73 results about "Dual frequency ultrasound" patented technology

A dual-frequency ultrasound transducer, comprising a piezo-electric element bonded to a substrate, has two resonant vibration modes: a low frequency mechanical bending resonance mode and a relatively high frequency thickness resonance mode. The low frequency bending resonance mode occurs when the piezo-electric element is excited, in use, by a voltage which includes a low frequency oscillating component. The high frequency thickness resonance mode occurs when the piezo-electric element is excited, in use, by a voltage which includes a relatively high frequency oscillating component. The transducer may include a mounting arrangement, such as a support ring securing the periphery of the substrate to an underlying base layer that enhances the depth of penetration and focus of the ultrasound.

The invention provides a biological tissue matrix material, and a preparation method and a purpose thereof. The biological tissue matrix material is characterized by comprising an extracellular matrix, wherein the extracellular matrix comprises collagenous fiber, growth factors and fibronectin. The biological tissue matrix material is prepared from small intestinal submucosa matrix materials. The preparation method is characterized by comprising the following steps that decellularization is performed: decellularized liquid contains trypsin and PBS solution, and also contains EDTA, EDTA-2Na or EDTA-4Na; the decellularized liquid is used for treatment in multi-frequency ultrasonic environment for decellularization; the dual-frequency ultrasound at least contains two ultrasonic frequencies with different frequencies. The decellularization process technology is improved; the DNA residual quantity of the obtained product is lower; the immunogenicity is lower; the anti-infection capability is higher; the restoration capability is higher.

The invention discloses a device and a method for ultra precise polishing of a double-frequency acoustic cavitation nanofluid under the magnetic control action. The device comprises a polishing liquid pool, a hydraulic pump, an ultrasonic reactor, a double-frequency ultrasound device, a nano-abrasive container, an alternating current power supply, an alternating current coil and a workpiece frame. The method is realized mainly through the following steps: (1) a polishing liquid is placed in the polishing liquid pool, and then is sent in the ultrasonic reactor through the hydraulic pump; (2) nano-abrasives are placed in the nano-abrasive container, and flow into the ultrasonic reactor through a third connecting pipe; (3) the polishing liquid and the nano-abrasives are mixed in the ultrasonic reactor into a nano-abrasive and polishing liquid mixed solution, and the mixed solution is subjected to acoustic cavitation under the action of the double-frequency ultrasound device; (4) the mixed solution is ejected under acoustic cavitation and pressure; (5) the alternating current coil generates an alternating current magnetic field, and the ejected nano-abrasive and polishing liquid mixed solution polishes a workpiece under the action of the alternating current magnetic field. According to the device and the method, the plane and the curved surfaces of parts are polished with high precision, high consistency and high surface quality.

The invention discloses a method for detecting a flight time of an ultrasonic wave in flow speed measurement and belongs to the technical field of detection of an ultrasonic wave instrument. The technical scheme of the method is as follows: the flight time of the ultrasonic wave is calculated by a method of double-frequency ultrasonic wave phase detection so as to effectively increase the range of instrument measurement. In addition, the method for detecting the flight time of the ultrasonic wave in the flow speed measurement is different from other multi-frequency ultrasonic wave measuring methods, and a solution under a condition that the phase drifting exits in a sensor is provided, so that the method has better practicability in the detection of the flow speed or the flow rate of the ultrasonic wave.

The invention discloses a double-frequency ultrasonic chemical reactor which is characterized by adopting a cylinder body structure and comprising an outer cylinder, an inner cylinder, a bottom plate, a lifting cylinder in the inner cylinder, a water inlet pipe and a water outlet arranged on the side wall of the outer cylinder, wherein a cover plate is arranged on the inner cylinder; two groups of ultrasonic transducers outside the cylinder body are respectively arranged on the cover plate and the bottom plate; one group of ultrasonic transducers consist of top high-frequency ultrasonic transducers and top low-frequency ultrasonic transducers, which are mutually spaced and uniformly distributed on the cover plate; and the other group of ultrasonic transducers consist of bottom high-frequency ultrasonic transducers and bottom low-frequency ultrasonic transducers, which are vertically and relatively arranged on the bottom plate. The invention effectively enhances the distribution uniformity of an ultrasonic acoustic field in the reactor, obviously increases the ultrasonic cavitation efficiency, prolongs the service life of equipment and can be applied to various industrial waste water, particularly to the degradation of high-concentrated organic waste water.

