113results about How to "The signal is stable and reliable" patented technology

The invention discloses a device and a method for detecting attention focusing degree based on the analysis of heart rate variability, mainly solving the problems of large interference and inconvenient testing of reference signals for attention judgment in the prior art. The method comprises the following testing steps: acquiring original electrocardiographic digital signals according to a MV5 lead mode; filtering the interference in the original electrocardiographic digital signals, extracting the position of a R wave and calculating heart rate variability signals; integrating and segmentingthe heart rate variability signals; performing empirical mode decomposition on each segment of the heart rate variability signals; calculating the approximate entropy of the heart rate variability signals and intrinsic mode function component signals; training a neutral network by using the calculated approximate entropy as an input vector of a reverse transmit neural network algorithm, and determining the parameters of codes of a neutral network; and detecting the attention focusing degree of a subject by utilizing the trained neutral network and outputting the test result. The invention hasthe advantages of large reference signal strength, convenient test and high accuracy, and is used for testing the attention focusing degree of a human body.

Since it is difficult to emit a stable and reliable modulated lightwave signal by means of IQ modulators used for QAM format, a method for controlling an optical transmitter according to an exemplary aspect of the invention includes the steps of (a) keeping an optical amplitude of a continuous wave light output from the optical transmitter constant, (b) making operating point values in optical modulation converge to predetermined values during step (a), and (c) modulating the continuous wave light with multiple amplitudes and phase levels around the operating point values converged in step (b).

A switch-driving circuit suitable for driving a full-controlled power switch combination is disclosed. The switch-driving circuit includes a first pulse-width modulator, a high-voltage isolation pulse transformer module and a plurality of output modules. The high-voltage isolation pulse transformer module includes a magnetic core connected to multiple output modules in a one-to-many way, or includes multiple magnetic cores connected to multiple output modules in a one-to-one way. Each output module includes a second pulse-width modulator and a driving-power amplifier. The full-controlled power switch combination includes a plurality of full-controlled power switches. The driving-power amplifier is coupled between the second pulse-width modulator and one of the full-controlled power switches.

The invention relates to hydraulic turbine governor out-of-control signal diagnosis and control methods. The diagnosis method is mainly based on electrical feedback signals acquired by a measuring unit of a hydraulic turbine governor; when the governor receives a command for opening or closing a guide vane, a difference value exists between control output, namely a target value that the guide vane needs to reach, and actual guide vane opening, and the difference value is higher than a set dead zone value; on normal conditions, a main distributing valve of the governor is controlled by PID (proportion integration differentiation) computation of a PLC (programmable logic controller) to be opened towards a target direction by a certain opening, and the guide vane is controlled to move towards the target direction; then periodical scanning is performed through a PLC program to read whether the opening of the guide vane moves towards the target direction or not and judge whether a movement speed meets the requirement for governing computation on-off time or not, and if a change value, read within a certain delay time, of the guide vane opening does not reach a change rate towards the target direction, the governor is judged to be out of control, and safety of a generator set is protected.

The invention discloses an analysis device based on an electrochemical luminescence technology and double-pole electrode configuration. The analysis device comprises a mini-type dark room for storing a reaction reagent and having a reaction and a liquid storage tank for storing detection objects and having an oxidization-reduction reaction, wherein a double-pole electrode and an electric signal applying unit are arranged between the mini-type dark room and the liquid storage tank respectively; one end of the double-pole electrode is packaged in an inner cavity at the bottom of the mini-type dark room and the other end of the double-pole electrode stretches into the liquid storage tank; and meanwhile, a positive pole of the electric signal applying unit stretches into the liquid storage tank through a driving electrode and a negative pole of the electric signal applying unit is connected with the top of the mini-type dark room through a driving electrode. According to the analysis device based on the electrochemical luminescence technology and the double-pole electrode configuration, the stored detection objects are linked with signal molecules, so that the oxidization-reduction reaction in the liquid storage tank is transmitted into the mini-type dark room in an electron form, a light signal is generated and a corresponding electrochemical luminescence signal is realized, so that the sensitivity and reliability of detection are extremely improved.

