68 results about "Multichannel analyzer" patented technology

A system for time-correlated photon counting. The system uses one or more photon detectors to produce electrical pulses corresponding to photons read from a target. The system uses a discriminator with a first input coupled to a trigger output from a pulsed optical source and a second input for receiving the electrical pulses. A time-to-pulse height converter is used for producing a series of difference signals each with a respective maxima and whose magnitude is related to the time difference between the trigger output and the electrical pulses. In addition, the system employs a pulse shaping electronic circuit for receiving pulsed electrical output and producing a series of one or more characteristic signals. An A / D converter with a first input receives the difference signals and a second input receives part of the characteristic signals. The A / D converter produces a first series of digital signals representing the difference signals and a second series of digital signals representing the characteristics signals. The results of the A / D converter are feed to a multichannel analyzer for time-shifting the first series of digital signals based on at the second series of digital signals so that the maxima for any given difference signals occurs at the same time as the maxima for at least one other part of the series of the difference signals.

The system has a single pulse spectrum capability for sensing the presence of contamination on a surface to be interrogated. The system includes a narrow frequency bandwidth visible pulse and broadband infrared pulse that are directed to the surface. An output wavelength discriminator receives the reflected sum-frequency that is generated. The output wavelength discriminator is substantially non-transmissive at the frequencies of the visible pulse and the infrared pulse, but is substantially transmissive at the sum-frequency of the visible pulse and the infrared pulse. The output of the wavelength discriminator is a broadband output. A frequency disperser receives the output of the wavelength discriminator and provides a physical separation of output wavelengths of the broadband output. A multi-channel analyzer analyzes the intensity of the physically separated output wavelengths as a function of their physical positions. Thus, a wavelength dependent intensity measurement is provided that is indicative of the presence of contamination.

The invention discloses a device and a method for detecting multiple elements and content thereof in water solution based on a PGNAA (Prompt Gamma-Ray Neutron Activation Analysis) technology, and particularly relates to the device for detecting the content of multiple elements in the water solution by the PGNAA technology. The detection device comprises a sample detection system and an energy spectrum analysis system, wherein the sample detection system comprises an isotope neutron source, a polyethylene wrapping layer and a polyethylene bucket, the isotope neutron source is fixed at the center of the polyethylene wrapping layer, which is at the center of the polyethylene bucket, the energy spectrum analysis system comprises a gamma ray detector, a multichannel analyzer and an industrial control computer, the gamma ray detector clings to the middle high position on the outer wall of the polyethylene bucket, and the gamma ray detector is sequentially connected with the multichannel analyzer and the industrial control computer. Without a large increase in complex equipment, the method and the device can conveniently and accurately detect the content of multiple elements in the solution by the PGNAA technology.

An analytical instrument may have multiple distinct channels. Such may include one or more illumination sources and sensors. Illumination may be delivered to specific locations of a specimen holder, and returned illumination may be delivered to specific locations of a sensor array. Illumination may first pass a specimen, and a mirror or reflector may then return the illumination past the specimen. Optical splitters may be employed to couple pairs of fiber optics proximate a specimen holder. Such channels may further include a plurality of illumination sources positioned on one side of a specimen holder and a plurality of sensors on the other side. The plurality of sensor may capture image of a specimen and a spectrophotometer may concurrently scan the specimen. A plurality of specimens may be imaged and scanned in a single pass of a plurality of passes. Spherical or ball lenses may be placed in an optical path of the illumination to achieve a desired illumination pattern.

A system and method for detecting a milling endpoint on a semiconductor sample by directing an ion beam from a focused ion beam (FIB) apparatus at the sample and using charge pulse detection electronics (CPDE) components to generate a distribution curve on a histogram display. A preferred configuration of the CPDE components includes a charge preamplifier, a pulse amplifier, a pulse shaper, and a multichannel analyzer (MCA).

A digital list mode multichannel analyzer (MCA) built around a programmable FPGA device for onboard data analysis and on-the-fly modification of system detection / operating parameters, and capable of collecting and processing data in very small time bins (<1 millisecond) when used in histogramming mode, or in list mode as a list mode MCA,.

