Mathematical Physics Analysis of Nozzle Shaping at the Gas Outlet from the Aperture to the Differentially Pumped Chamber in Environmental Scanning Electron Microscopy (ESEM) [PDF]
SensorsA combination of experimental measurement preparations using pressure and temperature sensors in conjunction with the theory of one-dimensional isentropic flow and mathematical physics analyses is presented as a tool for analysis in this paper ...
Jiří Maxa +3 more
doaj +7 more sources
Impact of Supersonic Flow in Scintillator Detector Apertures on the Resulting Pumping Effect of the Vacuum Chambers [PDF]
Sensors, 2023 The article describes the combination of experimental measurements with mathematical–physics analyses in flow investigation in the chambers of the scintillator detector, which is a part of the environmental scanning electron microscope.
Jiří Maxa +3 more
doaj +2 more sources
The Effect of Surface Roughness on Supersonic Nozzle Flow and Electron Dispersion at Low Pressure Conditions [PDF]
SensorsThis study investigates supersonic flow within a nozzle under low-pressure conditions at the continuum mechanics boundary. This phenomenon is commonly encountered in applications such as the differentially pumped chamber of an Environmental Scanning ...
Pavla Šabacká +4 more
doaj +2 more sources
Application of a Total Pressure Sensor in Supersonic Flow for Shock Wave Analysis Under Low-Pressure Conditions [PDF]
SensorsThis study examines the design and implementation of a sensor developed to measure total pressure in supersonic flow conditions using nitrogen as the working fluid.
Michal Bílek +8 more
doaj +2 more sources
Sensors, 2021 Pumping in vacuum chambers is part of the field of environmental electron microscopy. These chambers are separated from each other by a small-diameter aperture that creates a critical flow in the supersonic flow regime.
Pavla Šabacká +3 more
doaj +3 more sources
Methodology for Static Pressure Measurement Under Confined Spatial Conditions in the Low-Pressure Range [PDF]
SensorsThis paper presents a methodology enabling the use of a Pitot probe for static pressure measurement in supersonic flow under severely confined spatial conditions where standard design guidelines cannot be satisfied.
Pavla Šabacká +10 more
doaj +2 more sources
Slip Flow Analysis in an Experimental Chamber Simulating Differential Pumping in an Environmental Scanning Electron Microscope [PDF]
Sensors, 2022 This paper describes the combination of experimental measurements with mathematical–physical analysis during the investigation of flow in an aperture at low pressures in a prepared experimental chamber. In the first step, experimental measurements of the pressure in the specimen chamber and at its outlet were taken during the pumping of the chamber ...
Pavla Sabacká +4 more
openaire +4 more sources
The Impact of Nozzle Opening Thickness on Flow Characteristics and Primary Electron Beam Scattering in an Environmental Scanning Electron Microscope [PDF]
SensorsThis paper describes the methodology of combining experimental measurements with mathematical–physics analyses in the investigation of flow in the aperture and nozzle.
Jiří Maxa +8 more
doaj +2 more sources
Influence of Critical Flow in the Differentially Pumped Chamber AQUASEM
Advances in Military Technology, 2017 The article deals with the effect of the critical flow, which is examined at pumping of the differential pumping chamber of the Environmental Scanning Electron Microscope (ESEM). The article compares the state of the flow in the area of pumped chamber at pressure ratio on the apertures when the critical flow occurs and its advantages in design of the ...
P. Hlavatá +4 more
openaire +2 more sources
A multifunctional beamline chamber featuring diagnostic devices, differential pumping, and laser alignment for endstation optics [PDF]
AIP Conference Proceedings, 2019 The design of a compact chamber incorporating multiple functions for a soft X-ray beamline at Taiwan Photon Source is described. This chamber installed to assist the commissioning of the beamline is composed of three major parts: a diagnostic system, an alignment system and a differential pumping system. The capability of the diagnostic system includes
Yi-Jr Su +6 more
openaire +1 more source