100 results about "Image intensifier" patented technology

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.

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 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.

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 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 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 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.

The invention discloses a range gating imaging system based on pulse phase shift. Comprising a digital control unit used for generating M laser pulse signals and shutter control signals, M laser driving modules, M groups of laser diodes, and an optical fiber beam combiner used for combining laser output by each group of laser diodes, the imaging unit receives a shutter control signal and comprises an image intensifier and a driving module thereof, and the image intensifier and the driving module are used for performing gating imaging on a target under the control of the shutter control signal; wherein M is greater than or equal to 2, repetition frequencies of the laser pulse signals are the same, but phases have difference values; each laser driving module is connected with a laser pulse signal output end of the digital control unit; and each group of laser diodes is connected with one laser driving module, and each group of laser diodes outputs laser under the driving of corresponding laser pulse signals.

The utility model relates to the field of optical imaging and mechanical design, and discloses a single-lens light-incoming multi-Cmos imaging device, which comprises an optical focusing lens, an image intensifier is arranged at the bottom of the optical focusing lens, an installation assembly is arranged at the bottom of the image intensifier, the installation assembly is provided with a focusing lens and a CMOS base, and the focusing lens and the CMOS base are arranged on the optical focusing lens. The focusing lens is arranged at the bottom of the image intensifier, and the CMOS base is arranged at the bottom of the image intensifier. According to the utility model, through the sizes of imaging visual angles of a plurality of CMOS, the light inlet amount of the aperture, and the adoption of the CMOS of the same specification when a plurality of cameras are used for image acquisition, when image fusion is carried out, the image size and the data flow size can be unified, the fused image does not deviate, the difficulty of later software algorithm repair is reduced, the image quality is improved, and the image noise is reduced; meanwhile, the light incoming amount, the imaging focal length and the image size of the CMOS needing image fusion are unified, and image fusion can be more accurate.

The application relates to a high-precision optical fiber micro-hole precise coupling device and method, and relates to space high-energy cosmic radiation detection facilities, and is used for solving the problem that the micro-hole alignment precision cannot meet the mu m level in the existing space high-energy particle detection experiment, and the CMOS camera and the optical fiber micro-hole plate adopt a common fixed mechanical assembly structure. The high-precision optical fiber micro-hole precise coupling device comprises an integrated image intensifier assembly and an optical fiber micro-hole plate assembly, and is used for mounting the integrated image intensifier and the optical fiber micro-hole plate to be coupled; the integrated image intensifier assembly and the optical fiber micro-hole plate assembly are matched, and the high-precision coupling of the integrated image intensifier and the optical fiber micro-hole plate can be realized; the application has the advantages of high coupling efficiency and simple operation.

The invention discloses a high-adhesion anode fluorescent screen and a manufacturing method thereof, and relates to the technical field of low-light-level image intensifier core component manufacturing, the high-adhesion anode fluorescent screen comprises a fluorescent screen, the fluorescent screen is made of glass or a sapphire substrate, the fluorescent screen is provided with a micropore array structure, the micropore array structure comprises a plurality of micropores arranged in an array, the aperture of each micropore is 5-10 [mu] m, and the diameter of each micropore is 5-10 [mu] m. The hole depth is 3-5 microns, the hole pitch is 1-2 microns, fluorescent powder is filled in each micropore, and the fluorescent powder is made of P43 or P45 fluorescent powder. According to the invention, the micropore array can form an anchoring structure, the fluorescent powder slurry is coated, the holes are filled with the particles and the binder, and the fluorescent powder layer and the substrate are locked; the stripping tendency of the fluorescent powder layer caused by thermal expansion and cold contraction, vibration or external stress is resisted through geometric constraint, and interaction force is generated with internal stress of the fluorescent powder layer, so that adhesion is enhanced; a narrow-band efficient fluorescent material is selected to cooperate with the micropore light regulation effect, the efficient light-emitting characteristic of the fluorescent powder is enhanced, a mature manufacturing process combination is combined, and breakthrough improvement of the performance of the fluorescent screen is achieved.

