33 results about "Pulse height analyzer" patented technology

The invention discloses a novel system and method of measuring concentration of radon in water. The novel system of measuring concentration of radon in water includes successively connected first Gamma detector, first linear amplifier, first single-channel pulse-height analyzer, first delay shaping circuit and first scaler, and successively connected second Gamma detector, second linear amplifier,second single-channel pulse-height analyzer, second delay shaping circuit and second scaler, wherein the output terminal of the first delay shaping circuit and the output terminal of the second delayshaping circuit are connected to the input terminal of a coincidence circuit; the coincidence output terminal of the coincidence circuit is connected with a third scaler; the novel system of measuring concentration of radon in water also includes a calculation module which is used for calculating the activity concentration C<222><Rn>: C<222><Rn>=n<Gamma Gamma 1> - n) / V<Elipson> <Gamma Gamma>of 222Rn in a sample to be measured, wherein n<Gamma Gamma 1> is the counting rate of the third scaler during the process of measuring the sample to be measured; n is the background counting rateof the third scaler; V is the volume of the sample to be measured; and Epsilon <Gamma Gamma> is the detection efficiency of a coincidence channel. The novel system and method of measuring concentration of radon in water can quickly reduce the measurement background and can achieve the effect of quickly and accurately measuring the concentration of radon in water.

The invention discloses a device and a method for controlling the residual stress on the surface of a metal microstructure. A laser micro shot blasting generation system and a measuring feedback system are respectively connected with a control system; a pulse laser beam is focused on an area to be subjected to shot blasting on the surface of a workpiece; incident X rays emitted by a synchronous accelerating irradiation light source enter a measurement box, are diffracted by the surface of the workpiece and then are received by a detector; electric pulse is amplified by an amplifier and enters a pulse height analyzer; signal pulse is transmitted to a counter, processed by a microcomputer and fed back to a computer control system by the microcomputer for error analysis and parameter correction; and a charge Coupled device (CCD) optical camera is used for positioning and monitoring a processing area on the surface of the workpiece. The invention effectively controls the residual stress on the surface of the metal microstructure, improves the mechanical properties of the metal micro component, prolongs the service life of the metal micro component, and enables the surface of the metal micro component to generate the residual pressure stress with the depth up to over 20mu m and the pressure ranging from -120 to -100MPa.

With a pulse-height analyzer, a reference-pulse generator generates a reference pulse of a given pulse height for a given period of time when an analog radiation pulse inputted to a comparator is higher than an initial threshold. A capacitor and a resistor receive the reference pulse, and then increase an increment threshold for the given period of time from the initial threshold to the given pulse height. Then the increment threshold is set as a reference voltage of the comparator. A pulse time width of the analog radiation pulse is determined through measuring a period of time from timing where the analog radiation pulse exceeds the initial threshold to timing where the analog radiation pulse being attenuated falls below the increment threshold.

A single channel pulse height analyzer realized by applying a peak position detecting method is characterized in that in the working circuit, detected nuclear pulse signals are subjected to filtering formation through an amplifier, and are outputted to an upper screening circuit, a lower screening circuit and a peak position detection circuit respectively through input circuits; the output signals processed by the upper screening circuit and the lower screening circuit are respectively inputted to the S end and the R end of an RS trigger circuit; the output signals processed by the lower screening circuit and the peak position detection circuit are respectively inputted to the input end of a gate circuit; the anticoincidence signals outputted by the RS trigger circuit and the coincidence signals outputted by the gate circuit are respectively inputted to an anticoincidence shaping circuit; the anticoincidence shaping circuit outputs counting signals. No manual dead time is introduced, the system dead time of the single channel pulse height analyzer is greatly reduced, the counting rate is improved, the structure of the circuit is simple, and the single channel pulse height analyzer can be suitable for detecting output signals of a nuclear radiation detector in common use.

