65results about How to "Large signal amplitude" patented technology

A glassy metal alloy consists essentially of the formula FeaCobNicMdBeSifCg, where "M" is at least one member selected from the group consisting of molybdenum, chromium and manganese, "a-g" are in atom percent, "a" ranges from about 30 to about 45, "b" ranges from about 8 to about 18, "c" ranges from about 20 to about 45, "d" ranges from about 0 to about 3, "e" ranges from about 12 to about 20, "f" ranges from about 0 to about 5 and "g" ranges from about 0 to about 2. The alloy can be cast by rapid solidification into ribbon, cross-field annealed to enhance magnetic properties, and formed into a marker that is especially suited for use in magneto-mechanically actuated article surveillance systems. Advantageously, the marker is characterized by substantially linear magnetization response in the frequency regime wherein harmonic marker systems operate magnetically. Voltage amplitudes detected for the marker are high, and interference between surveillance systems based on mechanical resonance and harmonic re-radiance is virtually eliminated.

A glassy metal alloy consists essentially of the formula FeaCobNicMdBeSifCg, where "M" is at least one member selected from the group consisting of molybdenum, chromium and manganese, "a-g" are in atom percent, "a" ranges from about 19 to about 29, "b" ranges from about 16 to about 42, "c" ranges from about 20 to about 40, "d" ranges from about 0 to about 3, "e" ranges from about 10 to about 20, "f" ranges from about 0 to about 9 and "g" ranges from about 0 to about 3. The alloy can be cast by rapid solidification into ribbon, annealed to enhance magnetic properties, and formed into a marker that is especially suited for use in magneto-mechanically actuated article surveillance systems. Advantageously, the marker is characterized by substantially linear magnetization response to an applied magnetic field in the frequency regime wherein harmonic marker systems operate magnetically. Voltage amplitudes detected for the marker are high, and interference between surveillance systems based on mechanical resonance and harmonic re-radiance is virtually eliminated.

An output buffer is disclosed and includes a differential output buffer input configured for coupling to a differential output of an input circuit. The output buffer further includes an inductive voltage divider circuit coupled to the differential output buffer input, and configured to weaken a loading at the differential output of the input circuit.

The invention discloses a system for Young modulus measurement of a film. The system comprises a pulsed laser, wherein the pulsed laser emits pulse laser, which is divided into 7 / 10 pulse laser and 3 / 10 pulse laser by a 3:7 spectroscope after being collimated and broadened by a first beam expander, and the 7 / 10 pulse laser is focused on the surface of a sample under test through a cylinder focusing lens to generate an acoustic surface wave signal under excitation; and the acoustic surface wave signal is converted into an electrical signal through a first detection channel and / or a second detection channel, and the electrical signal is output to a computer for processing after being displayed by an oscillograph. The system not only has the advantages of large signal amplitude, high applicability in testing environment with large disturbance and the like of the piezoelectric laser acoustic surface wave detection technology, but also inherits the advantages of rapid, accurate and non-contact measurement and high signal to noise ratio and the like of the difference confocal laser acoustic surface wave detection technology; and the system has higher applicability and wider range of applicability. Meanwhile, based on the advantage of high measurement bandwidth of the difference confocal laser acoustic surface wave detection technology, the measurement resolution is greatly improved.

The invention relates to a ground nuclear magnetic resonance signal noise filtering method based on a model, which is mainly used for filtering the peak noise in a nuclear magnetic resonance signal. The method comprises the steps of firstly, collecting an MRS signal by using a nuclear magnetic resonance water detector, and removing the power frequency harmonics by using a harmonic modeling method;secondly, establishing a peak noise model through two second-order cascade band-pass filters, and meanwhile, positioning the position of the peak noise by adopting an NEO algorithm and intercepting corresponding data segments; and then, performing parameter extraction based on a least square method to obtain peak noise, aand finally, subtracting the MRS data from which the power frequency harmonic waves are removed from the peak noise obtained by modeling to obtain an MRS signal from which the peak noise is removed. According to the method, the problem of removing the peak noise in the MRS signal is solved, and compared with a traditional MRS peak signal denoising method, the method has the advantages of being high in practicability, obviously improving the working efficiency, improving the signal-to-noise ratio and the like.