The invention discloses a method for extracting sinomenine hydrochloride from caulis sinomenii. The method comprises the following steps: crushing sinomenium acutum roots; sieving by a 40-mesh sieve; adding 5-8 times of a 60-70% ethanol liquid; extracting for 1-2 hours in a double frequency ultrasonic device; filtering and decompressing and concentrating; and purifying the filtrate by virtue of column chromatography on silica gel to obtain high purity sinomenine hydrochloride. The method disclosed by the invention is simple in process and high is recovery rate and the separated sinomenine hydrochloride is high in purity.

The invention discloses a method for extracting piperis longi volatile oil and particularly relates to a method for extracting piperis longi volatile oil by employing double-frequency ultrasonic wave. The method comprises the following processing steps: (1) pretreatment of piperis longi medicinal material; (2) double-frequency ultrasonic wave extraction; and (3) extraction by using an organic solvent, drying and dewatering anhydrous sodium sulfate, and carrying out vacuum concentration so as to obtain the piperis longi volatile oil. The piperis longi volatile oil is extracted by adopting the double-frequency ultrasonic wave, the method is simple in process, short in extraction time and low in energy consumption, the yield of volatile oil is significantly higher than that of the traditional extraction method, and the method is suitable for industrial production.

The invention relates to a method for extracting asiaticoside from centella. The method for extracting the asiaticoside from the centella comprises the following processing steps: smashing raw materials, sieving by adopting a sieve with 80 meshes, fermenting by adopting compound enzyme, adding 50-60% ethyl alcohol with the amount being 5-8 times that of the raw material into the fermented raw material, placing the obtained mixture into a double-frequency ultrasonic extractor, extracting at the temperature of 50-60 DEG C for 60-90 minutes with ultrasonic frequencies being 40KHz and 80KHz and power being 400-600W, filtering, concentrating, carrying out petroleum ether-water extraction, taking a lower layer, and carrying out separation and purification by virtue of an alumina column, concentration and recrystallization, so that the asiaticoside is obtained. The method for extracting the asiaticoside from the centella is short in extraction time, high in yield, easy in operation, safe and reliable, high in efficiency and energy-saving and is applicable to industrial production.

The invention discloses a cleaning process of an optical glass lens. Firstly, cleaning fluid is combined with high-voltage pulse electric field treatment and double-frequency ultrasonic wave alternatetreatment for cleaning, oil dirt, dirt and other contaminants on the surface of the optical glass lens can be effectively removed, high-voltage pulse electric field treatment cooperates with taurinedihydroxyethyl amine oxide and cetyl pyridinium chloride in the cleaning fluid, mildew on the surface of the optical glass lens can be effectively killed, a good vibration effect is achieved through the cooperation of high-voltage pulse electric field treatment and double-frequency ultrasonic wave alternate treatment, the oil dirt, the dirt and other contaminants on the surface of the optical glass lens can be effectively separated out, and the cleaning effect is improved; and then deionized water is combined with double-frequency microwave alternate treatment and double-frequency ultrasonic wave alternate treatment for washing, the oil dirt, the dirt and other contaminants on the surface of the optical glass lens can be further removed through the vibrating performance of double-frequencymicrowave alternate treatment and double-frequency ultrasonic wave alternate treatment, and the cleaning efficiency is improved.

