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Topic: Accelerometer

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In the News (Tue 21 May 19)

  Accelerometer - Wikipedia, the free encyclopedia
One application for accelerometers is to measure gravity, wherein an accelerometer is specifically configured for use in gravimetry.
Accelerometers are used along with gyroscopes in inertial guidance systems, as well as in many other scientific and engineering systems.
In this case the accelerometers are used to detect the rapid deceleration of the vehicle to determine when a collision has occurred and the severity of the collision.
en.wikipedia.org /wiki/Accelerometer   (439 words)

 Accelerometer Installation
Accelerometers are inertial measurement devices that convert mechanical motion to an electrical signal.
Accelerometers can be supplied with a wide range of sensitivities for special applications such as structural analysis, geophysical measurement, or very high frequency analysis.
An accelerometer's bias voltage is the DC component of the transducer's output signal.
www.reliabilitydirect.com /appnotes/accel.html   (1272 words)

 Accelerometer - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-07)
An accelerometer or gravimeter is a device for measuring acceleration and the effects of gravity.
According to the principles of general relativity, the effects of gravity are equivalent to those of acceleration, so an accelerometer can make no distinction between these effects.
Accelerometers are used in inertial guidance systems, as well as in many other scientific and engineering systems.
www.encyclopedia-online.info /Gravimeter   (113 words)

 Selecting the Optimum Accelerometer for Your Application
An accelerometer senses motion and produces an electrical output proportional to the magnitude and frequency of the input.
The PE accelerometer is treated as a charge generator, and a charge amplifier is used for signal conditioning.
PE accelerometers require more care because they are very sensitive to external contamination due to their high output impedance.
www.evaluationengineering.com /archive/articles/0501data.htm   (1748 words)

 Accelerometer Glossary
Undesired perturbations in the accelerometer output signal which are generally uncorrelated with desired or anticipated input accelerations.
The extent to which the accelerometer's true sensitive axis deviates from being perfectly orthogonal to the accelerometer's reference mounting surface when mounted to a flat surface using mounting screws torqued to 5 inch-pounds.
Accelerometers exported from the United States must be done in accordance with the Export Administration Regulations (EAR) and/or the International Traffic in Arms Regulations (ITAR) as applicable.
www.inertialsensor.com /glossary.shtml   (690 words)

 Accelerometer, Accelerometers
Rieker’s line of accelerometers are available in single, dual, or tri axial packages, with a variety of frequencies and G ranges to suit many different test and control applications.
Our accelerometer sensors are small capacitive spring mass based with integrated electronics, which do not require external amplifiers for a very high resistance to extreme acceleration overloads and shocks.
These accelerometers are available with analog DC, digital pulse-width modulated or frequency- modulated outputs.
www.riekerinc.com /Accelerometers.htm   (146 words)

 Single Degree-of-Freedom Examples: Accelerometer and Seismometer
An accelerometer attached to a larger object can be modeled as a single degree-of-freedom vibration system excited by a moving base.
This is important because the accelerometer can now track the acceleration of the target object directly, without the need for any amplitude corrections.
For modern piezoelectric accelerometers, the damping ratio is close to zero.
www.efunda.com /formulae/vibrations/sdof_eg_accelerometer.cfm   (300 words)

 Accelerometer Mounting Accessories
In high frequency accelerometer applications, it is recommended by the manufacturer to apply a thin coating of Silicone Dielectric between the accelerometer and the mounting surface before mounting the accelerometer to the proper torque.
When an accelerometer is installed in harsh or moist environments, Silicone Dielectric is also recommended for additional sealing of the accelerometer's connector.
Accelerometer mounting studs are used to mount 1/4" thick STI Mounting Pads directly to the tapped bearing housing in combination with epoxy.
www.stiweb.com /proddata/cmcp200series.htm   (955 words)

 Accelerometer | Accelerometers by Honeywell Sensotec   (Site not responding. Last check: 2007-11-07)
Built in signal conditioning in the model MA15, MA321, MA322 and MA52 accelerometers provides a 4-20mA output that is proportional to the RMS vibration value.
Accelerometers are a very common way to measure vibration.
Velocity vibration data can be obtained from the MAV51 and MAV52 accelerometers both of which have built in integration circuits in them.
www.sensotec.com /accelerometers.asp   (357 words)

 Parallax Forums
Accelerometers are already used in a wide variety of machines, specialized equipment and personal electronics.
When you hold the accelerometer level, the hot gas pocket is rises to the top-center of the accelerometer’s chamber, and all the temperature sensors measure the same temperature.
A MEMS (micro electrical mechanical system) accelerometer is insensitive to tilting (other than affecting the axis of measured acceleration), since the MA doesn't measure the tilt it is a "pure" accelerometer and can be used to cancel out the acceleration component from the TA obtain the tilt measurement.
forums.parallax.com /forums/default.aspx?f=6&m=55816   (1729 words)

