66results about How to "Guaranteed Acquisition Accuracy" patented technology

The invention discloses a heart sound signal acquisition, conditioning and transmitting device. A heart sound sensor converts continuously variable heart sound signals of a human body into heart sound electrical signals; the heart sound electrical signals are subjected to controllable gain differential amplification and then transmitted to a filter part; a filter carries out reasonable low pass filtration, power frequency wave trapping and the like according to the frequency characteristics of the heart sound signals to reduce noise interference; the filtered bipolar heart sound analog signals are subjected to level lifting and analog-digital conversion; and a serial port transmission module is connected with an upper computer and used for receiving commands of the upper computer and transmitting the acquired heart sound digital signals. The device can be used for conveniently, quickly and accurately acquiring and conditioning the hearth sound signals, two power supply schemes by mains supply and batteries can be adopted, and the device is applied to multiple heart sound acquisition occasions such as hospitals, households and accident sites.

The invention discloses a pigeon-racing-based pigeon real-time positioning system, which comprises a server, at least one positioner with a code and a display terminal, wherein the server is provided with a geographical information identification module and a database, which are in communication connection; the at least one positioner is in communication connection with the server respectively; the display terminal is in communication connection with the server, and is used for displaying and parameter setting; each positioner is arranged on a pigeon through a fixing device; the fixing device comprises a fixing part and a loading part, the fixing part is shaped into a ring for elastic sleeving connection, the loading part comprises a bag for elastically accommodating the positioner and an overturning cover arranged on the bag in a rotating covering manner, and one side, far away from rotating opening of the overturning cover, of the bag is fixedly arranged on the outer side of the ring of the fixing part. According to the pigeon-racing-based pigeon real-time positioning system, the ring-shaped fixing part elastically connected to the pigeon in a sleeving manner and the loading part for elastically accommodating the positioner are adopted, so that the system is applied to sleeving connection of pigeons with different sizes and fixation of positioners with different sizes, and the dropping rate is low.

The invention relates to an online restraining method for milling chatter. A data acquiring and processing module comprises a clamping plate arranged at the lower end of a machine tool main shaft, a first capacitance type displacement sensor, a second capacitance type displacement sensor, an acquirer and a data analyzer; the first capacitance type displacement sensor and the second capacitance type displacement sensor are symmetrically arranged at the lower end of the clamping plate, and are connected with the acquirer; and the acquirer is connected with the data analyzer. According to the online restraining method for milling chatter, a way of combining a controller with electromagnetic induction coils is adopted for inhibiting milling chatter, and magnetic field intensity is controlled through current size, so that damping of the whole process system is controlled, and complete closed-loop feedback is formed. The device is high in universality, and is conveniently mounted on different machine tool main shafts, so that a processing process is more stable, and processing precision is effectively guaranteed.

The invention provides an online water quality detection circuit. The online water quality detection circuit is characterized by comprising a power supply converter, and a microprocessor, a wireless transceiver, a TDS (Total Dissolved Solids) testing terminal and an RS232 serial port circuit connected with a service terminal, which are electrically connected with the power supply converter respectively, wherein the TDS testing terminal is used for sensing a TDS signal of water in a pipeline and outputting the TDS signal to the microprocessor; the microprocessor, which is used for carrying out calculation processing on the TDS signal, is used for controlling the RS232 serial port circuit to transmit a TDS value of water quality of the service terminal; and the wireless transceiver is used for wirelessly receiving or wirelessly transmitting a data signal and the wireless transceiver and the microprocessor are combined to carry out bidirectional transmission on data. A voltage signal value, which represents TDS quantity, of dynamic water in the pipeline is continuously collected in real time through the TDS testing terminal, and the voltage signal value is processed by the microprocessor to extract the TDS value of the obtained pipeline water; models of components are specifically selected and data acquisition, transmission and intelligent control are realized in one step; and the cost is reduced and the layout is optimized under the conditions that the acquisition precision and the response speed are ensured and the power consumption is reduced.

The invention provides an instrument for testing the transformation ratio and polarity of a capacitance type voltage transformer. The instrument comprises a high voltage output module and a voltage signal collection and calculation module; the high voltage output module comprises a primary step-up transformer and a high voltage output divider resistance unit in parallel connection, the high voltage output divider resistance unit comprises a large power high voltage resistor and three high precision wiring resistors, one end of the large power high voltage resistor is connected to the capacitance type voltage transformer, and the other end of the large power high voltage resistor is connected to the high precision wiring resistors in series; and the three high precision wiring resistors areconnected in parallel, one end of each high precision wiring resistor is grounded, and the other end of the high precision wiring resistor is connected in series with the large power high voltage resistor, and a high voltage dividing output end is led out. The instrument is researched to fill the blank of instrument specially used for transformation ratio and polarity test of the capacitance typevoltage transformer, and has the advantages of simple work, being safe and practical, high in working efficiency and anti-noise performance and low in cost.

