52results about How to "Stable pulse width" patented technology

The invention provides a laser device and a laser radar. The laser device comprises a pump unit, a gain unit, a Q-switching unit, and a beam splitting unit disposed in sequence along an optical axis.The pump unit generates pump light. The gain unit includes a gain medium. The Q-switching unit includes a saturable absorber. The beam splitting unit generates exiting laser and a plurality of tuninglight of different wavelengths. The laser device also comprises a resonant reflecting surface and a scanning unit, the resonant reflecting surface is located between the gain unit and the pump unit, and the scanning unit selects one piece of tuning light from the plurality of tuning light and returns the selected tuning light according to an original optical path. The laser device is a tunable laser device capable of realizing Q-switching, higher peak power and larger pulse energy can be obtained, the cavity length of a resonant cavity and the volume of the resonant cavity can be effectively reduced, and the realization of the consideration of both high integration and high peak power is facilitated.

The invention provides an energy collection system and a self-energy-supply wearable device. The energy collection system comprises n independent unit structures, wherein n is a positive integer; eachindependent unit structure includes a generation system and a rectification system, the generation system comprises a micro generator used for converting mechanical energy generated by movement of ahuman body to electric energy, the rectification system comprises a rectification circuit, an AC input terminal of the rectification circuit is connected with an output terminal of the micro generator, and the rectification circuit is used for converting the form of the electric energy of the micro generator to DC pulse from AC pulse, wherein output circuits of the n independent unit structures are provided with voltage reduction devices; and each voltage reduction device is a spark gap or a discharging tube to mutually isolate the generation system and the rectification system and control theoutput voltage and current of the output circuits. The output voltage can be reduced, the output current can be increased, the pulse width of the output current is effectively improved, the effect ofpulse width modulation is achieved, the stability of the output voltage is guaranteed, and the system and the device are more applicable to device power supply or energy collection.

The invention discloses a multi-modulus divider and the basic frequency division units of the multi-modulus divider. The multi-modulus divider is cascaded by a plurality of basic frequency division units. The basic frequency division units are used for reducing the frequency of the frequency division input signal according to the mode input signal and the control bit signal. The basic frequency division unit comprises four latches, and the basic frequency division unit also comprises a pulse width regulating circuit which is used for increasing the pulse width of the mode input signal. The basic frequency division units of the multi-modulus divider disclosed by the invention can broaden the pulse width of the mode input signal, and the basic frequency division units can output the correct frequency division output signal in the three frequency division mode while the pulse width of the mode input signal received by the basic frequency division units is not enough, therefore, the multi-modulus divider which is cascaded by the basic frequency division units can perform frequency division on the frequency division iutput signal with a higher frequency, so a wider locking bandwidth is realized.

The invention discloses an electronic current transformer and a high-voltage side on-line energy-receiving device of the electronic current transformer. The electronic current transformer and the on-line energy-receiving device of the high-voltage side of the electronic current transformer comprises a high-voltage side electricity-using unit and a high-voltage side energy-receiving device for supplying electricity to the high-voltage side energy-receiving device. The high-voltage side on-line energy-receiving device comprises a shielding shell, wherein an iron core and a secondary winding are internally arranged in the shielding shell, the secondary winding is winded on the iron core, a leading-out terminal of the secondary winding is connected on a connecting terminal externally arranged on the shielding shell, an annular laminated core is adopted as the iron core, a group of magnetic valves is arranged on the periphery of the iron core, and a narrow groove is arranged on the magnetic valves and extends along the radial direction, and penetrates through the front end surface and the rear end surface of the iron core along the radial direction. Because the group of magnetic valves is arranged on the iron core, not only the problem that when the current of a bus is large, a traditional current transformer can not stably obtain energy with large power because of saturation is solved, but also upper limit of a current dead zone can be increased to more than 20000A.

