62 results about "Signal Sensitivity" patented technology

An invention that utilizes signals from an accelerometer in resonant frequency bands or high frequency bands to, in a cost-effective manner, measure wear particle penetration of lubricant and lubricant degradation, both of which greatly affect prediction of residual service life; and, using as a basis these measurements of wear particle penetration and lubricant degradation, enables accurate estimation of residual service life for rolling bearings in the early stages. The invention is comprised of a means of obtaining fundamental data that uses a testing device to obtain data regarding the relationship, for rolling bearings (3), of wear particle penetration levels to vibration levels and service life, or to obtain data regarding the relationship, for rolling bearings (3), of lubricant degradation levels to vibration levels and service life; a means of measurement, where an accelerometer (4) is used to obtain vibration signals of diagnostic rolling bearings (3) residing on mechanical rotating devices (1, 2) for the purpose of measuring signals in resonant frequency bands only detectable at extremely high levels of sensitivity or signals in high frequency bands; and a means of prediction that uses readings obtained via said means of measurement and data obtained via said means of obtaining fundamental data to predict, for diagnostic rolling bearings (3), wear particle penetration levels and lubricant degradation levels, and to calculate residual service life for diagnostic rolling bearings (3).

A super-regenerative receiver uses controlled Q-quenching and may limit the resonant tank circuit amplitude by loading the tank circuit as soon as regenerative oscillation is detected. An amplitude detector is coupled to the regenerative amplifier and controls a Q loading circuit coupled to the tank circuit of the regenerative amplifier. The amplitude detector turns on the Q loading circuit which then stops the regenerative amplifier from oscillating, and the Q-loading remains on for a brief time to insure that the regenerative amplifier has stopped oscillating. After the brief time, the Q loading circuit is turned off and the regenerative amplifier goes into oscillation again. This cycle repeats controllably over and over, resulting in a lower self-induced noise floor and improved received signal sensitivity. The super-regenerative receiver may be used in the very low frequency (VLF), low frequency (LF), medium frequency (MF), high frequency (HF), very high frequency (VHF) and super high frequency (SHF) ranges to receive continuous wave (CW), amplitude modulated (AM) and frequency modulated (FM) radio signals.

A signal adaptive filtering technique for recognizing touch and release events as indicated from a measured capacitance signal received from a capacitive touch sensor device in order to improve electromagnetic noise immunity, event detection responses, adaptability to dynamically changing environments, and adaptability to signal sensitivity changes and signal offset over an extended period of time. A capacitive touch sensor system may include one or more capacitive touch sensor devices, each sending a measured capacitance signal that outputs a baseline capacitance signal during a release event, and outputs an increased capacitance signal during a touch event. The system updates the baseline capacitance signal with a filter, wherein a transfer function of the filter varies as a function of a current state of the capacitive touch sensor device, determines a range of capacitance values calculated from the baseline capacitance signal in which a recognition of the touch event will not be performed, creates a predicted signal from a filtered version of the measured capacitance signal, and recognizes a touch or release event from a comparison of the measured capacitance signal to the predicted signal.

A method of controlling the signal sensitivity of a receiver module of a remote signal communication system includes initializing a PASE function and actuating a switch from a first position to a second position. The second position represents an open switch wherein either an external antenna or a LNA circuit or both are shut off. The switch is returned to a first position in response to completion of a PASE command.

The invention discloses an ultrasonic nondestructive testing system. The ultrasonic nondestructive testing system comprises a laser ultrasonic transmitting system, an ultrasonic receiving system, a control and analysis imaging system and a three-axis platform system; the laser ultrasonic transmitting system comprises a high-frequency fiber laser, a light spot shaping device, a scanning galvanometer and a focusing mirror; the ultrasonic receiving system comprises a multi-array-element piezoelectric sensor, a charge amplifier and a multi-channel high-speed data acquisition card; the control andanalysis imaging system comprises a computer, a waveform processor and an imaging display and controller; the three-axis platform system comprises a three-dimensional mobile platform, a to-be-detectedworkpiece and an ultrasonic probe. According to the system of the invention, omnibearing 360-degree detection of surface and internal defects can be realized, the working efficiency is higher, the signal receiving sensitivity is higher, the price is low, the signal envelope extraction precision is higher, and the system is more suitable for industrial use.