The invention relates to the field of information acquisition and particularly relates to a capacity acquisition system for a die casting machine. The capacity acquisition system comprises a data acquiring device, a processing device, a remote control terminal, a communication device and an executing device, wherein the data acquiring device is used for acquiring each parameter of the die casting machine; the processing device is used for processing the acquired data; the remote control terminal is used for remote control; the communication device is used for communication between the processing device and the remote control terminal; the executing device is connected with the processing device so as to be remotely controlled by the remote control terminal; the data acquiring device comprises an acquisition card, a calibration module, a cache module, a displayer, keys and a power supply, wherein the acquisition card is connected with a die casting machine PLC (Programmable Logic Controller) and is used for acquiring all the data; the correction module is connected with the acquisition card and is used for calibration; the cache module is connected with the acquisition card and is used for data cache; the displayer is connected with the cache module and is used for displaying the acquired data in real time; the keys are connected with the acquisition card and are used for parameter setting; and the power supply is used for supplying power. The capacity acquisition system provided by the invention is high in data processing capacity, high in acquisition precision, high in timeliness, low in operating cost and convenient for large-scale popularization and application.

Disclosed is a battery testing fixture. The battery testing fixture comprises a bottom plate, a stand column fixed onto the bottom plate, and a fixing assembly, wherein the fixing assembly can move up and down relative to the stand column and be fixed onto the stand column through a connector for pressing a battery on the bottom plate and being electrically connected with the battery. By means of the fixing assembly which can slide relative to the stand column and can be fixed onto the stand column, the battery testing fixture is applicable to batteries in various sizes, thereby being flexible in application.

The invention belongs to the avionics technical field and especially discloses a precision correction circuit and method of a multichannel voltage signal collection circuit which is applied to a flight data collection system. An input end of a plurality of paths of analog switches in the multichannel voltage signal collection circuit is grounded, an another path is connected with a reference voltage source, the output voltage is a reference voltage Vref, and other input ends are respectively connected with signal sources to be collected. According to the invention, the voltage of a reference voltage source channel is collected at fixed establishing time, then after the data of each signal channel n is collected, the circuit is firstly switched to the grounded channel so as to discharge charges on a distributed capacity on a public channel, and then the circuit is switched to a next signal channel n+1 to carry out data collection, so that the sampling rate is improved, and the sampling precision of the signals is simultaneously improved.

The invention discloses an image analysis system for an ophthalmological anterior chamber angle anterior segment, and belongs to the field of image analysis. The image analysis system for the ophthalmological anterior chamber angle anterior segment includes a fixing plate, an outer shell is fixedly connected to the rear side of the upper surface of the fixing plate, a rotating plate is rotatably connected to the inner side surface of the outer shell, a center lens is fixedly installed at the inner center of the rotating plate, side lenses are fixedly installed to the outer side of the outer surface of the rotating plate, and the side lenses are uniformly distributed to the outer side surface of the center lens; and connecting rods are fixedly connected to two ends of the front side surfaceof the rotating plate, the outer surfaces of the connecting rods are slidingly connected to the surfaces of the two sides of the interior of the outer shell, the other end of each connecting rod is fixedly connected with an adjustment ring, and a friction rubber ring is fixedly adhered to the inner side surface of each adjustment ring. The convenience and stability during use can be greatly improved, and the accuracy and high efficiency can be ensured.

The invention discloses a battery charging control circuit comprising a single battery, multiple first probes, multiple second probes, a sampling and amplifying circuit, a control circuit and an alarmcircuit. The single battery comprises a positive electrode and a negative electrode. Multiple first probes are electrically interconnected and one end is electrically connected with the positive electrode of the single battery and the other end is connected with the sampling and amplifying circuit. Multiple second probes are electrically interconnected and one end is electrically connected with the negative electrode of the single battery and the other end is connected with the sampling and amplifying circuit. The other end of multiple first probes is also connected with a charging current input end, and the other end of multiple second probes is also connected with a charging current output end. The control circuit is connected with the sampling and amplifying circuit and the alarm circuit. The sampling and amplifying circuit is used for acquiring the charging voltage of the positive electrode of the single battery and the charging voltage of the negative electrode and amplifying thevoltage difference of the charging voltage of the positive electrode and the charging voltage of the negative electrode and then transmitting the voltage difference to the control circuit. When the voltage difference is greater than the preset voltage, the control circuit controls the alarm circuit to alarm.

The invention discloses a signal testing method and a system, electronic equipment and a storage medium. The signal test method comprises the following steps: sending a test instruction and generating a parameter configuration instruction; entering a signal test state according to the test instruction, and generating a test signal; processing the test signal according to the parameter configuration instruction, and generating test data; and collecting and processing the test data to obtain a test result. According to the embodiment of the invention, the test stability of the to-be-tested equipment can be ensured, so that the test efficiency of the to-be-tested equipment is improved.