597results about How to "Reduce the difficulty of adjustment" patented technology

The present invention discloses a pixel circuit of an organic illuminated display device and a method for driving the pixel circuit; the pixel circuit comprises a first driving transistor, a second driving transistor, a storage capacitor, a coupling capacitor, and an organic light emitting diode (LED); the organic LED is driven by the first driving transistor. The method comprises the following steps: a. pre-charging: pre-charge the first drive transistor with pre-charge voltage, and holds the pre-charge voltage by means of the storage capacitor; b. storing a threshold voltage: the storage capacitor discharges the pre-charge voltage via the second drive transistor to the threshold voltage; c. writing grayscale data voltage: charge grayscale data voltage for the first drive transistor via the coupling capacitor, wherein, the grayscale data voltage is superimposed on the threshold voltage, and held by the storage capacitor. The pixel circuit and the driving method for the pixel circuit provided in the present invention can effectively suppress drifting of TFT property of the OLED unit in the organic illuminated display device, and thereby prolong the service life of the device.

A disclosed H-shaped four-crawler-belt slipform paver comprises an H-shaped telescopic chassis and crawler-type elevating turning apparatuses; the H-shaped telescopic chassis comprises two hollow longitudinal main beams, two transverse main beams and four hollow telescopic beams; the two transverse main beams are fixedly disposed between the top ends of the two longitudinal main beams; each of two ends of each longitudinal main beam is flexibly connected with the telescopic beam in an insertion manner; each telescopic beam is inside provided with a telescopic-beam oil cylinder; the top end of a piston rod of the telescopic-beam oil cylinder is connected with the telescopic beam, and the cylinder body of the telescopic-beam oil cylinder is fixedly connected with the longitudinal main beam; and the outer end of each telescopic beam is provided with the crawler-type elevating turning apparatus. The H-shaped four-crawler-belt slipform paver has the advantages that the four telescopic beams can have individual telescopic adjustment or have optionally-combined telescopic adjustment, so that the steady of the chassis and the paving flatness are guaranteed, the telescopic resistance of the telescopic beams is small, the adjustment manners are flexible and various, the application scope is wide, and the chassis can be adjusted into optional inclined angle according to different construction cases.

The invention discloses an intraday rolling scheduling method of an electric power system including multiple types of new energy. The method comprises the following steps of (1) determining constrained conditions, optimization objects and corresponding algorithm options according to scheduling demands; (2) setting up an intraday rolling model based on robust scheduling; (3) adopting the static security correction service of an electric power system robust scheduling system with multiple time scales to achieve static security correction of a robust scheduling intraday plan; and (4) adopting the electric power system robust scheduling system with multiple time scales to issue the securely corrected rolling scheduling plan to an energy managing system in a file means or in an automatic way. The method has the following advantages that (1) the impact of the uncertainty of new energy on the power grid is reduced; (2) it is guaranteed that the system is capable of coping with the uncertainty of new energy and the scheduling scheme achieves relatively strong robustness; (3) the scheduling means has a wide application range; and (4) the method is cost effective and environment-friendly.

The invention relates to a hobbing cutter abrasion test and abrasion resistance research experimental platform and a measurement evaluation method, aiming at solving the problems that in the prior art, measurement results have hysteresis, lower in engineering guidance and large in measurement error. The hobbing cutter abrasion test and abrasion resistance research experimental platform is providedwith an abrasive box and a transmission device, wherein an output end of the transmission device is provided with a clamping element used for clamping a cutter ring of a hobbing cutter, and the cutter ring of the hobbing cutter is enabled to be positioned above the abrasive box; the clamping element comprises cutter shaft support seats arranged at the two sides, wherein the cutter shaft support seat arranged at one side is fixed at an output end of the transmission device, and the cutter shaft support seat arranged at the other side is fixed on the abrasive box; the outer ring of a cutter hubis matched with the cutter ring of the hobbing cutter, and the inner ring of the cutter hub is matched with the cutter shaft support seats; the transmission device is also provided with a sensor bracket; an eddy current sensor element is arranged on the sensor bracket and at the position corresponding to the outer side of the outer ring of the hobbing cutter. The hobbing cutter abrasion test andabrasion resistance research experimental platform and the measurement evaluation method have the advantages that measurement is carried out on the cutting basis of simulation of a working environment, and an abrasion test is effectively combined with evaluation; real-time detection is realized, the measurement accuracy is increased, and the equipment application size is wide.