The invention discloses an energy spectrum measuring system based on a software multichannel pulse-height analyzer. The energy spectrum measuring system comprises a radiation probe, a high-speed acquisition card and a computer, wherein the radiation probe is connected with the computer through the high-speed acquisition card, the radiation probe outputs radiation analog pulse signals to the high-speed acquisition card, the high-speed acquisition card converts the radiation analog pulse signals into radiation digital pulse signals and sends the radiation digital pulse signals to the computer, an energy spectrum acquisition control module, the software multichannel pulse-height analyzer and an energy spectrum display and analyzing module, which are realized based on software, are built in the computer, and the energy spectrum acquisition control module is connected with the high-speed acquisition card and conducts acquisition control and communication management for the high-speed acquisition card. The software multichannel pulse-height analyzer conduct smooth processing for the radiation digital pulse signals based on the three-point smoothing algorithm, analyzes the amplitude of the radiation digital pulse signals by using the five-point peak searching algorithm, and outputs analysis result data to the energy spectrum display and analyzing module for displaying and storing, thereby realizing the purpose of measuring radiation spectrum.

An inspection system according to various embodiments can include a stationary mono-energetic gamma source and a detector-spectrometer. The detector-spectrometer is configured to employ a modulation of energy bin boundaries within a multi-channel pulse height analyzer to encode voxels within the inspected object, and apply an analysis to determine the three-dimensional density image of the inspected object.

The invention belongs to the technical field of space radiation effect and strengthening, and particularly relates to an on-track monitoring device and method for space single event burnout effect. The monitoring device comprises a high-voltage direct current programmable power supply, a current-limiting protection resistor RB, a power MOSFET, a charge sensitive amplifier, a logarithmic converter and a pulse height analyzer, wherein the charge sensitive amplifier comprises a current-limiting resistor RL, a feedback resistor RF, a decoupling capacitor CD, a decoupling capacitor CF, a voltage holding capacitor CH and an operational amplifier. The monitoring method can realize the non-destructive testing of space single event burnout, provides a feasible non-destructive monitoring method for further obtaining single event burnout characteristic parameters in a simulated source condition, can comprehensively present characteristic information of single event burnout effect, and provides a reference for space radiation effect protection design.

An inspection system according to various embodiments can include a stationary mono-energetic gamma source and a detector-spectrometer. The detector-spectrometer is configured to employ a modulation of energy bin boundaries within a multi-channel pulse height analyzer to encode voxels within the inspected object, and apply an analysis to determine the three-dimensional density image of the inspected object.

A method of managing data obtained by measurements. The method permits EDS (energy dispersive spectroscopy) spectra to be collected in one operation. Energies detected by an EDS detector are converted by a pulse height analyzer into pulses of heights corresponding to the energies. The heights of the pulses in a distribution are assigned to multiple channels. The number of pulses in each channel is counted. A data processing circuit sends data blocks to a CPU. In each data block, a tag indicative of being X-ray energy data and the value of energy are combined. The CPU sequentially stores incoming data blocks into a hard disk.

A neutron detector comprises a gas-filled dielectric shell, preferably a glass balloon, having opposite electrodes. An electric field is established whereby ionizing particles may be detected via ionization and current flow in the gas, using a pulse height analyzer or other conventional means. The dielectric shell preferably has low gas permeability and a bulk resistivity in the range of 108 to 1017 Ω-m, and is preferably in the millimeter to centimeter size range. Multiple balloons may be arranged in parallel or may be individually addressable by the detector electronics.

A method of managing data obtained by measurements. The method permits EDS (energy dispersive spectroscopy) spectra to be collected in one operation. Energies detected by an EDS detector are converted by a pulse height analyzer into pulses of heights corresponding to the energies. The heights of the pulses in a distribution are assigned to multiple channels. The number of pulses in each channel is counted. A data processing circuit sends data blocks to a CPU. In each data block, a tag indicative of being X-ray energy data and the value of energy are combined. The CPU sequentially stores incoming data blocks into a hard disk.

