178results about How to "Even energy distribution" patented technology

An electrosurgical system has an electrosurgical generator and a bipolar electrosurgical instrument, the generator being arranged to perform a treatment cycle in which radio frequency energy is delivered to the instrument as an amplitude-modulated radio frequency power signal in the form of a succession of pulses characterized by periods of a least 100 milliseconds between successive pulses and by a predetermined pulse mark-to-space ratio. Energy delivery between pulses is substantially zero and the mark-to-space ratio is typically 1:4 or less. Each burst is of sufficiently high power to form vapor bubbles within tissue being treated and the time between successive pulses is sufficiently long to permit condensation of the vapor. The treatment cycles may each include an initial period and a subsequent period, the pulse duty cycle being increased or energy being delivered continuously in the subsequent period in order that tissue coagulation can be achieved quickly despite increasing tissue impedance.

At edges of laser light on an irradiation surface or in the vicinity thereof, the energy density is attenuated gradually due to aberration of a lens or the like. Since such regions (attenuation regions) do not have enough energy density for annealing of an irradiation object, uniform annealing of the irradiation object is not possible.

In the present invention, one of the plural laser beams is divided into two laser beams so that each section of the two laser beams serves as an edge of the resultant laser light. Each attenuation region of the two laser beams is synthesized with an attenuation region of another laser beam. In this way, laser light every part of which has an energy density suitable for satisfactory annealing of an irradiation object can be obtained from plural laser beams having attenuation regions.

The invention discloses a melting path design method for high energy beam selective melting forming. The method comprises the following steps: 1, acquisition of layered section images of a to-be-machined workpiece: layered section images of multiple layers of the to-be-machined workpiece are acquired and stored, wherein the section of each layer is a to-be-machined area; 2, contour extraction: the contour of each layer of section image is extracted; 3, melting path filling: melting path filling is performed on the multiple to-be-machined areas respectively, melting path filling for any to-be-machined area comprises the following steps: surface layer scanning path filling, inner core scanning area determining and inner core scanning path filling. The method has simple steps and is reasonable in design, convenient to implement and good in use effect; a melting path for high energy beam selective melting forming can be designed simply, conveniently and rapidly, the designed melting path is reasonable, the workpiece machining precision is high, all parts of the workpiece are uniformly heated, and the workpiece has excellent mechanical properties.

The invention relates to an energy control method of an urban rail super capacitor storage system. The method comprises the following steps that: a direct-current power supply network voltage Udc and a super capacitor module group terminal voltage Usc are collected respectively and an output branch current Isc of the super capacitor module group is connected within each control period; a charging-discharging threshold calculation module outputs a charging threshold value Uchar and a discharging threshold value Udis in real time based on the super capacitor module group terminal voltage Usc within each control period; and according to a relation between the charging threshold value, the discharging threshold value, and the direct-current power supply network voltage Udc, a current control period of an urban rail super capacitor storage system is determined to be in a charging state, discharging state or a standby state. According to the energy control method provided by the invention, multiple sets of urban rail super capacitor storage systems can work in a coordinated mode and thus the urban rail super capacitor storage systems can absorb brake energy of the train fully and effectively, thereby improving the energy utilization efficiency of the urban rail power supply system. Moreover, fluctuation of the direct-current side voltage of the power supply system can be inhibited.

The invention discloses a method for realizing laser focusing, which utilizes reflection of a reflector and focusing of a focus lens to exchange an inner position and an outer position of a light spot of a laser beam in rings along the radial direction and to focalize. The method is characterized by comprising the following steps: the laser beam is reflected to a turbinate annular beam; the turbinate annular beam is converted into an annular beam; the annular beam is focused, so as to form an annular conical beam, and a hollow conical dark area is formed in the middle of the annular conical beam, thus obtaining a focusing spot of hollow annular light. The method solves the defects of laser focusing in the prior art and obtains a focusing spot with strong light encompassing weak light, almost uniform energy distribution and small gradient, thus improving the processing effect.

The invention discloses a wireless sensor network-based energy-efficient collaborative scheduling method, which is characterized by comprising the following steps of: (1) initializing a target; (2) estimating a state; (3) selecting a sampling interval; (4) dynamically forming a next cluster; and (5) dynamically updating a cluster head, i.e., judging whether a moving target moves out of a monitoring region of a wireless sensor network, stopping tracking if the moving target moves out of the monitoring region of the wireless sensor network, otherwise transferring state estimation information of the cluster head at the current moment to a cluster head of a next moment by the cluster head, changing the cluster head of the next moment into a working cluster head and turning to the step (2). According to the wireless sensor network-based energy-efficient collaborative scheduling method, various performance indexes are considered, the performance indexes are optimized on line to select the cluster head, the cluster is dynamically generated and the sampling interval is adaptively determined, and accurate tracking of a target is realized through collaborative sensing and information fusion of a sensor node in the cluster. The wireless sensor network-based energy-efficient collaborative scheduling method has the advantages that communication energy is saved, energy distribution and calculation resources in a network are balanced, the life cycle of the network is prolonged, the reliability of the network is improved and the like.