In a defect inspection method, first and second inspection conditions having a first sensitivity of detection signal and having a second sensitivity of a detection signal for a defect of interest (DOI), respectively, are determined. The first and second sensitivities are different. First and second images of the same detection region on a substrate surface under the first and second inspection conditions respectively, are obtained. The first and second images are matched to detect a defect in the detection region.

The invention aims to provide a new method for ultrasonic flaw detection of a pressure-bearing cast iron device, namely a grain characteristic-based improved split spectrum method in ultrasonic flaw detection of the pressure-bearing cast iron device, wherein compared with a conventional cast iron flaw detection, the method enables a system to obtain higher signal-to-noise ratio, faster response time and higher flexibility. Because an internal organizational structure of cast iron is not uniform and the grain size is larger, when ultrasonic waves are used for flaw detection, attenuation of the ultrasonic waves is larger when in propagation, sporadic reflection is prone to generate, and forest-like or grass-like echoes are produced, resulting in poor flaw detection sensitivity. The method utilizes effects of an average grain size and an crystal orientation angle (an included angle of the acoustic wave incident direction and the grain axis) of the cast iron internal grain characteristics on ultrasonic scattering and attenuation, a noise time-frequency characteristic and a flaw echo frequency dispersion characteristic with obvious grain characteristics are caused, optimized split spectrum parameters are obtained through analysis of noise and echo signals, and thus with utilization of the split spectrum technology, the scattering noise can be well reduced and the ultrasonic echo signal sensitivity can be well improved.

An apparatus and method for controlling Low Noise Amplifiers (LNAs) in a dual standby portable terminal according to communication modes are provided. The apparatus and method improve the received signal sensitivity of the receiving unit of the dual-standby portable terminal. The main controller generates an active control signal when a state of the main controller is switched from a reception standby mode to a call mode, and transmits the active control signal to a sub-controller. The sub-controller maintains a turned on state of an LNA under the control of the sub-controller, according to the active control signal.

A method for calibrating a selected yaw rate sensor includes: determining a scaling function between a yaw rate sensitivity and a test signal sensitivity of a yaw rate sensor selected for carrying out a test and denoted as first sampling yaw rate sensor is determined in a first method step, the scaling function being determined from a measured first sample yaw rate sensitivity and from a measured first sample test signal sensitivity of the sampling yaw rate sensor; calculating a production yaw rate sensitivity for a yaw rate sensor denoted as production yaw rate sensor from a measured production test signal sensitivity of the production yaw rate sensor and the scaling function; and subsequently calibrating the production yaw rate sensor with the aid of the production yaw rate sensitivity.

The invention provides an antenna element and a display device including the same. The antenna element according to embodiments of the present invention comprises: a dielectric layer; a first electrode layer placed on the top surface of the dielectric layer, including a radiation electrode, and having a first mesh structure; and a second electrode layer placed on the bottom surface of the dielectric layer and having a second mesh structure. The first mesh structure and the second mesh structure are aligned to be projected with offset from each other in the plane direction with the dielectric layer interposed therebetween. The antenna device can be inserted or mounted in front of the display device to improve signaling sensitivity and transmittance and minimize degradation of image qualityof the display device. In addition, the antenna device may include a mesh structure formed of a metal material to have improved flexibility, and thus may be effectively applied to a flexible display device.

The invention relates to a torsion angle dynamic measuring device and method based on a piezoelectric deflection table. The device comprises two parts which are a reference emitting light pipe and a measuring light pipe; an optical fiber coupled laser A(1) is used as a point light source, linearly polarized light is formed after light passes through a polarizing plate (13) of a torsion sensitive assembly A(2), parallel light is formed after the light passes through a collimating objective lens (3) and is irradiated to the measuring light pipe, the measuring light pipe receives linearly polarized parallel light through a receiving objective lens (4), and angular movement of a polarizing plate of a torsion sensitive assembly B(6) is enabled via the piezoelectric deflection table (5); a polarization detection PSD detector (11) outputs a maximum current when the polarizing plate of the torsion sensitive assembly B(6) is in the same polarization direction as the linearly polarized light. Adeflection angle of the polarizing plate of the torsion sensitive assembly B(6) is a torsion angle. The invention relates to the device and the method for combining a compact optical-mechanical structure and a high-sensitivity electronic system to complete fast and high-precision measurement of the torsion angle.

