143results about How to "Realization of generation" patented technology

The invention discloses detection equipment and a detection method. The detection equipment comprises a sampling device used for collecting a sample to be detected, a preprocessing sample injection device used for preprocessing the sample from the sampling device, and a sample analysis device used for separating the preprocessed sample from the preprocessing sample injection device and analyzing the separated sample. The detection equipment is miniaturized, can quickly and accurately detect gas-phase matters or particulate matters without unpacking, and is high in accuracy and suitable for security check of airports, ports, metro stations and the like.

The invention relates to an eight-channel DDS signal source board, belonging to the technical field of digital signal processing. The eight-channel DDS signal source board comprises an analog power supply module, a digital power supply module, a clock source module, an intermediate frequency signal generation module and a logic control module. 0-400 MHz intermediate frequency signals of eight-channel are generated by using a programmable hardware structure and a DDS chip of a 1G reference clock; the eight-channel DDS signal source board is characterized by universality, expandability and capability for being programmed independently for each channel; the software is combined with the hardware to solve the phase synchronization problem among a plurality of channels under condition of usinga high-frequency reference clock; and the signal source board is used for the generation of active phased array radar emitting signals and occasions needing multi-channel and synchronous intermediatefrequency signals.

The invention provides a method for storing and taking articles through a locker system. The locker system comprises a locker, an electronic coded lock, a control system, a system power supply, a communication module and a user communication terminal, wherein the communication module is connected with the control system, and the user communication terminal is connected with the communication module through a communication network. The method for storing and taking the articles through the locker system includes the following steps of firstly, enabling the number of the user communication terminal of a user who is about to store the articles to be pre-stored through the control system, and binding the number of the corresponding locker with the number of the user communication terminal of the user according to the requirements of the user; secondly, enabling the control system to open the corresponding locker according to the requirements of the user so that the articles can be stored; thirdly, enabling the control system to calculate the code and to be in communication with the user communication terminal of the user so as to transmit an unlocking dynamic code key; finally, opening the corresponding locker to take the articles according to the dynamic code when the user takes the articles.

The invention discloses a preparation method for a sausage, comprising the steps of selecting materials, wringing, mixing materials, pickling, filling, baking, cooling, inspecting and packaging, wherein the baking process is as follows: circularly heating a heating pipe in the heating pipe by steams in a bakery built by brick structures; heating the bakery to 40 degrees centigrade; and then putting the filled sausages in the bakery; controlling the steam flow so that the sausages are baked for 4 hours when the bakery temperature is 45-50 degrees centigrade; preliminarily removing the moisturein the sausages; after 4 hours, heating the bakery to 60-63 degrees centigrade so as to bake the sausages for 7-10 hours continuously ; finally, stopping steam supply; and cooling to room temperature. The preparation method for the sausage has the following advantages: the food preparing link is safer by using the process; and the benzopyrene is avoided.

The invention discloses detection equipment and a detection method. The detection equipment comprises a sampling device, a pretreatment sampling device and a sample analysis device, wherein the sampling device is used for collecting to-be-detected samples; the pretreatment sampling device is used for pretreating samples from the sampling devices; the sample analysis device is used for separating pretreated samples from the pretreatment sampling device and analyzing separated samples. According to the detection equipment disclosed by the invention, miniaturization is realized, gas-phase matters or particulate matters can be quickly and accurately detected under an unpacking situation, the accuracy is high, and the detection equipment is suitable for safety inspection of airports, ports, subway stations and the like.

The invention relates to a method for in-situ reduction restoration of polluted groundwater. In a groundwater pollution zone, by injecting formate and persulfate into an underground environment through two injection wells and performing thermal activation on the persulfate and the formate, carbon dioxide ion free radicals with high reducibility are prepared to reduce heavy metals and chlorinated organic pollutants and remove target polluted components, so as to achieve an aim of restoration. According to the method provided by the invention, activation is realized by heating without externally adding transition metals, and the generation of free radicals and the removal of pollutants can be achieved under the condition that chemical conditions including a pH value, a dissolved oxygen content and the like of the groundwater are not adjusted. A carbon dioxide free radical is a high-reducibility free radical, reacts quickly and efficiently with the pollutants, and can be widely applied to restoration of underground polluted environments.