Disclosed in the invention is an apparatus for calibration of a laser triangulation system. The apparatus comprises a rotating platform, a top pin and a calibration cylinder; the calibration cylinder is fixedly arranged above the rotating platform; and the top pin is compressed at the upper surface of the calibration cylinder. In addition, the invention also discloses a calibration method for using the calibration apparatus. The calibration cylinder with a slit and checkerboard calibration boards is used as a tool; and on the basis of six steps, a slit image, a calibration board image and a laser image are collected and calculated in real time and whether the system calibration meets the preset requirement is determined. And at last, an imaging plane of a camera is in parallel with a reference plane; and an intersecting line of the laser and the reference plane is intersected with and is perpendicular to an optical axis of a lens. The provided method is simple and effective and can be mastered by an operator easily. Moreover, the adjustment precision is high; accuracy of the laser triangulation system can be effectively ensured; and thus the method and the apparatus have the good application prospects in the non-contact three-dimensional high-precision measurement field.

The invention relates to a weighing module which comprises a base and a weighing sensor, wherein the connecting side of the weighing sensor is installed on the base by a fastener; the base is provided with more than two installation holes; both side faces of the weighing sensor are connected with the wall of a spacing groove; the bearing side of the weighing sensor is provided with blind holes in a vertical direction; a top board or / and a bottom board of a frame-shaped rack is provided with installation holes; a bearing piece with spacing holes at the bottom is screwed on the top board of the frame-shaped rack and is fixed with the top board by a fastening bolt; both end surfaces of a rocking column respectively come into contact with the bottom surfaces of the blind holes and the top surfaces of the spacing holes; protective space A is arranged between the upper end surface of the weighing sensor and the bottom surface of the bearing piece; two horizontal spacing bolts are respectively installed on two side boards and positioned on both sides of the weighing sensor; and protective space B is arranged between the end surfaces of the horizontal spacing bolts and both side faces of the weighing sensor. The weighing module has the characteristics of high weighing precision, safety, reliability, convenient installation and maintenance, stable operation, low manufacturing cost and wide application range.

The invention provides an optical-fiber type laser wavemeter that consists of a lens, fusing quartz optical fiber, an optical fiber coupler, a wavelength calibrating device, a grating monochromator, a wavelength precise measurement device, a linear CCD (Charge Coupled Device), a signal processor and a data wire. In the invention, the fusing quartz optical fiber is used for guiding light and the optical fiber coupler is used for splitting beam so that the spatial dimension and complexity of the wavemeter can be effectively reduced; and the calibration, coarse measurement and precise measurement of the wavelength are effectively combined so as to realize high-precision real-time measurement on the central wavelength and spectrum bandwidth of the laser. In the invention, the linear width and the central wavelength of the continuous laser and the pulse laser can be measured precisely and conveniently at high speed, and the optical-fiber type laser wavemeter is particularly used for measuring the laser wavelength of an excimer laser.

The invention relates to the field of curtain walls of buildings, in particular to a frame type unit curtain wall adopting an auxiliary installing rack, a tooth profile angle and a tooth profile support. The frame type unit curtain wall adopting the auxiliary installing rack comprises a panel (1), end columns (2), middle columns (3), end cross beams (4), middle cross beams (5), inserting cores (6), an auxiliary frame (9), a cover plate and the like. The frame type unit curtain wall adopting the auxiliary installing rack, the tooth profile angle and the tooth profile support are long in service life, low in cost, good in machinability, short in field construction period and good in sealing performance.

The invention discloses a space beam combination device and system. The space beam combination device comprises a laser array, a collimator and a reflection mirror array, wherein the laser array comprises N lasers, the reflection mirror array comprises N reflection mirrors corresponding to the N lasers, and N is a positive integer more than 1; laser beams emitted by each laser in the laser array are incident on the corresponding reflection mirror; the collimator is used for collimating each laser beam; each reflection mirror in the reflection mirror array is used for reflecting the incident laser beams and then outputting a laser beam array; the laser beam array comprises N mutually parallel and coplanar laser beams; and the optical distances from a light source to the output position of the laser beams are the same. The scheme has the beneficial effects that the principle is simple, parts are reasonably allocated, the implementability is strong, the adjustment difficulty is low, the flexibility is high, the number of the lasers in the laser array is easily increased, and thus space beam combination requirements are met.

The present invention discloses a phased-array ultrasonic wave automatic detection system for detecting large-bore pipe circumferential weld. Said system mainly includes main control portion, specialpipeline creeper portion, ultrasonic wafer array probe portion, upperseat machine intelligent graphic processing portion, cable portion and special assembly car portion. The diameter range of pipe which can be detected by said system is large, from 4 inches to 56 inches.