An apparatus for wafer inspection is described, comprising an incident-light illumination device (5) having an illumination axis and an imaging device (9) having an image axis, both of which are inclined with respect to one another and are directed onto a region to be inspected of the surface (42) of a wafer (2). According to the present invention, the apparatus is characterized in that the incident-light illumination device (5) and the imaging device (9, 19) each have associated with them a polarizing means whose transmission axes are oriented at a predetermined angle to one another.

The invention discloses an RSSI (Received Signal Strength Indicator) circuit used for an OLT (Optical Line Terminal) optical module in a passive optical network. The RSSI circuit comprises an adjustable high-voltage generator and a mirror image circuit, wherein the output end of the adjustable high-voltage generator is connected with the input end of the mirror image circuit; the mirror image circuit is provided with two output channels, i.e. a main channel and a secondary channel; the main channel outputs current I1 to provide reversed operating bias voltage to an avalanche photodiode of the OLT; the secondary channel outputs mirror current I2 and is connected with a signal acquisition unit; and the signal acquisition unit collects highlight and weak light signals and transmits the signals to a singlechip. The RSSI circuit has the outstanding advantage that a processing circuit can obtain a signal amplitude which is big enough no matter the weak light or the hightlight is detected, thereby solving the problem of big dynamic detection of the RSSI of the OLT module in a PON (Passive Optical Network), and ensuring the detection precision of the RSSI of the OLT module in the whole optical power zone.

This invention relates to an induced polarization spectrum analysis method for acquiring penetration rate of rock. The characteristics are the following: to gather induced polarization weakening spectrum down-well and get induced polarization relax time spectrum through multiple index weakening match; then to calculate the geometric average and arithmetic average of relax time and ground penetration rate curve with materials of porosity logging and experiment constants. It is with low well logging cost, large signal range, high signal-to-noise ratio and long weakening time and high accuracy of polarization ratio measuring.

The invention discloses a method for separate imaging of water and fat based on inversion recovery technology, which includes the following steps of: determining a first inversion recovery time when the longitudinal magnetization component of hydrogen atomic nucleus in fat or water is zero; respectively selecting a second inversion recovery time and a third inversion time before and after the first inversion recovery time; during the second and the third inversion recovery time, respectively using a scanning sequence to excite a detected object and obtaining two images simultaneously including a pure water image and a pure fat image; synthesizing the two obtained images; and when the synthesis removes the pure fat image included in the two images, obtaining a pure water image, when the synthesis removes the pure water image included in the two images, obtaining a pure fat image. By the use of the invention, the pure water image and the pure fat image can be obtained at one time by using the scanning sequence to excite the detected object and the signal-to-noise ratio of the images is relatively high.

The invention discloses a position detecting device and a signal processing device and method thereof. The position detecting device comprises a rotor and a stator covering the rotor inside, wherein the rotor comprises a first magnetic steel ring and a second magnetic steel ring which are fixed on a rotation axis; n-numbered magnetic induction elements which are uniformly distributed and correspond to the second magnetic steel ring, and m-numbered magnetic induction elements which are distributed at a certain angle and correspond to the first magnetic steel ring are arranged on the stator; and when the rotor carries out rotational motion relative to the stator, the magnetic induction elements convert the sensed magnetic signals into voltage signals and output the voltage signals to the signal processing device. In the invention, the magnetic induction elements fixed on the circumference of the stator are utilized to induce magnetic filed intensity variation caused by rotation of the magnetic steel fixed on the axis to output the voltage signals, and the voltage value is used for judging the rotation angle of the axis, thus realizing position detection. The invention has the advantages of quick response, high processing precision, low cost, simple manufacturing process, etc.

The invention discloses an electromagnetic ultrasonic signal superposition method which comprises the following steps: sequentially providing pulse voltage strings with the same pulse width for multiple transmitting coils according to the scheduled time interval so as to generate multiple ultrasonic wave signals; receiving the echo signals of the multiple ultrasonic waves through multiple receiving coils; carrying out the phase shift on multiple voltage signals corresponding to the multiple received echo signals, thereby enabling the phases of the multiple voltage signals to be same; and superposing the multiple voltage signals subjected to phase shift. According to the electromagnetic ultrasonic flaw detection method provided by the invention, the echo signals of the ultrasonic waves which have the scheduled phase difference are subjected to phase shift and superposition; the echo signals are received by the multiple receiving coils; and the signal amplitude is increased, thereby improving the single to noise ratio.

