Abstract
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.
Highlights
Spectrometers based on High Purity Germanium (HPGe) detectors are widely used for radiation monitoring
Modal analysis based on the compiled dynamic model of cryostat for gamma-ray spectrometer “Monolith” was carried out
The modes of cryostat components calculated by Solidworks simulation made it possible to determine the most probable domains for resonant amplification of vibration generated by the cryocooler
Summary
Spectrometers based on High Purity Germanium (HPGe) detectors are widely used for radiation monitoring. Mechanical vibrations inherent for cryocoolers are the cause of electrical noise induced at the preamplifier input by microphone effect (the conversion of mechanical vibrations into electrical signals). This fact reduces the final resolution of spectrometer. The most significant for the appearance of microphone effect is the probable resonant amplification of vibrations generated by cryocooler in the oscillatory systems formed by the components of spectrometer. In this case, the resolution of the spectrometer can degrade significantly. The essence of the approach for identifying noise signals caused by the microphone effect, as well as the results of modal analysis of the cryostat are presented
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
