NASA Technical Note


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MEMS Barometers Toward Vertical Position Detection: Background Theory, System Prototyping, and Measurement Analysis


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Micro-Electro-Mechanical-Systems (MEMS) sensors constitute perhaps the most exciting technology of our age. The present effort incorporates all the information needed byscientists and engineers who work on research projects and/or product systems, which apply to air pressure acquisition and to its rearrangement into altitude data. Some of the potential implementations of this method (regularly referred to as barometric altimetry) include, but are not limited to, Position Location Application, Navigation Systems, Clinical Monitoring Applications, and Aircraft Instrumentation. This book holds the key to such applications, providing readers with the theoretical basis as well as the practical perspective of the subject matter. At first, the reader is introduced to the background theory, methods, and applications of barometric altimetry. Thereafter, the book incorporates the development of wireless barometers and a (real time monitoring) wireless sensor network system for scheduling low-cost experimental observations. Finally, a deepened understanding to the analysis procedure of pressure measurements (using Matlab script code) is performed.




Blood Pressure Measurements


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In addition to standardized casual blood pressure readings, ambulatory blood pressure monitoring (ABPM) - using automatic noninvasive (= indirect) devices for home readings and fully automated monitors for 24-h profiles - have become a widely used necessary tool in clinical research. This book summarizes the state of the art in the whole field of indirect blood pressure monitoring. It is based on two international meetings and on invited papers. We have divided the subject matter into two main areas: 1) Automatic blood pressure devices for discontinuous registration, and 2) Portable, fully automated programmable monitors for continuous monitoring. The availability of all new technologies is described in detail and current technical and physiological problems have been covered in depth. Both topics have been subdivided into a) Methods and Techniques, and b) Clinical Applications. Both parts are updated and have critically evaluated available automatic sphygmomanometers and portable computers equipped with different techni ques (e. g. , auscultation, oscillometry, plethysmography). Reliability in the intensiv Care unit as well as in outpatients management, common clinical problems, clinical relevance compared to casual blood pressure are described in the first part. In the second part, ten years of experience on fully automated noninvasive methodology - compared to intraarterial techniques - have been elaborated by international experts; the possibilities and limitations are clearly demonstrated. Analyses in different clinical fields in the diagnosis of primary and secondary hypertension are given. Different statistical analyses of blood pressure variability and circadian rhythms are discussed.










Technical Abstract Bulletin


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