43results about How to "Meet various needs in practical applications" patented technology

The invention discloses a total-station spatial measuring and positioning method based on optoelectronic scanning and ultrasound distance measurement and belongs to the technical field of big-size three-dimensional coordinate measurement in the industrial scene. The method comprises the following steps that a lunching base station and a receiver are built; the position of an ultrasound lunching module on the lunching base station is calibrated; the positions of a first ultrasound receiving module and a second ultrasound receiving module on the receiver are calibrated; the horizontal angle alpha and the pitch angle beta of a photodiode are measured with a photoelectric scanning method; through an ultrasound distance measurement method, the distance between the first ultrasound receiving module and the ultrasound lunching module and the distance between the second ultrasound receiving module and the ultrasound lunching module are measured; and the space coordinate of the photodiode is calculated. According to the total-station spatial measuring and positioning method based on optoelectronic scanning and ultrasound distance measurement, the total-station spatial measuring and positioning is realized only by a single lunching base station under certain specific working environment, the measurement principle is simple, and various requirements in the practical application are satisfied.

The invention discloses a multi-nozzle 3D spray-head, a printing method and a 3D printer. According to the method, a spray-head and a printing platform are adopted for printing, a plurality of nozzles are arranged on the spray-head, the spray-head comprises a spray-head seat and nozzle seats, the spray-head carries out 3D printing on the printing platform, the nozzles carry out relative motions in the x, y, z directions on the printing platform, and through the rotation of the nozzle seats or the spray-head seat relative to the printing platform respectively, at least two nozzles are enabled to move along corresponding printing paths respectively. By adopting the method provided by the invention for printing, the printing efficiency of the printer can be effectively improved, not only the printing of a printing path with small curve radius is facilitated, but also the rotational angles of the nozzle seats are reduced, the speed of the multiply nozzles following various curvature printing paths is increased, the load of a nozzle seat driving device or a driving device for the rotation of the printing platform is reduced, and various requirements in actual application are met.

The invention discloses a multi-modal brain-computer interface (BCI) method and system based on synchronic compound limb imaginary movements. The method comprises the following steps: designing seven types of multi-limb participated synchronic compound limb imaginary movements related to hands, feet and a body; irritating a subject by adopting task models of four stages, collecting electroencephalogram data and carrying out preprocessing; carrying out feature extraction and mode recognition on the preprocessed electroencephalogram data by three different cospace mode algorithms, so as to acquire an electroencephalogram feature vector of a single task; inputting the electroencephalogram feature vector of the single task into a training classifier of a support vector machine, and then predicting a spatial feature from a test set. The invention establishes a novel multi-modal BIC pattern based on the synchronic compound limb imaginary movements, the dilemmas that the species of the existing imaginary movement patterns are limited and disaccord with actual movements are got rid of, big instruction set output of information controlled by an MI (Motor imagery)-BCI system is realized, furthermore, a novel pathway is explored and a novel method is provided for promoting the practical application of a brain-computer interface in rehabilitation engineering.

The invention discloses a wireless temperature control system, and relates to the field of temperature detection. The wireless temperature control system collects temperature in a granary and other places through a receiving end and a transmitting end, realizes accurate collection of the temperature through an electric signal amplification circuit, a digital signal amplitude modulator circuit, a transmission tuning circuit, a first CPU control unit, a second CPU control unit and the like, and also can display the detected temperature in real time through a digital display tube. When a user finds that the detected temperature is not within a standard working range, the user can regulate the temperature of the granary and the other places in time so as to avoid over-wet or over-dry or other conditions. The wireless temperature control system improves temperature detection accuracy, saves manpower, reduces cost, and meets various requirements in practical application.