The invention discloses a method for co-producing TC4 titanium alloy round ingots / flat ingots through a VAR furnace and a 7-gun cold cathode EB furnace. The method comprises the following steps of: averaging within a component range stipulated by the national standards as a datum value; increasing a datum value of an element Al and reducing a datum value of an element V, and then, taking the elements Al and V as proportioning components of brinqueting batch; covering alloy package in proportion, pressing sponge titanium and alloy package into an electrode block, and adopting a plasma welding machine to weld the electrode block into a long electrode; and smelting the long electrode into primary cast ingot through the VAR furnace, and performing secondary smelting on the primary ingot smelted by the VAR furnace through the 7-gun cold cathode EB furnace, thereby obtaining very-large-scale high-quality TC4 titanium alloy round ingots / flat ingots. The method is convenient to operate, can realize control on elements aluminum and vanadium, can greatly improve stability of the elements aluminum and vanadium in cast ingots of the TC4 titanium alloy, and further improves quality of the conventional TC4 titanium alloy product, so that the product obtains good market competition ability.

The invention discloses a method for recycling zinc, indium, iron and gallium from iron vanadium slag. The method specifically comprises the steps of uniform mixing of an additive with the iron vanadium slag, grinding, pelletizing, oxidized roasting desulfurization, direct reduction, melt separation and the like. In the pelletizing process, the special additive is adopted, and the additive comprises an organic binding agent, an alkali earth metal source, an alkali metal source, carbonaceous fuel and ferric oxide. It is verified through a great number of researches and tests that, through the additive, the pellet roasting desulfurization and solidification effects can be enhanced and improved, the roasted pellet strength is improved, the roasted pellet reducibility is improved, the pellet reduction expansion rate is lowered, and a qualified furnace material is provided for pyrogenic-process efficient separation and extraction of multiple types of valuable elements, such as, the iron, gallium, zinc, indium and sulphur.

The invention provides a liquid crystal device and a 3D printing system. The liquid crystal device comprises a first liquid crystal box and a second liquid crystal box which are parallel to each otherand arranged in an overlapped mode. The first liquid crystal box is a bi-stable liquid crystal box. Through the strong reflection ability of the first liquid crystal box on light under the powered-off condition and the blocking effect of the second liquid crystal box on the light under the powered-off condition, the light transmissivity is decreased jointly, the black state is generated, the transmissivity of the black state is decreased, thus the contrast ratio of the liquid crystal device can be increased, and the printing accuracy of the 3D printing system can be improved.

The invention discloses a hidden underwater acoustic communication method based on environmental perception, and relates to underwater acoustic communication. Before information to be transmitted is transmitted, detection perception is performed on the environment at first, according to different types of interference and distribution of different spectra, on the basis of the requirement of a system, the transform domain type of the design is specifically determined, spectrum detection perception type and parameter selection is achieved through the underwater acoustic transform-domain communication system, and hidden information is transmitted and received; a primary function of the system is selected; information sequence waveform design protection is performed; underwater acoustic transform-domain communication is performed; information extraction of information signals is performed. The information sequence waveform design is achieved, hidden information synchronous transmission isensured, marine biological signals are ordinarily selected as carrier signals, and information transmission transparency and remote transmission are ensured. Meanwhile, due to hidden underwater acoustic communication based on environmental perception, high-robustness hidden information encryption can be obtained, the stronger attack can be resisted, and the hidden information communication trafficcan be improved at any carrier signal.

The invention relates to a broadband tripolar reconfigurable filter antenna with high gain, which belongs to the technical field of antennas. The filter antenna comprises three dielectric substrates,a laminated patch, a driving patch, a feeder part, a coaxial cable and a grounding plate. Three dielectric substrates are laminated. The laminated patch is arranged on the upper surface of the upper dielectric substrate. The driving patch is arranged on the upper surface of the intermediate dielectric substrate. A pair of back-to-back U-shaped grooves is etched on the driving patch. The feeder part comprises a rectangular coupling strip, a metal pillar and a power dividing phase shifting network. The rectangular coupling strip is arranged on the lower surface of the intermediate dielectric substrate. The power dividing phase shifting network is arranged on the upper surface of the lower dielectric substrate. The rectangular coupling strip is connected with the power dividing phase shiftingnetwork through the metal pillar. The grounding plate is arranged on the lower surface of the lower dielectric substrate. The coaxial cable is arranged at the center of the grounding plate. The antenna provided by the invention has the characteristics of simple structure, good frequency selection and out-of-band suppression.