The invention provides a multichannel analyzer for use in a multichannel spectrometer, which comprises a standard spectrum calibrator for obtaining energy calibration parameters of said multichannel spectrometer; an environment background spectrum calibrator for obtaining parameters of a current and a previous environment background spectrum; a peak shift detector for analyzing the parameters of the current and previous environment background spectrum to determine whether a peak shift occurs between them and to determine a correction coefficient of the peak shift; and a parameter corrector for correcting the energy calibration parameters of said multichannel spectrometer using said peak shift correction coefficient. The invention also provides a method for correcting a peak shift of a multichannel spectrometer adapted in the multichannel analyzer. The method for correcting and the multichannel analyzer can correct and monitor the peak shift of the multichannel spectrometer in real time.

An apparatus for determining fluid phase fraction of a multiphase fluid mixture (13) comprises:—a x-ray generator (20) arranged to emit a x-ray radiation spectrum comprising a low energy region and a high energy region, the high energy region including a Bremsstrahlung spectrum;—a pipe section (27) through which the multiphase fluid mixture (13) flows comprising a measurement section (28), said measurement section (28) being coupled to said x-ray generator (20);—a detector (30) coupled to said measurement section (28) and arranged to detect x-ray radiation that has passed through said multiphase fluid mixture (13), the detector (30) being coupled to a multichannel analyzer (32) producing a measurement output comprising a low energy (LE) and high energy (HE) measurement counts; wherein the measurement output further comprises a low energy (LV) and high energy (HV) control counts, in a low energy and high energy control windows located on an edge of the Bremsstrahlung spectrum, respectively; and wherein the apparatus further comprises an electrical parameter control arrangement (33) coupled to the x-ray generator (20) and the detector (30), the electrical parameter control arrangement (33) being arranged to calculate a first ratio of the high energy control count relative to the low energy control count (RV=HV / LV) and a second ratio of the high energy measurement count relative to the low energy measurement count (RE=HE / LE), and to adjust the electrical operation of the x-ray generator (20) based on an electrical parameter control function (FC(V)) of said ratios that minimize a dependence of the electrical operation of the x-ray generator on the fluid phase fraction of the multiphase fluid mixture (13) flowing in the measurement section (28).

The invention discloses a natural gamma-ray spectral logging instrument, which comprises a probe, an operating platform and a winch cable, wherein the probe is connected and communicates with the operating platform through the winch cable, and the probe comprises a detector and an electronics system; the detector comprises a spectrum stabilization device, a detecting element, a photoconductive element, a photomultiplier and a pre-amplification circuit; the electronics system inside the probe comprises an amplifier, a multichannel analyzer, a controller, a memory, a high-voltage power supply and a low-voltage power supply; the detecting element is one of a BGO crystal or a LaBr3 (Ce) crystal; the spectrum stabilization device comprises a shell body and a spectrum stabilization substance arranged in the shell body; and the spectrum stabilization substance is pressed into a pie shape and arranged in the shell body. The natural gamma-ray spectral logging instrument provided by the invention adopts the BGO or LaBr3 (Ce) crystal detector, is high in sensitivity, has good resolution, is internally provided with the natural substance for automatic spectrum stabilization, is convenient to use, and mainly measures gross-count rate caused by natural radioactivity in underground rock and contents and distribution data of natural uranium, thorium and potassium.

A system and method for detecting a substance using x-ray fluorescence is disclosed. The detected substances may be explosives or controlled substances that have a specific chemical fluorescent signature. An energy source transmits an x-ray beam at a target. The target may be in a container or under a surface. The beam interacts with the target to produce fluorescent energy. An x-ray detector is at an angle relative to the energy source and gathers the fluorescent energy. The angle differs according to the physical configuration of the system. A portable embodiment will have a different angle than a stationary embodiment. A cooling mechanism cools the x-ray detector. The fluorescent energy is analyzed and processed by a multichannel analyzer and a computer. The computer determines whether the fluorescent energy from the target matches known fluorescent energies of specific substances. If the substance is detected, appropriate indications are made to prevent damage or acceptance of the substance.