An image intensifier assembly has an image intensifier tube having a optical element. The optical element includes a emitting surface. The optical element comprises an outer dimension. The image intensifier assembly further includes a first power supply comprising a first circuit board having a first inner dimension defining an opening, a first outer dimension and a first thickness. The first inner dimension surrounds the outer dimension of the optical element. The first outer dimension is within the image intensifier assembly. The first circuit board further includes a component surface. The component surface extends from the first inner dimension to the first outer dimension. The first circuit board has power supply components mounted on the component surface.

The application discloses a device and method for testing the light feedback characteristic of a low-light image intensifier image tube, which comprises a light source, a neutral filter box, an adjustable aperture diaphragm, an integrating sphere, an illuminometer, a contrast test target plate, a conjugate projection lens assembly, an image tube, an industrial camera, an image tube high-voltage power supply, a computer and a test dark box. The method tests the linearity of a certain fixed spatial frequency line under the corresponding MCP voltage of the image tube, and obtains the MCP voltage of the image tube at which the light feedback occurs according to the change of the contrast of the image tube with the MCP voltage. If the brightness gain corresponding to the voltage is higher than the required brightness gain, the image tube does not have the risk of light feedback, otherwise, the image tube has the risk of light feedback. Whether the image tube and the high-voltage power supply packaged as an image intensifier have the risk of light feedback is determined. The application realizes the accurate test of the light feedback characteristic of the low-light image tube, can avoid the circulation of the image tube with the risk of light feedback, and guarantees the imaging quality of the low-light image intensifier.

The application provides a detection system and method for early extremely weak flame imaging positioning, which comprises a horizontal light path branch, a vertical light path branch and a video circuit processing board; the horizontal light path branch is coaxially connected with a first focusing lens, a light splitting prism, an ultraviolet filter, a second focusing lens, an image intensifier and a first image detector in sequence along a horizontal direction; the vertical light path branch is connected with a third focusing lens and a second image detector in sequence along a direction perpendicular to the horizontal light path and a light splitting surface of the light splitting prism; the video circuit processing board is provided with a video circuit processing board, which is electrically connected with the first image detector and the second image detector respectively to receive image electric signals output by the two detectors. The system can image and detect early extremely weak flames at a very long distance, can amplify the spectrum of the flame alone at a high magnification, and cannot amplify the spectrum of other background objects, so that the characteristics of the flame are highlighted.

The utility model discloses a dual-channel low-light night vision device, which comprises a lens body group, a low-light lens group arranged at the front end of the lens body group, an eyepiece group arranged at the rear end of the lens body group, and a white-light lens group, the mirror body set comprises a mirror body shell, an image intensifier installed in the mirror body shell, a controller installed on the mirror body shell, a battery, an infrared light supplementing lamp, a photosensitive lamp and a switch. The controller is electrically connected with the image intensifier, the battery, the infrared light supplement lamp, the photosensitive lamp and the switch. The white-light lens group is mounted at the front end of the lens body group, and the optical axis of the white-light lens group is parallel to the optical axis of the low-light lens group; an image combination prism group used for overlapping the optical axis of the white light lens group and the optical axis of the low-light lens group is mounted in the lens body shell; the image combination prism group comprises an upper beam splitter prism and a lower beam splitter prism which are used for changing the optical axis of the low-light-level mirror group. The LED lamp has the advantage of being capable of being used in both low-illumination and strong-light environments.

The application discloses a kind of molecular marker velocity measurement methods for steady flow field under high-speed wind tunnel, belong to wind tunnel test technical field.To solve the problem of improving the robustness and precision of MTV data processing.The present application includes based on femtosecond laser system in the upper part of test section to the directly below incidence wavelength femtosecond pulse laser generates fluorescent bright line, after flow field stabilizes, trigger image intensifier, using camera to collect test image;Collect the fluorescent bright line reference image under the condition of no wind, as calibration image, place steel plate ruler in the fluorescent bright line plane, calculate space and pixel conversion coefficient;Image correction is carried out to test image, and the test image after rotation correction is obtained using fast fourier transform method, calculate pixel displacement;Using space and pixel conversion coefficient and pixel displacement, conversion is carried out to obtain actual velocity in space.The present application can significantly reduce the quality requirement of test image.