151 results about "Image intensifier" patented technology

The invention discloses a speed measurement method based on single-frame multiple exposure, and belongs to the field of hypersonic velocity field measurement. The implementation method comprises the following steps: recording equal time interval change of molecular marking in a flow field along with movement of the flow field through single-frame multi-time exposure imaging of an image enhancement camera, and realizing continuous and rapid acquisition of speed information within a short time after single-time marking. The morphological position after the time interval is determined according to the molecular marker, and the velocity field with spatial resolution in the flow field is extracted by mapping the marker before and after displacement, so that the velocity measurement precision is improved. Compared with other two-dimensional velocity field acquisition methods based on femtosecond laser molecular marker tracing velocity measurement, the method provided by the invention does not need a complex focusing lens combination, can obtain spatial positions of molecular markers at different moments only through isochronous continuous triggering exposure of a camera, thereby obtaining velocity flow field displacement information. And corresponding acceleration information can be further deduced according to the obtained velocity field. The method is especially suitable for hypersonic velocity field measurement.

We present a ground-based laser system for searching, ranging, and tracking that actively illuminates small resident space objects (RSOs) in low Earth orbit (LEO) and observes position and transit-time of reflections, enabling orbital custody of most one-to-few centimeter-sized objects. A diode-pumped alkali laser (DPAL) augmented with mode-locking and Q-switching serves as an illuminator and offers exceptionally high spectral brightness due to its output beam's sub-nanosecond pulse duration and picometer-level spectral linewidth. Kilohertz fast-rastering enables interrogations of distinct few-meter-sized sky-patches at megahertz rates. Paired on the observation side with one or more telescopes outfitted with Faraday anomalous dispersion optical filters (FADOFs), image intensifiers, multi-pixel arrays, and nanosecond timing, the combined system could offer nearly background-free discoveries of RSOs every hour, even during daytime. Periodically re-flashing previously discovered objects to maintain orbit custody expends only a small fraction of total observing time.

The invention provides a noise modeling and denoising method for a low-light-level image intensifier. The noise modeling and denoising method comprises the following steps: step 1, establishing an imaging noise model for the low-light-level image intensifier; step 2, collecting output data of the low-light image intensifier under different illumination conditions, calibrating parameters of an imaging noise model, and superposing the calibrated imaging noise model on a noise-free image sample to construct a training data set conforming to actual imaging characteristics; step 3, designing an image denoising network based on the convolutional neural network, the input of the network being a noise-containing image, and the output being a noise-suppressed clean image; and step 4, training and optimizing the convolutional neural network based on the training data set, and verifying synthetic data and real data. According to the method, the adaptive capacity and generalization performance of the neural network to complex noise can be effectively enhanced, and finally, more accurate and stable image enhancement and denoising effects can be realized in a low-light imaging scene.

Image intensifier systems incorporating a microchannel plate (MCP) and methods for producing the same are disclosed. A device is disclosed that includes a first substrate having a radiation-receiving first surface and an opposed second surface through which electromagnetic radiation is transmitted. A second substrate is coupled to the first substrate to define a vacuum cavity therebetween having electron-emitting photocathode is disposed therein. A microchannel plate (MCP) is disposed within the vacuum cavity and defines microchannels extending from an input end to an output end. Each of the microchannels is configured to generate / amplify electrons in response to the electrons received photocathode. The imaging array can include a plurality of metal plates connected to capacitors and configured to collect electrons from the MCP to produce a digital image responsive to electromagnetic radiation received at the first substrate and converted to electrons by the photocathode and multiplied by the MCP.

This invention discloses an all-weather reconnaissance and alarm device, comprising a laser illumination component, an ICCD / ICMOS gating component, and an integrated processor. The laser illumination component uses high peak power pulsed laser light for illumination assistance, enhancing target brightness. The ICCD / ICMOS gating component is used to achieve high-gain photoelectric conversion of weak optical signals. Specifically, the ICCD / ICMOS gating component eliminates or reduces the influence of sunlight through "ultrafast adaptive imaging + light decay," enabling the component to operate in the linear region with the optimal signal-to-noise ratio for the target. Simultaneously, the ICCD / ICMOS gating component integrates a high-speed CCD / CMOS image sensor. Without changing the delay time, a higher image intensifier repetition frequency results in a smaller increase in delay time. Through ultra-high-speed image acquisition, it fully utilizes the energy of each laser pulse, enabling imaging of targets at different distances and high-speed moving targets. The integrated processing component focuses on controlling the ultrafast adaptive adjustment duration, the interval between auxiliary illumination and gating opening, and high-precision gain control.