In a super-resolution optical disk for the purpose of achieving an increase in the density of recording data by reproducing a recording mark smaller than optical resolution, the optimum reproduction power needs to be determined since the quality of a super-resolution reproduced signal strongly depends on the reproduction laser power. However, since the track error signal required for tracking servo also depends on the reproduction power, there is a need for a method for determining the reproduction power taking into account both the stabilization of tracking servo and a quality improvement of the reproduction signal. The reproduction power is changed under conditions with focusing servo applied but without application of tracking servo. Thereby, a cross track signal is detected to identify a reproduction power region that leads to quality improvement of both a reproduction signal and a track error signal.

The invention discloses an electromagnetic ultrasonic surface wave transducer and a design method thereof, and belongs to the technical field of electromagnetic ultrasonic. The invention aims at solving the problem of low efficiency of the existing electromagnetic ultrasonic surface wave transducer. According to the electromagnetic ultrasonic surface wave transducer, the size of a magnet and the structure of a coil are changed, and a zone with higher magnetic induction intensity and more horizontal components in a magnetic field is fully utilized, so that the working efficiency of the transducer is improved, and the amplitude of signals exciting surface waves is improved. Due to the complete design thought, the parameters of the magnet in the transducer do not need to be determined by multiple trials; and the efficiency of the transducer and the amplitude of the surface wave signals are further improved through the new structure of the zigzag coil. The invention can be widely applied to an electromagnetic ultrasonic device for detecting with the ultrasonic surface wave.

A system for processing information of electronic equipment include signal input circuit, a feedback regulating circuit and a regulated output circuit, the signal input circuit receives a data signalat an input end of a signal transmission channel for signal reception by a terminal controlled by an electronic equipment information processing system, the feedback regulating circuit receives the output signal of the signal input circuit in three paths.Within an noninverting input of an input op amp AR1, in a logarithmic circuit composed of a two-input op amp AR2 and a transistor Q2, three are in the noninverting input of transistor Q1 positive feedback input op amp AR2. At last, the voltage stabilizing output circuit adopts the voltage stabilize circuit composed of the transistor Q8 and thevoltage stabilizing tube D3 to output the voltage stabilized signal, which can improve the stability of the signal in the signal transmission channel for the signal receive by the electronic equipment information processing system control terminal, and can automatically adjust the signal waveform and prevent the signal distortion.

The invention discloses an alarm wristband and relates to an alarm device. The alarm wristband comprises a waterproof housing, and a voltage follower, a pulse sensor, a pulse signal amplifier, a signal amplitude amplifier and a display alarm circuit which are arranged in the housing, wherein the pulse sensor, the pulse signal amplifier, the signal amplitude amplifier and the display alarm circuit are sequentially connected; the voltage follower is connected between the pulse sensor and the signal amplitude amplifier; the pulse sensor comprises a storage battery used for supplying power for the circuit, a switch connected with the storage battery, a voltage stabilizer IC1 connected with the switch, and two current-limiting resistors (a resistor R1 and a resistor R2) connected with the output terminal of the voltage stabilizer IC1; and the resistor R1 is connected with an infrared transmitting tube LED 1, the resistor R2 is connected with a photoresistor R17, and the photoresistor R17 receives infrared rays emitted by the infrared transmitting tube LED 1.

The invention discloses a network monitoring method and device based on polling matching; modulation is carried out in links to be monitored by an adjustable light source, while a monitoring pulse sequence corresponding to the links to be monitored emerges, and states of the links to be monitored are recognized one by one through a command transmitted by a receiving processing and control unit; the network monitoring method enables branch fiber links in a passive optical network to be effectively monitored; the states of the branch fiber links are judged respectively at a receiving end through unique signal characteristics generated by matching of the monitoring pulse sequence and a terminal encoder; in addition, the network monitoring device has simple structure and enables system and user costs to be effectively reduced.