The invention discloses a bipolar orthogonal square wave modulated one-way synchronous acquiring device and a bipolar orthogonal square wave modulated one-way synchronous acquiring method for multiple channels of signals. The acquiring device acquires N channels of signals via an analog-to-digital converter; orthogonal square waves control switching-on and switching-off of at least two switch circuits; at least two channels of measured signals pass through a switch circuit; the switch circuit consists of an analog switch, a resistor and an operational amplifier; bipolar orthogonal square wave amplitude modulation is implemented via the switch circuit; after the amplitude of signals is modulated, the signals with different frequencies are added together via an additive operation circuit; and the one-way analog-to-digital converter performs analog-to-digital conversion to obtain digital signals. Multiple channels of measured signals can be acquired synchronously by the one-way analog-to-digital converter. The bipolar orthogonal square wave modulated one-way synchronous acquiring device has the advantages of simple circuits, low cost and high measurement accuracy.

The invention discloses an external modulation optical fiber interference fringe projection real-time three-dimensional shape measuring system. The system is based on optical fiber interference fringe projection, large modulation degree sine phase modulation and synchronization integration high-accuracy phase contour measuring, and meanwhile optical fiber end face Fresnel reflection interference signals are used for processing and solving interference signals which are fed back to a piezoelectric ceramic control circuit, and measuring accuracy is improved. Structure is simple, and achieving is easy. The whole system is of a closed-loop structure, anti-jamming capability is strong, real-time measuring and motoring capacity is achieved, the system improves control effect on piezoelectric ceramics through a high-voltage processing circuit, and various requirements in practical application are met.

The invention discloses a multi-dimension subcarrier index activated high-spectral-efficiency multi-carrier modulation method, comprising the following steps of dividing bit information needing to betransmitted into real part index bits and imaginary part index bits, and mapping the real part index bits and the imaginary part index bits into corresponding constellation points according to a constellation diagram; at a transmitting end, taking former P<1> bits as the real part index bits, selecting k<q> subcarriers from n<q> subcarriers for real part activation, taking the latter P <2> bits asthe imaginary part index bits, and selecting the k<q> subcarriers from the n<q> subcarriers for imaginary part activation; carrying out constellation mapping on the rest P<3> bits and loading the P<3> bits on the real parts and the imaginary parts of the k<q> selected subcarriers; and at a receiving end, removing cyclic prefixes from received signals, monitoring activation states of demodulated signal real parts and imaginary parts, restoring the former P<1> bits and the latter P<2> bits, and restoring original information bits through constellation diagram inverse mapping based on the k<q> activated subcarriers.

The invention discloses a device for detecting a small defect of a pipeline and a method for detecting a center and a diameter of the defect. Hall elements and magnets are mounted on a detector in thepipeline, wherein each Hall element is equipped with three pin slots for respectively placing three own base pins; circular holes in an inner wall of the detector in the pipeline are used for the placement of the magnets; the Hall elements are vertically inserted into the three pin slots; the Hall elements in the pin slots are mounted in parallel with the magnets in the circular holes; a distancebetween the Hall element and the magnet should be greater than 2 mm; the magnets can magnetize a pipe wall; when the detector in the pipeline passes through the small defect of the pipeline, the relative magnetic permeability of the small defect of the pipeline is large, a line of magnetic force near the small defect of the pipeline bends, a magnetic field signal induced by each Hall element is amagnetic field characteristic signal; the magnetic field characteristic signal is identified to identify a situation of the defect of the pipeline, locate a position of the defect of the pipeline andperform pipeline maintenance. Moreover, the method provided by the invention further detects the center and the diameter of the small defect of the pipeline to improve precision of detecting the small defect of the pipeline.

The invention discloses a multi-path signal unipolar square wave modulated single-path synchronous collection device and method. The collection device collects N paths of signals by a single-path analog-digital converter, and specifically comprises that the connection and disconnection of at least two switch circuits are controlled by square waves, at least two paths of measured signals pass through a switch circuit consisting of an analogue switch and a resistor, and the switch circuit achieves chopping amplitude modulation; the signals with different frequencies after amplitude modulation are added by an add operation circuit, and then subjected to the analog-digital conversion of the single-path analog-digital converter to obtain a digital signal; the multi-path signal unipolar square wave modulated single-path synchronous collection device and method achieve that the multi-path measured signals are synchronously collected by the single-path analog-digital converter, and has the characteristics of being simple in circuit, low in cost and accurate in measurement.