We present a ground-based laser system for searching, ranging, and tracking that actively illuminates small resident space objects (RSOs) in low Earth orbit (LEO) and observes position and transit-time of reflections, enabling orbital custody of most one-to-few centimeter-sized objects. A diode-pumped alkali laser (DPAL) augmented with mode-locking and Q-switching serves as an illuminator and offers exceptionally high spectral brightness due to its output beam's sub-nanosecond pulse duration and picometer-level spectral linewidth. Kilohertz fast-rastering enables interrogations of distinct few-meter-sized sky-patches at megahertz rates. Paired on the observation side with one or more telescopes outfitted with Faraday anomalous dispersion optical filters (FADOFs), image intensifiers, multi-pixel arrays, and nanosecond timing, the combined system could offer nearly background-free discoveries of RSOs every hour, even during daytime. Periodically re-flashing previously discovered objects to maintain orbit custody expends only a small fraction of total observing time.

The invention provides a photon event camera, which comprises an acquisition module and a processing display module, and is characterized in that the acquisition module is used for acquiring photon events and comprises an image intensifier, a coupling light cone, a sensor and a gating unit; the image intensifier is used for amplifying an incident weak light signal, the coupling light cone is connected with the image intensifier and the sensor and is used for transmitting the amplified light signal, and the sensor receives and detects the amplified light signal and then outputs a detection signal; the sensor outputs a plurality of pixel event clusters generated by the plurality of photon signals as detection signals to the upper computer; the processing display module identifies a pixel event group formed by a single photon signal as a photon event, identifies a plurality of pixel event groups generated by a plurality of photon signals as a plurality of photon events, and displays and outputs the photon events corresponding to a space coordinate and a time coordinate. The method is suitable for measuring photon signals in a weak light scene, and has single-photon-level sensitivity; and the method is small in generated data volume, low in data volume and suitable for long-time acquisition.

The invention discloses a high-precision detection system and a high-precision test method for the uniformity of an output image of a low-light-level image intensifier. In the system and the method, an image output by an anode of an image intensifier is imaged on a focal plane by an optical lens, an imaging light spot is divided into two paths by a semi-transparent and semi-reflecting mirror: one path forms an imaging area observation light path through a magnifying lens and a camera or human eyes, and is used for selecting and confirming a test area and a scanning starting and ending point; the other path of light enters a high-precision detector after passing through an adjustable diaphragm, the output light current of the high-precision detector is converted into a voltage signal through a micro-current meter, and the voltage signal is acquired in real time by an acquisition card in the process that the one-dimensional operating mechanism scans along the horizontal diameter direction of the output image of the image intensifier at a constant speed, so that an output image uniformity curve is generated; and obtaining an image uniformity test value through the ratio of the maximum value to the minimum value of the curve. According to the invention, superposition errors caused by light source nonuniformity and pixel inconsistency are reduced, and high-precision and repeatable uniformity measurement consistent with human eye impression is realized by a test result.

The utility model discloses a multiple adjustment night vision lens for optical experiments, which belongs to the field of optics and comprises a low-light night vision device composed of an objective lens, an image intensifier and an eyepiece, the objective lens is connected with the eyepiece through a connecting tube, and the image intensifier is located inside the connecting tube. Compared with the prior art, the utility model has the advantages that the distance between the objective lens and the image intensifier is adjusted through the engagement connection of the displacement thread at the outer wall end of the objective lens and the translation screw at the output end of the brushless motor, and the brushless motor is controlled by the remote control system; in this way, the angle needing to be rotated can be rapidly determined according to the displacement data of the displacement thread of the objective lens, and rapid rotation is completed through the brushless motor, so that the adjustment data of the magnification of the objective lens is greatly increased.