A laser pulse width compression system with preset space chirp comprises: a space chirp generator; and a first optical telescopic beam expander, a near-field light spot corrector, a second optical telescopic beam expander, a first laser energy amplifier,..., an Nth optical telescopic beam expander, an Mth laser energy amplifier,..., a tail end optical telescopic beam expander and a space chirp type grating compressor which are sequentially arranged in the direction of space chirp laser generated by the space chirp generator. The space chirp generator is used for enabling different spectral components of the laser pulse to be distributed at different positions of the cross section of the light beam to form a specific spatial chirp proportion. The superficial area of the grating can be fullyutilized, the energy load of the grating compressor is remarkably increased, the light beam energy loss of the grating compressor caused by the limited grating size is reduced, and then the upper limit of the output peak power of the laser chirped pulse amplifying device is improved.

The invention discloses an uninterruptible power supply (UPS) medium-and-high voltage lithium battery management system, comprising a battery, a controller, a rectifier, a battery converter and a circuit system. The circuit system comprises positive and negative bus DC capacitors C6 and C7, a battery inductor L7, a switch tube Q3 and a diode Q4, wherein when the steady-state potential of a junction of the battery inductor L7 and the switch tube Q3 is higher than the battery voltage Ub, the circuit system is a charging circuit; when the steady-state potential of the junction of the battery inductor L7 and the switch tube Q3 is lower than the battery voltage Ub, the circuit system is a discharging circuit. The UPS medium-and-high voltage lithium battery management system realizes the switching of the charging and discharging of the battery by detecting the steady-state potential in the circuit, during charging, automatically switches between a current-limiting equalized charging process,a constant-voltage equalized charging process (including the freewheel equalized charging), and a floating charging process so as to equalize and supplement the individual battery capacity, controlsthe charging current, avoids damage to the battery caused by excessively high charging current, and avoids excessively long charging time caused by excessively low charging current.

The invention discloses a composite rubber film used for complex shape surface multi-pas laser shock reinforcement. The composite rubber film used for complex shape surface multi-pas laser shock reinforcement is composed of an energy absorbing layer and an energy restraint layer through connection; the energy absorbing layer and the energy restraint layer are arranged on a target material successively; the energy absorbing layer rubber film comprises two material layers, and is composed through connection of a black insulated rubber tape and a black double faced adhesive tape; the energy restraint layer is a transparent restraint layer, and is formed through blending of epoxy resin and a curing agent, and curing after adhesion onto the black double faced adhesive tape at half-cured state.A plurality of times of blast of a same point on the energy absorbing layer in a plurality of times of laser shock reinforcement is caused, and over gasification is avoided; a same point of the energyrestraint layer is capable of bearing a plurality of times of black without cracking; the composite rubber film is capable of bearing multi-pas laser shock reinforcement, reinforcement effect is improved, and laser shock reinforcement pre-treatment and post-treatment are simplified.

The invention relates to an energy compensation method used for laser engraving. The method comprises the steps of supplying a laser with a Q switch, calculating out the needed energy value of the scan central point and the needed energy value of the point farthermost from the central point when conducting laser engraving; establishing the function of displacement and needed energy between the displacement from the central point and the needed energy value; establishing function between the displacement from the scan central point and the establishment time according to the establishment time of the reproduced pulse of the laser and the needed energy, and conducting energy compensation to scan points in different positions through the Q adjustment by the Q switch according to the function between the displacement from the scan central point and the establishment time, changing the Q adjustment pulse width frequency and the pulse width through adjusting Q by the Q switch and increasing energy compensation, so as to conveniently and effectively carry out compensation to the energy loss of different scan points, thereby ensuring that the burst and lighting degree of the entire scan range reaches a uniform level and relative uniform engraving effect can be achieved in the entire scan range.