The invention discloses a bi-directional wireless intelligent door magnetic detector. The bi-directional wireless intelligent door magnetic detector comprises a cylinder and door magnetic switch combination body, a wireless door magnetic sensor and a door magnetic alarm, wherein the wireless door magnetic sensor comprises a door magnetic sensor, door closing and opening circuits, a power module, an MCU (microprogrammed control unit), a voltage-stabilizing and filtering circuit, a Wi-Fi (wireless fidelity) module power supply control circuit, a clock circuit and a low-voltage detection circuit; an input end of the door magnetic sensor is divided into two paths, one path is electrically connected with the door closing circuit and the clock circuit, and the other path is electrically connected with the door opening circuit and the MCU through the voltage-stabilizing and filtering circuit; the voltage-stabilizing and filtering circuit and the MCU form a closed loop through the Wi-Fi module power supply control circuit and a Wi-Fi module; an output end of the door magnetic sensor is electrically connected with the MCU through the door closing circuit and the door opening circuit. The bi-directional wireless intelligent door magnetic detector solves the problems that a detector in the prior art is high in cost, large in size, complicated in circuit and high in power consumption and a battery can only support the detector for a few days, can detect the opening and closing states of doors, windows and drawers, and has the advantages of low power consumption, low cost and small size.

The invention relates to a detecting device for positive and negative surfaces of a valve seat ring. The detecting device comprises a vertical main bracket, wherein the upper part of the main bracket is fixed together with a cylinder barrel of an air cylinder; a piston rod of the air cylinder faces upwards and is fixedly connected with the right end of a bracket I; a detection rod penetrates through a longitudinal seam in the left end part of the bracket I; a detection head is arranged at the lower end of the detection rod; a spring in a compression state sleeves the detection rod between the detection head and the bracket I; a limiting gasket is fixed at the upper part of the detection rod; a clamping block fixed on the detection rod is arranged above the limiting gasket; a limiting slot which penetrates in the front-rear direction is formed in the right end of the clamping block; a bracket II is fixed on the middle part of the bracket I; a pin II in the front-rear direction is arranged at the left end of the bracket II; the pin II is rotationally connected with a light shielding plate; a pin I penetrates through the limiting slot and the left end part of the light shielding plate in the front-rear direction; a photoelectric switch is arranged at the right end of a bracket II; the right end of the light shielding plate is provided with a light through slot corresponding to the photoelectric switch. According to the scheme, the invention provides the detecting device, which adopts a mechanical contact mode and is high in reliability, for positive and negative surfaces of the valve seat ring.

The invention discloses a road slope real-time estimation method for an automobile, which aims to solve the shortcomings of the prior art, such as many quantities of calibration, heavy influence of automobile acceleration and deceleration, large use of sensors, high cost, much dependence on automobile parameters, complex models and poor robustness. The real-time estimation method comprises the following steps: 1, initializing signal, initializing sensors after each power supply, and correcting the original errors of data; 2, pre-processing input signal, including 1) threshold limit, 2) slope limit, 3) low-pass filtering and 4) sliding average filtering; 3, correcting longitudinal acceleration signal; 4, based on Kalman filtering algorithm, calculating the parameters needed for weighted fusion and conducting data fusion by determining the reliable degree of acceleration signals and the situation of the automobile going up and down slope; and 5, correcting the slope and outputting the optimal estimate of the road slope.

The invention discloses a gear indicator of a commercial vehicle transmission. The gear indicator comprises an engine speed sensor, a transmission output shaft speed sensor, an operating lever front-rear position sensor, a gear display controller and a multi-functional instrument or an external LED display screen, wherein the gear display controller integrates the speed ratio, the operating lever gear position, the clutch switch signal, the neutral gear switch signal, the reverse gear switch signal and the operating level position switch signals for logical gear judgement, so as to judge the current gear state of a vehicle. The gear indicator disclosed by the invention has the advantages that through calculation and analysis of the relative speed ratio of the engine speed to the transmission shaft speed as well as the preset gear coefficient, the gear information can be precisely obtained; the structure of the commercial vehicle transmission is unchanged; and through addition of the gear display controller as well as a corresponding route, a gear position inductive switch, and the LED display screen, the vehicle equipped with any one transmission can have the abilities for modification and display of detailed gears.

