Isolated accelerometer measurement systems are used to measure environments composed of a wide spectrum of frequencies including the natural frequency of the isolated accelerometer. Because the isolated accelerometer measurement system is a nonlinear syst...
National Technical Information Service (NTIS)
... EVALUATION OF MULTIPLE ACCELEROMETERS USING A ... IN-HOUSE ACCELEROMETERS USING A MODEL DATA ACQUISITION SYSTEM 5b. ...
DTIC Science & Technology
The patent describes an accelerometer test system using an aluminum rod as a shaker or vibrator for comparing the performance of a test accelerometer with a standard accelerometer. The rod is driven by piezoelectric crystals affixed to its sides. The outp...
... Descriptors : *ACCELEROMETERS, VIBRATION, DETECTORS, AIR CONDITIONING EQUIPMENT, MICROELECTROMECHANICAL SYSTEMS ...
... Descriptors : *ACCELEROMETERS, *CALIBRATION, *PATENTS, SIGNAL PROCESSING, OCEAN WAVES, ACCELERATION, ROTATION ...
... Descriptors : (*ACCELEROMETERS, OPERATION), (*GYROSCOPES, ACCELEROMETERS), SERVOMECHANISMS, NONLINEAR SYSTEMS ...
... (Author). Descriptors : *ACCELEROMETERS, *TORQUE, STABILITY, ANALOG TO DIGITAL CONVERTERS, BIAS, ANALOG SYSTEMS, BINARY ...
... SOUNDING, FALLING BODIES), (*UPPER ATMOSPHERE, DENSITY), (*ACCELEROMETERS, *METEOROLOGICAL INSTRUMENTS), SPHERES ...
... from four satellite accelerometer systems ... re-entry data and contractual ... ACCELEROMETERS, *ARTIFICIAL SATELLITES, DATA BASES, REENTRY ...
... Abstract : A planar eight accelerometer measurement system for determining the three dimensional motion of the pelvis during walking has been ...
It is shown that, although accelerometer control systems are not well-posed in the sense of Salamon,
NASA Technical Reports Server (NTRS)
............................................................................................................ 9 2.2 Accelerometers........................................................................................................................ 11 2.3 Accelerometer ...
E-print Network
... Descriptors : *Scientific satellites, *Accelerometers, *Atmospheric density, *Upper atmosphere, Calibration, Acceleration, Aerodynamic drag, Data ...
... for a mobile autonomous robot is presented. ... A new robot world modeling and path ... ACCELEROMETERS, *COMPUTERS, *ROBOTS, *NAVIGATION ...
... Accession Number : ADA409915. Title : Frequency Response Evaluation of Multiple Accelerometers Using a Modal Data Acquisition System. ...
An examination is made of several methods of approximating an omnidirectional response from an array of uniaxial accelerometers. Several electronic circuits that process the output signals from the accelerometers are described. Each system is analyzed for...
An extensive series of measurements was made of the performance of a particular model of an inertial road profiling system (IRPS), including evaluation of the noncontact height sensors, the accelerometers used to establish the inertial reference frame, th...
An experimental and analytical study was made of an acoustic location system for use with double wall tube steam generators. A conceptual design of an acoustic leak location system was developed. This system has the potential for detecting the third fluid gas escaping from the annulus between the double walled tubes into the sodium. ...
DOE Information Bridge
The design of a Self-Diagnostic (SD) accelerometer system for the Space Shuttle Main Engine is presented. This retrofit system connects diagnostic electronic hardware and software to the current M6 accelerometer system. This paper discusses the general op...
Scientists performing experiments in the unique microgravity environment of space frequently require an accurate and useful view of the acceleration at their experiment. Payload Systems has developed a Microgravity Accelerometer System for use in the Spac...
This low-cost, portable, and simplified system overcomes facility restrictions and can improve calibration quality of accelerometer-based instruments.
NASA Website
... Title : Data Processing Systems for Accelerometer Experiments on Air Force Satellites. Descriptive Note : Final rept. 7 Jun 76-30 Apr 79,. ...