According to the present invention are disclosed a device (3) and a method for generating individual fluid samples (51) for multi-channel analysis, preferably in a diagnostic kit. A fluidic device (3), preferably a microfluidic device, has a plurality of fluidic channels (35). Fluid is transported in the fluid channel. The jumper channel (32) has a fluid inlet (33) and a fluid outlet (34). In use of said device (3), a method is carried out. According to the method, a sample channel is filled to a threshold (39) with sample fluid. A flushing fluid (gas or inert liquid) is then flushed through the sample-filled jumper channel, displacing the sample fluid with the flushing fluid. The inlet and outlet of the bridging channels are then closed and the sample fluid is pushed further into the sequence of channels (30, 31). Alternatively, a suitable pressure may be applied to the fluid such that the fluid is pushed into the sample channel. If it is desired to obtain multiple (time / space) independent sample plugs in the microchannel, the method steps are repeated in an appropriate manner. A series of longitudinally spaced individual sample fluid segments are thus created in each microchannel, separated from each other by a flushing segment.

The invention belongs to the technical field of radioactivity monitoring, and in particular relates to a γ-ray scanning imaging and nuclide identification system and method thereof, comprising an outer casing arranged on a Y-axis turntable, the Y-axis turntable is arranged on the X-axis turntable, and the Y-axis turntable is driven to drive the Y-axis turntable. , the motor driver of the X-axis turntable, the probe with a tungsten shielding shell arranged in the outer casing, the multi-channel analyzer connected with the probe, which also includes a collimator that can be replaced, one end of the collimator is connected to the probe, and there is A collimation hole with a specific collimation angle; a camera and a laser range finder arranged in the outer casing and close to the probe, the axis of the lens of the camera and the laser emitted by the laser range finder are parallel to the axis of the collimation hole; also includes a connection motor The motion control card of the driver connects and controls the camera, laser rangefinder, multi-channel analyzer and the internal computer of the motion control card; it has the advantages of large scanning range, fast scanning speed, and can calculate the actual dose value of each point in the measured area .

The invention discloses X-ray measuring device and measuring method of water content and gas content in a multiphase flow. The measuring device comprises an X-ray apparatus, a computer, a front collimator, a multiphase flow pipeline, a first rear collimator, a detector, a signal amplifier and a multichannel analyzer. The X-ray measuring device and measuring method of water content and gas content in a multiphase flow have high measuring precision, can conveniently and rapidly acquire X-ray signal data penetrating through the multiphase flow pipeline in real time and realize the accurate measurement on a multiphase flow mixing medium according to the principle that different media have different absorbing and scattering conditions on X-rays with different energy.

The invention belongs to the field of material evidence inspection, in particular relates to a method for inspecting paper currency, and uses micro beam XPF to perform non-destructive analysis on an experiment sample. Under the incident micro beam X-ray, a computer software scans a sample by automatically controlling the sample to move continually; characteristic X-ray photons excited by each scan point enter an energy detector, and form a spectrum by being processed through an amplifier and a multichannel analyzer; and a two-dimension element scattergram of the sample is obtained after scanning. Finally, the distribution characteristics of element surfaces of a sample paper currency and a known paper currency are compared to obtain an analysis result. The method has the characteristics of no loss, high sensitivity, accurate result and the like, and has excellent application prospect.

The invention relates to a method of photomultiplier aptitude testing under the vacuum condition: making the circle tubular vacuum tank to connect vacuum system well; putting the CsI crystal in the vacuum tank; putting the photomultiplier on the CsI crystal end surface and coupling well; making the photomultiplier to connect power supply system well; evacuation after covered the sealing coping well; adding the electricity when the vacuum degree achieved the request; placing the 137Cs isotope radioactive source in the vacuum tank base; after the detector adds the electricity and works, pre-amplifier, the main amplifier enlarges the small pulse signal which outputs by the detector and transmits to the multichannel analyzer, obtains the power spectrum curve. The main body of the invention equipment is a circle tubular vacuum tank, there is the voltage transferring part which the electricity tests needs and the bleeder valve above the lap, a valve in the side face connects the vacuum system. The existing technology only can qualitatively test the photomultiplier aptitude. The invention method and the equipment may quantitatively test the photomultiplier gain and energy resolution ratio and so on performance, and can achieve to the purpose of excellent selecting the need photomultiplier.