The present invention discloses a high-resolution and high-uniformity fiber optic image inverter and its preparation method and application. The preparation method includes: preparing single filaments and sleeve light-absorbing filaments: matching a core material glass rod with a high refractive index and a cladding glass tube with a low refractive index and then performing single-filament drawing to obtain the drawn single filaments, where the filament diameter of the single filaments is Φ2.8 - 4.0 mm; matching a light-absorbing material glass rod and a cladding glass tube with a low refractive index and then drawing them into sleeve light-absorbing filaments, where the filament diameter of the sleeve light-absorbing filaments is the same as that of the single filaments; performing primary multi-filament drawing; performing secondary multi-filament drawing; hot melt pressing and twisting forming. The fiber optic image inverter has a transmittance > 70% and a transmittance uniformity < 5% in the wavelength range of 400 - 700 nm. The fiber optic image inverter can be applied to low-light level image intensifiers.

A control circuit and method 200 may be provided for regulating a luminous gain of an image intensifier. The control circuit and method may perform automatic brightness control by regulating (240) a luminous gain of the image intensifier to maintain an output brightness at or below a desired maximum output brightness level. When a sudden increase in the scene brightness causes the output brightness to exceed the desired maximum output brightness level, the control circuit and method may deactivate (250) the photocathode and interrupt the automatic brightness control, reduce (260) the luminous gain of the image intensifier in accordance with a first gain reduction parameter and after reducing the luminous gain, reactivate (270) the photocathode and resume the automatic brightness control.

The present application provides an image intensifier tube circuit board, an image intensifier tube module, and a night vision device. The image intensifier tube circuit board comprises a circuit substrate and an image intensifier tube electrical connection structure arranged on the circuit substrate. The image intensifier tube electrical connection structure comprises a positive spring contact and a negative spring contact which are fixedly arranged on the circuit substrate, and at least one of the following optionally arranged on the circuit substrate: an intermediate spring contact, a plug connector, and crown spring connectors. The arrangement of at least one of the intermediate spring contact, the plug connector, and the crown spring connectors enables electrical connection with image intensifier tubes of other models, thereby allowing compatibility with image intensifier tubes of multiple models, and allowing users to upgrade the performance of existing night vision devices by replacing existing image intensifier tubes with image intensifier tubes of different models.

There is disclosed a gated power supply for a night vision system includes an input terminal to receive source power, and output terminal to electrically couple to a photocathode, a first voltage source to source a positive or neutral voltage to the photocathode, a second voltage source to source a large negative voltage to the photocathode, and a switching circuit to switch between the first voltage source and the second voltage source on a duty cycle, wherein the switching circuit comprises an optical switch.

A method and system for determining concentricity of a multiple layer golf ball are disclosed herein. One or more images of a golf ball are generated using an X-ray source, a camera or a digital detector, and an image intensifier. An edge detection algorithm is preferably utilized. The method also includes calculating Y,Z center coordinates of the a best fit diameter or ellipse of the inner edge layer and outer edge layer of the multiple layer golf ball.

The invention discloses a high-speed flow velocity acquisition method based on stripe imaging, and belongs to the technical field of aerodynamics test. The purpose of improving the high-speed flow velocity measurement precision is achieved. A measurement system is established and comprises a femtosecond laser, a multi-pass compressor, a reflector I, a reflector II, a reflector III, a plano-concave lens, a plano-convex lens, a high-speed camera, an image intensifier, a telephoto lens, a fixed connection device, a computer device and a synchronous signal generator. Constructing a time sequence control and multi-delay gating acquisition method; calculating a scale conversion parameter; a sequential control and multi-delay gating acquisition method is utilized, an image is acquired based on a measurement system, image processing is carried out based on a corresponding relation between image pixel coordinates and actual physical sizes, and the high-speed flowing speed based on fringe imaging is calculated. The method is clear in process, high in system integration level and suitable for speed measurement under the transient high-speed flow condition, and has good engineering applicability and measurement reliability.

This invention relates to a quartz optical window for enhancing solar-blind ultraviolet detection, its fabrication method, and its application. The method includes: etching a periodic array of hollow micro / nano structures with gradually changing morphology on the emitting end face of a quartz substrate with high transmittance in the solar-blind ultraviolet band; cleaning to obtain a quartz element; depositing a solar-blind ultraviolet-transmittance thin film material as the filling material for the hollow structure on the emitting end face of the obtained quartz element; polishing the coated emitting end face to obtain a functional layer of a periodic array of micro / nano structures with a period of 100nm–300nm, a thickness of 80nm–300nm, and a duty cycle greater than or equal to 0.5; cleaning to obtain a quartz optical window for enhancing solar-blind ultraviolet detection with the periodic array of micro / nano structures. This invention improves the quantum efficiency of the cesium telluride photocathode in a solar-blind ultraviolet image intensifier by using a quartz optical window with a micro / nano structure functional layer, thereby improving the cathode sensitivity and achieving long-distance, high-definition detection.