The passive accelerometer system (PAS) is a simple moving ball accelerometer capable of measuring the small magnitude steady relative acceleration that occurs in a low earth orbit spacecraft due to atmospheric drag and the earth's gravity gradient. The ac...
A triaxial-accelerometer system will be included in each of the Atmosphere Explorer (AE) payloads, The instrument consists of three uniaxial miniature-electrostatic-accelerometer units mounted mutually at right angles. This paper provides a description of...
... Descriptors : (*VIBRATION, *RECORDING SYSTEMS), ACCELEROMETERS, VIBRATORS(MECHANICAL), CATHODE FOLLOWERS, GUIDED ...
Engineering model accelerometers have been assembled and tested to assess their potential for use in future strapped down inertial systems. The accelerometer concept investigated uses vibrating quartz crystal beams as the basic force sensing element. This...
The Sundstrand Q-Flex Accelerometer has undergone a short-term investigation to provide information for assessing the applicability of this accelerometer for strapdown inertial navigation systems. The investigation included tests to determine model equati...
The DIAX torsional accelerometers have been repackaged for borehole use. The basic sonde system is presently designed to operate at a pressure equivalent to a depth of 3000 feet of water. It should be noted that the DIAX accelerometers provide true broadb...
Self Diagnostic Accelerometer. Roger Tokars & John Lekki (NASA GRC). National Aeronautics and Space Administration www.nasa.gov ...
When the accelerometer system is subjected to accelerations with components ... can deactivate the accelerometer in cases of insufficient supply voltage, ...
Jul 16, 1999 ... The objective of the passive accelerometer system (PAS) is to measure, at various locations in the spacecraft, the small (10-6 mg) ...
All accelerometers have a 'proof mass' and it is the tendency of the proof ... The principal accelerometer used in the aerobraking analysis is the z-axis ...
Accelerometers, under a variety of names (e.g., vibration, motion, and seismic sensors), serve as sensing elements in a number of systems. The sensing schemes are numerous (mechanical, electric, magnetic, and piezoelectric, for example) and the choice is ...
... Title : Counting Accelerometers (An Error Analysis),. Corporate Author : AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OHIO. ...
... Accession Number : ADA033002. Title : Atmosphere Explorer MESA Accelerometer Data Processing System. Descriptive Note : Final rept. ...
Apr 21, 2011 ... The Accelerometer Recording Unit (ARU) is a system used to detect head movements and measure skin pallor and temperature of the subject ...
... Report Date : MAR 1973. ... After boring six MK 19 5 inch/54 barrels, it was proven that the accelerometer guidance system was accurately guiding the ...
... Abstract : We analyze the possibility of using arrays of accelerometers as Inertial Navigation Systems (INS) for Unmanned Aerial Vehicles (UAV). ...
New technology has been developed for mass-producing electro-mechanical systems using micro machining of silicon wafers. This technology is known as Micro-Electro-Mechanical Systems (MEMS). The geophysical equipment manufacturer, Input Output of Houston, TX, has developed an accelerometer element using MEMS. Refraction Technology ...
NASA Astrophysics Data System (ADS)
... of gravitation and inertia by a combined accelerometer-gradiometer system, with ... to the use of gradients for the determination of the gravity field and ...
... Descriptors : *DATA PROCESSING, *ACCELEROMETERS, *ELECTRONIC RECORDING SYSTEMS, VIBRATION, AIRBORNE, POWER SPECTRA ...
... Descriptors : *ACCELEROMETERS, *ANALOG SYSTEMS, *LOADING, *SEISMIC WAVES, *STRUCTURES, *VIBRATION. ...
... Descriptors : *ACCELEROMETERS, *SERVOMECHANISMS, SERVOMECHANISMS, NONLINEAR SYSTEMS, GYROSCOPES, FEEDBACK ...
ACCELEROMETER-BASED GESTURE RECOGNITION VIA DYNAMIC� TIME WARPING, AFFINITY PROPAGATION system based primarily on a single 3-axis accelerometer. The system employs dynamic time warping of training samples and with the other accelerometer-based gesture recognition systems ...
GesText: Accelerometer-Based Gestural Text-Entry Systems Eleanor Jones1 , Jason Alexander1@cs.manitoba.ca ABSTRACT Accelerometers are common on many devices, including those required for text-entry. We investigate with accelerometers. Prelimi- nary studies provide insight into two potential text-entry designs that ...