A neutron detector comprises a gas-filled dielectric shell, preferably a glass balloon, having opposite electrodes. An electric field is established whereby ionizing particles may be detected via ionization and current flow in the gas, using a pulse height analyzer or other conventional means. The dielectric shell preferably has low gas permeability and a bulk resistivity in the range of 108 to 1017 Ω-m, and is preferably in the millimeter to centimeter size range. Multiple balloons may be arranged in parallel or may be individually addressable by the detector electronics.

In the wavelength dispersive X-ray fluorescence spectrometer of the present invention, a counting loss correcting unit (11), when correcting a counting rate of pulses determined by a counting unit (10) on the basis of a dead time of a detector (7), stores beforehand a correlation between a predetermined pulse height range, within which pulses are selected by a pulse height analyzer (9), and the dead time and determines the dead time so as to correspond to the predetermined pulse height range during a measurement on the basis of the stored correlation.

The detecting instrument includes a detector with its DC high voltage being supplied by high voltage circuit. The detector is setup inside a shield. There is a slit on base of the shield for ray to enter into. The detector is connected to amplifying and shaping circuit composed of linear pulse amplifier and CR-RC shaping circuit. The amplifying and shaping circuit is connected to pulse height analyzer, which is connected to integrating amplifier controlled by single chip. The integrating amplifier carries out integral amplification for pulse outputted from the pulse height analyzer so as to output proportioned linear signal of voltage to implement conversion between frequency-voltage. The detecting instrument can be connected to workstation of liquid chromatography. Using different adapters of shield, the disclosed instrument can be in use for detection of thin layer chromatography or detection of high performance liquid chromatography. Features are: easy of operation, high sensitivity and resolution.

In the wavelength dispersive X-ray fluorescence spectrometer of the present invention, a counting loss correcting unit (11), when correcting a counting rate of pulses determined by a counting unit (10) on the basis of a dead time of a detector (7), stores beforehand a correlation between a predetermined pulse height range, within which pulses are selected by a pulse height analyzer (9), and the dead time and determines the dead time so as to correspond to the predetermined pulse height range during a measurement on the basis of the stored correlation.

A multichannel pulse-height analyzer circuit based on a LPC1764 is suitable for the detector field, and comprises an analog front end and an A / D conversion circuit, a CPLD on-chip circuit, a USB interface circuit and a power supply protection circuit; the pulse-height analyzer circuit is compact in structure, small in size, stable in work, good in adaptability, low in power, can improve the work efficiency, and has very good interference immunity and reliability.

The invention belongs to the technical field of space radiation effect and strengthening, and particularly relates to an on-track monitoring device and method for space single event burnout effect. The monitoring device comprises a high-voltage direct current programmable power supply, a current-limiting protection resistor RB, a power MOSFET, a charge sensitive amplifier, a logarithmic converter and a pulse height analyzer, wherein the charge sensitive amplifier comprises a current-limiting resistor RL, a feedback resistor RF, a decoupling capacitor CD, a decoupling capacitor CF, a voltage holding capacitor CH and an operational amplifier. The monitoring method can realize the non-destructive testing of space single event burnout, provides a feasible non-destructive monitoring method for further obtaining single event burnout characteristic parameters in a simulated source condition, can comprehensively present characteristic information of single event burnout effect, and provides a reference for space radiation effect protection design.

The invention discloses an energy spectrum measuring system based on a software multichannel pulse-height analyzer. The energy spectrum measuring system comprises a radiation probe, a high-speed acquisition card and a computer, wherein the radiation probe is connected with the computer through the high-speed acquisition card, the radiation probe outputs radiation analog pulse signals to the high-speed acquisition card, the high-speed acquisition card converts the radiation analog pulse signals into radiation digital pulse signals and sends the radiation digital pulse signals to the computer, an energy spectrum acquisition control module, the software multichannel pulse-height analyzer and an energy spectrum display and analyzing module, which are realized based on software, are built in the computer, and the energy spectrum acquisition control module is connected with the high-speed acquisition card and conducts acquisition control and communication management for the high-speed acquisition card. The software multichannel pulse-height analyzer conduct smooth processing for the radiation digital pulse signals based on the three-point smoothing algorithm, analyzes the amplitude of the radiation digital pulse signals by using the five-point peak searching algorithm, and outputs analysis result data to the energy spectrum display and analyzing module for displaying and storing, thereby realizing the purpose of measuring radiation spectrum.

