals in the original frequency band are back-injected and inversely transformed to obtain a high-resolution time-domain waveform. This invention significantly improves the ability to distinguish closely spaced targets and the detection performance of weak targets in complex underwater acoustic environments.

An impulsive wave device for treating a vascular occlusion is described. The impulsive wave device includes an outer covering and an inner member connected at a distal end of the device. First and second conductive wires extend along a length of the device within a volume between the outer covering and the inner member. A conductive launch band surrounds the ends of the first and second conductive wires to form a first spark gap between the end of the first conductive wire and the launch band and a second spark gap between the end of the second conductive wire and the launch band. First and second impulsive waves can be initiated from the first and second spark gaps when the volume is filled with a conductive fluid and a high voltage pulse is applied across the first and second conductive wires.

An optical waveguide combiner with an output coupler comprising an array of embedded partially reflective dielectric mirrors that expand and couple a virtual (optionally, color) image generated by a laser display engine into a user EMB, wherein the dielectric mirrors are configured to have: a wavelength band for each laser emission band of the laser display engine, the wavelength band including wavelengths of light in the laser emission band and in a wavelength range in which the laser emission band is expected to drift; a reflectivity angular range exhibiting a first reflectivity; a transmittance angular range exhibiting a second reflectivity less than the first reflectivity; and a see-through angular transmittance range having high transmittance for natural light incident on a facet.