The invention discloses a storage battery voltage balancing device and belongs to intelligent charging and discharging control devices of storage battery packs for direct-current power sources in an electrical power system. A storage battery charging control circuit is connected with a single chip, a storage battery managing chip is connected with the single chip via an SPI (serial peripheral interface) bus. In a storage battery voltage acquisition circuit, a storage battery pack is formed by a plurality of storage batteries which are mutually serially connected, and a positive electrode of every storage battery in the storage battery pack is connected with the storage battery managing chip. In a storage battery discharging control circuit, the positive electrode of every storage battery is connected with a source electrode D of a P-type MOSFET (metal-oxide -semiconductor field effect transistor), and the negative electrode of every storage battery is connected with the storage battery managing chip. During discharging, only overcharged batteries are discharged; and during charging, only batteries with low capacities are charged. The storage battery voltage balancing device is small in size, low in noise, high in reliability and real-time in control.

The invention discloses a constructing method and a device for a single-chamber medium-free algae microbial fuel cell. The single-chamber medium-free algae microbial fuel cell is prepared by: A) a step of algae microorganism screening, namely a step including 1) algae microorganism enrichment, 2) separation and purification; and 3) algae microorganism screening to obtain an algae microorganism suspension; and C) a step of adding the obtained algae microorganism suspension into the device. The algae microorganism suspension is added into a glass container. An anode carbon rod and a cathode carbon rod are inserted into the glass container. The cathode carbon rod is coated with nitrocellulose. The anode carbon rod and the cathode carbon rod are connected to two ends of a resistance, an amperemeter and a voltmeter through wires. The amperemeter is connected in series between the anode carbon rod and the resistance through wires. The voltmeter is connected in series to the two ends of the resistance and the amperemeter through wires. One side of the anode carbon rod faces light. The method and the device have characteristics of simple operation, simple structure, using convenience, no need of proton exchange membranes and electronic media, high efficiency, and capability of degrading organic pollutants at the same time of effectively utilizing light energy to generate power.

The invention provides a process for producing glycine byproduct ammonium chloride. The process comprises the following steps: by taking a chloroacetic acid solution as a raw material, carrying out an ammonolysis reaction with ammonia through catalysis of urotropine; performing negative pressure condensation on the reaction solution, cooling and crystallizing to obtain a mixture of glycine and ammonium chloride; and performing gradient cooling on the mixture so as to obtain glycine and high-purity ammonium chloride, and recycling the mother solution. According to the process disclosed by the invention, continuous production of glycine is realized, the production efficiency is improved, the labor intensity is reduced, the equipment input is reduced, and the catalyst, urotropine, can be recycled in the reaction by adopting the recycling process for the alcohol-phase reactive mother solution. Moreover, the ammonium chloride is separated by adopting the concentrating, cooling and crystallizing process, the usage amount of methanol is reduced, the energy consumption is reduced, and residual liquor is avoided.

The invention provides a vertical continuous crystallization process of pre-crystallization, which belongs an improvement of a crystallized glucose production way. Firstly starch milk is liquefied, saccharified, filtered and bleached, evaporated and concentrated to get the sugar solution. Secondly the sugar solution is brought in a flash pot for further evaporation and concentration. Thirdly the sugar solution is continuously sent into the vertical continuous pre-crystallization pot for crystallization for 20 hours to 40 hours. Fourthly part of the pre-crystallized crystal slurry is sent into the vertical continuous pre-crystallization pot as crystal seed, and they're mixed with the filtered and concentrated sugar solution in the vertical continuous pre-crystallization pot for crystallization. Finally the high crystal grain slurry is obtained after 20 to 30 hours crystallization. The invention brings the pre-crystallized slurry into the vertical continuous pre-crystallization pot as the crystal seed, thus increasing the crystal seed, improving the glucose crystallization speed, and reducing the crystallization cycle. The invention also improves the crystallization yield rate and product quality, as well as realizes continuous production.

