13 results about "Dead time" patented technology

The invention discloses a VETO detection method and system for shielding cosmic ray muons, and particularly relates to the field of cosmic ray muon background shielding, and the method comprises the steps: obtaining response data outputted by an outer-layer VETO detector in a current observation period, carrying out the aggregation of the response data according to a response time sequence and a spatial adjacent relation, and carrying out the detection of the cosmic ray muons. Identifying a response group corresponding to the same muon crossing, and outputting a muon event; and based on the muon events, extracting the head and tail response moments, the cross-region propagation sequence, the partition response density and the crossing depth corresponding to each response group, and generating a corresponding post-effect mark according to the combination relationship of the head and tail response moments, the cross-region propagation sequence, the partition response density and the crossing depth. A post-effect mark is generated for a muon event and a partition rule is expanded, so that constrained space-time correlation is formed between a delay background and a candidate event, and shielding, observation and warning processing is performed in a layered manner, so that a delay false signal is relatively inhibited, and dead time diffusion caused by fixed window expansion is relieved.

The invention discloses a control method and system for reducing dead zone time in a waveform switching process of a signal generator, and the method comprises the steps: starting a delay window through detecting a user parameter modification operation, and resetting timing if an operation is detected in the window again; after the window is finished, generating a first check code based on the to-be-updated parameter, and comparing the first check code with a second check code in a previous stable state; and if not, an updating instruction is sent to the waveform generation unit. And after the waveform generation unit receives the instruction, when the current waveform period is ended, the waveform is controlled to sequentially pass through the falling edge transition section, the low level holding section, the rising edge transition section and the high level holding section to form a complete transition period, and the waveform is switched to a target waveform parameter after the period is ended. According to the method, near-real-time, continuous and burr-free switching of various waveforms is realized, and the system response speed, the switching fluency and the reliability and efficiency of an automatic test process are remarkably improved.

The invention discloses an activity measurement method based on an adaptive coincidence window and dead time correction. The method comprises the following steps: (1) arranging three photomultipliers around a sample to be detected, monitoring three paths of signals generated by the three photomultipliers, and when any path of signal has a rising edge, triggering a self-adaptive coincidence window of which the width is determined by a counting rate R; when R < =, = to ensure that a real coincidence event is captured; at gt; rgt; when R is greater than R, decreasing gradually along with the increase of R so as to reduce accidental coincidence counts; when R > =, = to maximize coincidence efficiency; 2) performing coincidence event judgment in the adaptive coincidence window; the width of the dead time window is adaptively adjusted according to the counting rate R, when R is larger than or equal to R, the width of the dead time window is shorter, and when R is smaller than or equal to R, the width of the dead time window is longer, (4) after the dead time window is finished, normal monitoring is recovered, and (5) when measurement is terminated, the activity of the sample to be measured is reversely deduced through coincidence counting.

The invention relates to a switching system comprising: - a switching arm (110) comprising two switches, a high-side switch (Q6) and a low-side switch (Q2); - a control system (114) designed to switch the switching arm (110) alternately between a first configuration in which the high-side switch (Q6) is open and the low-side switch (Q2) is closed, and a second configuration in which the high-side switch (Q6) is closed and the low-side switch (Q2) is open, the control system (114) being designed to, for each switching operation command, open the switch that was initially closed, then command the closing of the switch that was initially open at the end of a dead time; and - a measuring device (116) for measuring a switching voltage (LVCE) present between the terminals (LC, LE) of one of the switches (Q2). The control system (114) is also designed to, for each of at least one switching operation: - monitor the measured switching voltage (LVCE) after the command to open the switch that was initially closed; and - determine the dead time of the switching operation under consideration on the basis of the monitored switching voltage (LVCE).

This invention specifically relates to a driving timing control method for a spaceborne infrared spectrometer detector, solving the problem that the overlapping time of pixel row transfer time and signal exposure time cannot be guaranteed to be completely consistent, resulting in inaccurate spectral bands and ultimately wasted resources. This invention includes the following steps: Step (1), determining the dead time difference b; Step (2), measuring the current frame period D; Step (3), dynamically adjusting the dead time difference a; based on the frame period D, exposure time E, and pixel row transfer time T... line The time difference b of the dead zone obtained in step (2) is used to dynamically adjust the time difference a of the dead zone; in step (4), during the satellite's operation in orbit, the frame period D and exposure time E are adjusted in real time according to the ground features and orbital altitude. Steps (2) and (3) are repeated to dynamically adjust the time difference a of the dead zone until the satellite completes a complete imaging of one orbit during its operation in orbit, thereby obtaining the target spectrum.