A method and system for determining concentricity of a multiple layer golf ball are disclosed herein. One or more images of a golf ball are generated using an X-ray source, a camera or a digital detector, and an image intensifier. An edge detection algorithm is preferably utilized. The method also includes calculating Y,Z center coordinates of the a best fit diameter or ellipse of the inner edge layer and outer edge layer of the multiple layer golf ball.

The invention relates to a micro-channel plate, in particular to an electron beam focusing method of the micro-channel plate, the micro-channel plate and an image intensifier, and solves the technical problem that the spatial resolution of the image intensifier is reduced due to the fact that the existing micro-channel plate is easy to generate an electron beam spot expansion effect. According to the electron beam focusing method of the micro-channel plate provided by the invention, the insulating dielectric layer and the modulation electrode are arranged outside the output electrode of the existing micro-channel plate, and different working voltages are applied to the output electrode and the modulation electrode, so that an electric field with electron beam focusing capability is formed between the two electrodes; the electron beams emitted by each micro-channel are focused and shaped, so that the size of an electron beam spot is reduced, and the spatial resolution is improved. Meanwhile, the modulation electrode changes the electric field distribution condition at the output electrode, so that more multiplied electrons can be emitted, and the electron gain of the micro-channel plate can be improved.

The application relates to the technical field of micro-light image intensifier manufacturing, and discloses a high-efficiency semiconductor photocathode micro-light image intensifier integrated manufacturing equipment, which comprises a photocathode assembly sample feeding treatment unit and a fluorescent screen tube body sample feeding unit; the photocathode assembly sample feeding treatment unit comprises a cathode sample feeding chamber, a 200 DEG C preheating and degassing chamber, a 450 DEG C photocathode assembly degassing chamber, a transition chamber, a cesium-oxygen activation chamber and a cathode trolley taking-out chamber which are sequentially connected; the fluorescent screen tube body sample feeding unit comprises a tube body sample feeding chamber, two 450 DEG C fluorescent screen tube body degassing chambers, an electronic cleaning chamber, an assembling chamber, a multi-station press-sealing chamber and a finished product sampling chamber which are sequentially connected; the 15 vacuum chambers are arranged in a modular mode and respectively undertake different functional tasks, the double-line parallel process of the fluorescent screen tube body and the photocathode assembly supply is realized, and the production line efficiency is improved; the multi-station activation and the multi-station press-sealing can significantly improve the equipment utilization rate, and the production efficiency can be improved by more than 20 times.

The present invention discloses an exposure machine comprising a quantum dot LED screen and an image intensifier. The quantum dot LED screen has a light-emitting surface, which faces the image intensifier so that light emitted by the quantum dot LED screen is irradiated into the image intensifier. The image intensifier is configured to irradiate the light onto the image surface. The present invention can achieve a uniform light intensity distribution in the resulting image.

The invention discloses a high-voltage insulation processing method of an image intensifier. The method comprises the following steps: step 1, sleeving a high-voltage-resistant heat-shrinkable sleeve on the outer side of a high-voltage electrode wire; stripping the heat-shrinkable sleeve and an insulating layer of the high-voltage electrode wire to expose a wire core; 2, arranging a wire core, and performing button manufacturing along one direction; 3, the core heads on the two sides are connected; 4, a temperature control soldering iron is used for welding the hooking connection points, and scaling powder is smeared; step 5, completing an on-resistance test; step 6, coating epoxy glue on a welding spot, sleeving a first layer of sleeve, and performing hot blowing; sleeving a second layer of sleeve, repeating to the middle position of the first layer of sleeve, and performing hot blowing; step 7, assembling the welding spot joint in an insulating groove made of a polyimide material; and 8, wrapping ports of the first layer of sleeve and the second layer of sleeve by using silicon rubber at the same time, and fixing the wire harness at the bottom of the insulating plate. The invention has the characteristics of good insulating property, high dielectric strength, firm mechanical connection, high space environment adaptability and outstanding damage resistance.