The invention relates to a nickel-making oxygen-enriching top-blowing immersion spray gun with longer service life. The diameters of a cover cylinder, an air pipe and an oxygen pipe of the spray gun successively decrease gradually, and the cover cylinder, the air pipe and the oxygen pipe of the spray gun are arranged coaxially; a mixing chamber is arranged on the outlet end of the spray gun; a multi-stage swirler is arranged between the air pipe and the oxygen pipe of the spray gun; a single-stage swirler is arranged between the oxygen pipe and the fuel pipe of the spray gun; the single-stage swirler is a blade type swirler; and the multi-stage swirler is a six-stage blade type swirler. Due to the arrangement and improvement of the swirlers, the cooling degree is strengthened. Due to the arrangement of a fin, the bending degree of the spray gun is reduced effectively, oxygen and the air of the spray gun are mixed in advance, higher combustion efficiency is achieved, and the fuel is prevented from being adhered to the inner wall of the mixing chamber to burn down the inner wall of the mixing chamber. Because an air stop ring plate is arranged near a sleeve air outlet, the secondary combustion of carbon monoxide on the upper part of the furnace is realized, and the generation of elemental sulfur is inhibited effectively. The immersion depth of the spray gun can be controlled stably, the service life can be prolonged, and the change frequency can be reduced. In addition, the production operation rate can be reduced, and the production cost can be saved.

The invention relates to improvement on preparation technology for dimethyl diethoxy silane. The referred dimethyl diethoxy silane comprises the following chemical raw materials and neutralization treating agents in part by weight: 100 parts of dimethyl dichloro silicane, 150 parts of absolute ethanol, 0.05 part of sodium ethylate, 0.02 part of hexamethyldisilazane and 0.01 part of amino monomer.The preparation technology has the advantages of increasing the height of an alcoholysis kettle to make the alcoholysis reaction more sufficient, raising the reaction temperature to make chlorine in the materials better substituted to ensure full reaction and increase the yield rate, enlarging a comprehensive tank to reduce the consumption of a neutralizing agent and save the neutralizing agent, adding an external circulating pump and a gas filtration pump to realize continuous production by the alcoholysis reaction, increase the reaction speed and reduce byproducts generated by the overlong reaction, adding a settling tank which is favorable for performing rectification reaction to isolate air, eliminate salt slurry, reduce corrosion and protect a rectification tower.

The invention provides a chip internal logic verify system characterized by comprising the following units: a main control module used for sending a control signal to a tested chip according to a control order and receiving a feedback signal of the tested chip; a level transition module used for carrying out level transition between the tested chip and the main control module; at least one I / O module used for connecting with the tested chip, wherein the I / O module is connected with the main control module through the level transition module. The system and method can test and verify the programmable chip internal logics; the chip internal logic verify system can test and verify chips in batch, thus reducing operation people workload, and improving testing efficiency and test coverage rate.

The invention discloses a production device and a production method for achieving stable denitrification of nitrite in continuous flow, and belongs to the technical field of biological sewage treatment. The method comprises the following steps: with lightweight suspended filler as a carrier, attaching short-range denitrifying sludge on the surface of the filler; and with an organic carbon source in inflow water as an electron donor, continuously reducing nitrate in inflow water into nitrite. According to the production device and method, the electron donor can be lastingly provided for an anaerobic ammonia oxidation technology; the problems of sludge flotation and loss in an upflow denitrification reactor are effectively solved; in addition, the reactor disclosed by the invention is simple in structure, small in floor area, low in cost and beneficial to popularization.

The invention discloses a vehicle compound transmission shaft and a preparation method thereof. The vehicle compound transmission shaft comprises a fiber reinforced polymer (FRP) pipe, metal connecting pieces and reinforcement sleeves. The pipe walls of the two ends of the FRP pipe are uniformly provided with a plurality of through holes. The metal connecting pieces have the same outer diameter asthe inner diameter of the ends of the FRP pipe. The metal connecting pieces are annularly provided with a plurality of concave holes corresponding to the through holes in number and position. The twometal connecting pieces are coaxially connected to the two ends of the FRP pipe correspondingly and are fixed through pin shafts penetrating through the through holes and the concave holes. The reinforcement sleeves are connected to the ends of the FRP pipe in a sleeving mode and cover the pin shafts. According to the adopted braided pultrusion FRP pipe, the inner and outer walls are smooth, thethickness of the pipe wall is uniform, the dynamic balance performance is good during high-speed operating, the axial and circumferential strength and stiffness are high, the interlayer torsional strength is high, the preparation process is simple, and the overall reliability is high. Through the reinforcement sleeves, the strength defect of punched holes is overcome, external restraint is realized, and meanwhile, a workblank is prevented from being generated on the outer side of a center shaft in the using process.

