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 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.

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.

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.

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.

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.

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.