Particle transport and distribution on the Mars Science Laboratory mission: Effects of triboelectric charging

被引：15

作者：

Anderson, Robert C. ^{[1
]}

Beegle, Luther W. ^{[1
]}

Peters, Gregory H. ^{[1
]}

Fleming, Gerald M., II ^{[1
]}

Jandura, Louise ^{[1
]}

Kriechbaum, Kristo ^{[1
]}

Manatt, Kenneth ^{[1
]}

Okon, Avi ^{[1
]}

Pounders, Erik ^{[1
]}

Sollitt, Luke ^{[2
]}

Sunshine, Dan ^{[1
]}

机构：

[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[2] Northrop Grumman Aeronaut Syst, Sensors & Instruments Dept, Redondo Beach, CA 90278 USA

来源：

ICARUS | 2009年 / 204卷 / 02期

基金：

美国国家航空航天局;

关键词：

Mars; Surface; Instrumentation; Experimental techniques; SIMULANT; DISSIPATION; AIR;

D O I：

10.1016/j.icarus.2009.07.006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the nature of fine particle (<150 mu m) transport under simulated martian conditions, in order to better understand the Mars Science Laboratory's (MSL) sample acquisition, processing and handling Subsystem (SA/SPaH). We find that triboelectric charging due to particle movement may have to be controlled in order for successful transport of fines that are created within the drill, processed through the Collection and Handling for In situ Martian Rock Analysis (CHIMRA) sample handing system, and delivered to the Sample Analysis at Mars (SAM) and Chemistry and Mineralogy (CheMin) instruments. These fines will be transferred from the surface material to the portioner, a 3 mm diameter, 8 mm deep distribution center where they will drop similar to 2 cm to the instrument inlet funnels. In our experiments, movement of different material including terrestrial analogs and martian soil simulants (Mars Mojave Simulant - MMS) resulted in 1-7 nanocoulombs of charge to build up for several different experimental configurations. When this charging phenomenon occurs, several different results are observed including particle clumping, adherence of material on conductive surfaces, or electrostatic repulsion, which causes like-charged particles to move away from each other. This electrostatic repulsion can sort samples based upon differing size fractions, while adhesion causes particles of different sizes to bind into clods. Identifying these electrostatic effects can help us understand potential bias in the analytical instruments and to define the best operational protocols to collect samples on the Surface of Mars. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：545 / 557

页数：13

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