The invention relates to the technical field of washing equipment, particularly provides a detergent feeding method for the washing equipment, and aims to solve the problem that the feeding amount ofa detergent cannot be accurately judged by conventional washing equipment. In order to achieve the purpose, the detergent feeding method comprises the steps of obtaining a preset feeding amount threshold value of the detergent when the washing equipment runs a washing program last time; acquiring foam quantity in a washing barrel when the washing equipment runs the washing program last time; obtaining the turbidity of washing water when the washing equipment runs the washing program last time; and determining the feeding amount of the detergent when the washing equipment runs the washing program again according to the preset feeding amount threshold value, the foam quantity and the turbidity. According to the preset feeding amount threshold value, the foam quantity and the turbidity, the feeding amount of the detergent when the washing equipment runs the washing program again is determined, the purpose of adding the most reasonable amount of the detergent to a to-be-washed object is achieved, the waste of the detergent is avoided, and the to-be-washed object is better washed.

The invention relates to an air-bubble drag reduction device for a ship. The air-bubble drag reduction device for the ship comprises an air inlet pipe which is mounted directly in front of a hull; anair bubble generation device is connected to the air inlet pipe; a water wing, which is arched towards the air outlet end direction of the air inlet pipe, is arranged on the air bubble generation device; an area between the upper end surface of the water wing and the air outlet end of the air inlet pipe forms a negative pressure area during the advancing of the hull; and airflow introduced to thenegative pressure area from the air inlet pipe forms a bubble flow at the bottom of the hull under a shearing effect of the hull. According to the air-bubble drag reduction device for the ship, due tothe specificity of the structure, the structural characteristics of the water wing and a stagnation point generated at the front end of the hull are sufficiently utilized to generate air bubbles under a situation of no energy consumption without using a power source; and meanwhile, the water wings with a plurality of types can enable the ships with different speeds can generate stable micro bubbles at the bottoms of the hulls in the navigation process; and therefore, a drag reduction effect is realized.

The invention discloses visible light excited fluorescent carbon quantum dots and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving citric acid and urea in water, thus obtaining a precursor solution; (2) carrying out microwave reaction on the precursor solution, thus obtaining a carbon quantum dot solution; (3) filtering and drying the carbon quantum dot solution, thus obtaining the visible light excited fluorescent carbon quantum dots. The excitation wavelength of the carbon quantum dots is visible wavelength, the stability is good, and the carbon quantum dots can be applied to aspect of bioimaging and detecting.

The invention relates to an improved method and system for producing methane by using a two-phase anaerobic digestion process, belonging to the field of recycling of the waste. The method comprises the following steps: maintaining headspace pressure in a hydrolytic acidification reactor at 3.0 to 3.5 psi and transferring unwanted gas in the hydrolytic acidification reactor to a methane reactor for reuse. The system comprises the hydrolytic acidification reactor, a methanation reactor, a methane gas collecting device and pressure transducer. The improved method and system provided by the invention have the characteristics of high efficiency, low cost, simple operation, reduction in carbon footprint and the like, realize the chemical oxygen demand (COD) and methane yield of 0.65 to 0.84 g per g of a volatile solid and 0.32 to 0.36 L per g of the volatile solid respectively, increases of 16 to 50% and 28 to 44% respectively compared with conventional design.

The invention provides a cascade type high-temperature heat pump steam generator, and relates to the high-temperature heat pump technology. The steam generator comprises a low-temperature stage circulation system, a high-temperature stage circulation system and a middle heat exchange device, and is further provided with a water supply preheating and heating system, and the water supply preheatingand heating system comprises a water supply preheater, a water storage tank, a water pump and an electromagnetic oven heater; the inlet end of a circulating working medium of the water supply preheater is connected with a low-temperature stage compressor in the low-temperature stage circulation system, the outlet end of thecirculating working medium of the water supply preheater is connected witha low-temperature stage liquid storage tank, the water inlet end of the water supply preheater is connected with the water storage tank through the water pump, the water outlet end of the water supplypreheater is connected with the water inlet end of a condenser, and the water outlet end of the condenser is connected with the electromagnetic oven heater. According to the steam generator, a preheating water supply mode, a heat pump system, cascade type circulation and the variable frequency compression technology are organically combined, an environment-friendly and feasible circulation process is designed and provided, and the heat economic benefit of the cascade heat pump system is improved.