The invention discloses a mechanical hand having the space full-covering working capability. A large vehicle and a small vehicle cooperate to achieve the function of adjusting the working position of a mechanical arm at will in plane space, meanwhile, an electric block is used for achieving ascending movement of the mechanical arm, and the mechanical arm is driven to do the ascending movement. Due to sliding connection between a telescopic cylinder and a rotation cylinder, descending movement of the mechanical arm is achieved through gravity of the mechanical arm, and therefore large-range space position adjustment of the mechanical arm in the full-space range is achieved. Meanwhile, accurate adjustment of the working position is achieved through multiple freedom degrees of the mechanical arm. The rotation cylinder can do rotation movement in the plane relative to a fixed cylinder, and therefore the adaptability of the mechanical arm to the complex environment is improved, and the station adjusting accuracy of the mechanical arm is improved.

The invention relates to the optical element parameter measurement, particularly relates to a fast and accurate method for testing eyeglass with ultra-high reflectivity. In order to solve the problem that the prior art of testing eyeglass with ultra-high reflectivity has low measurement precision and the debug takes time and labor. The invention includes the following steps: (1) constructing the optical cavity and the affiliated members; (2)coinciding the reference light source and the measuring light source in space; (3) adjusting the calibration moving plate; (4) accurately adjusting the optical path closure degree of the optical cavity; (5) fine adjusting the place of the matching lens, determining the fundamental transverse mode, and causing the laser light source fundamental transverse mode to match with the fundamental transverse mode of the tested optical cavity effectively; (6) fitting by the characteristic time I(t)=I0exp(-tcL / 2d) and obtaining the total loss L of the tested cavity. The invention introduces the visible light source as the reference light which greatly reduces the difficulty of adjusting of the cavity. The invention can measure and screen the optical lens with high quality in batch. The test precision of the method provided by the invention is higher than 5x10-7.

The invention provides an inverted pendulum non-linear controller design method, which belongs to the technical field of nonlinear control. According to the non-linear controller design method, a step controller design method is applied to the problem of inverted pendulum control, so that the whole performance of the controller is improved. The method is characterized by establishing a nonlinear model of an inverted pendulum system, designing a steady-state controller and designing a reference dynamic feedforward controller; designing a feedback controller: designing the feedback controller through a Lyapunov method for a closed-loop error system of an inverted pendulum; and finally, obtaining control laws of the whole system controller. The method not only solves the problem of limitation of a linear controller in a high-nonlinearity and complex-model multivariable system of the inverted pendulum, but also solves the problem that it is hard for intelligence algorithms of a cloud model and a neural network and the like to realize in the application process.

The invention discloses a rotary speed control system and method of a permanent magnet synchronous motor. A current sensor module is connected with the permanent magnet synchronous motor; the currentsensor module, a Clark coordinate conversion module and a Park coordinate conversion module are connected in sequence; the Park coordinate conversion module is connected with a nonlinear disturbance observator and a back-stepping controller separately; the nonlinear disturbance observator is connected with the back-stepping controller; the back-stepping controller, a Park coordinate inverse conversion module, a voltage space vector PWM module and an inverter are connected in sequence; the inverter is connected with the permanent magnet synchronous motor; and a rotary speed / position detection module is connected with the nonlinear disturbance observator, the back-stepping controller, the Park coordinate conversion module and the Park coordinate inverse conversion module separately. By adopting back-stepping control and the nonlinear disturbance observator method to replace the conventional PI controller, and by adopting a rotary speed-current single loop control mode to replace the conventional rotary speed loop and current loop cascading control structure, quick tracking control of rotary speed and current is realized.

The invention relates to an LED display screen alternative point collection correction method, comprising steps of virtually partitioning an area to be corrected into a plurality of alternative point unit cell, and determining the image screen correction mode which is that LED lamps of the same color in a plurality of LED pixels in each alternative point unit cell are controlled to be illuminated for each time. Aiming for the bottleneck problem of the alternative point collection correction mode, the invention provides an LED display screen alternative point multi-lamp collection correction method, which improves the photosensitive members of the image collection device, like the effective utilization rate of the camera CCD through increasing the LED pixel quantity on a single collection image, guarantees that the brightness collected by the single collection image while reducing the complexity of regulating the parameters by the collection device, reduces the difficulty of regulating the defocusing, enables the alternative point multi-lamp collection correction mode to be highly effectively applied into the correction of a greater resolution ratio LED display screen, and saves the substantial time spending on correction.

