46 results about "Charge sensitive amplifier" patented technology

A data acquisition system includes a charge-sensitive amplifier (CSA) configured to receive a charge from an x-ray detector, the CSA includes a high-gain electronic voltage amplifier, an electrical energy storage device coupled with the amplifier, and an electrical resistor coupled with the amplifier. The data acquisition system includes a baseline sampling circuit configured to receive an output from the CSA and to sample a baseline signal from the CSA, at least one discriminator coupled to an output of the CSA and to an output of the baseline sampling circuit, the at least one discriminator configured to output a voltage if the output of the CSA exceeds a threshold, and a counter coupled to an output of the discriminator and configured to output a digital signal indicative of a photon count received at the x-ray detector and based on the output from the CSA and on the signal from the CSA.

A multi-channel integrated circuit is provided in which each channel has an analog section and a digital section. Each channel of the readout chip employs low noise charge sensitive amplifier at its input followed by other circuitry such as shaper, pole-zero, peak hold, different comparators, buffers and digital control and readout. Each channel produces a self-trigger and a fast timing output. Channel-to-channel time differences are also recorded. Integrated circuit also provides a large dynamic range to facilitate large range of applications. The trigger threshold can be adjusted to provide energy discrimination. The chip has different, externally selectable, operational modes including a sparse readout mode in which only the channels which have received signals greater than a preselected threshold value are read out. The sparse readout mode results in increased data throughput, thus providing fast data acquisition capabilities.

The present invention is an indirect AMFPI wherein a phosphor such as a structured cesium iodide (CsI) is used to convert x-ray energy to optical photons or a charge, which is then detected by a two-dimensional array of either thin-film transistors (TFTs) such as an amorphous a-Se TFTs or a photodiode array. A scanning control circuit generates pulses to turn on the TFTs one row at a time, and thus the charge in the individual arrays is transferred from the TFT to one or more external charge-sensitive amplifiers. The charge-sensitive amplifiers are shared by all the pixels in the same column. The two-dimensional array can be read in real time.

A particle-counting apparatus is described, which reduces a resulting width of pulses when a charge pulse is received from a particle detector, thereby reducing pile-up problems with pulses. Pulse shortening is obtained by resetting the pulse shortly after it exceeds its peak level at the apparatus output. The apparatus includes a charge-sensitive amplifier and a shaper which generates an output for subsequent discrimination circuits. A reset generator monitors the shaper output and generates a reset signal to the shaper when a peak has been detected.

The invention discloses a high-resolution X-ray energy spectrometer based on an Si-PIN detector array. Detectors of the energy spectrometer employ an m row*n column Si-PIN detector array, each row of the detectors share one charge sensitive amplifier, there are n columns all together, X rays detected by the detectors are respectively sent to a time discrimination unit and a signal filtering weighting unit through amplification of the amplifiers, and n time signals and single-path energy signals are formed. Inside a digital multichannel pulse-amplitude analyzer, accurate pulse amplitude is extracted after the time signals and the energy signals are processed by an offline correction module and a trapezoid shaping module, and an energy spectrum of the X rays is finally output. The high-resolution X-ray energy spectrometer has the following advantages: the detection efficiency of the detectors in detecting the X rays especially high-energy X rays is improved, the problem of introduction of quite large noise during application of the detector array under common conditions is solved, the signal-to-noise ratio is improved, and the energy resolution of the X-ray energy spectrometer is effectively improved.

Systems and methods for generating control signal in radiation detector systems are provided. One system includes a scheduling architecture having at least one anode channel connected to a detector of the radiation detector system. The anode channel includes a charge sensitive amplifier and a signal shaper, wherein the anode channel is configured to generate at least one control signal to control data acquisition by the detector. The scheduling architecture also includes at least one shaper timer configured having a time constant to define timing for the generation of the control signal without using a clock.

Embodiments of the present invention provide a computer-implemented method for setting an amplification gain of a pixel array. Specifically, among other things, embodiments of the present invention provide a computer-implemented infrastructure comprising: receiving an electrical signal from an ionizing radiation source at one or more pixel sensors of a plurality of pixel sensors within the pixel array; setting an amplification gain of the electrical signal at a charge sensitive amplifier by turning a switch on or off, wherein the switch connects the at least one or more pixel sensors to a respective capacitor; scanning the pixel array to determine the ionizing radiation source intensity; and generating a gain control signal based on the ionizing radiation source intensity.