The invention belongs to the technical field of manned space flight aircraft and particularly relates to a landing buffering device. A multilayered airbag landing buffering seat is characterized by comprising a plurality of layers of airbags (1, 2) which are overlapped up and down; all the airbags (1, 2) are internally provided with stretching cloth (5) which keeps a shape after being inflated; a communication hole (6) is formed in the stretching cloth (5); all the airbags (1, 2) are provided with a plurality of exhausting holes (3) opened by blasting membranes; the total cross area of the exhausting holes (3) of all the airbags (1, 2) are not equal. Before a buffering process is started, all the airbags are fully filled with gas, and a passenger sits on the airbags and is fixed by a binding belt; in the buffering process, the blasting membranes of all the airbags (1, 2) are opened when pre-set pressure is achieved and the pressure is leaked at different speeds, so that the pulse width of an impact load is extended in a large scale, and the peak value of the impact load is weakened. The plurality of layers of airbags are arranged so that the landing buffering seat does not completely lose efficiency when any one airbag is damaged, and the reliability is improved.

The invention provides a chirped pulse compression device and a laser. The chirped pulse compression device comprises the following components: a translation roof prism and a grating which are spaced oppositely, wherein all angles are arranged in a total reflection manner; and a reflector assembly which comprises a plurality of reflectors which are all located between the grating and the translation roof prism; wherein after incident light is emitted to the grating, the incident light is diffracted by the grating to form first light which is emitted to the reflector assembly along a first direction, and the first light is reflected back to the reflector assembly after being reflected by the reflector assembly for multiple times and translated by the reference surface position of the translational roof prism, and then is reflected for many times; and the light returns and enters the grating along the direction symmetrical with the first direction relative to the normal direction, and then is subjected to secondary diffraction by the grating to form a second light meeting the grating diffraction condition. The chirped pulse compression device provided by the invention can improve the utilization rate of the grating region and increase the compressible pulse width so as to improve the pulse output single pulse energy and reduce the cost.

The invention belongs to the technical field of manned space flight aircrafts, and relates to a landing buffer device, in particular to a landing buffer seat with multiple layers of internal and external air bags. The landing buffer seat comprises the multiple layers of air bags which are arranged layer by layer from inside to outside in a wrapping mode. Pull cloth (5 and 7) is arranged in each air bag and can keep the shape of the air bag after the air bag is inflated, communication holes (6) are formed in the pull cloth (5 and 7), multiple exhaust holes opened by blasting membranes are formed in the wall of each air bag, the total cross sectional area of the exhaust holes (3) of the outer-layer air bag (2) is smaller than that of the exhaust holes of the inner-layer air bag (1) layer by layer, and the opening pressure of the blasting membranes of the outer-layer air bag (2) is smaller than that of the blasting membranes of the inner-layer air bag (1) layer by layer. By means of the landing buffer seat, the pulse width of impulse loads can be greatly expanded, and the peak value of the impulse loads can be greatly decreased. Because the multiple layers of air bags are arranged, damage to any air bag will not lead to the complete failure of the landing buffer seat, and accordingly the reliability of the landing buffer seat is improved.

The invention relates to a method for operating an electric motor with a primary section and a secondary section, wherein the primary section has a multi-phase exciter winding comprising winding strands, each of the phase connections of said exciter winding being connected to an output connection of an end stage, wherein the end stage has controllable semiconductor switches for applying phase voltages to the phase connections, said method comprising the following steps: a) introducing an operating phase by applying the phase voltages to the output connections of the end stage such that a moving magnetic field is induced in the exciter winding, said moving field effecting a relative motion between the primary section and the secondary section, b) turning off the phase voltage at at least one of the output connections in order to introduce a measurement phase, c) measuring the electrical back emf induced in the winding strand connected to said at least one of the output connections by virtue of the relative motion between the primary section and the secondary section in order to determine the angular difference between the phase position of the exciter current and that of the back emf, and d) optionally, repeating steps a) through c). After turning off the phase voltage, the winding current in the winding strand for which the phase voltage was turned off is conducted and maintained by way of at least one free-wheeling element having a non-linear characteristic curve. A flank (13) in the winding voltage, the flank occurring upon zero-crossing of the winding current flowing in said winding strand, is detected and is used as a triggering signal for the measurement of the back emf of the respective winding strand.