The invention relates to the field of an optical coherence tomography system of a polarizing frequency domain and in particular relates to an optical coherence tomography system of a polarizing frequency domain of a single spectrograph based on a photoswitch. A high speed photoswitch which is divided into two paths is placed in a reference arm light path, time-shared detection of the single spectrograph for interference signals of two channels of horizontal polarization and vertical polarization is realized by means of channel selection of the photoswitch, and the detected two polarization signals are calculated to acquire an intensity image, a fast axis image and a delay image of a sample with double refraction properties. The system provided by the invention is simple in structure; the light path adjusting difficulty is greatly reduced without using a beam splitter prism, and inter-mode interference brought by a polarization beam splitter is also avoided; and meanwhile, polarization imaging can be realized without complicated phase modulation equipment and algorithms.

The invention discloses a double-wavelength single receiving channel-based rotation Raman temperature measurement laser radar. The laser radar is based on two working wavelengths and a single receiving channel. The two working wavelengths of the laser radar are respectively composed of odd number pulses and even number pulses. The low-quantum-number rotation Raman signals of one working wavelength and the high-quantum-number rotation Raman signals of the other working wavelength are extracted by the receiving channel of the laser radar. The laser radar is operated alternately at the two working wavelengths in the time division multiplexing manner. The atmospheric temperature is calculated based on the ratio of high-quantum-number rotation Raman signals to low-quantum-number rotation Raman signals. According to the technical scheme of the invention, the rotation Raman temperature measurement is realized only by means of a single filter, a single detector and a single acquisition card. Compared with a single-wavelength double receiving channel-based rotation Raman temperature measurement laser radar, the above laser radar is compact in structure, wherein the difficulty of optical path adjustment and the difficulty of system parameter calibration are lowered. Meanwhile, the double-wavelength single receiving channel-based rotation Raman temperature measurement laser radar is low in cost. The working performance difference between the filter and the detector caused by the inconsistence of working environments can be avoided. Moreover, the detection accuracy, the system stability and the environmental adaptability are improved.

The invention discloses a hidden two-in-one dry type connection joint for prefabricated externally-hung wallboards. The hidden two-in-one dry type connection joint comprises the first prefabricated externally-hung wallboard, the second prefabricated externally-hung wallboard and a prefabricated superposed beam. A straight anchor bar built-in fitting with corbels is arranged in the prefabricated superposed beam; an upper supporting type built-in fitting is arranged on the upper portion of the first prefabricated externally-hung wallboard, and an out-of-plane limiting built-in fitting is arranged on the lower portion of the first prefabricated externally-hung wallboard; an upper supporting type built-in fitting is arranged on the upper portion of the second prefabricated externally-hung wallboard, and an out-of-plane limiting built-in fitting is arranged on the lower portion of the second prefabricated externally-hung wallboard; the out-of-plane limiting built-in fitting arranged on the lower portion of the first prefabricated externally-hung wallboard is connected with the upper supporting type built-in fitting arranged on the upper portion of the second prefabricated externally-hung wallboard to form a whole; the prefabricated superposed beam is arranged on one sided of the first prefabricated externally-hung wallboard and one side of the second prefabricated externally-hung wallboard, and the upper supporting type built-in fitting arranged on the second prefabricated externally-hung wallboard is fixedly connected with the straight anchor bar built-in fitting with the corbels. The hidden two-in-one dry type connection joint has the advantages of being convenient to mount and hidden.

The invention provides a short-term wind speed prediction method based on phased global optimization. A wind speed mixed prediction model characterized in that variational mode decomposition is employed for a time series data composition model, Gram-Schmidt orthogonal is employed for a feature extraction model and an extreme learning machine is employed for a basic learning model; a gravitationalsearch algorithm is employed for global optimization of the parameters of the wind speed mixed prediction model; the optimal prediction model parameters suitable for short-term wind speed prediction can be selected preferentially to achieve accurate prediction of the wind speed. The invention also provides a short-term wind speed prediction system based on phased global optimization.

