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|Document Type: ||Thesis or dissertation|
|Title: ||Engineering design instrumentation for life detection planetary exploration missions|
|Authors: ||Juanes-Vallejo, Clara M.|
|Supervisors: ||Cullen, David C.|
|Issue Date: ||Oct-2011|
|Abstract: ||The aim of the research documented in this thesis was to explore issues associated with the
development of instrumentation for life detection and characterisation in a planetary exploration
Within this aim, the following objectives had to be achieved:
1. To consider current and near-future single molecule detection (ultra-low lower limit of
detection) analytical techniques that would be compatible with development into a Space
qualifiable in situ analytical instrument for the detection of biomarkers in a planetary
2. To practically consider the consequences of Planetary Protection and Contamination Control
on the development of a sample return instrumentation in a planetary exploration context.
3. To consider the implications of flying an in situ instrument on-board a stratospheric balloon
platform in order to apply them into a specific planetary exploration mission:
In order to achieve the objectives described above, the following work was pursued:
A desk-based European Space Agency (ESA) study was carried out which entailed producing a
literature review on single molecule detection technologies that had to be validated by the
expert community. This was done by organising an International Workshop on Single Molecule
Detection Technologies for Space Applications in March 2009 at Cranfield University, UK. The
approved technologies then had to be analysed with standard analytical techniques (i.e., tradeoffs)
in order to propose a specific technology for development and present its breadboard
implementation and test plans at the end of the study.
A sample return experiment implementing PP&CC constraints and protocols was designed,
built, tested and flown on-board the ESA, Swedish Space Corporation (SSC), Swedish National
Space Board (SNSB) and German Space Agency (DLR) BEXUS stratospheric balloon platform.
The biological and engineering results obtained from the sample return flight were then
analysed and lessons learnt obtained for future flights.
Another desk-based study was performed to research future stratospheric balloon platforms for
the exploration of Venus’ cloud layer. The in situ instrument previously proposed for the
detection of biomarkers for planetary exploration missions was then put forward as a possible
payload for a Venusian stratospheric balloon platform and approved by experts during the
Venus Exploration Analysis Group (VEXAG) conference held in August 2011 in Washington
The first part of the research involved studying ultra-low lower limit of detection technologies as
these have the potential to impact significantly on the technological and scientific requirements of
future Space missions. Two systems were proposed: one based on Tandem Mass Spectrometry
(with Cylindrical Ion Trap analysers) followed by Surface Enhanced Raman Scattering
spectroscopy to create an MS/MS-SERS instrument for the detection of astrobiology biomarkers in
Martian regolith, Europan ice and samples from Titan’s hydrocarbon lakes; and a second one as a
Stand-Alone SERS system for the detection of biomarkers in Enceladean plumes, Venusian clouds
and cometary coma.
The second part of the research practically explored the design of instrumentation for stratospheric
balloon platforms. CASS•E, the Cranfield Astrobiological Stratospheric Sampling Experiment, was
a life detection experiment that aimed to be capable of detecting stratospheric microorganisms.
The experiment consisted of a pump which drew air from the Stratosphere through a 0.2 μm
collection filter which retained any microorganisms and >0.2 μm particulates present in the pumped
air. Due to the expected rarity of microbes in the Stratosphere compared to the known levels of
contamination at ground level, Planetary Protection and Contamination Control (PP&CC)constraints were introduced. Therefore PP&CC protocols were followed to implement Space
qualified cleaning and sterilisation techniques; biobarrier technology was implemented to prevent
re-contamination of the instrument after sterilisation; and cleanliness and contamination was
monitored throughout assembly, integration and testing.
The third part of the research demonstrated how an instrument from the first part of the study could
be proposed as a payload on-board a stratospheric balloon platform with a focused mission
context, i.e., a life detection mission for Venus. Therefore, the research concluded with the
proposal of a payload for a Venus mission based on SERS technology on-board a stratospheric
balloon platform to search for life above or in the mid Venusian cloud cover.|
|Appears in Collections:||PhD, EngD and MSc by research theses (Cranfield Health) |
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