Stable receiving method for energy of large dynamic range energy spectrum and apparatus therefor

Abstract

Disclosed is a method for receiving energy from wide dynamic range energy spectrum and an apparatus. The inventive method is characterized in employing segment reception of strong signals and weak signals, which means employing rapid response detector for high-strength segmentation and employing multi-channel parallel detector for weak signals beyond high-strength energy spectrum; and performing shift detection for spectrum signals received by rapid response detector and realizing energy reception of the whole spectrum with feedback correction. Two detectors employing the method collect energyspectrum data from different segmentation and level off energy position of spectrum.

Description

technical field [0001] The invention relates to an energy stable receiving method and a device thereof with a large dynamic range energy spectrum, and belongs to the technical field of energy spectrum measurement and analysis methods and instruments. Background technique [0002] Universal Problems and Defects of Existing Energy Spectrum Receiving Technology [0003] In practical applications, we need to collect the energy spectrum of various signals to obtain a large amount of information contained in the energy spectrum. The energy spectrum is obtained by changing the energy distribution of the signal into the spatial position distribution of the relevant signal through the energy analyzer. Under the condition of receiving the energy spectrum, the possible problems are: [0004] (i) The signal intensity of many energy spectra has a large dynamic range, that is, the highest value and the lowest value of the signal intensity in the energy spectrum differ greatly. The detec...

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Problems solved by technology

Practical energy resolution directly limits the study of the fine structure of electron energy loss spectra

[0024] Regardless of the serial or parallel receiving method, the energy resolution of the spectrum is affected by the following factors: 1. The accelerated high voltage of the electron gun source is unstable

2. The power supply of the optical and electronic devices of the spectrometer is unstable

However, this method relies on the condition that zero loss peaks must appear on the CCD, otherwise it cannot provide spectral offset

Moreover, due to the reception of the zero-peak intensity signal, this method cannot realize the linear reception of the energy spectrum with a large dynamic range, that is, the dynamic range of the area array detection element is not enough to characterize the characteristic peak information in the weak signal to be measured

In addition, the information collected by the area array detection element stabilizes the energy spectrum, and the feedback control needs to be implemented after the energy spectrum is collected, and the time for energy spectrum acquisition ranges from several seconds to tens of seconds. This method cannot stabilize the high frequency (several ten Hz) energy drift

[0026] Pieter Kruit and others at the University of Pennsylvania proposed to use a fluorescent screen to detect the position of the zero-loss peak of the electron energy loss spectrum, and the dual photodiode detectors give an electrical signal proportional to the drift of the zero-peak energy position, and amplify this electrical signal as Feedback control compensates energy position drift to stabilize the entire energy spectrum. However, this method only provides the position information of the zero-loss peak, and loses the actual energy spectrum information near the zero-loss peak.

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