The invention provides an immune hematogenesis anti-cancer preparation for treating leukemia and a preparation method thereof. The immune hematogenesis anti-cancer preparation consists of the following medicines of: (1) twenty flavors such as fried rhizoma polygonati, astragalus mongholicus, Chinese angelica, white paeony root, barbary wolfberry fruit, agrimonia pilosa ledeb, coptidis rhizome, gypsum, folium isatidis, gynostemma pentaphylla, antrodia camphorate polysaccharide and superoxide dismutase (SOD) for the acute lymphoblastic leukemia; and (2) and twenty flavors such as cortex lycii radicis, red flower, stir-baked squama manitis, dried rehamnnia root, cortex moutan, radix pseudostellariae, Chinese yam and tortoise plastron for the chronic myelogenous leukemia. The immune hematogenesis anti-cancer preparation is a pure traditional Chinese medicine preparation prepared into capsules through the steps of: soaking, filtering and concentrating through magnetized water, ultrasonically crushing the cytoplasm and performing spray drying. The preparation has the obvious effects of clearing away heat and toxic materials, nourishing yin and promote the secretion of saliva or body fluid, enhancing the immunity and stimulating and recovering the medullary hematopoiesis function, and the diseases are difficult to recur.

The invention discloses a method for realizing ecological cycle by combining planting and breeding in a sugarcane field. The method comprises the following steps: interplanting corns in the sugarcanefield at the early growth stage of sugarcane, processing fresh silage corns and sugarcane tail tips into a pig feed, and preparing biochar from withered straws; building a hog house and a chicken house beside the sugarcane field for raising pigs and chickens, wherein a cleaning waste liquid and pig urine of the hog house and the chicken house are used for drip irrigation of the sugarcane field, and excrement of the pigs and the chickens is used for raising hermetia illucens; feeding the chickens with produced hermetia illucens, after the chickens are hatched, breeding the chickens in the chicken house in a captive mode to a sugarcane elongation stage, and stocking the chickens to the sugarcane field; and preparing the hermetia illucens treated excrement and the biochar into a bio-organic fertilizer, and applying the bio-organic fertilizer to the sugarcane field so as to provide nutritional ingredients for growth of the sugarcane and the silage corns. By using of the method provided bythe invention, the sugarcane and the corns are planted; the pigs, chickens and hermetia illucens are bred; low input and high output of the sugarcane field can be achieved; and the ecological conceptof cyclic utilization is met.

The invention provides a hydrodynamic foam generator, aiming at solving the technical problem of automatically acquiring raw water and a cleaning agent with the involvement of less equipment and the technical problem of automatically generating foam and spraying the foam without the assistance of electrical equipment. The foam generator comprises a mixing cavity; under hydraulic pressure, the mixing cavity is used for controlling suction of the cleaning agent and the raw water and for blending the cleaning agent and the raw material; a mixed solution is turned into foam by virtue of a spraying head of a foaming device, and the foam is beaten into a water closet; the water closet can achieve self-cleaning mainly by virtue of the foam generator; a water inlet of the foam generator communicates with a water intake pipe of the original water closet by virtue of a pipeline and a switch, and the switch, by virtue of a sensor which can sense the approximate state of a human body, is used for determining whether the foam generator is started or not; the foam generator is simple in structure and low in manufacturing cost; and meanwhile, the foam generator can generate fragrance through the aroma of the cleaning agent, so that people can feel happy.

The invention relates to a comb spectrum generation device and a method based on a double spectrum line cyclic frequency shift mode. The device comprises a quadruplicated frequency system and a cyclic frequency shift loop, wherein the quadruplicated frequency system comprises a cascaded dual-electrode Mach-Zehnder modulator, a cosine microwave signal source, a phase shifter and the phase shifter; and the cyclic frequency shift loop comprises a 3dB coupler, a polarization controller (PC), the cascaded dual-electrode Mach-Zehnder modulator, the cosine microwave signal source, the phase shifter, the phase shifter, a semiconductor optical amplifier (SOA), an optical filter, an adjustable delay line, a direct-current bias power supply and an optical fiber which is random in length but short as much as possible. The method comprises the steps as follows: firstly, generating two flat spectrums with an interval of 12.5 GHz through the quadruplicated frequency system; secondly, transmitting the spectrums into the loop for cyclic frequency shift; thirdly, carrying out down-conversion on every two spectrum lines through the loop, circulating in sequence, and compensating power through the SOA; and lastly, filtering out 16 required flat spectrum lines through the optical filter.