33 results about "Digital delay generator" patented technology

A series of holograms is recorded by synchronizing a camera with laser pulses under the control of a digital delay generator. Amplitude and phase images are calculated while image distances are adjusted for the best focus on the object under observation. The amplitude and phase images are reconstructed while adjusting the image distances over a predetermined range to maintain the object in focus. Numerical superposition of a plurality of holographic fields taken with varying wavelengths provides high resolution microscopic three-dimensional imaging. Numerical reconstruction is based on an angular spectrum method that enables calculation of the image at any distance from the hologram plane. Wavelength scanning digital interference holography also enables image reconstruction along an arbitrarily tilted plane.

The invention belongs to the technical field of laser probing, in particular to a laser probe micro-area component analyzer based on a double laser light source. The laser probe micro-area component analyzer comprises a fixed wavelength laser device, an attenuator, a beam expanding mirror and an aperture diaphragm; first semi-permeable half-mirrors are arranged on the same horizontal light path according to the structure; after a wavelength tunable laser device is reflected onto the first semi-permeable half-mirrors by a second totally reflecting mirror, the wavelength tunable laser device has the same light path with the laser beam of the fixed wavelength laser device; the fixed wavelength laser device and the wavelength tunable laser device can be arranged up and down or in parallel, and the starting sequence and the time delay thereof can be controlled by a digital delay generator; a fibre-optical probe receives laser, then the laser is transmitted to a grating spectrometer by the optical fibre, and the acquisition time of a plasma spectra reaching enhancement mode CCD is controlled by the digital delay generator. The laser probe machine stimulated by the double laser light sources has low detection limit, high element analysis precision and favourable element selectivity, is reliable and safe, and can be used for accurately determining the nature of microelements and trace elements of the micro-areas of various substances as well as carrying out accurate quantitative analysis.

An optical system includes an optical interferometer that generates interference phenomena between optical waves to measure multiple distances, thicknesses, and indices of refraction of a sample. An excitation-emission device allows an electromagnetic excitation and emission to pass through an objective in optical communication with the sample. An electromagnetic detector receives the output of the optical interferometer and the excitation-emission device to render a magnified image of the sample. A digital delay generator synchronizes the optical interferometer and excitation-emission device to operate in substantially unison to generate a noninvasive depth of field of the portion of the sample that corrects a plurality of optical aberrations in real-time.

The present invention relates to a cavity ring down aerosol extinction spectrometer, which comprises an optical path system, an electrical circuit system and a gas path system, wherein the optical path system comprises a light source, an optical cavity and a light adjustment system, the gas path system comprises a sample gas path, a protection gas path, an electromagnetic triple valve, an aerosol filter and a gas pump, the electromagnetic triple valve and the aerosol filter are arranged on the front portion of the optical cavity, the gas pump is arranged on the rear portion of the optical cavity, the electromagnetic triple valve, the aerosol filter and a relay form an automatic zero calibration device, the electrical circuit system comprises an optical path control part and a data acquisition part, the optical path control part comprises a digital delay generator, and the data acquisition part comprises a photomultiplier tube, a stabilized voltage power supply, a computer and a high-speed data acquisition card. The cavity ring down aerosol extinction spectrometer has the following advantages that: accuracy is high and can achieve 10<-1> Mm<-1>, time resolution is high and can achieve 20 s, and in situ measurement is performed on the sample so as to provide less influence on the sample.

The invention discloses a device and a method for measuring flame form and temperature synchronously. According to the method, the transient flame form is detected with high-speed schlieren, and the flame temperature is detected with TDLAS (tunable diode laser absorption spectroscopy); detection zones of the high-speed schlieren and the TDLAS are focused in the same detection zone in a constant-volume combustion bomb respectively, the high-speed schlieren and the TDLAS are controlled synchronously by a digital delay generator, and synchronous detection for the flame form and temperature in thetransient flame propagation process is realized. The device comprises the visual constant-volume combustion bomb, a light source, a pinhole diaphragm, an achromatic Fourier transform lens, an adjustable diaphragm, a high-speed camera, a laser, a laser driver, a function generator, an etalon, a reflector, a photoelectric detector, a data acquisition unit and the like. According to the device and the method, the problem about synchronous measurement for the transient flame form and temperature is solved, the clear flame form is obtained with the high-speed schlieren, the high-temporal-resolution flame temperature is obtained with the TDLAS, and combustion characteristics of transient flame are researched through combination of two results of the flame form and temperature.

The invention discloses a generation method and device of a Z-pinch shell plasma column. The device comprises a vacuum plasma target chamber, a pulse current generator, an annular laser spot generation device and a digit delay generator, wherein a load high-voltage electrode and a load ground electrode matched with the load high-voltage electrode are installed inside the vacuum plasma target chamber; a hole is formed in the load ground electrode; a transparent window is formed in the wall of the vacuum plasma target chamber; the load high-voltage electrode, the hole in the load ground electrode and the transparent window are coaxially arranged; the pulse current generator and the input end of the annular laser spot generation device are connected with the digit delay generator; the output end of the pulse current generator is connected with the load high-voltage electrode; a light outlet of the annular laser spot generation device and the transparent window are coaxially arranged. The method and device avoid an uneven structure and the like of a guide plasma caused in the process of forming the shell plasma column through cold and solid materials, and at the same time, the load structure is simpler, installation is convenient, and parameters are adjusted conveniently.