The present application relates to image intensifier, to solve the problem that the MCP recovery time of the image intensifier cannot be measured accurately, and proposes a method for measuring the MCP recovery time of the image intensifier, comprising: arranging a CMOS camera at the output end of a fluorescent screen; generating two same period pulse signals of M1 and M2 through a signal generator to drive the same light source; closing M1 and opening M2 to obtain the original output light intensity of the fluorescent screen through the CMOS camera; synchronously outputting the pulse signals of M1 and M2, increasing the delay time between the pulse signals of M1 and M2 at certain time intervals in turn, and obtaining the corresponding output light intensity of the fluorescent screen under different delay times through the CMOS camera; closing M2 and opening M1 to obtain the corresponding pulse afterglow of the fluorescent screen under the corresponding delay time through the CMOS camera; calculating the corresponding MCP recovery degree according to the original output light intensity, the output light intensity and the pulse afterglow of the fluorescent screen, and when the value of the MCP recovery degree is equal to 1, the corresponding delay time is the MCP recovery time.

The invention belongs to the technical field of evaporation source control in a material preparation process, particularly relates to a method for regulating and controlling the evaporation rate of an antimony source by controlling parameters of an evaporation pipe, and aims to solve the problems that in the existing traditional antimony source evaporation process, factors influencing the evaporation rate are insufficiently controlled, precise regulation and control cannot be realized, and the evaporation rate is not influenced in the evaporation process. In order to solve the problems that the evaporation rate is difficult to stabilize in a specific numerical range and large fluctuation is presented due to the fact that antimony contents in different areas of an image intensifier are different due to non-uniform distribution of an antimony source in an evaporation space, the following scheme is provided: the method comprises the following steps: S1, selecting an evaporation pipe, and controlling the size precision of the evaporation pipe; according to the antimony source evaporation pipe manufacturing method, fine regulation and control over the evaporation process are achieved by controlling the structure and the manufacturing technology of the antimony source evaporation pipe, the evaporation rate can be precisely regulated and controlled, the evaporation uniformity and stability are effectively improved, and the stability and repeatability of the technology are enhanced.

The application relates to a gold wire protection device and a coupling assembly method, in particular to a gold wire protection device and a coupling assembly method of an image intensifier and an optical detector in a coupling process, which solves the problem that the gold wire is broken in the coupling of the image intensifier and the optical detector by using the existing coupling assembly method. The gold wire protection device comprises a protection device circuit, an image absorption disc and a gold wire lead-out; the protection device circuit comprises a power supply VCC, a capacitor C2, a capacitor C1, a resistor R1, a resistor R4, a triode Q2, a triode Q3, a resistor R2, a resistor R3, a triode Q1, a diode D1, a capacitor C3 and a buzzer BUZZER; the image absorption disc is used for electrically connecting the resistor R1 and a photocathode; the gold wire lead-out is used for electrically connecting the resistor R2 and a gold wire; and the protection device circuit is used for alarming through the buzzer BUZZER when the photocathode and the gold wire touch.

This utility model discloses a detection device for a low-light image intensifier, comprising a light source, an integrating sphere assembly, a dark box, and a detection component arranged sequentially. The dark box contains a clamp for mounting the low-light image intensifier, and an optical channel is provided between the light source, the integrating sphere assembly, and the dark box. The dark box includes a top plate with a mounting through-hole corresponding to the fluorescent screen of the low-light image intensifier. The detection component includes an eyepiece and a detection camera. The eyepiece is detachably connected to the mounting through-hole via a first adapter. The detection camera is located above the top plate, and a light-shielding tube is connected to its lower part. The lower end of the light-shielding tube is detachably connected to the mounting through-hole via a second adapter. This utility model integrates camera detection and visual detection into a single setup by connecting the eyepiece and the light-shielding tube of the detection camera to the same mounting through-hole via the first and second adapters, respectively, effectively improving the detection efficiency of the imaging uniformity of the low-light image intensifier.