The invention belongs to the technical field of beryllium ore analysis and testing, and particularly relates to a method for in-situ micro-area quantitative analysis of beryllium content, and the method comprises the following steps of: collecting a beryllium ore sample; manufacturing the beryllium ore sample into a probe sheet or a polished thin sheet; identifying beryllium minerals, and thermally evaporating a carbon film on the surface of the probe sheet or polished thin sheet sample; and performing in-situ micro-area quantitative analysis on beryllium minerals. By arranging a light splitting crystal directed at large-size interplanar spacing of ultra-light elements and arranging a pulse height analyzer, in-situ micro-area quantitative analysis of beryllium minerals can be achieved, micron-level nondestructive analysis can be conducted on the beryllium minerals, component information of the beryllium minerals in the micro-area scale can be obtained easily, and by means of the testing method and technology, the method has no complex sample preparation process, and has the advantages of in-situ, micro-area, lossless, real-time, simple and convenient operation, high sensitivity and the like.

The invention provides a rapid detection and display nuclide analyzer, which includes an analyzer body, the analyzer is a cuboid portable analyzer, a display window is arranged on the front, and a plurality of nuclear radiation detector probes are arranged on one of the two bottom surfaces , and the other ground is an expansion interface, which is used to connect long-distance nuclear radiation detectors externally, so that the detection area can be extended; Pulse amplitude analyzer, this method can make on-site rapid detection and preliminary nuclide judgment, and can store data results for subsequent precise detection.

The invention discloses a radon and daughter radioactive equilibrium identification system and method. The radon and daughter radioactive equilibrium identification system includes a radiation probe,a data acquisition card, a power spectrum acquisition control unit, a multichannel pulse-height analyzer, an equilibrium identification and display system, wherein the data acquisition card converts an analog pulse signal of the radiation probe into a digital pulse signal; the power spectrum acquisition control unit controls communication of the data acquisition card; the multichannel pulse-heightanalyzer converts the digital pulse signal into gamma power spectrum count; the equilibrium identification and display system performs data processing on the gamma power spectrum count to obtain theequilibrium coefficient; and according to the value range of the equilibrium coefficient, the radon and daughter radioactive equilibrium state can be provided and displayed. The radon and daughter radioactive equilibrium identification system is simple in structure, and dynamically monitors and identifies whether the radon and daughter in active carbon or other bodies containing radon achieve equilibrium.

The detecting instrument includes a detector with its DC high voltage being supplied by high voltage circuit. The detector is setup inside a shield. There is a slit on base of the shield for ray to enter into. The detector is connected to amplifying and shaping circuit composed of linear pulse amplifier and CR-RC shaping circuit. The amplifying and shaping circuit is connected to pulse height analyzer, which is connected to integrating amplifier controlled by single chip. The integrating amplifier carries out integral amplification for pulse outputted from the pulse height analyzer so as to output proportioned linear signal of voltage to implement conversion between frequency-voltage. The detecting instrument can be connected to workstation of liquid chromatography. Using different adapters of shield, the disclosed instrument can be in use for detection of thin layer chromatography or detection of high performance liquid chromatography. Features are: easy of operation, high sensitivity and resolution.