The invention discloses a high-speed train energy-saving resistance reducing method and device. Air flow is induced to change on a headstock windward side so as to change the layering condition of an air flow boundary layer, and the headstock wind resistance is reduced. By changing input voltage, the speed and size of induced air flow generated by a plasma generation device are controlled, the plasma generation device is adjusted at the same time, the geometric structure and position of an electrode of the plasma generation device are changed, the speed and direction of the generated induced air flow are adjusted, and induced air flow needed for achieving the optimal resistance reduction of a high-speed train can be obtained; and the two ends of the plasma generation device are connected with an electrical parameter measurement device, a power amplifier switch thyristor is triggered by a digital delay generator, and a pressure monitoring system is connected with a PC terminal. The high-speed train energy-saving resistance reducing method and device can effectively reduce pneumatic resistance borne in the driving process of the high-speed train and achieve the purposes of saving energy and improving operation safety.

The invention relates to a system and method for measuring instantaneous gas density for conversion from long-air-gap streamer discharge to leader discharge. The system includes an LED chip, a bean expanding lens, a main lens, a convergent lens, a knife edge, a telephoto lens and an ICCD camera. A discharge zone is generated between the main lens and the convergent lens. A coupling lens focuses self-luminescence generated by discharging and transmits the self-luminescence into a photomultiplier. The photomultiplier converts optical intensity time domain signals of the discharge self-luminescence into a voltage waveform and inputs the voltage waveform into a TTL pulse formation circuit. An output end of the TTL pulse formation circuit is connected to an input end of a digital delay generator, and the output end of the digital delay generator is connected to a pulse drive power supply and the ICCD camera separately. The system and the method can achieve accurate inversion measurement ofan ns-stage instantaneous gas density distribution rule in a process of conversion from long-air-gap streamer discharge to leader discharge, and have advantages of high system reliability and a high capturing efficiency.

The invention discloses a pantograph-overhead-contact-line-system arc plasma multi-parameter acquisition method and apparatus. The apparatus comprises an arc spectrum acquisition device, an electrical parameter measuring device, a physical parameter measuring device and a digital delay generator. A pantograph sliding plate and an overhead contact line system wire are connected with the electrical parameter measuring device and the physical parameter measuring device. A data acquisition card, a linear displacement sensor and the arc spectrum acquisition device are triggered by the digital delay generator. The apparatus is simple and free of interference, and can accurately measure the internal parameters of the plasma, and completely reflects the ablation state of the pantograph-overhead-contact-line-system arc plasma by synchronously acquiring multiple arc parameters in real time such as pantograph-overhead-contact-line-system arc plasma emission spectrum, voltage and current, and clearance distance.

The invention discloses a system for measuring a hyper-velocity impact debris cloud three-dimensional structure. The system comprises a target chamber which is used for simulating the space environment; a target surface which is arranged on the target chamber, wherein the projectile collides with the target surface to generate the debris cloud; a velocity measuring instrument which is used for measuring the motion velocity of the projectile and calculating the motion time from the projectile to the target surface; a pulse laser which emits laser to the debris cloud; a beam expander which expands and collimates the emergent light of the pulse laser; a first lens module which realizes reduction of the beams passing through the debris cloud; a CCD camera which records the hologram of the debris cloud; a digital delay generator; a filter module which is installed in front of the CCD camera to weaken the laser and enhance the signal-to-noise ratio; an oscilloscope which records the time sequence of the velocity measuring instrument, the CCD camera exposure and the laser emergent voltage signal; and a computing module which acquires the debris cloud hologram recorded by the CCD camera and performs reconstruction by using the hologram reconstruction software so as to obtain the three-dimensional structure of the debris cloud and the size of the debris.

The invention relates to a high-perturbation-resistance laser seed source system based on single-polarization transmission fibers. The high-perturbation-resistance laser seed source system based on single-polarization transmission fibers comprises a narrow-line-width continuous fiber laser, a single-polarization acousto-optical chopper, a single-polarization fiber amplifier, a phase modulator, a single-polarization amplitude modulator, a clock frequency source, an arbitrary waveform generator and a digital delay generator, wherein the digital delay generator successively triggers the single-polarization acousto-optical chopper and the arbitrary waveform generator; and a phase modulating signal is generated by the clock frequency source, is loaded on the phase modulator, simultaneously is inputted to the arbitrary waveform generator and is used as a reference clock, so that phase locking is realized, and finally laser pulse with arbitrary pulse width is obtained. By the high-perturbation-resistance laser seed source system based on single-polarization transmission fibers, amplitude-frequency modulating caused by phase modulating spectrum broadening can be inhibited effectively, influences of the laser seed source system to laser pulse amplitude-frequency modulating and influences of external environments (including temperature and stress) are reduced, and quality of laser pulses output by a laser seed source is improved.

