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669results about How to "Improve signal-to-noise ratio" patented technology

Method and device for non destructive evaluation of defects in a metallic object

A device for non destructive evaluation of defects in a metallic object (2) by eddy currents, comprises a field emitter (3) for emitting an alternating electromagnetic field at a first frequency fi in the neighbourhood of the metallic object (2), and a magnetoresistive sensor (1) for detecting a response signal constituted by a return electromagnetic field which is re-emitted by eddy currents induced by the alternating electromagnetic field in the metallic object (2). The device further comprises: a driving circuit (230) for driving the magnetoresistive sensor (1) by a current at a second frequency fc which is different from the first frequency fi, so that the magnetoresistive sensor (1) acts as an in situ modulator; a detector for detecting a response signal between the terminals of the magnetoresistive sensor (1); a filter for filtering the response signal detected by the magnetoresistive sensor (1) to keep either the frequency sum (fi+fc) of the first and second frequencies or the frequency difference (fi+fc) of the first and second frequencies, and a processor for processing the filtered response signal and extract eddy current information on defects in the metallic object (2).
Owner:COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

Touch display device and manufacturing method thereof

The invention discloses a touch display device and a manufacturing method thereof. The touch display device includes a touch screen base plate and a pixel array base plate, and further includes a first shielding layer and a second shielding layer. The touch screen base plate includes a touch control structure layer and output leads of the touch control structure layer (including drive electrode leads and induction electrode leads); the pixel array base plate is provided with a pixel array and peripheral leads of the pixel array; the output leads of the touch control structure layer and the peripheral leads of the pixel array are overlapped in the light transmitting direction; the first shielding layer is arranged between the drive electrode leads and the peripheral leads of the pixel array; and the second shielding layer is arranged between the induction electrode leads and the peripheral leads of the pixel array. The shielding layers reduce the parasitic capacitance between the peripheral leads of the pixel array base plate and the output leads of the touch control screen base plate, avoid the condition that drive electrodes and induction electrodes of the touch screen are coupled through the parasitic capacitance, and further improve the SNR (Signal to Noise Ratio).
Owner:SHANGHAI TIANMA MICRO ELECTRONICS CO LTD

Optical fiber distributed type sound wave monitor system

Provided is an optical fiber distributed type sound wave monitor system. Narrow-linewidth frequency-modulated lasers output by a frequency modulation DFB fiber laser are used as the light source of the optical fiber distributed type sound wave monitor system, the lasers output by the frequency modulation DFB fiber laser enter an acoustic optical modulator and are modulated to be pulse lasers through the acoustic optical modulator, the pulse lasers pass through a first optical amplifier and a first optical filter and then enter a second circulator and sensor fibers, the pulse lasers per unit can emit rayleigh scattering light within the range of the passed sensor fibers per unit length, and signals output by the second circulator pass through a second optical amplifier to enter a second optical filter and output backscattering rayleigh signals. The backscattering rayleigh signals between different unit lengths on one sensor fiber are interfered with the method of an interferometer, the interfered signals pass through electrical signals output by a second photoelectric detector and enter the optical fiber distributed type sound wave monitor demodulation system though a phase carrier demodulation module, and the change analysis of the phases of the sensor signals at corresponding positions is achieved.
Owner:LASER RES INST OF SHANDONG ACAD OF SCI

Method for optically measuring distance

The invention relates to a method of measuring the distance between a fixed point and an object, by the steps of:a) transmitting a light pulse (11) from the fixed point at a selected instant of transmission;b) periodically scanning of light intensity received at the fixed point and continuously storing, as a set of received scanned signal values, the scanned values at the scanning rate during a predetermined measuring time window (13) embracing the instant of reception of the light pulse reflected from the object;c) repeating steps a) and b) N number of times in order to obtain N number of sets of received signal values;d) summing the individual stored sets of received scanned signal values, set by set, to a summed scanned value set during a calculating window (14) following the N measuring time windows (13);e) repeating steps a) through d) in order to obtain a further summed scanning value set, whereby during or following step d) the further summed scanned value set is added, scanned value set by scanned value set, to the present summed scanned value set to actualize the latter, and whereby an equalizing portion of a summed scanned value set is optionally subtracted therefrom before and/or after the mentioned addition;f) searching within the summed scanned value set for significant scanning values which satisfy predetermined threshold values;g) repeating steps e) and f) until significant scanning values have been detected; andh) determining the looked-for distance from the position of the detected Significant scanning values in the summed scanned value set.
Owner:PERGER ANDREAS
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