The invention discloses a ground fault line and type identification method and device based on an ultra-low frequency signal. The method comprises the steps: obtaining a zero-sequence voltage ultra-low frequency signal and a zero-sequence current ultra-low frequency signal of each line; selecting an absolute value of the peak value of the zero-sequence current ultralow-frequency signal as a representative value of a corresponding line; if the representative values are less than a current threshold value, determining that a single-phase earth fault does not occur, and otherwise, determining that the line with the maximum representative value is a faulty line; acquiring a zero-sequence voltage power frequency signal of the fault line so as to determine a fault angle; adaptively selecting anultra-low frequency characteristic frequency band based on the fault angle; calculating the ratio of the zero-sequence voltage signal energy to the zero-sequence current signal energy of the fault line in the characteristic frequency band, taking the ratio as the characteristic quantity for estimating the transition resistance, and determining the fault type based on the characteristic quantity. According to the invention, the line with the ground fault can be accurately identified, and the fault type can be identified on the basis of accurate line selection.

The invention discloses an annular shear type deflection electric acceleration sensor and a laminated structure acceleration sensor. The annular shear type deflection electric acceleration sensor comprises a support rod, output terminals, an annular mass block and an annular sensing module made of a deflection dielectric material; the inner ring and the outer ring of the annular sensing module areplated with a metal film; the inner ring of the annular sensing block is arranged at the upper end of the support rod; the inner ring of the annular mass block is fixed at the outer ring of the annular sensing block; and the metal films of the inner ring and the outer ring of the annular sensing block are connected with two output terminals respectively through wires. As the acceleration is measured by using a linear relationship between a strain gradient which is generated by the deflection dielectric material along the axial direction and electric charge which is generated based on the deflection electric effect under the action of a shearing stress generated by the annular mass block, measurement of vibration is accordingly realized.

The invention belongs to the technical field of satellite navigation, and discloses a B1C weak signal acquisition method, device and a computer storage medium. The method comprises steps: first satellite intermediate frequency data and second satellite intermediate frequency data are acquired, and by using the first satellite intermediate frequency data and the second satellite intermediate frequency data, sequential search is carried out under each Doppler frequency within a Doppler frequency search range; in the case of search, corresponding local carrier is firstly generated, the local carrier is used for carrier stripping, resampling is carried out according to a specified chip search interval, correlation is performed according to the resampled satellite data and a pseudorandom code corresponding to the current satellite, non-coherent accumulation of certain times is carried out on the basis of correlation until all frequencies in the Doppler frequency search range are searched, and whether capture is successful is judged according to a final result. The problem that B1C signals under a weak signal condition can not be captured in the prior art can be solved, the B1C signal capture sensitivity can be effectively improved, and the operation is simple and easy.

An optical position-measuring device for detecting the position of two objects movable relative to each other in at least one measuring direction includes a measuring standard which is joined to one of the two objects and possesses an incremental graduation extending in the measuring direction, as well as at least one reference marking at a reference position. The reference marking includes two reference-marking subfields disposed in mirror symmetry with respect to a reference-marking axis of symmetry, each of the subfields being made up of a structure extending in the measuring direction and having a locally changeable graduation period. In addition, the position-measuring device has a scanning unit which is joined to the other of the two objects and to which a scanning device is assigned that is used to generate at least one reference signal at the reference position. The scanning device includes at least one light source emitting divergently in the direction of the measuring standard, as well as a detector system having elements which are disposed along the measuring direction such that, starting from a central detector-system axis of symmetry in the measuring direction, the center-to-center distances between adjacent elements in the same direction change like the graduation periods of the structures in the reference-marking subfields starting from the reference-marking axis of symmetry.

The invention discloses an online frequency measurement system for quartz wafer polishing and grinding, comprising a DDS signal module, a radio frequency power amplification module, a phi network interface circuit module, an impedance matching module, a signal processing module, an MCU control system module and a power module for providing a working voltage for the above modules, wherein the DDS signal module generates a specified frequency range and a sweep frequency velocity according to a specified sweep frequency instruction issued by the MCU control system module, and outputs a sinusoidalsweep frequency signal of the power, power amplification is performed on a resonant signal generated by the DDS signal module via the radio frequency power amplification module, the signal subject tothe power amplification is connected to the phi network interface circuit module, the sinusoidal sweep frequency signal acts on a wafer through a phi network to cause the same to generate mechanicalvibration, meanwhile the mechanical vibration of the wafer generates an alternating electric field, when the external positive sweep frequency signal frequency is a certain particular value, the amplitude is significantly increased, and when a signal with a significantly increased amplitude is generated, an effective signal is captured.