The invention discloses a system and a method for measuring spray micro-characteristics in a constant-volume combustion device. The system comprises the constant-volume combustion device, a fuel supply system, a digital delay generator and a phase Doppler particle analyzer, wherein the fuel supply system is provided with a controller; the constant-volume combustion device comprises a box and an incendiary bomb body, the incendiary bomb body is provided with four observation holes in through hole shapes, axes of the observation holes are located in the same horizontal plane, an angle between the axes of two observation holes is 180 degrees, an angle between the axes of the other two observation holes is 160 degrees, optical observation windows are mounted at the observation holes, and a connection hole communicated with the fuel supply system is arranged right in the upper part of the middle of the constant-volume combustion device; the controller is connected with the digital delay generator; an output end of the digital delay generator is connected with the phase Doppler particle analyzer. With adoption of the measurement method using the measurement system, the spray micro-characteristics can be measured in the constant-volume combustion device.

The invention discloses a method and a device for loading a high-speed flyer based on electrical explosion and laser coupling. The device comprises a high-voltage capacitor discharge unit, an MCT high-voltage switch driving module, a solid pulse laser, an optical element and a digital delay generator, wherein the high-voltage capacitor discharge unit comprises a high-voltage capacitor, an MCT high-voltage switch and an exploding foil chip based on a transparent glass substrate; the digital delay generator is used for sending pulse signals to the MCT high-voltage switch driving module and the solid pulse laser. When the metal bridge foil generates electrical explosion under the effect of capacitor discharge, laser beams are incident to an electrical explosion product, namely plasma through the transparent glass substrate, secondary energizing is conducted on the plasma, and electric explosion and laser coupling accelerated flyer are realized. Laser and electric explosion are combined, secondary energizing is carried out on a metal electric explosion product by using laser, the temperature and pressure of plasma are improved, secondary acceleration is realized, and a new means is provided for research of impact dynamics.

The present invention discloses a coin screening system based on a laser induced breakdown spectroscopy technology. The system is characterized in that: a loading tray is a horizontally arranged circular structure, and a plurality of coin grooves are arranged on the upper surface of the loading tray; a drop channel is arranged on one side of the loading tray, the lower end of the drop channel extends directly above one of the coin grooves, and the upper end of the drop channel extends obliquely upward and communicates with the output end of a cleaning device; a lens is arranged directly aboveanother coin groove, and a mirror is obliquely arranged directly above the lens; the output end of a first laser is horizontally arranged toward the mirror, and the first laser light emitted by the first laser is reflected by the mirror on the lens and then focused on a discarded coin; and a digital delay generator is horizontally arranged on one side of the first laser, and the digital delay is connected with the first laser. According to the system provided by the present invention, by integrating the coin cleaning and the coin detection and replacement, frequent replacement of discarded coins is avoided, and the efficiency and accuracy of the coin detection are improved.

The invention discloses a nanosecond pulse-driven dielectric barrier discharge arbitrary-moment surface charge observation system, which comprises a helium-neon laser source, a light path output end of the helium-neon laser source is sequentially provided with a light beam amplifier, a diaphragm and a polarization beam splitter, wherein a light beam of the laser source is divided into two paths through the polarization beam splitter, one path enters the dielectric barrier discharge unit through the 1/8 wave plate, and the other path enters the camera framing unit through the convex lens and the small hole. The camera framing unit is connected with three ICCD cameras so as to realize surface charge observation at any discharge moment; the three ICCD cameras are respectively connected with the digital oscilloscope, the nanosecond pulse power supply and the computer; the nanosecond pulse power supply is connected with a digital delay generator, the digital oscilloscope is connected with a high-voltage probe, and the digital oscilloscope is connected with the near end of the dielectric barrier discharge unit; the output end of the high-voltage probe and the output end of the nanosecond pulse power supply are connected with the far end of the dielectric barrier discharge unit. And the action mechanism of the surface charge on the nanosecond pulse DBD can be perfected.

The invention provides a measuring device for visualizing the propagation state and characteristics of high-speed deflagration waves, which comprises a streak window arranged on the side wall of a shock tube of a shock tube experimental platform, a pair of primary mirrors arranged on the two sides of the streak window, a high-frequency LED light source arranged on the upstream of a light path of the primary mirrors, a high-speed camera arranged on the downstream of the light path of the primary mirrors, and a digital delay generator connected with the high-frequency LED light source and the high-speed camera. The invention further provides a corresponding measuring method. The measuring device comprises a signal triggering system connected with the LED light source and the high-speed camera, so that the flash frequency of the light source is synchronous with the shooting frequency of the high-speed camera, and the whole process of detonation wave propagation can be captured. The device is simple in composition and good in operability, and the capturing difficulty of high-speed deflagration waves in the schlieren experiment is reduced.