The invention discloses a beam combining, emitting and receiving method of lasers and a system, which belong to the technical field of photoelectricity and are used for carrying out beam combination, emission and reception on multi-beam multi-band high-power lasers. The beam combination, the emission and the reception of lasers in incidence in a plurality of directions are realized by adopting the reflection of a film at the side face of a prism, the incidence and the penetration of an end face, an optical fibre bar and a collimating mirror. The system contains a plurality of laser light sources, a multi-dimensional beam combiner, a shaper, a collimating mirror, a receiving and detecting unit and a computer system. The multi-dimensional beam combiner contains a multi-face prism and a prism holder, wherein the multi-face prism is provided with an end face and a plurality of reflecting mirror faces. A plurality of lasers are irradiated on the end face and the reflecting mirror faces of the multi-dimensional beam combiner from the periphery, the lasers of which the beams are combined are gathered on the input end face of the shaper at an aperture angle smaller than the numerical value of optical fibers, the output lasers are collimated into quasi-parallel light by the collimating mirror for irradiating a target, and the diffuse reflection lasers and the laser-induced radiation patterns of the target are received by the receiving and detecting unit positioned at the position of the focal point of the collimating mirror so as to realize the detection of the target and the acquisition of images.

The invention relates to the technical field of optical fiber sensors, in particular to an optical fiber temperature sensor which comprises a broadband light source, a first single-mode fiber, a second single-mode fiber and a multi-core fiber. The broadband light source is connected with the second single-mode fiber sequentially through the first single-mode fiber and the multi-core fiber. The connections on the first single-mode fiber, the second single-mode fiber and the multi-core fiber are all of recess structures formed by arc discharge. The optical fiber temperature sensor is high in temperature sensitivity, low in stress-temperature cross sensitivity and widely applicable to high-precision temperature measurementunder stress interference.

A uniform light spot surface scanning device of a laser cleaning machine comprises a laser output module (10), a gauss-flat top system, a gradually-changing rotating polygonal mirror (50), a drive motor (60) and a collimation focusing lens (70). The gauss-flat top system redistributes the energy of a gaussian laser beam emitted by the laser output module (10) and compresses the diameter of the laser beam at the same time, so that a laser beam with uniform energy is formed; the laser beam irradiates the gradually-changing rotating polygonal mirror (50); the gradually-changing rotating polygonal mirror (50) is driven by the drive motor (60) to rotate so as to make the laser beam form a space angle scanning beam; the space angle scanning beam is refracted by the collimation focusing lens (70) and then forms surface light spots on an object (80) to be cleaned.

The invention relates to a method for performing emulsion breaking on an oil-water emulsion by an ultrasonic wave. In the method, one or more ultrasonic generators are arranged in a raw material storage tank or a settlement tank in the gravity settling direction, only one ultrasonic generator acts in the direction of the same vertical line. An emulsion breaking device for implementing the method comprises the raw material storage tank or the settlement tank, and one or more ultrasonic generators are arranged at the bottom or/and top of the raw material storage tank or the settlement tank. The ultrasonic generators are distributed reasonably according to structural size and ultrasonic radiation areas, so that the ultrasonic generators cover comprehensively, and are prevented from being overlapped. The ultrasonic generators are connected with ultrasonic distributors, and one ultrasonic generator is arranged in one ultrasonic distributor. The action direction of the ultrasonic wave is the vertical direction and is consistent with the gravity settling direction, so the driving force is added in the oil-water settling direction, and the oil-water settling speed is accelerated. The device is uniform in ultrasonic wave energy distribution, excellent in emulsion breaking effect, simple in operation, convenient to run and maintain and low in running cost.