The invention provides a radiation dosimeter with an alarm device. The inside of the measuring instrument includes a built-in processor, and a wireless communication device, a display module and a power supply are respectively connected to the built-in processor; the nuclear radiation detection device includes a connected NaI Crystal probe, photomultiplier tube, amplifying circuit and digitized pulse amplitude analyzer, the pulse amplitude analyzer is connected to the built-in processor, the measuring instrument of the present invention has high sensitivity and good energy response characteristics, and can be applied to medical treatment, and completion, For areas with high radiation doses such as nuclear submarines and nuclear power plants, at the same time, the measuring instrument is small in size, and the digital display of the dose rate status is more intuitive.

The invention discloses a device and a method for controlling the residual stress on the surface of a metal microstructure. A laser micro shot blasting generation system and a measuring feedback system are respectively connected with a control system; a pulse laser beam is focused on an area to be subjected to shot blasting on the surface of a workpiece; incident X rays emitted by a synchronous accelerating irradiation light source enter a measurement box, are diffracted by the surface of the workpiece and then are received by a detector; electric pulse is amplified by an amplifier and enters a pulse height analyzer; signal pulse is transmitted to a counter, processed by a microcomputer and fed back to a computer control system by the microcomputer for error analysis and parameter correction; and a charge Coupled device (CCD) optical camera is used for positioning and monitoring a processing area on the surface of the workpiece. The invention effectively controls the residual stress on the surface of the metal microstructure, improves the mechanical properties of the metal micro component, prolongs the service life of the metal micro component, and enables the surface of the metalmicro component to generate the residual pressure stress with the depth up to over 20mu m and the pressure ranging from -120 to -100Mpa.

The invention provides a solar X-ray detector with a wide field angle and high energy spectrum resolution. According to the detector, a sun sensor senses that the sun enters a detection field, operation timing sequences of a peak protection circuit and a pulse height analyzer are started, solar X-rays enter a silicon drifting sensor through the detection field formed by a collimator and a diaphragm, and a high-energy electron enters the collimator and deviates from the incident direction under the action of a deflection magnet; electric charge pulses of solar X-ray photons in the silicon drifting sensor are converted, shaped and amplified to form voltage pulse signals through a pre-amplifier, a pulse shaping unit and a main amplifier, amplitude analysis is carried out on the voltage pulse signals through the peak protection circuit and the pulse height analyzer, the voltage pulse signals are sent to a computer A or a computer B of an FPGA master control circuit, the computer A or the computer B of the FPGA master control circuit receives detection data from the high-energy electron and a high-energy proton heavy ion interface circuit at the same time, energy spectrum data of the solar X-rays are processed, stored and coded, and the energy spectrum data are transmitted to a satellite platform through a computer A or a computer B of a coding telemetering interface circuit and a satellite electrical interface.

A X-ray fluorescence spectrometer of the present invention simultaneously generates an analytical pulse-height width profile and a narrow pulse-height width profile that are distributions of intensities of secondary X-rays (7) against scan angles (2θ) set by an interlocking unit (10) on the basis of a differential curve which is output by a multichannel pulse-height analyzer (13), as well as a predetermined analytical pulse-height width for an analytical line that is a primary reflection line and a predetermined narrow pulse-height width that is narrower than the analytical pulse-height width. Identification of the analytical lines is performed for the analytical pulse-height width profile and the narrow pulse-height width profile, and any analytical line identified only in the narrow pulse-height width profile is added to the analytical lines identified in the analytical pulse-height width profile to obtain an identification result of the analytical lines.

The invention provides a radiation dosimeter, wherein the measuring instrument includes a built-in processor, and is respectively connected with the built-in processor to a wireless communication device, a display module and a power supply; the nuclear radiation detection device includes a connected NaI crystal probe, a photoelectric A multiplier tube, an amplifying circuit and a digital pulse amplitude analyzer, the pulse amplitude analyzer is connected to the built-in processor, the measuring instrument of the present invention has high sensitivity and good energy response characteristics, and can be used in medical treatment, and completion, nuclear submarines, nuclear power plants, etc. In areas with high radiation dose, at the same time, the measuring instrument is small in size, and the digital display of dose rate status is more intuitive.