Epoch Engineering, Incorporated (EEI) has completed a series of vibration measurements comparing their newly-developed Robust Laser Interferometer (RLI) with accelerometer-based instrumentation systems. EEI has successfully demonstrated, on several pieces of commonplace machinery, that non-contact, line-of-sight measurements are practical and yield results ...
Energy Citations Database
transducers to be used: 1. Strain gages; 2. Piezoelectric accelerometers & power sources; and 3. MEMS (Microelectromechanical Systems) accelerometers. Structure of interest and fixtures: 1. Aluminum beam; and 2. C-clamp. DAQ accelerometers: Piezoelectric accelerometers require a constant ...
PEM-ID: Identifying People by Gait-Matching using Cameras and Wearable Accelerometers Thiago-making. In this paper, we describe the PEM-ID system, which uniquely identifies people tagged with accelerometer nodes from the video by pairing them with a wearable accelerometer node. I. INTRODUCTION In this paper we
of the instrument is sensed by a new magnetometer-aided all- accelerometer inertial measurement unit (IMU). The sensing system consists of three dual-axis miniature accelerometers and a three-axis magnetometer.1.3 Conventional vs All-Accelerometer Inertial Measurement Unit.............. 14 2.2 Magnetometer-Aided ...
) based on accelerometer sensor data. Using this system, a robot actively "knocks" on a surface with an accelerometer-equipped device (e.g., hand or leg), collects the accelerometer data in real approach based on accelerometers to characterize and classify the physical properties of a given ...
The accelerometer type wave recorder, used for the Wave Climate Study of the Great Lakes and the Gulf of St. Lawrence was originally designed by the Bedford Institute of Oceanography. Several modifications have been implemented to the accelerometer during...
A novel fiber-optic tip accelerometer based on Fabry-Perot (F-P) interferometer is proposed and demonstrated, with potential to operate under high temperature, in this paper. Such a tip accelerometer is directed fabricated on a large cladding fiber end by using the 157nm laser-micromachining technology. With the calibration of a micro electro mechanical ...
A planar eight accelerometer measurement system for determining the three dimensional motion of the pelvis during walking has been developed in this study. Literature reviews are given for: previous studies of pelvic motion, kinematic measurement systems ...
A navigation system for a mobile autonomous robot is presented. The navigation system is based upon a directional gyroscope and a single axis accelerometer which enables a robot to navigate independent of wheel optical shaft encoders and other commonly us...
Page 1. I , AD-784 944 AGARD FLIGHT TEST INSTRUMENTATION SERIES. VOLUME 6. OPEN AND CLOSED LOOP ACCELEROMETERS ...
... Accession Number : AD0784944. Title : AGARD Flight Test Instrumentation Series. Volume 6. Open and Closed Loop Accelerometers. ...
A new thermospheric wind measurement technique is reported, which is based on a satellite electrostatic triaxial accelerometer (SETA) system capable of accurately measuring accelerations in the satellite's in-track, cross-track, ad radial directions. Cros...
Accelerometers can be used to monitor physical activity in the home over prolonged periods. We describe a novel system for objectively and continuously monitoring movement, suitable for patients with chronic diseases including congestive heart failure and...
A piezoelectric triaxial accelerometer system has been evolved for use in satellite based neutral air density measurements. Piezoelectric bimorphs are heavily loaded with masses that are clamped at sealevel and are released in orbit by the use of pyrodevi...
May 31, 2011 ... TITLE AND SUBTITLE: A Self-Diagnostic System for the M6 Accelerometer AUTHOR(S): Flanagan, Patrick, M.; Lekki, John REPORT DATE: 2001-11-01 ...
... Descriptors : *Patent applications, *Pressure transducers, *Plastic deformation, *Accelerometers, Pins, Annealing, Copper, Wiring diagrams, Armor ...
... computers, Tape recorders, Magnetic recording systems, Accelerometers ... Portable equipment, Schematic diagrams, Information retrieval, Australia. ...