The present invention relates to a low-cost miniature narrow pulse generating method, and an employed circuit comprises an excitation source for generating a PWM excitation signal, a delay line moduleand an exclusive OR gate comparator. The method is characterized in that according to the required pulse width of the narrow pulse, the delay parameter of the delay line module is determined, and thePWM excitation signal is used as the original signal; the delay signal of the delay line module and the original signal pass through the exclusive XOR gate comparator to obtain a narrow pulse signalwhich is finally outputted. The method has the advantages of low cost and good stability.

The invention discloses an electric pulse type intelligent fascia gun, and the fascia gun comprises a fascia gun body; a massage piece is installed at the end of the fascia gun body; the massage piece is provided with an electric pulse massage plate and an electric heating massage plate; the electric pulse massage plate is provided with an electrode matrix, and the electric heating massage plate is provided with a heating matrix, the electric heating massage plate is arranged in the massage piece, heat emitted by the electric heating massage plate is transmitted to a human body through the electric pulse massage plate, when the fascia gun is used, the massage piece is tightly attached to the skin of an affected part, the electrode matrix emits pulse electrical stimulation, muscle tension is relieved, and local tissue tension is reduced; the heating matrix emits heat, blood circulation is promoted through skin, and exercise fatigue is relieved.

The invention relates to a high-power, high-repetition-frequency and pulse-width-adjustable ultrafast laser system. Laser pulses with the repetition frequency of GHz or above are generated through a laser seed source. A broadening and amplifying module is used for amplifying and broadening the laser pulse. A pulse modulation module modulates the amplified and broadened laser pulses to generate a plurality of laser pulse strings with different frequencies and different duty ratios, and the laser pulse strings are amplified step by step by adopting a multi-stage amplification module. A nonlinearcompression amplification module adjusts the spectrum broadening by controlling the pumping power or the nonlinear quantity; and the broadening degree of the laser pulse and the frequency and duty ratio of the pulse modulation module are continuously adjusted by combining the broadening amplification module, so that different nonlinear compression pulse widths can be obtained, and the pulse widthcan be continuously adjusted from picosecond to femtosecond. The pulse compression module compresses and outputs the laser pulse with continuously adjustable pulse width, so that the laser pulse withhigh power, high repetition frequency and adjustable pulse width is output.

A compact high-voltage pulse generator based on a spiral pulse generator is provided, wherein the spiral pulse generator is in the form of an LTTC component part or HTCC component part including two ceramic films of a given width and a metallic conductor applied to each of said ceramic films, which conductors are wound together in spiral form, such that the edge of the films together forms an end face in the manner of a circular ring, the two conductors being electrically insulated from one another by at least one insulation means.

The invention discloses a flexible constraint layer for laser shock reinforcement online repair and a manufacturing method of the flexible constraint layer. The flexible constraint layer is prepared from bisphenol-A type epoxy resin and an amine curing agent according to a mass ratio of (1.5 to 3) to 1. The invention also discloses a manufacturing method of the flexible constraint layer for lasershock reinforcement online repair. The flexible constraint layer disclosed by the invention can be applied to a planar region, and also can be applied to a complicated curve-surface region; the manufactured constraint layer can effectively enhance the laser shock effect, and the process is stable and low in cost; and the maintenance efficiency of a machine can be effectively improved.

The invention discloses an energy-saving control system with voltage detecting and voltage stabilizing functions and used for a corridor illumination lamp. The energy-saving control system mainly consists of a diode rectifier U, a NOT-gate IC1, an integrated voltage-stabilizing circuit, a NOT-gate IC2, a NOT-gate IC5, a field effect transistor MOS, a triode VT1, a triode VT2, a triode VT3, a triode VT4, a relay K, a magnetic sensitive sensor CM, a light emitting diode VL and the like. By suppressing or eliminating a surge current in an input voltage, the output voltage can be higher in stability; in addition, by virtue of combination of the magnetic sensitive sensor CM and a photosensitive switch BuIb of a hall element, starting and closing of the illumination lamp in a corridor can be well controlled, thereby improving starting and closing control effect on the illumination lamp in the corridor.