The invention relates to a gesture recognition system based on muscle electrical impedance signals. The gesture recognition system comprises a signal acquisition unit and an upper computer data processing unit, the signal acquisition unit comprises a main control module, a signal driving module, a signal detection module, an AD acquisition module and a wireless communication module; the main control module is connected with the signal driving module, the AD acquisition module and the wireless communication module; the signal detection module is respectively connected with an electrode and theAD acquisition module; the wireless communication module is connected with an upper computer through wireless transmission and transmits collected signals to the upper computer for processing. The system and method can directly reflect the intrinsic state of the muscle, has good sensitivity to low-speed movement, and is high in muscle contraction sensitivity, good in robustness, large in signal amplitude, controllable in frequency and simple in preprocessing.

A motion sensor which has a coil that surrounds a ferromagnetic core and at least one magnet that is longitudinally movable along the coil. The magnet causes a magnetic saturation of the ferromagnetic core in an associated zone that covers a portion of the length of the coil. An evaluation unit generates a position signal in dependence on the position of the movable magnet along the longitudinal extent of the coil. The coil has at least two superimposed winding layers that surround the ferromagnetic core and are wound in opposite directions. The windings of adjacent segments generally have about the same width over which the winding density remains constant. Thus, the winding density of the segments of one of the winding layers increases linearly over the length of the sensor while the winding density of the segments in the other winding layer linearly decreases over the sensor length.

The invention discloses an infrared methane measuring device and measuring method capable of realizing accurate positioning. The measuring device comprises a main controller, a distributed feedback laser, a telescopic structure, a baffle, an explosion-proof casing and a system power supply. The main controller is connected with a modulation signal generating circuit, a laser temperature control circuit, a first wireless communication module and a display device respectively through serial ports. A laser diode, an NTC thermistor, a semiconductor cooler and a photodiode are packaged in the distributed feedback laser; the laser diode is connected to the modulation signal generating circuit; and the NTC thermistor and the semiconductor cooler are connected to the laser temperature control circuit respectively. A photoelectric conversion circuit, a harmonic detection circuit, a co-controller and a second wireless communication module are arranged in the baffle successively; the co-controller is connected with the photoelectric conversion circuit, the harmonic detection circuit and the second wireless communication module respectively through serial ports; and the photoelectric conversion circuit and the harmonic detection circuit are connected.

An amplifier for amplifying a radio signal to a defined power output level is presented, wherein the amplifier comprises an amplifier input port, an amplifier output port, a first transistor for amplifying the radio signal received at a first transistor control input, wherein a first transistor output of the first transistor is supplied by a first power source; a at least second transistor for supplying the first transistor from a at least second power supply source. The at least second power supply source is added by the at least second transistor as a function of the power output level of the amplifier.

The invention discloses an electro-oculogram intelligent wheelchair and a control method thereof. The electro-oculogram intelligent wheelchair comprises a wheelchair mechanism, a signal acquisition device, a signal processing device and a wheelchair motion control device. The signal acquisition device comprises a bipolar lead electrode patch assembly and a signal acquisition module. The signal processing device comprises a feature extraction module and a mode recognition module. The feature extraction module is used for extracting waveform features of electro-oculogram signals. The mode recognition module is used for firstly acquiring various feature information of waveform features, and then comparing various feature information with various preset recognition parameters in a preset recognition mode to determine a motion mode corresponding to the waveform features. The wheelchair motion control device is used for driving the wheelchair body to move according to a motion mode determined by the mode recognition module. The electro-oculogram intelligent wheelchair can accurately control the intelligent wheelchair through the electro-oculogram signals, and has good real-time performance, more reliable extraction, simple and convenient parameter adjustment, strong applicability, simple operation and convenient adjustment.