Design overview

Physically, the MIMOS II Mossbauer spectrometer has two components that are joined by an interconnect cable the sensor head (SH) and electronics printed-circuit board (PCB). On MER, the SH is located at the end of the Instrument Deployment Device (IDD) and the electronics board is located in an electronics box inside the rover body. On Mars-Express Beagle-2, a European Space Agency (ESA) mission in 2003, the SH was mounted also on a robotic arm integrated to the Position 

Adjustable Workbench (PAW) instrument assembly. The SH shown in Figs. 3.15 and 3.16 contains the electromechanical transducer (mounted in the center), the main and reference Co/Rh sources, multilayered radiation shields, detectors and their preamplifiers and main (linear) amplifiers, and a contact plate and sensor. The contact plate and contact sensor are used in conjunction with the IDD to apply a small preload when it places the SH holding it firmly against the target. The electronics board contains power supplies/conditioners, the dedicated CPU, different kinds of memory, firmware, and associated circuitry for instrument control and data processing. The SH of the miniaturized Mossbauer spectrometer MIMOS II has the dimensions (5 x 5.5 x 9.5) cm and weighs only ca. 400 g. Both 14.4 keV y-rays and 6.4 keV Fe X-rays are detected simultaneously by four Si-PIN diodes. The mass of the electronics board is about 90 g [36], 

To minimize experiment time, the highest possible source activity is desirable, with the constraint that the source line width should not increase sigiuficantly (maximum by a factor of 2-3) over the 9-12 months duration of the mission. Calculations and tests indicate an optimum specific activity for Co at 1 Ci per cm [42, 43], Sources of 350 mCi Co/Rh with a specific activity close to this value and extremely narrow source fine width ( 0.13 mm s at room temperature), given 

The effective shielding of the detector system from direct and cascade radiation from the Co/Rh source is also very important. A graded shield consisting of concentric tubes of brass, tantalum, and lead was selected. The thickness and the shape of different parts of the shielding were optimized so that nearly zero direct 122 and 136 keV radiation (emitted by the Co source) was in a direct line with the detectors (see Fig. 3.16). 

In addition to the four detectors used to detect backscattered radiation from the sample, there is a fifth detector to measure the transmission spectrum of the reference absorber (a- Fe, a- Fe203, Fc304 see Fig. 3.16). Sample and reference spectra are recorded simultaneously, and the known temperature dependence of the Mossbauer parameters of the reference absorber can be used to give a measurement of the average temperature inside the SH, providing a redundancy to measurements made with the internal temperature sensor (see Sect. 3.3.4). 

---

Olsen, K. W., Batch Fluid-Bed Processing Equipment - A Design Overview Parti f Pharm. Tech., 13(l) 34-46 (1989a)... 

Blood Pressure Lowering Treatment Trialists Collaboration 2000. Effects of ACE inhibitors, calcium antagonists, and other blood-pressurelowering drugs results of prospectively designed overviews of randomised trials. Lancet 355 1955-1964... 

K. W. Olsen, Batch fluid-bed processing equipment. A design overview Part IP, Pharmaceutical Technologyy 6, 39-50 (1989). 

Sam Hariri, lead process engineer, BGCAPP, Process design overview, ... 

Process Design Overview Blue Grass Chemical Agent Destruction Pilot Plant (BGCAPP), Sam Hariri, Lead Process Engineer, BGCAPP. 

Design Overview This section should briefly describe the design of the LAN. It should introduce the basic concepts used in the design, and discuss the rationale of the proposed solutions. The following subsections should be included ... 

CfS-based analyses are also used in facihty location planning, for example, for bioethanol plants [73] or BtL plants [74]. Additionally operations research provides a large toolset for the mathematical characterization, formulation, and solution of facihty location planning problems and supply chain design. Overviews can be found, for example, in [76, 77]. Examples for appHcations to the industrial valorization of renewable raw materials can be found in [39, 40, 78]. Some works combine both approaches (see, e.g., [79, 80]). 

Pitt, D.M. Dunne, J.P. White, E.V. SAMPSON smart inlet design overview and wind tunnel test Part 1 - Design overview. Part II - Wind tunnel test. Proc. SPIE Vol. 4698 (2002), pp. 13-36... 

Session 1 Prometheus Space Reactor Design Overview ... 

---