13 results about "Pulse height" patented technology

A time-discriminated scintillator light output measurement method is disclosed: The scintillator light generated by the sample under test under radiation source excitation is converted into an electrical signal; the electrical signal is amplified, and the rise time and pulse height of the digitized waveform are discriminated, acquired, and stored, or the long-gate integral value Qlong and the short-gate integral value Qshort are obtained. The pulse discrimination value PSD is obtained based on the long-gate integral value Qlong and the short-gate integral value Qshort; a two-dimensional distribution histogram of the low-light-output scintillator is generated with Qlong as the abscissa and PSD as the ordinate; the obtained two-dimensional distribution histogram is processed accordingly and projected onto the X-axis to obtain the scintillator energy spectrum; the full-energy peak in the energy spectrum is Gaussian fitted to obtain the center value and half-peak width, and then the light output and energy resolution of the scintillator are calculated. This invention can accurately detect and calibrate scintillator signals with low light output, with fast data acquisition speed and high output accuracy.

A power amplifier based reciprocal quantum logic (RQL) bias level sensor is used to measure and / or calibrate bias parameters of an AC bias signal and / or a DC bias signal supplied to an RQL circuit. The bias signal may include an output amplifier output bias current. The bias level sensor includes a stack of DC SQUIDs, with inputs supplied from the outputs of respective Josephson transmission lines (JTLs) that transformer-couple the SQUIDs. By stepping the relative strengths of the bias taps of the JTLs or the critical currents of the Josephson junctions in the DC SQUIDs, the output voltage signal of the bias level sensor can indicate whether the supplied bias value is an improved or optimized bias value when varied over a range. The outputs of two such bias level sensors driven by I and Q clocks can be compared to adjust the AC bias amplitude of the clocks. The relative clock phases can be adjusted as well.

This invention proposes a method and system for detecting the operational status of a controlled fusion device, belonging to the field of controlled fusion device operational status detection technology. The method includes: obtaining a pulse height spectrum based on measurement results from a liquid scintillator detector; normalizing the count values ​​for each channel address; inputting the normalized pulse height spectrum data into a Bayesian neural network model for forward propagation calculation. The training process includes: constructing a neutron response matrix by combining Monte Carlo simulation and experimental calibration; generating a set of simulated neutron energy spectra based on preset basis functions; generating a set of simulated pulse height spectra by convolving the neutron response matrix with the set of simulated neutron energy spectra; training a neural network model with weight parameters following a probability distribution using Bayesian inference based on data pairs; and performing an inverse transform on the model output to obtain the incident neutron energy spectrum distribution. This invention improves the stability and accuracy of neutron energy spectrum interpretation and provides quantitative information on the uncertainty of the inversion results.

This invention provides a method for molding a memory cell, the memory cell including a word line terminal and a bit line terminal, and molding is performed by applying a reference voltage to the bit line terminal. The molding method includes: a molding step, in which an enable voltage is applied to the word line terminal, and a molding voltage with a pulse height higher than the reference voltage and a pulse width lower than the reference voltage is applied to the bit line terminal; a reading step, in which a first reading voltage is applied to the bit line terminal to read the device resistance value of the memory cell; and a detection step, in which the molding operation is determined to be successful when the device resistance value is less than or equal to the standard resistance value.

The present invention relates to a device, system and method for determining pulse pressure variation of a subject. To enable more reliably determining pulse pressure variation of a subject the device comprises a signal input (11) configured to obtain an input signal representing a hemodynamic signal of the subject, a processor (12) configured to process the input signal and compute a pulse pressure variation and a signal output (13) configured to output the computed pulse pressure variation. The pulse pressure variation is computed by deriving a pulse height signal from the input signal, deriving a pulse height baseline and a de-trended pulse height signal from the pulse height signal as the ratio between the difference between extrema of the de-trended pulse height signal and the respective value of the pulse height baseline signal, and computing the pulse pressure variation from the de-trended pulse height signal and the pulse height baseline.

The invention discloses a near-infrared scintillator performance testing device and method, and belongs to the technical field of scintillator irradiation detection. A near-infrared sensitive silicon photomultiplier is adopted to replace a PMT, and in combination with a reading circuit (Sent Company) and a digital spectrometer, a set of test system covering the wave band of 270-900 nm is constructed. The number of SiPM single-photon response channels is determined through a multi-photon spectrum test, X-rays are utilized to excite a scintillator, a pulse height spectrum is collected, data are analyzed in combination with ROOT software, and key performance parameters such as light yield, energy resolution and decay time are calculated. The test method comprises the steps of SiPM multi-photon spectrum calibration, scintillator near-infrared luminescence verification, optical coupling and radioactive source excitation, signal digital acquisition and off-line processing. The system breaks through the limitation of traditional visible light detection, achieves efficient detection of the performance of the near-infrared scintillator, has the advantages of being simple in structure, wide in wave band coverage, capable of synchronously obtaining energy and time information and the like, and is suitable for the fields of medical imaging, radiation monitoring and the like.

This invention discloses an ASIC chip with an energy response self-calibration module, comprising a multi-pixel channel array containing N independent pixel channels. Each pixel channel includes a charge-sensitive amplifier module, a shaping circuit, a pulse energy discrimination module, and a counting module. The pulse energy discrimination module has a built-in comparator. The chip also includes an energy response self-calibration module, comprising a test pulse generator, a reference voltage control submodule, and a calibration logic control submodule. By controlling the pulse height and the magnitude of the reference voltage Vref, the S-curves of each pixel channel corresponding to different test pulse heights are obtained. Based on a preset calibration algorithm, the polynomial coefficients of the reference voltage and the calibrated DAC value for each pixel channel are calculated and stored. This invention enables consistent energy response across all pixel channels of the ASIC, and allows the calibration coefficients to be read after self-calibration to determine the differences between the ASIC channels.