The invention discloses an underactuation crane operating whole process active-disturbance-rejection control method of single parameter adjustment. The underactuation crane operation whole process active-disturbance-rejection control method is characterized in that according to starting and target locations of a trolley, safety constraint conditions such as the speed, acceleration, and operating environment of the trolley are considered, an ideal operating track, with efficiency priority, of the trolley is generated, and after compared with the actual location of the trolley, an error feedbackcontrol law of trolley movement is constructed; an expanding state observer is designed according to a crane load oscillation state equation, an error feedback control law suppressing load oscillation is constructed, and then the trolley operating track and a load oscillation active-disturbance-rejection controller which are independent of system model parameters and can effectively suppress disturbance are formed; and Hurwitz stable matrix eigenvalues are used for generating relation with control system gains, thus fussy control system parameters are adjusted and converted to single parameter adjustment easy to implement, a crane can be operated according to the set ideal track in the whole process under the uncertainty model parameters and external disturbance, and swing angles are madeas small as possible.

The invention relates to the technical field of immersed tube prefabrication construction, in particular to a dry dock sequential method full-section integral immersed tube prefabrication formwork system. The system comprises an inner mold system, an outer mold system and an end mold system, wherein the inner mold system is located on the inner side of an immersed tube casting space and is connected with the outer mold system located outside the immersed tube casting space into a whole through the end mold system positioned at the longitudinal end part of the immersed tube casting space, the lower end of the inner mold system is provided with an inner mold travelling support device which is used for carrying out longitudinal, transverse and vertical position adjustment on the inner mold system, and the outer mold system is an outer side formwork structure capable of being adjusted in the longitudinal direction, the transverse direction and the vertical position. The immersed tube prefabrication method has the advantages of being accurate in position adjusting, less in main body structure damage and capable of operating all weather, so that the technical problems of sequential prefabrication, adjacent operation, compact space, longitudinal long-distance travel of an ultra-large super-heavy formwork is long, being prone to deviation and the like which occur to a sequential methodare solved.

The present invention discloses an ultraviolet quasi-single pure-rotation Raman spectrum extraction-based all-day temperature measurement laser radar. The laser radar comprises a laser emitting unit, an optical receiving unit and a signal acquisition and control unit. The laser emitting unit emits the ultraviolet laser of 354. 82 nm in wavelength and the ultraviolet laser is adopted as a detection light source. The laser emitting unit sends a pulse laser beam to the atmosphere. The pulse laser beam and atmospheric particles interact to generate a series of discrete spectrum line scattering signals. The optical receiving unit receives the scattering signals through a telescope and then respectively and simultaneously extracts elastic scattering signals and quasi-single-branched anti-stoke pure-rotation Raman spectral line signals through three channels. The signal acquisition and control unit realizes the real-time acquisition and the inversion of signals, so that the normal and orderly operation of the entire laser radar system is ensured. According to the technical scheme of the invention, the signal-to-noise ratio of the system is enhanced, and the light-receiving path is optimized. The system stability is improved. The all-day detection of the atmospheric temperature, the aerosol space distribution and time evolution parameters is implemented.

The present invention relates to a method for implementing semiconductor laser light-beam shaping by utilizing off-axis total internal reflection prism array. It is characterized by that on the optical axis a light beam dividing array formed from reflection prisms with different displacements is adopted. Said invention also provides the concrete steps of said method and concrete structure of said off axis total internal reflection prism array. Said invention can easily implement the conversion of line beam to circular beam or square beam.

The invention relates to a high-power semiconductor laser device, especially a high-power light beam coupling semiconductor laser device, including two semiconductor laser devices with same wavelength and polarization state, a beam-expanding focusing device. The two semiconductor laser devices are deposited relatively on an optical axis, a right-angle polarization coupling prism with polarization membranous on its inclined surface is arranged on an optical path between the two semiconductor laser devices, a quarter wave plate is pasted on one right-angle surface of the right-angle polarization coupling prism, an emergent light beam of the laser is transmitted to the beam-expanding focusing device after reflecting by the right-angle polarization coupling prism, and the emergent light beam of the other laser is coupled to a beam to transmit after 90 DEG rotation of polarization direction by reflecting of the quarter wave plate. The paste placement of the quarter wave plate and the right-angle polarization coupling prism, and reduces device regulation difficulty and improves coupling efficiency, also improves the output power and lightness by two times without changing light beam quality.

The invention relates to a light path compensation based laser heterodyne interference measurement method and a light path compensation based laser heterodyne interference measurement device, belonging to the technical field of laser application. The invention adopts reference light and measurement light which are spatially separated from each other, and a light path compensation design is carried out; meanwhile, the method generates two interference measurement signals with opposite Doppler frequency shifts, and selectively uses the two measurement signals for carrying out interference measurement according to the movement direction and speed of a measured target. The method and the device provided by the invention not only reduces the influence of temperature change on the measurement, but also eliminates the frequency aliasing phenomenon in an interferometer, thus improving the measurement accuracy of heterodyne interference measurement; and furthermore, the problem of the limitation of laser source frequency difference to the measurement speed can be solved.