The invention discloses a focusing strategy optimizing method for mirror fields of a tower type solar thermoelectric power system. The focusing strategy optimizing method comprises the following steps: (1) blocking heliostats fields and determining a plurality of focusing points on a heat absorber; (2) calculating an energy flow density matrix produced by focusing each mirror field block to each focusing point; (3) constructing an optimizing problem by taking the smallest standard deviation of the energy flow density of each grid of the heat absorber as a target and adopting a constraint condition that the power of the heat absorber is not smaller than a preset value; and (4) solving the optimizing problem by adopting a multi-variable-site adaptive genetic algorithm with the elitism strategy to obtain the optimal mirror field focusing strategy. The focusing strategy optimizing method for mirror fields of the tower type solar thermoelectric power system disclosed by the invention can be used for enabling the energy on the heating surface of the heat absorber to be uniformly distributed on the premise of ensuring as much as energy received by the heat absorber as possible, is beneficial to protecting the heat absorber, the improving the heat exchange efficiency and strengthening the system performance, so that reference is provided for the operation of the tower type solar heating and power plant.

The invention discloses a high-sensitivity fast on-line detection method of optical thin film and element surface laser-induced damage and relates to the field of optical thin film and element surface laser-induced damage and life detection. The method utilizes a He-Ne light scattering detection method as a main detection method and utilizes a microscopic CCD imaging detection method as an auxiliary detection method. Aiming at each one test sample point, the high-sensitivity fast on-line detection method comprises carrying out detection by the He-Ne light scattering detection method as an optical thin film and element surface laser-induced damage determination basis, if the He-Ne light scattering detection result shows the optical thin film and element surfaces produce laser-induced damage, suspending the He-Ne light scattering detection, recording radiation laser pulse number, determining the He-Ne light scattering detection result by the microscopic CCD imaging detection method, and testing the next test point by the same methods so that detection of laser-induced damage on the whole surface is finished. The high-sensitivity fast on-line detection method realizes effective combination of the He-Ne light scattering detection method and the microscopic CCD imaging detection method and greatly improves sensitivity and reliability of optical thin film and element surface laser-induced damage on-line detection.

The invention relates to a semiconductor laser side pump module comprising one or more side pump module units and a crystal bar, wherein each side pump module unit comprises a baseplate, a semiconductor laser module fixed on the baseplate, a fast axis collimator arranged at the front end of the semiconductor laser module and a beam expander arranged behind the fast axis collimator, and the crystal bar is arranged behind the beam expander; the semiconductor laser module comprises a bar; and the side pump module unit also comprises a homogenizing mirror arranged between the beam expander and the crystal bar. The side pump module can ensure that the beam homogeneity and the energy density of a pumping semiconductor laser satisfy the operating requirement by utilizing fewer high-power semiconductor laser arrays as the pumping source after beam expansion and homogenization.

The invention relates to an optical path design control system and a control method of a laser etching machine. The optical path design control system comprises a laser device, a beam expander, a uniform light system, a dynamic focusing system, an objective lens, a galvanometer scanning system, an industrial personal computer and a laser control D/A output card, wherein a laser beam output from the laser device is expanded by the beam expander and then transformed by the uniform optical system, so that the laser beam is distributed more uniformly, and the uniform light system is behind the beam expander in the optical path; the dynamic focusing system is behind the uniform light system in the optical path; the objective lens is behind the dynamic focusing system in the optical path; the galvanometer scanning system is behind the uniform light system, and the industrial personal computer is connected with the laser control D/A output card for controlling the laser control D/A output card; and the laser control D/A output card is connected with the laser device, the dynamic focusing system and the galvanometer scanning system correspondingly. The scanning width of the optical path design control system is large, the energy of the processing beam is uniform, so that the laser etching machine produces a higher yield, and the processing range is larger.

The invention discloses a vacuum freeze-drying tester, which comprises a freeze-drying device, a vacuum system, a refrigerating system and a control system, wherein the control system is respectively connected with the vacuum system, the refrigerating system and the freeze-drying device; the vacuum system and the refrigerating system are respectively connected with the freeze-drying device; the freeze-drying device comprises a vacuum freeze-drying device and a micro-wave freeze-drying device; the vacuum freeze-drying device is connected with the micro-wave freeze-drying device by a freeze-drying cut-off value; and the freeze-drying cut-off value is used for switching between vacuum freeze-drying and micro-wave freeze-drying to separately/simultaneously perform vacuum drying and micro-wavevacuum drying or separately/simultaneously perform vacuum freeze-drying and micro-wave freeze vacuum drying.

An organic light-emitting device (“OLED”) improving adhesion of a frit is disclosed. The organic light-emitting device includes a first substrate, an auxiliary metallic layer disposed on a surface of the first substrate, a second substrate, a frit formed in overlapping relationship with the auxiliary metallic layer and interposed between the first and the second substrates to adhere the first and the second substrates together and wherein the auxiliary metallic layer is overlapped by the frit on the first substrate and formed separately from a wiring.