... Transducers, *Seismometers), (*Velocimeters, Ground motion), Accelerometers, Seismic data, Signal processing, Pendulums, Damping, Oils ...
During Centaur launch operations the launch azimuth of the inertial platform's U-accelerometer input
... and sense the true inertial angular velocity, the uncompensated accelerometers ... The effect of different gravity models on the navigation errors �I ...
... (rh). Descriptors : *FIBER OPTICS, ACCELERATION ... ENVIRONMENTS, GUIDED MISSILES, HIGH ... SYSTEMS, OPTICAL INTERFEROMETERS ...
... Return signals from the fiber optic laser are provided to an interferometer and analysis circuitry. In the absence of a transducer, the system ...
... temperature, suit temperature, activity monitor, and ECG). ... PROTECTIVE CLOTHING, *RADIO TELEMETRY, ACCELEROMETERS, CHANNELS ...
... & Partitioning into functional entities to facili- as a navigation system. ... inertial platform. ... Kearfott Model 2401 accelerometers. See Table 2 ...
... Data bases for on-board experiments such as photometers, spectrometers, accelerometers, particle detectors, and magnetometers have been ...
... has been proposed, .includiag propulsion systems, accelerometers ... applied magnetic field we found fairly close ... The shift in the resonant frequency ...
and tethered struc- tural monitoring systems employ accelerometers to measure the vertical response of the bridge span. Accelerometers are installed within the interior spaces of the Geumdang Bridge's concrete 393B12 piezoelectric accelerometers are the first set installed with the tethered monitoring ...
An accelerometer telemetry system incorporated in a finger ring is used for monitoring the motor responses of a subject. The system includes an accelerometer, battery, and transmitter and provides information to a remote receiver regarding hand movements of a subject wearing the ring, without the constraints of ...
Numerous investigations have studied the potential for chaotic vibrations of nonlinear systems. It has been shown for many simple nonlinear systems, that when they are excited severely enough, or with the appropriate parametric combinations, that they will execute chaotic vibrations. The present investigation considers the potential for the occurrence of ...
The Materials Science Laboratory-2 (MSL-2) mission flew the Marshall Space Flight Center-developed Linear Triaxial Accelerometer (LTA) on the Space Transportation System (STS) 61-C Shuttle mission launched January 21, 1986. Flight data were analyzed to ve...
Microelectromechanical systems in MEMS is one of the fastest growing technologies in microelectronics, and is of great interest for military and aerospace applications. Accelerometers are the earliest and most developed representatives of MEMS. First demo...
An accelerometer based on a spring-suspended reference mass and its precise relative motion measurement by means of 3 two-dimensional position sensitive detectors (PSD) is described. A breadboard model achieves a resolution (longterm linearity) of 25 nm i...
The model of an ideal spatial Newtonmeter (accelerometer) set on a moving object is examined. The relationship of this model and the combination of three real single-component (linear) Newtonmeters with noncoplanar axes of sensitivity in the system of ine...
This report summarizes the data processing required to systematically extract scientifically meaningful data from the accelerometer experiment flown aboard the Atmosphere Explorer series of satellites. Many of the results given will be incorporated by ana...
This report documents the results of the development, fabrication, and testing of two Angular Reference Systems consisting of two Dual Axis Rate Transducers, one Three-Axis Angular Accelerometer, and the associated electronics required to provide the outp...
A self-mixing (SM) laser displacement sensor coupled with a microelectromechanical system (MEMS) accelerometer is presented that enables reliable displacement measurements even in the case of a nonstationary laser head. The proposed technique allows the use of SM-based sensors for embedded applications. The system resolution is ...
PubMed
In this paper, an economical and highly sensitive optical accelerometer using a commercial optical pickup head is proposed. In the proposed design, the moving part of a voice coil motor (VCM) built in the DVD pickup head is used as the seismic mass which combines with the optical system of the DVD pickup to form an accelerometer. This ...
system under difficult dynamic load conditions. In ... accelerometer-based system under dynamic. conditions. Commercial active-target systems have ...
A new family of microminiature sensors and clocks is being developed with widespread application potential for missile and weapons applications, as biomedical sensors, as vehicle status monitors, and as high-volume animal identification and health sensors...
