47results about How to "Low detection environment requirements" patented technology

The invention provides a multifunctional rotation device used for carrying out machine vision shooting. The device comprises a supporting foundation, a motor I, a motor mounting seat, a motor shaft coupling, a rotating shaft, a motor II, a camera supporting rack, a tray shaft coupling, a bearing tray, a camera fixing rack and a camera, wherein the motor I is fixed through the supporting foundation, the motor I is connected with the rotating shaft through the motor shaft coupling to drive the bearing tray to rotate, the bearing tray is connected with the rotating shaft through the tray shaft coupling, the motor I and the motor II are fixedly connected through the motor mounting seat, the motor II is connected with the camera supporting rack, and the camera is connected with the supporting rack through the fixing rack. When the camera is required to rotate 360 DEG to shoot a fixed to-be-shot object, the to-be-shot object is arranged on the bearing tray, the camera supporting rack is driven by the motor II to rotate, and the camera shoots after rotating a certain angle; when the camera is required not to move, the to-be-shot object rotates 360 DEG for shooting, the to-be-shot object on the bearing tray is driven by the motor I through an output rotating shaft to rotate, and the camera shots whenever the to-be-shot object rotates a certain angle. The device is advantaged in that through machine vision multi-angle rotating shooting and scanning, object surface quality detection and three-dimensional surface contour reconstruction are realized.

The invention belongs to the technical field of detection and relates to a portable arginine detection device and method. An AuNPs/CQDs fluorescent probe is fixed to filter paper, a paper-based nanometer fluorescent sensor is prepared, a laser in the length of 420 nm is adopted as an excitation wavelength standard in a dark room, and fluorescent signals on the paper-based sensor are directly readby an image collecting device; a fluorescence detection application in the image collecting device is adopted for converting chrominance components of fluorescent images into grayscale components on the basis of a grayscale model, then data processing is carried out, fitting of a grayscale-concentration fitting curve is achieved, and arginine is detected quickly, sensitively and conveniently. Therequirement for a demanded detection environment is low, and detection can be completed at the room temperature without other additional conditions. The portable arginine detection method is high in repeatability, does not require operation of correlated professional staff and can better meet the demands of the market and companies.

The invention relates to a micro-fluidic chip, a nucleic acid detection instrument and a nucleic acid detection method, wherein the micro-fluidic chip comprises a chip main body, an extracting unit, aquantitating unit and an amplification unit, wherein the chip main body is provided with a distal end and a proximal end; the chip main body can rotate around a rotating center near the proximal endthrough being driven by a rotating device; the extracting unit, the quantitating unit and the amplification unit are respectively arranged at the chip main body; the quantitating unit communicates with the extracting unit; the amplification unit is positioned between the quantitating unit and the distal end; and the amplification unit communicates with the quantitating unit. The micro-fluidic chip, the nucleic acid detection instrument and the nucleic acid detection method have the advantages that the operation links of a nucleic acid reagent are reduced; the nucleic acid detection time is shortened; and the effective proceeding of the nucleic acid detection process is ensured.

The invention discloses a method for fault analysis and location of thyristor controlled reactor of static var compensator,which comprises the step of identifying and locating a fault source gradually by analyzing and calculating the waveform recorded during the fault period,analyzing the abnormalities of the bus line voltage to distinguish the internal fault from the external fault, distinguishing the main link fault or other link/equipment faults in the control system by analyzing whether the three-phase current is abnormal at the same time, and calculating the third-harmonic component in the current to distinguish thyristor valve block control failure from reactor failure. The invention analyzes and locates the fault source of the static var compensator rapidly without relying on laboratory detection or fault simulation, and has the advantages of simplified fault analysis, shortened outage time, improved efficiency, reduced cost and wide application range.

The invention relates to a CFRP porosity ultrasonic characterization method based on ultrasonic backscattered signal recurrence quantification analysis, and belongs to the technical field of nondestructive detection. The method comprises the steps that an ultrasonic signal collecting system composed of an ultrasonic flaw detector, a delay block probe and a digital oscilloscope is adopted, an ultrasonic backscattered signal is collected, and phase-space reconstruction is conducted on the ultrasonic backscattered signal. Distance between every two time vectors in a phase space is calculated, a reference threshold value is set, a two-dimensional recursive matrix is obtained, and the two-dimensional recursive matrix is visualized to obtain a Recurrence Plot (RP). An RP graph is subjected to quantitative calculation through RQA quantitative index Recurrence Rate (RR), the correlation between the CFRP porosity P and RR is established finally, RR=aP-1, and characterization of the porosity is achieved. Compared with an ultrasonic attenuation method, the limitation that when a bottom echo does not exist or is weak, the porosity cannot be characterized is overcome through the method, and a good popularization prospect is achieved.