An antenna device according to an embodiment of the present invention includes a dielectric layer, and an antenna pattern disposed on the dielectric layer. The antenna pattern includes a mesh structure in which unit cells defined by a plurality of electrode lines are assembled. A minimum distance between opposite sides facing each other in the unit cell is from 20 μm to 225 μm, and a line width of the electrode line is from 0.5 μm to 5 μm. A visual recognition of electrodes may be suppressed and a signal sensitivity may be enhanced by using the unit cell structure.

A maximum sensitivity optical scanning system is disclosed. It finds use in a variety of applications, including the reading of biopolymeric arrays. It operates by scanning sample at a setting selected to result in signal saturation for some, but not all available data. Subsequent scans of the same area are taken at lower sensitivity settings (in terms of detector gain and / or excitation light source gain or attenuation) and data from at least the previously saturated regions is obtained. If system sensitivity is set too low to produce useful results, optional features may adjust sensitivity upward and follow with an increased sensitivity scan as a remedial measure. Full signal sensitivity is better preserved as most needed in taking data for the weakest signals first with the high-level scan. Data for sample producing stronger signals that can better tolerate photobleaching is then taken in one way or another.

The invention relates to the field of signal processing, and discloses a device for fusing pulse signals among multiple modules. The device comprises a plurality of digital receivers and a signal fusion device, and each digital receiver comprises: an AD used for converting a pulse analog signal into a pulse digital signal; a signal detector which is used for detecting a pulse signal; and a parameter measurer which is used for measuring parameters of the pulse signals. The signal fusion device is used for signal fusion among a plurality of digital receivers. According to the invention, throughthe plurality of digital receivers and the signal fusion device, the problem that the fused pulse signal description word cannot contain the amplitudes and phases of all channels when the pulse signalis near the sensitivity, resulting in reduction or error of the precision of subsequent direction finding, is solved. The integrity and correctness of signal fusion near the pulse signal sensitivityare ensured.

The invention provides a novel radio frequency excitation system based on an overhauser effect, which belongs to the technical field of magnetic field measurement sensors. The system comprises a radiofrequency signal source module, a radio frequency power amplification module and a radio frequency excitation module. The radio frequency excitation module adopts an Alderman-Grant coil to replace atraditional structure, the quality factor of the coil is higher, the sensitivity of an output signal is improved, and the polarization degree of a working substance in the overhauser magnetometer is high. Under the condition that the size of the coil is fixed, the resonant frequency required by the coil can be obtained only by adjusting the tuning capacitance value in the simulation process, so that the coil can adapt to different working substances. The coil equivalent circuit is simple in structure, and the coil can be tuned in a required frequency range more easily.

The present invention is related to location positioning systems, and more particularly, to a method and apparatus for making accuracy improvements to a GPS receiver's navigation calculations. According to a first aspect, the invention provides an extreme sensitivity GNSS tracking architecture. According to other aspects, the architecture includes multiple loops per channel, with the loops implemented with hardware and / or software. According to still further aspects, the architecture includes a multi-level lock detection algorithm designed to provide a trade-off between sensitivity and speed that is not possible with existing tracking architectures.

The invention discloses sound production equipment, and the equipment comprises a shell; a front sound outlet and a rear sound outlet are formed in the shell; a first loudspeaker and a second loudspeaker are arranged in the shell; a front cavity of the first loudspeaker is communicated with the front sound outlet, a rear cavity of the first loudspeaker and a front cavity of the second loudspeaker are both communicated with the rear sound outlet, and a rear cavity of the second loudspeaker is closed; the sound signal output by the rear cavity of the first loudspeaker is opposite to the sound signal output by the front cavity of the second loudspeaker in phase, and the sound signal output by the rear cavity of the first loudspeaker is opposite to the sound signal output by the front cavity of the first loudspeaker in phase. The purpose of attenuating sound radiation to the outside can be achieved, and the purposes of weakening attenuation of far-field sound signals and improving the sensitivity of the sound signals at the human ears can also be achieved. The invention further discloses a control device of the sound production equipment and the playing equipment, which have the above beneficial effects.

The embodiment of the invention provides a communication system, a communication method and a computer storage medium. The communication system comprises at least two millimeter wave communication units, one of the millimeter wave communication units is a reference millimeter wave communication unit, a frequency synchronization channel is established between the reference millimeter wave communication unit and other millimeter wave communication units, and a reference frequency is transmitted to other millimeter wave communication units through the frequency synchronization channel; and each millimeter wave communication unit demodulates the received millimeter wave signal through the corresponding radio frequency module based on the reference frequency, so that frequency difference cross modulation caused by reverse leakage is eliminated, the situation that the received millimeter wave signal cannot be correctly demodulated due to the frequency difference cross modulation is avoided, the signal frequency stability is improved, and the signal receiving sensitivity is improved.

