Development of a Dust Particle Analyzer for In- situ and Simultaneous Measurements of Size and Charge Distributions of Martian Dust
نویسندگان
چکیده
In this report we present our progress of the NRA 02-OSS-01 project on the development of a prototype Dust Particle Analyzer (DPA) and its performance under simulated Martian atmospheric conditions. Both theoretical analysis assuming the predicted environmental conditions of Mars and experimental data on the development of the DPA show that the instrument has an excellent potential for its application to measure the size and charge distributions of dust particles on the surface of Mars. The instrument covers a size range of 0.5 to 20.0 μm in diameter and charge-to-mass ratio of the particle in the range 0 to ± saturation charge. The measurements are made on individual particle basis at a rate in excess of 100 particles per second. The instrument is made of a Laser Doppler Velocimeter (LDV) and a relaxation cell composed of an aerosol sampling system and an electro-acoustic drive. The aerodynamic diameter and electrostatic charge spectra of the particles are determined in a non-contact manner by LDV measurements of particle motion excited by an electric/acoustic field. The performance of the prototype instrument was tested with JSC-1 Mars dust simulants under both laboratory conditions and in a vacuum chamber at 5 mb to simulate the Martian atmospheric conditions simulated at NASA KSC. Instrument design, development and test data are presented.
منابع مشابه
Compressive and rarefactive dust-ion acoustic solitary waves in four components quantum plasma with dust-charge variation
Based on quantum hydrodynamics theory (QHD), the propagation of nonlinear quantum dust-ion acoustic (QDIA) solitary waves in a collision-less, unmagnetized four component quantum plasma consisting of electrons, positrons, ions and stationary negatively charged dust grains with dust charge variation is investigated using reductive perturbation method. The charging current to the dust grains ca...
متن کاملEffects of aerosols on the observed irradiance from the ultraviolet to near-infrared at the surface of Mars
Introduction: Aeolian dust is the major climate driver component of the Martian atmosphere with variations in dust loading having significant effect on the atmospheric dynamics [1, 2]. So far there have been significant studies on Martian aeolian dust using observations from landers [3, 4], orbiting spacecraft [5, 6] and measurements from the Earth [7]. However, currently lacking is in situ inf...
متن کاملdevelopment of an explicit eulerian method for treating particle laden turbulent flow in dust collectors
متن کامل
The Open University ’ s repository of research publications and other research outputs In Situ Sampling of Relative Dust Devil Particle
During a field campaign in the Sahara Desert in southern Morocco, spring 2012, we sampled the vertical grain size distribution of two active dust devils that exhibited different dimensions and intensities. With these in situ samples of grains in the vortices, it was possible to derive detailed vertical grain size distributions and measurements of the lifted relative particle load. Measurements ...
متن کاملHow different source regions across the Middle East change aerosol and dust particle characteristics
A major question is whether different source regions across the Middle East account for changes in aerosol and dust particle characteristics, which impact Western Iran. Therefore, over a period of sampling from April 2017 to April 2018, dust particles were collected in Western Iran from different cities including Urmia, Sanandaj, Sare-Pole-Zahab, Dehloran and Abadan. The research aim is to comp...
متن کامل