The invention relates to a device for detecting three-dimensional light intensity distribution in an optical focus region. The prior art adopts connection between an adjusting rack and a piezoelectric ceramics scanner, so measurement precision is influenced, and an optical machine has high positioning requirement and large difficulty of device realization. In the invention, a light source is shaped by a light beam shaper and is focused to form a tested focus by a field lens; a one-dimensional movable platform drives the field lens to realize axial movement for testing and coarse positioning; a three-dimensional movable platform drives a fiber probe to carry out three-dimensional scanning in a focus region to realize the detection of the three-dimensional light intensity distribution; a monitoring optical path consisting of a monitoring light source, a spectroscope and an image acquirer is coupled to a tested optical path by a spectrum spectroscope to monitor a device adjusting and testing process; and an analysis and control unit carries out analysis and control coordination on the whole testing process and a result. The device has the characteristics of low requirement on mechanical processing and positioning, simple system composition, low requirement on devices, high measuring precision, convenient use, and the like.

The invention discloses a small distortion large vision field stereo endoscope object lens structure. The small distortion large vision field stereo endoscope object lens structure comprises a direct vision endoscope and a strabismus endoscope, wherein the direct vision endoscope sequentially comprises protection glass, a first negative lens, a second negative lens, a parallel flat board, a flat convex lens and a subsequent glued lens group along a light spreading direction, and the strabismus endoscope sequentially comprises protection glass, a first negative lens, a second negative lens, a parallel flat board, a turning prism, a flat convex lens and a subsequent glued lens group along the light spreading direction. The small distortion large vision field stereo endoscope object lens structure has an ingenious structure, the two negative lenses are in front of a diaphragm, the first negative lens is a flat concave negative lens, the second negative lens is a convex concave negative lens, the two negative lenses are organically combined, system distortion can be corrected through optimization design, so large vision field small distortion endoscope optics systems can be designed out, the first negative lens and the second negative lens are respectively glued to the parallel flat board, the technology is good, positioning precision is high, the sealing technology is improved, and assembly and adjustment cost is reduced.

The invention discloses an ammonia spraying and mixing system for the coal-fired flue gas SCR denitration technology and relates to a system used for spraying reducing agent ammonia and strengthening the mixture of ammonia and flue gas. The ammonia spraying and mixing system comprises 5-20 reducing agent ammonia jet tubes with independent flow control systems and longitudinal vortex generation elements, wherein the tail end of each reducing agent ammonia jet tube is provided with a two-way nozzle which is vertical and symmetric to the flue gas stream, each longitudinal vortex generation element is a triangle, a trapezoid, a half round or a half ellipse, each longitudinal vortex generation element is connected with the flue wall and forms 30-60 degrees angle with the flue gas stream so as to form longitudinal vortex of which downstream is stable, increase the intensity of turbulent flow and enhance the mixture of reducing agent ammonia and glue gas. The device has the following advantages: 1) the stable longitudinal vortex is formed, the mixing intensity of vortex is increased, and the mixing effect of ammonia and nitrogen is optimized; 2) the number of the ammonia jet tubes is reduced, the ammonia-spraying regulation difficulty is lowered; and 3) pressure breakdown caused by the system is relatively small and the energy loss is reduced.

The invention discloses a Terahertz reflection imaging system based on zero order Bessel wave beams. The system comprises a Terahertz emission source, a collimating lens, a silicon chip, a diffractionelement, a focusing lens, a Terahertz detector, a sample table, a sample table moving device, a lock phase amplifier and a control module, wherein the collimating lens, the silicon chip, the diffraction element and the sample table are in sequential arrangement in a direction along the transmission direction; the center of the silicon chip is positioned in the center axial line of the transmission wave beams; an included angle between the silicon chip and the center axial line is 45 degrees; the main optical axes of the collimating lens and the diffraction element are positioned in the centeraxial line of the transmission wave beams; through the diffraction element, the transmission wave beams become the zero order Bessel wave beams; the main optical axis of the focusing lens is positioned on a reflection light path and is vertical to the center axial line of the transmission wave beam; the Terahertz detector is positioned on the focal plane of the focusing lens and is connected withthe lock phase amplifier; the control module is respectively connected with the sample table moving device and the lock phase amplifier. The Terahertz reflection imaging system can simultaneously provide high imaging quality and large depth of field.