The invention relates to a method for installing an optical fiber safety prewarning sensor which is used for protecting and prewarning the safety of buried structure or ground structure and facilities. The method comprises that a sensing optical cable (2) is arranged around the buried structure or the ground structure and the facilities (3) by underground laying, and is characterized in that one or a plurality of loops of sensing optical cable(s) (2) is / are buried underground around the protected structures and the facilities (3) in a shape similar to plane projection of the protected structures and the facilities (3); furthermore, the loop spacing is less than or equal to two times of monitoring sensitivity radius of the sensing optical cable (2), and the burying depth of the sensing optical cable (2) is less than the monitoring sensitivity radius of the sensing optical cable (2). The optical fiber sensor installed by the method has high, effective and reliable signal sensitivity.

A pulse radar system and method has long range unambiguous image reflections at high pulse repetition frequency (PRF), long range high resolution radial velocity not limited by Doppler Nyquist limiting, improved signal sensitivity, and strong in-band interference rejection, thereby improving existing radar by increasing the transmission pulse rate by uniquely tagging each outgoing pulse so they can be easily separated when received.

The invention relates to a network analyzer measuring device and system, which is characterized in that an excitation signal output by an output port of a network analyzer flowing through a measured piece is converted into an electromagnetic wave signal through a microwave radio frequency device, and the electromagnetic wave signal is received by a signal detection device and is converted into a reflection signal; and a microwave measuring instrument performs optimization frequency reduction processing on the reflection signal to obtain a feedback signal and sends the feedback signal to an input port of the network analyzer. On the basis, the microwave measuring instrument is used for performing power amplification on the reflection signal and removing a noise signal, and the low-frequency signal output to the input port of the network analyzer is high in signal sensitivity and high in detection speed, so that the sensitivity and the precision of subsequent measurement by the network analyzer are improved.

An antenna device according to an embodiment of the present invention includes a dielectric layer, and an antenna pattern disposed on the dielectric layer. The antenna pattern includes a mesh structure in which unit cells defined by a plurality of electrode lines are assembled. A minimum distance between opposite sides facing each other in the unit cell is from 20 μm to 225 μm, and a line width of the electrode line is from 0.5 μm to 5 μm. A visual recognition of electrodes may be suppressed and a signal sensitivity may be enhanced by using the unit cell structure.

The invention discloses a contact type displacement sensor measuring device. Including: measurement part and data conversion part, the measurement part includes a housing, the connection part on the top of the housing is detachably connected to the data conversion part; the connection part is provided with a support arm, extending to the bottom of the housing; the sensor and the data conversion part in the housing electrical connection; the first end of the sensor is fixed on the measuring pen, and the second end lower than the first end is fixed on the support arm; the end of the measuring pen movable up and down in the housing is provided with a probe protruding from the bottom surface of the housing, and When the object under test moves relative to each other, the measuring pen is pushed upwards, the first end is far away from the second end, and strain is generated, and the data conversion part completes the measurement. The invention also discloses a measuring circuit of a contact displacement sensor. The invention uses a detachable structure adapted to the flexible strain sensor for measurement, improves system flexibility, original signal sensitivity and measurement accuracy, reduces circuit complexity, and has the advantages of simple structure and fast measurement.

The invention discloses an independent sideband modulation signal demodulation method based on an FPGA, and the method comprises the steps: building a mathematical expression formula of an independentsideband modulation signal s(t); carrying out the Hilbert transformation of the signal s(t), and obtaining a signal s(t)<^>; inputting the signals s(t) and s(t)<^> into a first channel, and carryingout the down-conversion operation; enabling the signals to pass through a group of extraction filters, and obtaining a signal m1(t); inputting the signals s(t)<^> and s(t) into a second channel, carrying out the down-conversion calculation, enabling the signals to pass through a group of extraction filters, and obtaining a signal m2(t); carrying out the Hilbert transformation of the signal m2(t),and obtaining a signal m2(t)<^>; carrying out the Hilbert transformation of the signal m2(t)<^> again, and obtaining a signal -m2(t); carrying out the algorithm calculation of the obtained signals m1(t) and m2(t)<^>, and respectively solving upper and lower sideband signals. Based on the software radio core thought, the method employs the basic idea of the digital quadrature demodulation, combinesthe Hilbert transformation, designs two paths, achieves the algorithm calculation of the obtained signals, obtains the upper and lower sideband signals, is high in sensitivity of a demodulated signal, and is suitable for the demodulation application of LSB / USB / SSB signals.