The invention discloses a double-frequency ultrasonic transducer and ultrasonic detection equipment. The double-frequency ultrasonic transducer comprises a low-frequency unit and a high-frequency unit; the low-frequency unit and the high-frequency unit share a backing layer, the low-frequency unit further comprises a low-frequency flexible circuit board layer, a low-frequency piezoelectric layer and a low-frequency matching layer, and the high-frequency unit further comprises a high-frequency flexible circuit board layer, a high-frequency piezoelectric layer and a high-frequency matching layer; or, the low-frequency unit and the high-frequency unit share the backing layer and a flexible circuit board layer at the same time, the flexible circuit board layer annularly wraps the periphery ofthe backing layer, the low-frequency unit further comprises a low-frequency piezoelectric layer and a low-frequency matching layer, and the high-frequency unit further comprises a high-frequency piezoelectric layer and a high-frequency matching layer. The double-frequency ultrasonic transducer is provided with the low-frequency unit and the high-frequency unit which can independently emit low-frequency ultrasonic waves and high-frequency ultrasonic waves, and the low-frequency unit and the high-frequency unit can work separately or simultaneously and do not interfere with each other; and the function of low-frequency and high-frequency ultrasonic detection can be realized, and the characteristic of small size can be obtained.

The invention provides a novel acousto-optic catalytic water purification device and a working method thereof. The novel acousto-optic catalytic water purification device is characterized in that an ultrasonic source, a light source, an acousto-optic catalyst adding port and an acousto-optic catalyst intercepting and recycling channel are arranged in the device; and a reaction tank is connected with a water inlet channel, a water outlet channel and a blow-off pipe. A main body part of the device is composed of an acousto-optic catalytic reactor and a secondary cross-flow filtration reaction membrane; (1) the acousto-optic catalytic reactor achieves the purpose of acousto-optic catalytic degradation of pollutants; (2) ultrasonic transducers of the adopted ultrasonic field are divided into two groups, the adopted ultrasonic field is a double-frequency ultrasonic field, the purpose of adopting double frequencies is to enable sound waves to generate the superposition phenomenon, vibrationwaves with larger amplitude are generated in the sound wave diffusion process, and the increase of the number and types of cavitation bubbles is promoted; and (3) the concentration polarization of themembrane filtration material is reduced through cross-flow filtration, the membrane operation time is prolonged, and meanwhile, the catalyst is retained in the reactor through membrane filtration, sothat the loss of the catalyst is avoided.

The present invention discloses maca fruit and vegetable drink and a preparation method thereof, and belongs to the technical filed of fruit and vegetable drink processing. The provided maca fruit and vegetable drink contains 30 parts of maca extract solution, 40 parts of apple juice, 20 parts of tomato juice, 8 parts of white granulated sugar, 0.18 part of citric acid, 0.08 part of essence and 1.74 parts of pure water. A pH of the drink is 3.2-3.4. At the same time, the present invention also provides a maca fruit and vegetable drink preparation method. The provided method uses a dual-frequency ultrasound alternately enhanced supercritical fluid extraction technology to extract the active ingredients in the maca, the drink is high in extraction rate, the nutrients are not easily be damaged, and the drink is high in purity, free of solvent residues, free of pollutions, etc.

The invention relates to a method for extracting Chinese fevervine herb volatile oil. The method is characterized by comprising the following steps: uniformly mixing and homogenizing rhizome of Chinese fevervine herb and a 60-70 percent ethanol solution of which the weight is 1-2 times that of medicinal materials in a homogenizer, and extracting for 10-15 minutes; adding 3-4 times of 60-70 percent ethanol after homogenizing, extracting by adopting dual-frequency ultrasonic waves at the ultrasonic power of 400-600W, continuously extracting at the temperature of 60-70 DEG C for 90-120 minutes, filtering, and concentrating the filtrate until alcohol taste is eliminated; and extracting the concentrated solution for 2-3 times by using an organic solvent, merging the extracting solutions, drying through anhydrous sodium sulfate, performing vacuum concentration, and obtaining the Chinese fevervine herb volatile oil. The method is simple in operation, short in extraction time and high in yield and is suitable for industrial production.