Several wearable computing or ubiquitous computing research projects have detected and distinguished user motion activities by attaching accelerometers in known positions and orientations on the user�s body. This paper observes that the orientation constraint can probably be relaxed. An estimate of the constant gravity vector can be obtained by averaging ...
An accelerometer is described which uses a rf niobium-on-sapphire resonator as its sensor element. The accelerometer uses a magnetically levitated spool as a test mass and the spool modulates the inductance of the resonator; its position is servo controlled to maintain the resonator at the external rf excitation frequency. The ...
Experimenters in ground motion studies rely heavily on a mechanically integrating velocity transducer which uses a pendulum suspended in oil. The transfer function of this velocity gage is compared to the transfer function of a typical accelerometer. The deviation of the velocity gage from the linear model introduces considerable error in the final result. A new technique of ...
Computational Core (Microcontroller) In-System Programmer Flash/EEPROM Memory 16 Bit Bus AD Accelerometer ADXL on-board sensing transducers (i.e. accelerometers), but they will also take part in the task be used in the monitoring of structures. Some examples include strain gages, accelerometers, velocity
-micromachined, capacitive sensing element. CONTROL SYSTEM DESIGN STUDY FOR A MICROMACHINED ACCELEROMETER Michael Kraft: In this paper an analogue, closed loop accelerometer based upon a bulk-micromachined, capacitive sensing element hardware prototype. Keywords: Accelerometers, Microsystems, Control Theory, Closed ...
. Accelerometer systems with self- testable features. Sensors and Actuators, 20, pp. 153-161, 1989. [3] Allen, H. V., Terry, S. C. and Knutti, W. Understanding silicon accelerometers. Sensors, pp. 1-6, 1989. [4. and Howe, R. T. Surface micromachined accelerometers. IEEE Journal of Solid-State Circuits, Vol. 31, No. ...
The answer to the question of the title is a qualified yes: not directly, nor always, nor completely. A review of the measurement principles of gravimeters, accelerometers, and gravity gradiometers shows that, strictly speaking, only the gravity gradiometer senses the presence of a gravitational field. Only under particular circumstances can measurements made with a gravimeter ...
Surface Micromachined Resonant Accelerometer Ashwin A. Seshia, Member, IEEE, Moorthi Palaniapan, Trey A--This paper describes the operation of a vacuum pack- aged resonant accelerometer subjected to static accelerometers is shown to degrade 20 dB/decade beyond a cer- tain characteristic acceleration corner frequency
Until recently, accelerometer manufacturing appeared to be a reasonably mature field. But, this situation changed rapidly when researchers began to build miniature accelerometers using micron scale lithographic techniques developed for producing integrated circuits. Several micro- electro-mechanical systems (MEMS) ...
The integration of MEMS, SAW devices and required microelectronics and conformal antenna to realize a programmable wireless accelerometer is presented in this paper. This unique combination of technologies results in a novel accelerometer that can be remotely sensed by a microwave system with the advantage of no power requirements at ...
This research implements wireless accelerometer sensor module and algorithm to determine wearer's posture, activity and fall. Wireless accelerometer sensor module uses ADXL202, 2-axis accelerometer sensor (Analog Device). And using wireless RF module, this module measures accelerometer signal and shows the signal ...
In the frame of Cosmic Vision selection, one resolution from the Fundamental Physic Advisory Group of ESA was to use an accelerometer on a future Solar-System mission. This paper described such accelerometer which can be implemented in the future Laplace or Tandem mission pre-selected by ESA. Space Fundamental Physic experiments ...
INS (Inertial Navigation System) - A self-contained navigation system. It consists of gyroscopes and accelerometers to provide attitude, heading, position , ...
This sheet describes a mobile test van which allows engineers to conduct vibration testing on wind turbines anywhere in US. It houses a computer system and test equipment (96 accelerometers, shaker system, etc.).
Micro-electro-mechanical systems (MEMS) inertial sensors such as accelerometers and rate gyros have become well- established components in certain ...
... Abstract : A new vibration data analysis system for processing accelerometer power spectral density (PSD) data computed on an existing spectral ...