The application discloses a device for reducing dead time in a time measurement system and relates to the technical field of time measurement. The device comprises a delay chain, a high-speed sampling clock module, an event acquisition module, a plurality of event recording modules, a low-speed processing clock module and an event combination module. The event acquisition module is used for periodically sampling and processing the delay chain at a high-speed sampling working frequency to obtain a data stream. The plurality of event recording modules are used for respectively and alternately recording the data stream from the event acquisition module. The event combination module is used for periodically and synchronously reading a plurality of data streams recorded in the plurality of event recording modules at a low-speed processing working frequency, and combining final time information according to the plurality of data streams. Thus, the low dead time purpose can be achieved, and the risk that the timing cannot meet the requirements in the FPGA layout and wiring can be reduced by means of processing resource exchange time.

The application discloses a kind of single-photon detector dead time dynamic control device and method, in the device, drive circuit, for after input signal amplification is loaded to avalanche photodiode cathode;Avalanche extraction amplification circuit is used to filter and amplify first avalanche analog signal, and output second avalanche analog signal;Multi-amplitude discrimination circuit is used to discriminate the amplitude of second avalanche analog signal, and respectively output first avalanche digital signal to dead time processing module, amplitude data to dead time control module;Dead time control module sets signal to dead time processing module to output dead time;Dead time processing module processes first avalanche digital signal according to dead time setting signal and then outputs second avalanche digital signal.The application can dynamically adjust the setting of dead time according to the size of avalanche current amplitude in the detection process, and can improve the maximum count rate under the condition of low post-pulse probability.

The application relates to a dynamic gain compensation method of a silicon photomultiplier, which acquires gain compensation information in a first state of all unit detectors of a PET system and corrects online in a single event of a second state of all unit detectors, and the method comprises the following steps: an FPGA judges whether the unit detector is in the first state, if yes, gain compensation parameters of gain compensation information are acquired according to a gain acquisition mode, or gain compensation parameters in known gain compensation information are updated in real time according to the known gain compensation information; when the unit detector is in the second state, the FPGA corrects data in the single event of the second state according to the latest gain compensation parameters, so that detection data used for reconstructing a PET image is acquired based on the corrected data. The above method solves the problem that real-time temperature compensation occupies system resources, reduces system dead time and maintains the stability of the gain of a silicon photomultiplier of a PET system detector.

This invention belongs to the field of data processing technology, specifically relating to a fault detection method for an agricultural irrigation solenoid valve controller. The method includes: synchronously acquiring voltage and current sequences during the driving cycle; using dead-time data from the initial driving phase to identify the total loop parameters, including cable resistance and inductance, online; constructing a physical constraint operator based on these parameters and introducing it as a penalty term into the objective function of variational mode decomposition to perform physical model-driven signal decomposition on the current sequence, thereby extracting pure mechanical mode components; reconstructing the phase space of these components to generate a state point cloud and calculating the topological distance between this point cloud and the ideal point cloud; and comparing this distance with a preset threshold to determine whether the solenoid valve has a mechanical fault. This invention effectively overcomes the time-varying effect of the channel and achieves stable and accurate detection of early, weak mechanical faults.

The invention relates to a device and a method for adaptive control of the dead time in a half-bridge circuit.

Method for modeling dead time behavior in a forward operating mode (I) and in a reverse operating mode (II), wherein in forward operation (I) memory cells (S1, S2, ..., Sm, Sn) of a memory (14) are selected successively in a first sequence (R1) by means of a write pointer (SZ) to write values ​​(W1, W2, Wm, ..., Wn) into the memory cells (S1, S2, ..., Sm, Sn), and are selected by means of a read pointer (LZ) to read the values ​​(W1, W2, Wm, ..., Wn) from the memory cells (S1, S2, ..., Sm, Sn), wherein in reverse operation (II) the memory cells (S1, S2, ..., Sm, Sn) of the memory (14) are selected successively in a second sequence (R2) by means of the write pointer (SZ) to write values ​​(W1, W2, Wm, ..., Wn) into the memory cells (S1, S2, ..., Sm, Sn), and are selected by means of the read pointer (LZ) to read the values ​​(W1, W2, Wm, ..., Wn) from the memory cells (S1, S2, ..., Sm, Sn), where the first sequence (R1) has a different direction of progress than the second sequence (R2), where the reading pointer (LZ) is determined depending on the writing pointer (SZ), where, to switch from an output operating mode to a target operating mode, the write pointer (SZ) of the target operating mode is set to the last value of the read pointer of the output operating mode.

The invention relates to a circuit system (10) having a detection unit (12), a switching unit (14) and a logic unit (16). The detection unit (12) is designed to measure a dead time of the switching unit (14), and the logic unit (16) is designed to determine a change in the dead time on the basis of a value of the dead time measured by the detection unit (12) and thus ascertain a correction value for the dead time of the switching unit (14). Thus, the change in dead time in each step is not necessarily a previously specified constant value, but varies according to the measured dead time.