This application note describes the concept of measuring impact of an object using an accelerometer, microcontroller hardware/software and a liquid crystal display. Due to the wide frequency response of the accelerometer from d.c. to 400 Hz, the device is able to measure both the static acceleration from the Earth’s gravity and the shock or vibration from an impact. This design uses a 40g accel...

A single chip integration accelerometer is designed in this paper. By means of a silicon mass, it integrated the measurement of the two kinds of the inertial parameter on a single chip. The paper analyzed the measurement theory of the accelerometer gyroscope. And then some experiment to test the characteristics of the accelerometer gyroscope is introduced. The results show that this design can ...

A subnano-g electrostatic force-rebalanced flexure accelerometer is designed for the rotating accelerometer gravity gradient instrument. This accelerometer has a large proof mass, which is supported inversely by two pairs of parallel leaf springs and is centered between two fixed capacitor plates. This novel design enables the proof mass to move exactly along the sensitive direction and exhibit...

This paper reports a novel GaAs micromachined accelerometer based on the meso-piezoresistive effects of resonant tunneling diodes (RTDs). he sensitive unit of the accelerometer is the RTD which is located at the root of the beams. Based on the meso-piezoresistive effects of RTD, the ccelerometer transduces acceleration into electrical signal output. This kind of accelerometer has been fabricate...

BACKGROUND The aim of this study is to assess the repeatability and validity of the Finnish 11-year old children's out-of-school physical activity (PA) questionnaire using accelerometer as reference method. A sub-sample of children (N = 155, 60 % participant rate) participating in the Finnish Health in Teens study was recruited in 2013. Children completed a questionnaire measuring PA two times,...

Automatic layout generation of a surface-micromachined accelerometer from user-supplied specifications is presented. An accelerometer is an inertial sensor used to measure accelerations. An ADXL76 style accelerometer is chosen as the synthesis topology. The design problem is formulated as a formal non-linearly constrained numerical optimization problem by using the physical dimensions of the de...

BACKGROUND Most accelerometers are worn around the waist (hip or lower back) to assess habitual physical activity. Wrist-worn accelerometers may be an alternative to the waist-worn monitors and may improve compliance in studies with prolonged wear. The aim of this study was to validate the Vivago® Wrist-Worn Accelerometer at various intensities of physical activity (PA) in adults. METHODS Twe...

Researchers have been looking for alternatives of expensive conventional accelerometers in vibration measurements. Micro-ElectroMechanical Systems (MEMS) accelerometer is one of the available options. Here the performance of one of these MEMS accelerometers compared with a well known commercial accelerometer.

The goal of this study is to develop, test, and compare multinomial logistic regression (MLR) and support vector machines (SVM) in classifying preschool-aged children physical activity data acquired from an accelerometer. In this study, 69 children aged 3-5 years old were asked to participate in a supervised protocol of physical activities while wearing a triaxial accelerometer. Accelerometer c...

A triaxial accelerometer was used to evaluate the relationship between energy expenditure due to physical activity (EEact) and body acceleration during different types of activity. In a laboratory experiment, 11 male subjects performed sedentary activities and walked on a motor driven treadmill (3-7 km.h-1). EEact was calculated from total energy expenditure (EEtot), as measured by indirect cal...