6 results about "Asymmetric waveform" patented technology

The invention discloses a waveform feature extraction method and system for irregular waveforms of a hyperspectral laser radar, and aims at solving the problem that asymmetric waveforms, weak echoes and overlapped echoes in multi-channel full-waveform laser radar signals are difficult to accurately decompose, modeling full-waveform signals collected by multiple spectral channels into superposition of echo components and background noise. A multi-channel waveform is preprocessed through noise threshold and pulse width combined constraint, the waveform position is determined by adopting a gravity center discrimination method, and time synchronization calibration of each channel signal is realized in combination with a multi-echo quality index. The method further utilizes a cubic B-spline function to carry out modeling on transmitted waveforms of all spectrum channels, carries out weighted accumulation on multi-channel echo signals to enhance weak echo signals, and adopts a multi-channel interconnection decomposition optimization strategy to realize accurate extraction of irregular waveform features under the constraint condition of keeping time parameters of sub-echoes of all the channels consistent.

An ion repulsive surface, comprises: a first plurality of elongated electrodes distributed along an axis, configured to receive a first RF voltage with an asymmetric waveform; and a second plurality o

The utility model provides a circuit for measuring asymmetric waveform alternating current, which is characterized in that the anode of a first switching diode is connected with an alternating current input end, the cathode of the first switching diode is connected with one end of a first current-limiting resistor, the other end of the first current-limiting resistor is connected with one end of a first capacitor, and the other end of the first capacitor is grounded; the negative electrode of the second switching diode is connected with the alternating current input end, the positive electrode of the second switching diode is connected with one end of the second current-limiting resistor, the other end of the second current-limiting resistor is connected with one end of the second capacitor, and the other end of the second capacitor is grounded. The other end of the second current-limiting resistor is connected with an alternating current output end; according to the utility model, the positive half-wave rectification circuit and the negative half-wave rectification circuit are adopted, asymmetric alternating current is superposed and integrated, the change condition of the asymmetric alternating current is effectively displayed, and the change condition of real current can be reflected.

The application discloses a method and device for hydrogen production by electrolysis of water. The anode and cathode electrode materials are clamped in the anode clamp and cathode clamp respectively, and the electrolyte is injected to immerse the electrode clamp. After adjusting the distance between the two electrodes to the preset reference distance, the electrolysis voltage is applied to start the reaction. The high-frequency oscillation mechanism drives the two electrodes to do reciprocating oscillation with the reference distance as the center. The oscillation frequency matches the inherent characteristic frequency of the electrode surface flow boundary layer. The fast-shrinking slow-expanding asymmetric waveform is adopted, and the amplitude does not change the macroscopic working distance between the two electrodes. The transient electrochemical signals are synchronously collected to correct the oscillation frequency, and the hydrogen and oxygen gases generated in the reaction are collected. The application can strengthen the ion mass transfer of the electrode interface, realize the early directional separation of bubbles, effectively improve the electrolysis efficiency, and adapt to multiple types of electrolyte and variable load working conditions.

The application discloses a water level sine wave identification and stack moving average cooperative wave elimination method and system, relates to data processing and hydrological monitoring, and comprises the following steps: a first-in-first-out stack with a length of L is established, and collected water level data is pushed into the stack; a fitting model with offset correction is established on a zero mean sequence, wherein a waveform center line offset amount is introduced in the fitting model; extreme points of all water level data in a window corresponding to the stack are detected, a time interval between adjacent wave peaks and wave troughs is calculated, and a half period is determined; the waveform center line offset amount is solved based on the half period and the fitting model; and cooperative wave elimination is performed according to the solved waveform center line offset amount and the collected water level data. The application identifies and eliminates the problem of unequal residual positive and negative deviations caused by asymmetric waveforms, and solves the problem of the non-ignorable systematic drift in long-term water level monitoring.

The present application relates to the technical field of drill bit, in particular to a small-diameter deep-hole stepped drilling method and drill bit. It comprises a guiding and centering part, a stepped cutting part and a tool shank part connected in sequence, and the tool body is provided with main chip removal grooves and auxiliary shearing grooves with different lead angles, and the grooves are staggered in phase. The drill bit axis is provided with a high-pressure internal cooling channel, and a micro radial jet hole with a specific back-swept angle is arranged near the rear flank surface of each cutting part. The self-adaptive drilling method matched with the drill bit automatically switches to a high-frequency pulsating feed mode when the spindle load increases by real-time monitoring of the spindle load, so that the feed speed fluctuates periodically according to an asymmetric waveform. Through the synergistic effect of mechanical shearing, directional jet and feed pulsation, the present application realizes the instant breaking, directional discharge and effective cooling of chips, solves the problems of chip removal blockage, insufficient cooling and poor precision in small-diameter deep-hole stepped machining, and significantly improves the machining efficiency, coaxial accuracy and tool life.