The invention provides a contact type micro-displacement detection device which comprises a hollow shell. A measuring rod is transversely arranged in the shell, the left end of the measuring rod penetrates out of the shell, the upper side and the lower side of the measuring rod are sequentially provided with magnetic control elastomers, piezoelectric patches and U-shaped mounting grooves from inside to outside, and the two U-shaped mounting grooves are arranged back to back, and cavities used for containing the first permanent magnet and the second permanent magnet are formed respectively with the upper inner side wall and the lower inner side wall of the shell, the two piezoelectric patches are connected with leads, a directional plate is fixedly arranged on the right side in the shell, the right end of the measuring rod penetrates through the directional plate and is freely suspended, and a cushion block is arranged on the right inner side wall of the shell. Guide rings are arranged on the left side wall of the shell and the directional plate, a left push plate is fixedly connected to the left side of the measuring rod, a right push plate is fixedly connected to the right side of the measuring rod, a left elastic reset mechanism is connected between the left push plate and the left side wall, and a right elastic reset mechanism is connected between the right push plate and the directional plate. Tiny displacement generated by an object can be accurately detected.

The invention belongs to the technical field of nucleic acid testing, and particularly relates to an instrument-free and power-free rapid on-site nucleic acid testing product. The product comprises a nucleic acid testing module and a temperature control module for providing a nucleic acid testing reaction temperature environment, and is characterized in that the temperature control module includes an air-touch self-heating substance and a ventilation structure; and the temperature control module introduces external air through the ventilation structure during testing. The invention provides the instrument-free and power-free rapid on-site nucleic acid testing product which is simple and convenient to operate, does not depend on large or expensive instruments, is power-free and relatively low in cost, so that nucleic acid testing is realized truly anytime and anywhere, and the application scene of nucleic acid testing is greatly extended.

The invention discloses a system and a method for detecting the out-of-band rejection capability of an ultraviolet imager. The detection system comprises a light source, an integrating sphere, an optical power meter and a calculation control system, wherein the integrating sphere is provided with a light inlet and two light outlets, the light inlet is connected with the light source, one light outlet is used for being connected with equipment to be tested, and the other light outlet is connected with the optical power meter; the calculation control system comprises a light source control unit,an optical power meter data acquisition, processing and display unit and a verification processing unit. And the verification processing unit is used for evaluating the out-of-band rejection capability of the to-be-tested equipment by analyzing the photon number of the to-be-tested equipment and the data of the optical power meter and selecting a photon number evaluation standard. The detection system is simple in structure, low in detection environment requirement, low in detection personnel requirement and convenient to widely popularize and apply.

The invention belongs to the technical field of detection of train cracks and relates to a train crack detection device. The train crack detection device comprises a fixed barrel which is provided with a rack, a gear meshed with the rack is arranged below the rack and connected with a first motor, and a baffle is arranged in the fixed barrel and divides the fixed barrel into a first chamber and asecond chamber; a second motor is arranged in the second chamber and fixed to the baffle, and an output shaft of the second motor is connected with a rotating disc; a rotating groove is formed in thefixed barrel in the circumferential direction of the fixed barrel, the rotating disc is located in the rotating groove and can be rotated along the rotating groove, a rotating barrel is fixed to the rotating disc, the end of the rotating barrel penetrates through the fixed barrel and then is provided with a fixing port, and a fixed assembly is fixed in the fixing port; an eddy current sensor is arranged in the rotating barrel and comprises a probe, and the probe is fixed in the fixed assembly; a camera is arranged at the end of the rotating barrel. The labor intensity is low during detection of a hollow shaft of a train, the detection efficiency is high, and the requirements for a detection environment are low.

The invention belongs to the field of nano functional materials, and discloses formaldehyde detection test paper based on nano-composite fibers and a preparation method and application thereof, and the preparation method comprises the following steps: (1) adding hydrophilic vapor-phase silicon dioxide into a solvent, and carrying out ultrasonic oscillation dispersion; (2) dissolving polyacrylonitrile in the mixed solution in the step (1), and performing stirring to obtain a polymer solution of polyacrylonitrile and SiO2; (3) performing electrostatic spinning on the polymer solution obtained in the step (2) to prepare composite fiber paper; and (4) dipping the composite fiber paper in a color developing treatment solution to obtain the formaldehyde detection test paper, wherein the developing treatment liquid contains a compound containing a hydroxylamine functional group and a derivative of the compound. The test paper provided by the invention has the advantages of visual color change, high selectivity, good stability, portability, normal use under low humidity, lower detection limit than the same type of test paper, and color change with a certain rule along with the increase of concentration; production equipment is simple and easy to operate, and used raw materials and other reagents are low in cost.

The invention discloses a 3D printer planar motion precision measuring device. The 3D printer planar motion precision measuring device comprises a base, an X-direction guide rail, a Y-direction guide rail, an X-direction sliding plate, a Y-direction sliding block, a Y-direction grating reading head, a Y-direction grating scale, an X-direction grating scale, a data processing system, and an X-direction grating reading head. The 3D printer planar motion precision measuring device is advantageous in that a structure is simple, use is convenient, and production costs are low; during use, requirements on testing environment are low, and the 3D printer planar motion precision measuring device can be used in a production scene for measurement; during actual measurement, the data processing system is used for real-time acquisition of position numbers from the X-direction grating reading head and the Y-direction grating reading head, and the CPU is used for the real-time processing of the acquired data, and is used to output actual motion coordinate data including X-direction positions and Y-direction positions to related data communication interfaces; during the phase, the CPU is used to form a dynamic motion curve chart by the fitting of the actual motion coordinate data, and is used to display the dynamic motion curve chart visually by a display screen, and then a user can be aware of an actual measurement result conveniently.