The invention discloses an information source cell backup method which comprises the following steps: (1) backing up a system; (2) setting a switching judgment power threshold and a switching time length threshold when the output power of a radio frequency remote unit is lower than the switching judgment power threshold; and (3) selecting the link switching way, and performing radio frequency switching between a main information source radio frequency remote system and a backup information source radio frequency remote system according to the selected link switching way, wherein the link switching way comprises the automatic mode, the manual mode and the forced manual mode. The invention further discloses an information source cell backup system which comprises the main information source radio frequency remote system, the backup information source radio frequency remote system and a radio frequency switching unit. The automatic switching between the main radio frequency remote system and the backup radio frequency remote system is realized; and compared with the prior art, the method and the system have the advantages of flexible control way and convenience in use.

The invention discloses a polar fast electron measurement probe system suitable for magnetic confinement plasma. The polar fast electron measurement probe system comprises an insulating shell, fast electron probe assemblies, a Langmuir probe assembly, a ceramic base and a graphite shell. The insulating shell is made of high-temperature-resistant boron nitride, and the ceramic base is made of machinable ceramic. The probe assembly comprises a graphite probe, a copper binding post, a wire and other components, the graphite probe is in threaded connection with the copper binding post, and the copper binding post is in tin soldering connection with the wire or is in press connection with the wire through crimping pliers. The fast electron probes are uniformly and symmetrically distributed in the polar direction, and fast electron components from different directions can be measured. The graphite probes of the fast electron probes are located in the small holes and are applied with positivebias voltage. The radius of the electron Larmor in the magnetic confinement plasma is far less than that of ions, the ions can be effectively repelled by setting the diameter and the depth of the small hole so as to collect electrons. The system can work in the high-temperature environment in the magnetic confinement fusion device, and is stable in mechanical performance, reliable in signal, highin spatial resolution and small in occupied space.

The invention relates to a urea hydrolysis reactor control method based on the heat feed-forward signals, which comprises the steps of 1) acquiring a transfer function from a hydrolysis rector load to heating steam consumption; 2) generating a path of heating steam consumption signals through the transfer function by a hydrolysis rector load instruction, and converting the heating steam consumption signals into corresponding first heating steam governing valve openness signals; 3) generating second heating steam governing valve openness signals through a governing valve openness control function by a hydrolysis rector pressure deviation signals, and acquiring a deviation value; 4) leading the first heating steam governing valve openness signals into heating steam governing valve openness automatic control logic to act as feed-forward signals, and determining an openness reference value; and 5) weighing the heating steam governing valve openness reference value and the deviation value, outputting the weighed heating steam governing valve openness reference value and the weighed deviation value so as to acquire heating steam governing valve openness signals under variable load conditions. The control system provided by the invention comprises a PLC (programmable logic controller) which is used for receiving the hydrolysis reactor load instruction, a hydrolysis reactor pressure set value and measurement signals.

The present invention discloses an auxiliary contact device for medium voltage switching apparatuses comprising a fixed contact sub-assembly comprising at least a pair of fixed contacts, a movable contact sub-assembly comprising at least a movable contact that is rotatably connected with said fixed contacts, an operating shaft comprising a first shaft portion, operatively coupled with a linear actuator, and a second shaft portion, operatively coupled with said movable contact sub-assembly. The first and second shaft portions of said shaft are coupled each other and move linearly together between a first position and a second position. The second shaft portion of said shaft is free to rotate with respect to said first shaft portion, between a third and fourth position.

The invention relates to a universal tube cleaner indicator and belongs to the field of petroleum and gas pipeline mechanical equipment. The universal tube cleaner indicator comprises a trigger component, a transmission component, and an indication component; the upper end of the trigger component is provided with a trigger magnet, and the lower end of the trigger component is provided with a contact which is a universal trigger switch; a first compression spring is sleeved on the trigger magnet; the transmission component comprises a transmission rod and a transmission magnet fixed at the lower end of the transmission rod; the polarities of opposite ends of the transmission magnet and the trigger magnet are the same; and the indication component is connected with the transmission rod. When a tube cleaner or a tube cleaning ball passes through the contact, the contact rises or inclines to drive the trigger magnet of the trigger component to rise; and under the action of magnetic force, the transmission magnet rises to drive the transmission rod to rise. A magnetic force principle is adopted; the universal tube cleaner indicator has the advantages of simple structure, reliable and accurate signal, and convenience in installation, and cannot be worn easily; and the problem of influence on installation directions can be avoided.