The utility model discloses an aperture for an image intensifier and a low-light night vision device, and relates to the technical field of optical elements, systems or instruments.The aperture for the image intensifier comprises a mounting mechanism, a blade assembly and an adjusting mechanism, the mounting mechanism is used for being arranged on a light path of the image intensifier, and the interior of the mounting mechanism is through along the light path; the blade assembly is movably mounted in the mounting mechanism and is provided with a light through hole, and the light through hole is formed in a light path; the adjusting mechanism is arranged on the mounting mechanism, the adjusting mechanism is connected with the blade assembly, and the adjusting mechanism is used for controlling the blade assembly to move, so that the size of the light through hole is changed, and the luminous flux entering the image intensifier on the light path is changed. According to the aperture for the image intensifier, the luminous flux entering the image intensifier is flexibly adjusted by adjusting the size of the light through hole so as to adapt to environments with different illumination intensities, the limitation of a micropore plastic sleeve with a fixed aperture in the prior art is effectively solved, and the applicability and the reliability of a low-light night vision device are enhanced.

The invention discloses a motorized high-speed wind tunnel femtosecond laser molecular marker speed measurement system, and belongs to the technical field of femtosecond laser molecular marker speed measurement. The problem of flow field measurement of integral movement is solved. The system comprises a movable femtosecond laser source platform, a plano-convex lens, a telephoto lens, an image intensifier, a high-speed camera and a computer device, femtosecond laser emitted by the movable femtosecond laser source platform penetrates through the plano-convex lens and irradiates a flow field area to be measured, the movable femtosecond laser source platform is connected with the image intensifier and the high-speed camera, the high-speed camera is connected with the image intensifier and the computer device, the image intensifier is connected with the telephoto lens, and the telephoto lens is connected with the computer device. The telephoto lens is used for shooting a to-be-measured flow field area irradiated by the femtosecond laser. According to the invention, the femtosecond laser, the temperature control module, the sequential control unit and the light path shaping component are packaged in the same movable platform in a centralized manner, so that the measurement system has good overall stability and deployment flexibility in a wind tunnel environment.

The application discloses a cathode partition-based image intensifier local exposure time and delay calibration system and method, solves the problem that the shortest exposure time calibration of the cathode whole surface of the gated image intensifier cannot distinguish the influence of the gate pulse width and the propagation time, causes the exposure time to be unable to be accurately measured and further introduces the timing error, and the application comprises a femtosecond pulse laser, a half-transmission half-reflection mirror, a gate power module, a CMOS camera, a high-voltage power supply, a signal source, a high-bandwidth oscilloscope, a photoelectric detector and an upper computer; the influence of the gate electric pulse propagation time and the gate electric pulse half-height width on the optical exposure time is decoupled and separated, and is respectively attributed to the sub-area relative delay and the sub-area local exposure time, the time resolution capability of the gated image intensifier can be improved, and the time measurement precision can be improved when the same half-height width of the gate electric pulse is selected for the same gated image intensifier.

An ultrasound imaging system includes a probe with a head having a first width along a long axis and a transducer array at the probe head and having a second width along the long axis, wherein the first width is greater than the second width, and the transducer array is configured to generate an electrical signal indicative of received echoes. The ultrasound imaging system further includes a beamformer configured to generate a sector shaped image based on the electrical signal, an image enhancer configured to generate a graphical vertical trajectory corresponding to a vertical line from an end of the head into the sector shaped image, and a display configured to display the graphical vertical trajectory superimposed over the sector shaped image to visually distinguishes a first region of the image projecting directly under the head from a second region of the image not projecting directly under the head.

The application relates to a light-absorbing material glass for an optical fiber image transmission element and a preparation method and application thereof. The light-absorbing material glass for the optical fiber image transmission element comprises the following components in mole percentage: 68.0-78.0% of SiO2, 1.0-9.0% of Al2O3, 2.0-10.0% of B2O3, 1.0-10.0% of Na2O, 3.0-10.0% of K2O, 0.1-1.5% of MgO, 0.1-3.0% of CaO, 0.1-0.5% of SrO, 0.1-1.5% of NiO, 0.1-1.2% of Co2O3, 0.1-0.8% of MnO2 and 0.1-0.8% of Nd2O3. The light-absorbing material glass for the optical fiber image transmission element can solve the black-and-white display compatibility problem of the optical fiber image transmission element and a low-light-level image intensifier, and perfect black-and-white display compatibility with P45 fluorescent powder is realized.