The embodiment of the invention provides an optical fiber information leakage device and method for coherent detection. The device comprises an optical communication transmitter device, a phase compensation and control device and an optical communication receiver device, The optical communication transmitter device is used for generating a BPSK optical signal with a preset code rate. The phase compensation and control device is used for setting control loop parameters according to the eye pattern opening degree proportion, so that a preset optical phase shift is kept between the BPSK optical signal and the tunable laser. The optical communication receiver device is used for adjusting the polarization states of the BPSK optical signal and the tunable laser to be aligned with the axis of theoptical mixer so as to realize coherent beat frequency of the optical signal and the tunable laser. According to the embodiment of the invention, the signal sensitivity is improved through an opticalheterodyne technology, stable beat frequency signals are realized through phase compensation and control of automatic program control, receiving and detection are facilitated, and meanwhile, the whole device adopts an all-fiber structure, so that an internal optical path is flexible, and the structure is reliable.

The invention discloses an information security transmission method based on photon noise aliasing multi-ary transformation. Firstly, by sending synchronous information between the sending end and the receiving end to measure the characteristics of the optical fiber channel, the communication between the sending end and the receiving end is realized. The signal is synchronized, and then the sending end jointly modulates the binary signal and the random key signal into a high-order signal, and uses the characteristic that the high-order signal is sensitive to noise to hide the high-order signal in the photon noise to form a confidential signal; according to the optical fiber channel Reciprocity, the receiving end generates a key that is fully matched and synchronized with the sending end, produces a multi-ary threshold judgment signal, and finally compares the received secret signal and the multi-ary threshold judgment signal bit by bit to restore the correct received signal. The method is simple to implement, has good communication network compatibility, strong anti-eavesdropping ability, and low communication cost. It can be applied to information protection of backbone optical networks and dedicated optical networks, and has certain application potential in the field of optical network physical layer confidential communication.

The invention provides a CIS gene chip and a manufacturing method thereof. The method includes: providing a CIS chip, the CIS chip includes a pixel photosensitive area, thinning a dielectric layer in the pixel photosensitive area of ​​the CIS chip; forming an amination The aminated substance covers the thinned area of ​​the dielectric layer, and the CIS gene chip formed thereby can shorten the distance between the signal source and the signal collection area, improve the signal sensitivity, and improve the accuracy of the test results. At the same time, its analysis equipment can be miniaturized, and it can break the site limitation of gene analysis and reduce the cost, and can improve the mass production of CIS gene chips.

The invention discloses a rapid scanning method and system for detecting microcracks on the surface of pressure equipment, and the scanning system at least comprises a probe combination which comprises probes with similar signal sensitivity but reduced spot size in equal ratio, wherein each probe has a working mode and a standby mode during detection; an excitation signal generator module and a displacement driving module which control the working probe to scan the surface of the detected body; a signal conditioning module, wherein the working probe receives a feedback signal of the surface of the detected body, converts the feedback signal into an electric signal and inputs the electric signal into the signal conditioning module; a signal acquisition module which is used for receiving the conditioned signal; an output module which is used for outputting a final scanning result; and a manual operation input module which provides a manual control input function. According to the method and the system, the scanning distance with the same defect resolution is greatly shortened, the scanning height is linear, the method and the system are suitable for computer processing planning, and the execution reliability can be relatively better guaranteed.

The invention discloses a bifunctional MoS 2 / ZnO composites in the application of bisphenol A trace detection, the MoS 2 / ZnO composites prepared by ①MoS 2 Preparation, ②MoS 2 / ZnO is prepared in two process steps. The method of the invention has simple operation process, low cost and good reproducibility, and the obtained Raman enhanced signal has high sensitivity and good stability, and has important research value and good application in the field of preparing composite materials. Application prospects, and the MoS prepared by this method 2 The / ZnO composite material has a very good photocatalytic effect on MB and can also realize the trace detection of BPA.