A charge-sensitive amplifier is disclosed for use in amplifying signals from a particle detector. This includes a field effect transistor having a gate, source and drain, the gate being connectable, using a gate pad, to the particle detector, for the receipt of said signals. Also included is an amplifier having an input connected to the drain or source of the field effect transistor and an output connected through a feedback capacitor to the gate of the field effect transistor. The gate pad of the field effect transistor is made to be integral with the feedback capacitor so as to reduce the capacitance of the device.

This invention involves a locale multi-channel alphaspectroscopy measuring instrument for radon separation rate and radon concentration, including radon collection devices, semiconductor detectors, charge-sensitive amplifier, the main amplifier, multi-channel analyzer. In the multi-channel analyzer there has USB interface. Through the USB interface the multi-channel analyzer is linked with notebook computers. Through notebook computers we can control alpha continuous spectrum measurement and display the entire spectrum. The measuring instrument of alpha spectrum also adopts on-line and real-time spectrum-stabilizing to stabilize spectrum regulation. At the scene with the conditions of great changes in temperature and humidity, and poor measurements conditions, this invention will still ensure the stability, reproducibility and accuracy of dynamic measurement. The invention can be used in tailings surface, soil, ground, building materials, nuclear facilities places surface radon exhalation rate of -alpharay spectrometry, and can also be used for environmental radon concentration measurement and solving the tailings management-side management measure.

The invention discloses a digital discrimination method for alpha/beta ray. The method comprises the following steps of: after the alpha/beta ray is detected by a detector, outputting a current pulsesignal by a photomultiplier tube, converting the signal by an RC feedback type charge sensitive amplifier to form a double-exponential voltage signal; digitizing the double-exponential voltage signalby a ADC to form a digital pulse signal into a FPGA for processing; eliminating a long exponential decay signal formed by the RC feedback type charge sensitive amplifier by using a current waveform recovery device; setting the width of filters according to the decay time of a ZnS (Ag) and a plastic scintillator by constructing two parallel digital square filters, and processing an output signal ofthe current waveform recovery device; automatically tracking and outputting the peak values for the square filters by peak keepers; acquiring a ratio of the two peak keepers by using a ratio comparator, counting an alpha counter exceeding a set threshold and a beta counter below the threshold, and generating a self-increasing enable signal of the alpha and beta counters after the alpha/beta ray is discriminated; and completing the counting task after the self-increasing enable signal is received.

A multi-radiation identification and dosimetry system and method that allows for monitoring of alpha, beta, and gamma radiation is disclosed. The system/method incorporates a segmented silicon drift detector (SSDD) that allows measurement of directly absorbed radiation in the semiconductor (betas, conversion electrons, Lx lines, and alphas) on one SSDD segment and radiation from a radiation scintillation detector (RSD) on multiple segments of the SSDD. With the anode side of the SSDD directed toward the radiation inspection surface (RIS), the SSDD+RSD stacked radiation detector collects radiation which is processed by a charge sensitive amplifier (CSA) and then processed by a time stamping differentiator (TSD). A computing control device (CCD) may be configured to collect the time stamp differentiation data from the various SSDD segments to permit the simultaneous discrimination of several types of radiation by and presentation of these radiation types and counts on a display monitor.

The invention relates to a lithium glass detector which comprises 6Li glass scintillators, a light guide, optical glass adhesives, reflective layers, a photoelectric converter, an aluminum light shield, an optical coupling agent, a charge sensitive amplifier and a counting processing circuit. The shape of the light guide is a square, six surfaces are polished, five 6Li glass scintillators are pasted to five surfaces of the six surfaces by the optical glass adhesives, the other surface is a light output surface and is connected to a sensitive area of the photoelectric converter with the optical coupling agent, the outer surfaces of the 6Li glass scintillators are coated with the reflective layers, and the reflective layers are coated with the aluminum light shield. The scintillators are 6Li glass flicker piece structures, the thickness of the pieces is 0.5 to 2 mm, and the pulse amplitude of gamma is significantly reduced. The lithium glass detector is suitable for the application ofa direct-reading neutron dosimeter and has the advantages of high neutron detection efficiency, a small size, a light weight, low power consumption and high anti-interference ability.

The invention discloses a cadmium zinc telluride (CdZnTe) X-ray detector for nitrogen thermoelectric cooling. The outside of a CdZnTe detector is provided with a shielding case. A hole is disposed in the shielding case and covered with a double-sided opaque aluminum laminated film. The inside of the shielding case is provided with a thermoelectric cooler. The thermoelectric cooler cools a constant low temperature drive circuit through an external cooler. The CdZnTe detector in the shielding case receives and converts an X-ray into a charge signal, and obtains an ideal nuclear pulse signal after the amplification through a reset type charge sensitive amplifier. The invention has the beneficial effects of eliminating current noises brought by a discharge resistor, improving the signal to noise ratio, and effectively improving the energy resolution of the system.