An apparatus for determining fluid phase fraction of a multiphase fluid mixture (13) comprises: —a x-ray generator (20) arranged to emit a x-ray radiation spectrum comprising a low energy region and a high energy region, the high energy region including a Bremsstrahlung spectrum; —a pipe section (27) through which the multiphase fluid mixture (13) flows comprising a measurement section (28), said measurement section (28) being coupled to said x-ray generator (20); —a detector (30) coupled to said measurement section (28) and arranged to detect x-ray radiation that has passed through said multiphase fluid mixture (13), the detector (30) being coupled to a multichannel analyzer (32) producing a measurement output comprising a low energy (LE) and high energy (HE) measurement counts; wherein the measurement output further comprises a low energy (LV) and high energy (HV) control counts, in a low energy and high energy control windows located on an edge of the Bremsstrahlung spectrum, respectively; and wherein the apparatus further comprises an electrical parameter control arrangement (33) coupled to the x-ray generator (20) and the detector (30), the electrical parameter control arrangement (33) being arranged to calculate a first ratio of the high energy control count relative to the low energy control count (RV=HV / LV) and a second ratio of the high energy measurement count relative to the low energy measurement count (RE=HE / LE), and to adjust the electrical operation of the x-ray generator (20) based on an electrical parameter control function (FC(V)) of said ratios that minimize a dependence of the electrical operation of the x-ray generator on the fluid phase fraction of the multiphase fluid mixture (13) flowing in the measurement section (28).

The present invention relates to an automatic radioactivity analyzer of mixed liquid beta emitter which comprises: a sample preparation part (1, 2, 3, 4, 5, 6, and 7) for extracting a liquid sample from liquid-phase radioactive nuclear wastes; a sample injection part (9 and 10), including a sample transportation part for transporting a bottled sample to a radioactivity detection part to perform measurement; the radioactivity detection part (11) including two photon multiplier tubes; an exterior gamma-ray source injection part (12) for compensating for measurement efficiency according to quenching effects; a signal processing part (13), including a pre-amplifier circuit (14), a high-voltage generator circuit (15), an analogue-to-digital converter circuit (21), and a digital signal processor (DSP) (24), for generating beta spectrums by the aid of a fast coincidence counter (20) and a multi-channel analyzer (22); a main control PC (25) and a graphic user interface (GUI) program (29) for remotely automatically measuring the sample and analyzing the beta emitter; and an Ethernet communication part (28) for performing the remote-control of the analyzer and long-range reception / transmission of the measured data.

The invention discloses a very low-level transuranium nuclide radioactive waste package detection system, which relates to the technical fields of nuclear facility decommissioning and radioactive waste treatment so as to realize effective detection on a radioactive waste package with the alpha specific activity level not reaching the transuranium nuclide un-confinement standard and reduce the influences of uneven nuclide distribution on a measurement result. The system comprises a lead shielding chamber, a lead shielding cover, a copper shielding layer, a system internal cylindrical support unit, a detector assembly, a digital gamma spectrum acquisition multichannel analyzer and a control system, wherein the detector assembly comprises a NaI scintillator, a NaI matched support frame and aphotomultiplier tube. Low-level and even un-confinement-level radioactive waste monitoring, evaluation, classification and the like can be realized, the system is not limited to high-sensitive detection on 239Pu-containing wastes and can be promoted and used in the technical fields of classification, detection and disposal of nuclear power wastes, the minimum detectable alpha specific activity ofa plutonium-containing waste can reach below 85Bq / kg, and key support can be provided for safe disposal and minimized management of the radioactive waste.

The invention discloses a device and method for detecting continuous light emission of a multi-channel optical network unit. The device for detecting continuous light emission of the multi-channel optical network unit comprises a multi-channel relay switch, a multi-channel analyzer and a control unit, wherein the multi-channel relay switch is connected with each optical network unit to be detected and used for controlling turn-on and turn-off of current between each optical network unit to be detected and a power supply; the multi-channel analyzer is connected with each optical network unit to be detected and used for obtaining and outputting the optical power value of each optical network unit to be detected; and the control unit is respectively connected to the multi-channel analyzer and the multi-channel relay switch and used for controlling turn-on or turn-off of the multi-channel relay switch and obtaining the optical power value of each optical network unit to be detected from the multi-channel analyzer, such that whether each optical network unit to be detected is in the continuous light emission state or not can be judged.

A system for assaying a radionuclide includes a liquid scintillation detector, an analyzer connected to the liquid scintillation detector, and a delay circuit connected to the analyzer. A gamma detector and a multi-channel analyzer are connected to the delay circuit and the gamma detector. The multi-channel analyzer produces a signal reflective of the radionuclide in the sample. A method for assaying a radionuclide includes selecting a sample, detecting alpha or beta emissions from the sample with a liquid scintillation detector, producing a first signal reflective of the alpha or beta emissions, and delaying the first signal a predetermined time. The method further includes detecting gamma emissions from the sample, producing a second signal reflective of the gamma emissions, and combining the delayed first signal with the second signal to produce a third signal reflective of the radionuclide.