 Accelerometer   (Site not responding. Last check: 2007-11-07)
In the study of physical systems, it is often desirable to observe the motion of a system and, in particular, its acceleration.
Accelerometers can be described as a combination of two transducers -- the primary transducer, typically a single-degree-of-freedom vibrating mass, or seismic mass, which converts the acceleration into a displacement, and a secondary transducer which converts the displacement of the seismic mass into an electric signal.
As our accelerometer reacts to motion, it places the piezoelectric crystal into compression or tension, which causes a surface charge to develop on the crystal.
bits.me.berkeley.edu /beam/acc_1.html   (172 words)

 IBM Research | People | Mark A. Smith | APS
I was interested in interfacing with the accelerometer from Linux, mostly for the sake of curiosity, but I also wanted to show Amit that his TT can't hold corners as well as my Corolla (and if I could prove it to him using Linux, so much the better).
shockprf.sys interfaces with the accelerometer hardware, while shockmgr.sys subscribes to the data from shockprf.sys and must be the component used to initiate parking of the drive head.
Armed with the read/write sequence that the accelerometer responded to from Windows, the task was now to produce a Linux driver which did the same thing.
www.almaden.ibm.com /cs/people/marksmith/tpaps.html   (2025 words)

 STQC - Accelerometer Calibration
The standard of vibration amplitude is maintained in terms of electrical output of reference accelerometer corresponding to a known value of displacement.
The sensitivity of the reference accelerometer held by the STQC lab is 10 mV±0.05mV/g.
The automated accelerometer calibration System caters to the calibration of vibration transducers over the frequency range of 5Hz to 6kHz with an uncertainty of 2% and an amplitude variation corresponding to 1g to 10g acceleration.
www.stqc.nic.in /calibration/vibrations.htm   (219 words)

 Macsimum News - Buzz: Apple's new accelerometer patent reveals a stunning tablet PC
According to one embodiment of the invention, an accelerometer attached to a portable device detects a movement of the portable device.
According to one embodiment of the invention, an accelerometer of a portable device may constantly or periodically monitor the movement of the portable device.
In one embodiment, the accelerometer 2001 may be a KGF01 accelerometer from Kionix or an ADXL311 accelerometer from Analog Devices.
www.macsimumnews.com /index.php/archive/buzz_apples_new_accelerometer_patent_reveals_a_stunning_tablet_pc   (2076 words)

 Accelerometer Schematic
Below is a rough schematic of the layout of the accelerometer PC board looking from the component side.
The accelerometer itself is a surface mount chip and is thus shown from the bottom on this schematic as if you were looking through the board.
The accelerometer has an external resistor used to select the data rate and external capacitors to smooth the output.
www.randomuseless.info /accelerometer/schematic/schematic.html   (807 words)

 Triaxial Piezoresistive Accelerometer - 5/15/2002 - ECN   (Site not responding. Last check: 2007-11-07)
Endevco's Model 7268B is a miniature triaxial piezoresistive accelerometer (measuring 0.5″× 0.5″× 0.4″) that is suitable for crash testing, flutter testing and other applications requiring minimal mass loading and a broad frequency response.
The accelerometer uses three micro-machined sensors based on the company's proprietary sensor design, which features both high output and high resonance frequency.
With a frequency response extending down to DC (steady state) acceleration, the accelerometer is suitable for measuring long duration transients as well as short duration shocks.
www.ecnmag.com /article/CA216487.html   (233 words)

 Piezoelectric Accelerometer has flexible dynamic range., Endevco Corp.
Signal ground is isolated from the mounting surface of the unit with a supplied hard-anodized mounting adapter.
Accelerometer and cable removal tools are included, ensuring proper removal in the field.
Jul 8, 2002 - Accelerometer weighs 0.2 grams.
news.thomasnet.com /fullstory/18550/rsi   (747 words)

 Saltire Scientific Probes - Low-g Accelerometer
Attach the accelerometer to a dynamics cart, and measure the acceleration as the cart rolls down inclines of different slopes.
Bring the accelerometer and your data logger onto a merry go-round with you.
Attach the accelerometer to a mass on a spring, or a pendulum, and measure the acceleration it oscillates.
www.saltirescientific.com /low_g_accel.html   (97 words)

 PbP Accelerometer Project
Checking the spec sheets for the accelerometer I noted that simply connecting the Vout pin to the offset null pin increases the scale factor for the device by a factor of 2, resulting in a 76 mV/g sensitivity and a +/-- 25 g range.
To make this adjustment the accelerometer is held so that the sensor is parallel to the earth (0 g) and adjusting the potentiometer for an output of 2.5 V from the op amp.
With the gain set to 2.056 the resolution of the accelerometer as converted by the ADC is 0.25 g per count.
www.tfs.net /~petek/rockets/accel/accel.html   (1042 words)