The invention discloses a gyroscope system and a compensation device for cross coupling and electric coupling thereof. The compensation device comprises a cross coupling compensation module and an electric coupling compensation module, wherein the cross coupling compensation module is positioned in a gyroscope sensor chip, is connected with a gyroscope header, is used for compensating an error caused by a mechanical cross coupling term applied to the gyroscope sensor chip and comprises a first charge sensitive amplifier and a first gain amplifier; the electric coupling compensation module is positioned in the gyroscope sensor chip, is connected with the gyroscope header and is used for compensating an error generated by a parasitic capacitance between a driving feedback electrode and a sensing detection electrode of the gyroscope header; and the electric coupling compensation module comprises a buffer and a second gain amplifier. According to the invention, the mechanical cross coupling term caused by a gyroscope header manufacturing process and an electric coupling term caused by the parasitic capacitance are compensated and interference of the two terms on useful signals is eliminated.

The invention relates to the technical field of logging tools, in particular to a neutron logging tool, including a pulsed neutron source, a detector group, a front-end circuit system for compensating the neutron logging tool, and data for obtaining measured data Analysis module; the detector group includes a first thermal neutron detector, a second thermal neutron detector and a third thermal neutron detector, wherein the first thermal neutron detector is closest to the pulsed neutron source, and the second thermal neutron detector is the closest to the pulsed neutron source. The sub-detectors are far away from the pulsed neutron source, and the third thermal neutron detector is farthest away from the pulsed neutron source; the front-end circuit system includes a charge-sensitive amplifier, a differential amplifier coupled with the charge-sensitive amplifier, a comparator, and a pulse shaping circuit.

The invention discloses a preamplifier with a wide dynamic reading range at the front end of a radiation detector, which is characterized in that the preamplifier can automatically adjust the size ofa feedback capacitor according to the size of an input signal so as to realize automatic adjustment of conversion gain. The preamplifier is composed of a single-ended charge sensitive amplifier CSA, avoltage comparator VCM, a first D trigger D1 and a second D trigger D2. Compared with an existing radiation detector front-end read-out amplifier, the preamplifier has an automatic gain adjustment function, the gain is adjusted to be high when the charge quantity is low, the gain is automatically switched to be low when the charge quantity is high, both the first D trigger D1 and the second D trigger D2 adopt D triggers with asynchronous reset, and a first switch SW1, a second switch SW2 and a reset switch SWR adopt improved transmission gate circuits, so that the influence of a charge injection effect on the circuit is effectively reduced, and the input dynamic range of the front-end read amplifier is expanded.

The invention discloses a read-out ASIC chip for a gas detector and a gas detector. The read-out ASIC chip for the gas detector comprises at least a read-out channel. The read-out channel comprises a charge sensitive amplifier module, a linear discharge module and an over-threshold time measurement module, wherein the charge sensitive amplifier module is used for receiving a charge signal generated by the gas detector and amplifying the charge signal; the linear discharge module is used for carrying out integration on the amplified charge signal and carrying out linear discharge; and the over-threshold time measurement module is used for receiving voltage of the discharge signal of the linear discharge module and carrying out voltage discrimination so as to obtain a pulse width of the discharge signal and a digital signal related to charge quantity of the charge signal generated by the gas detector.

The invention provides a method for digitally correcting attenuation time of a sodium iodide crystal in real time. The method comprises but is not limited to steps that S1, after rays are detected bya detector composed of a sodium iodide crystal and a photomultiplier, the photomultiplier outputs a current pulse signal of an exponential decay function waveform, the signal is defined as I(t), and the decay time constant of the crystal is tau0; S2, after the current pulse signal I(t) is converted by an RC feedback type charge sensitive amplifier, a double-exponential voltage signal is formed, moreover, the bandwidth of an input current pulse signal is reduced, and the signal is defined as V(t); S3, digital sampling of the signal V(t) is conducted through an ADC, and a digital pulse signal V(n) is formed and enters an FPGA to be subjected to digital signal processing. The method is advantaged in that whole process of the method for digitally correcting the attenuation time of the sodium iodide crystal in real time is automatically carried out, and the attenuation time of the crystal changing in a large range is corrected in real time within a wide temperature range; a spectral line drift phenomenon of the energy spectrum measurement equipment caused by crystal attenuation time change is greatly reduced.