A non-switch weak signal synchronous integration measurement device and measurement method against random noise
A technology of random noise and synchronous integration, applied in measurement devices, using digital measurement technology to measure, measuring electrical variables, etc., can solve problems such as the influence of integrated voltage and the inability to distinguish noise in non-signal periods.
Inactive Publication Date: 2018-11-23
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology
[0003] In order to solve the problem that the existing asynchronous measurement method can only give the overall average value of the signal current and the noise current, and cannot distinguish the noise in the non-signal period, and if the gated integrator is used, it will face the influence of the injected charge of the gate switch on the integrated voltage To solve the technical problem, the present invention provides a non-switchable weak signal synchronous integration measurement method against random noise
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[0060] The present invention will be described in detail below in conjunction with the basic principles of the present invention.
[0061] For the periodic current signal from the detector, assuming that the signal repetition period is T, with an optional moment as the zero point of the time coordinate, the delay is t s After the current signal of interest appears, its duration is set to t w . t in any k-th cycle w In the time range, the signal current intensity is generally a time-domain waveform that first increases and then decreases. Since we only care about the accumulated charge Q of the current sk , for simplicity, the current signal i sk considered as accumulating charge at t w average value in the range. And in the whole cycle, the noise current i nk remains unchanged, so the current signal can be represented by the following function:
[0062]
[0063] Where k=0, 1, 2, . . . represents the number of the kth cycle.
[0064] For the integral circuit shown i...
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The invention brings forward a switch-free weak-signal synchronization integration measurement apparatus and measurement method resisting random noise. In order to realize the purpose of intensity measurement of weak-current pulse signals with a synchronization feature, a typical charge sensitive preamplifier is taken as an integration circuit, and the content comprises a high-precision synchronization gated data acquisition circuit and a data processing algorithm for reducing and deducting random noise. A switch circuit is not arranged in the integration circuit, the influence exerted by injection charge is avoided, and the apparatus and method can be applied to synchronous measurement of weak-current signals of a Faraday detector and the like; it is unnecessary to wait for output stabilization of integration voltages during measurement, the measurement starts at any initial values in a dynamic scope of the amplifier, and the real-time performance is high; and the invention provides a correction method of a synchronization measurement mode and a conventional non-synchronization measurement mode, and free switching between the synchronization and non-synchronization measurement nodes can be realized through arrangement of data acquisition delay time parameters and an algorithm.
Description
technical field [0001] The invention relates to ion detector weak current pulse measurement in the field of mass spectrometry, in particular to a weak signal synchronous integral measurement device and a measurement method resistant to random noise. Background technique [0002] At present, the Faraday cup ion detector is commonly used as the basic ion detection method in mass spectrometers. The main reason is that the Faraday cup ion detector does not discriminate against ions, has good linearity, and has high precision in testing isotope ratios. The preamplifier and data acquisition circuit equipped for Faraday ion detectors generally use high-gain, low-noise preamplifiers and high-precision analog-to-digital converters for asynchronous data acquisition. When faced with the measurement of periodic pulsed ion current, the traditional asynchronous measurement method can only give the overall average value of the signal current and noise current, and cannot distinguish the no...
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IPC IPC(8): G01R19/25
CPCG01R19/2516
Inventor 翟利华何资星邓虎韦冠一徐江袁祥龙李静雅李志明
Owner NORTHWEST INST OF NUCLEAR TECH