Improvement of spectral resolution in the presence of periodic noise and microphonics for hyper-pure germanium detector gamma-ray spectrometry using a new digital filter

Schultz, Michael; Keyser, Ronald M.; Trammell, Rex C.; Upp, D. L.

doi:10.1007/s10967-007-0113-5

Cited by 13 publications

(11 citation statements)

References 1 publication

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“…There are: the applying of band pass filters in input circuits of preamplifier together with selection of the shortest shaping time or input circuits with two shaping times. In some case the digital filters in subsequent blocks of spectrometric signal processing are applied [1][2][3]. To further reducing of microphone effect, more complicated for practical implementation methods of active vibration cancellation are used [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Modal analysis application for the problemof gamma-ray spectrometers resolution improving

Malgin¹,

Jakovļevs²,

Vība³

2019

Vib. proced.

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The cryostat of gamma-ray spectrometer with HPGe detector cooled by Stirling cycle cryocooler is under consideration. The natural frequencies and modes shapes for components involved to oscillatory systems distinguished in dynamic model of cryostat were calculated by Solidworks simulation. The results obtained for the gamma-ray spectrometer "Monolith" produced by BSI, represent its specific modal portrait and allow identification the components of electrical noise due to microphone effect. The absence of resonant amplification due to coincidence between the harmonics of cryocooler operating frequency and the natural frequencies of the cryostat components is an important condition for reducing the influence of microphonics. The results obtained by modal analysis are also useful for assessing the influence of external mechanical disturbances, such as shocks, external vibration or audible noise.

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Section: Introductionmentioning

confidence: 99%

Modal analysis application for the problemof gamma-ray spectrometers resolution improving

Malgin¹,

Jakovļevs²,

Vība³

2019

Vib. proced.

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show abstract

“…In its turn the changes of the capacitances in input circuits of the preamplifier cause electrical interference. This microphone effect (the conversion of mechanical vibrations into electrical signals) reduces the final resolution of spectrometer [1][2][3][4][5][6][7]. Usually, to reduce the influence of microphone effect, the electronic methods are used.…”

Section: Introductionmentioning

confidence: 99%

“…There are as follows -the applying of band pass filters in input circuits of preamplifier together with selection of the shortest shaping time or input circuits with two shaping times [1]. In some cases, the digital filters in subsequent blocks of spectrometric signal processing are applied [2]. It should be noted that electronic methods mentioned above do not provide a sufficient suppression of the microphone effect at the present time.…”

Section: Introductionmentioning

confidence: 99%

Modal analysis of HPGe detector assembly in gamma-ray spectrometers

Jakovļevs¹,

Malgin²,

Vība³

2017

Vib. proced.

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Abstract. The HPGe detector assembly of gamma-ray spectrometer cooled by Stirling cycle cryocooler is under consideration. Modal analysis based on the compiled dynamic model was carried out. The natural frequencies and modes shapes for HPGe detector with relative efficiency 15 % mounted by supports made from composite G-Etronax and CESTILENE HD 1000 were calculated by Solidworks simulation. The frequencies of the axial mode are in range of 200-600 Hz where electrical interferences caused by mechanical vibrations (so-called microphone noise) has a large impact on the resolution of spectrometer. It is shown that for cryostat cap the lowest natural frequencies determined by the thickness of input window lay in higher frequency range. The validity of the adopted model was confirmed by the experiments. The calculated natural frequencies of the detector assembly are compared to the harmonics of cryocooler's vibration. The results obtained are useful to identify the interferences source in electrical circuits of spectrometer at its adjusting.

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“…Mikrofonefekts (mehānisko svārstību pārveidošana par elektriskiem signāliem) pasliktina galīgo gamma spektrometra izšķirtspēju [32], [33], [42], [34]- [41]. Parasti, lai samazinātu mikrofonefekta ietekmi, tiek izmantotas elektroniskās metodes.…”

Section: Att Trokšņa Ietekme Uz Spektrometra Izšķirtspēju Pastiprināšanas Kanālāunclassified

“…Piemēram, joslas filtru pielietošana priekšpastiprinātāja ieejas ķēdēs kopā ar visīsākā veidošanās laika izvēli vai ieejas ķēžu pielietošana ar diviem veidošanās laikiem [42]. Dažādos gadījumos tiek pielietoti ciparu filtri nākamajos spektrometriskā signāla apstrādes blokos [41]. Ir jāatzīmē, ka pašlaik iepriekšminētās elektroniskās metodes nenodrošina pietiekamu mikrofonefekta nomākšanu.…”

Section: Att Trokšņa Ietekme Uz Spektrometra Izšķirtspēju Pastiprināšanas Kanālāunclassified

Dinamisko procesu analīze kriostatos ar elektromašīnu dzesēšanu

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Improvement of spectral resolution in the presence of periodic noise and microphonics for hyper-pure germanium detector gamma-ray spectrometry using a new digital filter

Cited by 13 publications

References 1 publication

Modal analysis application for the problemof gamma-ray spectrometers resolution improving

Modal analysis application for the problemof gamma-ray spectrometers resolution improving

Modal analysis of HPGe detector assembly in gamma-ray spectrometers

Dinamisko procesu analīze kriostatos ar elektromašīnu dzesēšanu

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