The invention discloses a control system for an ozone UV lamp. The control system is mainly composed of a transformer T, an integrated voltage regulator circuit, a diode rectifier U, a triode VT1, a triode VT2, a triode VT3, a triode VT4, a unidirectional thyristor VS, an adjustable resistor R5, a diode D2 and the like, wherein the P pole of the diode D2 is connected with the collector of the triode VT3, and the N pole of the diode D2 and the negative pole of a polar capacitor C4 together form the output end of a thyristor overvoltage regulator circuit. By means of the control system, input instantaneous high voltage can be suppressed and can also be regulated, the stability of output voltage and current is ensured, the ozone UV lamp of a UV lamp air deodorization purifier is not influenced by input high voltage or current, and therefore the overvoltage regulation effect of the control system is improved, and the protection effect on the ozone UV lamp can be effectively improved.

The invention discloses a tunable ultraviolet light generation apparatus based on a self-similarity amplifier. The tunable ultraviolet light generation apparatus is characterized by comprising an ultra-short pulse optical fiber laser, a cascading high-power amplifier and a quadruplicated frequency system connected in sequences, wherein the cascading high-power amplifier comprises a first-level amplifier, a second-level amplifier, a pre-chirping management module, a third-level amplifier and a chirping compensation module. The tunable ultraviolet light generation apparatus has the advantages that the near infrared light obtained by a pre-chirping management technology and a self-similarity amplifying system is quite narrow in pulse width and high in power, so that frequency multiplication efficiency is high, and high-power ultraviolet laser can be obtained; and in addition, the infrared laser generated based on self-similarity amplification has the broadband spectrum characteristic, and tunable high-power laser output within an ultraviolet band range can be realized.

High pressure discharge lamp (20) with improved ignitability. A spiral pulse generator (1) that is directly mounted inside the outer piston (12) of the lamp is used for igniting the high pressure discharge lamp.

The invention provides a picosecond seed source excitation device, which is characterized in that a resonant cavity is formed by two end surfaces of an Nd:YAG&Cr<4+>:YAG bonding crystal, the Nd:YAG&Cr<4+>:YAG bonding crystal (4) is used as a passive Q-switching crystal, the Q value of the resonant cavity is adjusted by using the saturable absorption characteristic of the Nd:YAG&Cr<4+>:YAG bonding crystal (4) so as to achieve the Q-switching purpose, a collimating mirror (2) and a focusing mirror (3) perform beam shaping on incident pump light so as to make the pump light enter the Nd:YAG&Cr<4+>:YAG bonding crystal (4) at a specific angle and position to form a focus point in the crystal, then the divergence angle of the light beam is shaped and compressed through a concave beam expander lens (6) and a convex beam expander lens (8), and the light beam can pass through an isolator (7) in one direction, so that the influence of the return light on the crystal and the optical fiber and irreversible optical damage are avoided, and the characteristics of high energy, narrow pulse width, high light beam quality, high stability and the like are achieved so as to improve the energy conversion efficiency, reduce the device loss and prolong the service life.

The invention provides an IGBT (Insulated Gate Bipolar Transistor) driving circuit, relates to the IGBT driving technology and aims at solving the problems that the pulse width of driving signals is narrow on the premise of meeting the consistency of the driving signals of the existing IGBT driving circuits connected in series. According to the IGBT driving circuit, the consistency of the driving signals can be guaranteed by utilizing the characteristic that the voltage-second product of a ferrite bead is a constant, when the positive pulse of the driving signals is over, a capacitor C provides the follow current for the IGBT driving signals, voltage is slowly declined, the pulse width of the driving signals is increased by 100 times, and the pulse width of the IGBT driving circuit gets rids of the limit on the voltage-second product of the ferrite bead. The IGBT driving circuit is used for driving a large-pulse-width power supply.