The invention relates to a Compton scattering experiment simulation system and method. The c Compton scattering experiment simulation system comprises a worktable, a multichannel analyzer, a PC (personal computer) and a worktable control device, wherein the worktable is provided with a simulative radioactive source shielding chamber, a scattering sample bearing unit, a rotator and a simulative nuclear probe, which are sequentially arranged on the same horizontal line; the simulative nuclear probe is electrically connected with the multichannel analyzer, and a lead brick is arranged between thesimulative radioactive source shielding chamber and the scattering sample bearing unit; the scattering sample bearing unit is mounted at one end of the rotator, the simulative nuclear probe is mounted at the other end of the rotator, and the end of the rotator where the scattering sample bearing unit is mounted is coupled to the worktable through the rotating shaft of the rotator; the opposite side walls of the simulative radioactive source shielding chamber and the scattering sample bearing unit are provided with a 137Cs emitting hole and a 60Co emitting hole respectively, and the scatteringsample bearing unit is provided with a scattering sample inserting hole for placing a scattering sample. The Compton scattering experiment simulation system solves the problem of radiation of nuclearradioactive sources, achieves nuclear radiation-free simulative effects and is high in the simulative effects.

The invention discloses a device and method for measuring the flux of fast neutrons, and the method comprises the following steps: enabling the fast neutrons to be converted into secondary neutrons through employing a high-density polyethylene layer and a titanium layer; collecting secondary neutrons comprising characteristic X rays with the titanium energy 4.51keV; analyzing and processing collected signals; analyzing and displaying the flux of outgoing and incoming fast neutrons. A multichannel analyzer is used for receiving the neutrons and the secondary neutrons generated by the high-density polyethylene layer and the titanium layer, and the method measure the flux of fast neutrons through analyzing the number of the full-energy peaks of the characteristic X rays with the titanium energy 4.51keV in the obtained secondary neutrons. The method is high in measurement precision of the flux of neutrons.

A method of using constant pressure air pulse ionization chamber to detect Rn and its alpha energy spectrum includes applying a closed cavity as ionization chamber with constant pressure air pulse, leading Rn gas to be detected into cavity by connected through gas nozzle, fixing collection electrode of excellent conductor in cavity as its output and collection signal being coupled to input end of charge sensitive amplifier, connecting voltage pulse signal in direct ratio of amplitude to incoming alpha energy at output end of said amplifier to multichannel analyzer for obtaining Rn alpha energy spectrum.

The invention discloses an alpha particle noncontact measuring device and method. The alpha particle noncontact measuring device comprises a number of ultraviolet reflection plane mirrors, at least two ultraviolet sensitive photomultiplier tubes, a high voltage module, at least two fan-in and fan-out units, at least two discriminators, a coincidence unit, a multichannel analyzer and a controller. The invention further provides a method using the alpha particle noncontact measuring device to carry out noncontact measurement on alpha particles. According to the invention, the property that the alpha particles produce ultraviolet light in the air is used, and noncontact measurement is carried out on the alpha particles.

The invention provides a coal mine analysis system and method and relates to the technical field of coal mine analysis. The coal mine analysis system comprises an X-ray tube, a filter, a conveying mechanism, a ray detector, a multichannel analyzer and a main control unit, wherein the filter, the conveying mechanism and the ray detector are arranged in the optical path direction of the X-ray tube sequentially; the ray detector, the multichannel analyzer and the main control unit are electrically connected in sequence; the filter is used for filtering X-rays emitted by the X-ray tube, so that the filtered X-rays can enter a coal mine on the conveying mechanism, and excited rays are produced; the ray detector is used for detecting the excited rays; the multichannel analyzer is used for analyzing pulse amplitude of the detected excited rays; the main control unit is used for obtaining content of each component in the coal mine on the conveying mechanism according to the pulse amplitude. Online nondestructive analysis of the coal line can be realized conveniently with adoption of the coal mine analysis system and method, and the system in standby cannot produce harm to a human body or the environment.