 Accelerometer : FUJITSU EMEA   (Site not responding. Last check: 2007-11-07)
This small and highly sensitive accelerometer can detect acceleration, inclination and vibration by measuring the motion in the x-, y-, and z-axis simultaneously.
The MEMS 3-axis accelerometer consists of a Mass at the centre of the sensor’s chip, which is suspended by 4 Beams doped with Piezoresistive material.
When the sensor is subjected to acceleration in any direction, the movement of the Mass causes the 4 Beams to deform and so change the resistance in the piezo material.
www.fujitsu.com /emea/services/microelectronics/accelerometer   (178 words)

An accelerometer is used to detect vibrations induced on its body, rather than those propagated in air.
Just feed the accelerometer's signal to where your microphone normally connects and drive the speaker with a stimulus signal (with the cal probes sensing the speaker's drive signal).
Measure the result from the accelerometer mounted on the cabinet face you are investigating, rather than from a microphone placed in front of the speaker as you would normally do.
www.libinst.com /accel.htm   (1194 words)

 PASCO Introduces Visual Accelerometer   (Site not responding. Last check: 2007-11-07)
The Visual Accelerometer is a powerful tool for helping middle school through college physics students overcome acceleration misconceptions.
In addition, the Visual Accelerometer can be used as an acceleration sensor when connected to a computer with a PASPORT Interface.
Because the Visual Accelerometer is mounted on the accelerating object, students "see" the acceleration without having to look away at a computer.
www.pasco.com /news/pressrelease/visualaccel.html   (430 words)

 Accelerometer measures vibration on structures., Kistler Instrument Corp.
Kistler Instrument is pleased to announce the release of a new ultra miniature ceramic shear accelerometer type 8778A500 for general vibration measurements on small, light weight structures.
The 8778 accelerometer features a high vibration measurement sensitivity of 10 mV/g with a measuring range of 0 to 500g and a ± 5% frequency response of 2 to 9000
Changes in dynamic response due to accelerometer mass loading is minimized when using the unit.
news.thomasnet.com /fullstory/8289/2399   (814 words)

 Inclinometers, Accelerometers & Inertial Sensors - Jewell Instruments
Most accelerometer designs are rugged enough to withstand severe shock and vibration -- while others include additional ruggedness to make them "all weather" instruments.
Our accelerometers respond to changes in acceleration as small as 1mG., hysteresis less than 0.0005% of full range output and vibration rectification less than 5mg/g2.
The JEWELL LCM accelerometer is a general-purpose acceleration sensor for industrial, commercial and aerospace applications.
www.jewellinstruments.com /accelerometer.htm   (351 words)

 [No title]   (Site not responding. Last check: 2007-11-07)
INTRODUCTION The Accelerometer Accelerometers find their applications in a wide variety of industrial and commercial problems like crash detection for air-bag deployment in cars, vibration analysis of industrial machinery and other inertial guidance systems.
Thus, the accelerometer senses the displacement of the spring caused by the inertia of the accelerated mass.
In order for this accelerometer to be used as a sensor for modeling forces on a car during high-speed crashes, it has to be able to withstand large decelerations and must have a rapid response and a large dynamic response.
www.rit.edu /~asp1822/Accelerometerproject.doc   (2150 words)

 Saltire Scientific Probes - High-g Accelerometer
The High-g Accelerometer is used to measure large accelerations in one dimension.
Hold the accelerometer and jump up and down with it.
Bring your accelerometer into an automobile with you, or onto an amusement park ride and measure the acceleration of these complex systems.
www.saltirescientific.com /high_g_accel.html   (108 words)

 3.3 Accelerometer (Analog Devices ADXL50)
The basic physical principle behind this accelerometer (as well as many others), is that of a simple mass spring system.
This is said to be a single axis accelerometer.
The Analog Devices ADXL50 is a micro-machined stand-alone accelerometer which consists of a mass spring system as well as a system to measure displacement and the appropriate signal conditioning circuitry (which is the topic of the next section).
ccrma.stanford.edu /CCRMA/Courses/252/sensors/node9.html   (706 words)

 News: Emerson introduces new triaxial accelerometer that slashes data collection time for portable vibration analysis ...
New accelerometer delivers data to Emerson's CSI 2130 Machinery Health™ Analyzer for use in improving the identification of bearing faults and improper lubrication
Smaller than conventional triaxial accelerometers, this new sensor delivers excellent measurement quality and faster data collection in the field by technicians using the dual channel CSI 2130 Machinery Health™ Analyzer.
Users gain the full value of the new triaxial accelerometer and CSI 2130 Machinery Health Analyzer when they are used in conjunction with Emerson's AMS™ Suite: Machinery Health Manager software application that makes the condition of critical mechanical equipment readily available to key plant decision-makers.
www.emersonprocess.com /home/news/pr/511_triaxial.html   (603 words)

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