To automatically measure radiation more accurately than before.SOLUTION: According to an embodiment, a radiation measurement system 200 includes a radiation detector 1, a preamplifier 2, and a radiation measurement adjustment device 100. The radiation measurement adjustment device 100 includes a high-speed waveform shaping amplifier 111, a pulse height discriminator 112 that discriminates a high-speed waveform signal and outputs a high-level signal, a trigger generator 113 that outputs a trigger signal after a predetermined delay time from the output of the high-level signal, a low-speed waveform shaping amplifier 121, a sample-and-hold device 122 that outputs an instantaneous value of a low-speed waveform signal at the time of the output of the trigger signal as a sample value, and an AD converter 123. This device is provided with a delay time adjusting part 130 for deriving the dependent characteristics of a digital sample value on a delay time, selecting an optimum delay time and defining it as the delay time of a trigger generator 113.SELECTED DRAWING: Figure 1

The invention relates to a lighting device having a light emitting diode array comprising an adjustable current source for each LED, which provides a pulse width modulated current with a pulse height, a control / regulation device for controlling / regulating the brightness of the individual LEDs, which can generate a theoretical value for the pulse height for the current source, and the brightness value can be set for each LED in accordance with the theoretical value and can be encoded in a video signal and can be provided on a video signal output, the light emitting diode array having a video signal input, the light emitting diode array having a decoding device connected to the video signal input, with which the brightness value can be decoded from the video signal and can be converted into a duty cycle, with which the pulse height can be generated, the theoretical value for the pulse height likewise being encoded in the video signal or decoded from the video signal and can be used by the current source for adjusting the current height.

The invention discloses a target detection method and system based on pulse vision, and relates to the technical field of target detection.The method comprises the steps that the pulse height of each pulse in an obtained pulse sequence matrix is determined, and a maximum light intensity difference matrix is determined; the pulse sequence matrix can record the time and pulse width corresponding to all pulses of each pixel of the image in a preset time period, and the maximum light intensity difference matrix records the maximum light intensity difference of each pixel; performing threshold binarization on the processed maximum light intensity difference matrix through a self-adaptively calculated threshold to obtain a binarized light intensity difference matrix; performing median filtering on the binarized light intensity difference matrix to obtain a filtered matrix; and calculating the position and time of the target by taking the intersection of the filtered matrix and the binarized light intensity difference matrix. The method can capture the micro-motion change of the unmanned aerial vehicle target, detects the position of the unmanned aerial vehicle target in the time period, achieves the effect of pixel-level target detection, and greatly improves the detection probability of the low-weak feature unmanned aerial vehicle target.

The application discloses a particle counting system and method, a first optical sensor is arranged on the side of a measuring light beam for receiving a particle scattering light signal in an air flow; a second optical sensor is used for detecting a light intensity signal of a light beam of a light source; a light beam control board adjusts the output power of the light source according to the light intensity signal detected by the second optical sensor, so that the light intensity of the light beam is constant; an air flow speed detection assembly detects the air flow speed flowing through a light chamber; a main control board adjusts the air flow speed according to the feedback data of the air flow speed detection assembly, so that the air flow speed is constant, or the particle scattering light intensity is corrected in real time according to the air flow speed; a high-speed data acquisition and processing module acquires an electric signal corresponding to the particle scattering light in real time and detects a signal baseline in real time, and the absolute intensity of the particle scattering light is obtained according to the difference between the particle pulse height and the baseline, and the particle size is distinguished based on the absolute intensity, so as to eliminate the particle size discrimination error caused by the baseline fluctuation. The scheme can guarantee the stability of 50% counting efficiency.

The embodiment of the application discloses an elevator control method and device based on a magnetic scale and a medium, and is used in the technical field of elevator control. The method comprises the following steps: controlling the elevator to run at a preset speed to obtain a plurality of leveling positions in the running direction of the elevator; determining the floor positions corresponding to the plurality of leveling positions, determining the magnetic scale height of each floor and the pulse height between adjacent floors based on the floor positions; determining the effective conditions of the leveling signal, the upper and lower limit signals and the upper and lower forced signals of the elevator through the position of the magnetic scale and the magnetic scale height; and controlling the running of the elevator within the corresponding pulse height based on the effective conditions of the leveling signal, the upper and lower limit signals and the upper and lower forced signals of the elevator, so that the height signal of the magnetic scale does not need to be converted into the pulse signal of the encoder, and the influence of the leveling of the elevator due to conversion accuracy is effectively avoided.

The invention provides a controllable fusion device operation state detection method and system, and relates to the technical field of controllable fusion device operation state detection. The method comprises the following steps: acquiring a pulse height spectrum based on a measurement result of a liquid scintillator detector; performing normalization processing on each channel address count value; inputting the normalized pulse height spectrum data into a Bayesian neural network model for forward propagation calculation, wherein the training process comprises the following steps: constructing a neutron response matrix by combining Monte Carlo simulation and experimental scales; generating a simulated neutron energy spectrum set based on a preset basis function; using the neutron response matrix and the simulated neutron energy spectrum set to generate a simulated pulse height spectrum set through convolution; based on the data pairs, Bayesian inference training is adopted to obtain a neural network model of which weight parameters obey probability distribution; and performing inverse transformation processing on the model output to obtain incident neutron energy spectrum distribution. According to the method, the stability and precision of neutron spectrum unfolding are improved, and uncertainty quantitative information of an inversion result can be provided.