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A mechanical pedometer obtained from France was introduced in the US by Thomas Jefferson. [11] It is not known if he modified the design; although this pedometer is widely attributed to Jefferson, [12] [13] proof is difficult to obtain as he did not apply for patents on any of his inventions. [14]
Fitness trackers are a more sophisticated version of the pedometer; in addition to counting steps, they contain additional sensors such as accelerometers and altimeters to collect or estimate measures including the speed and distance travelled, heart rate, calorie expenditure, or the duration and quality of sleep. [2]
An accelerometer measures proper acceleration, which is the acceleration it experiences relative to freefall and is the acceleration felt by people and objects. [2] Put another way, at any point in spacetime the equivalence principle guarantees the existence of a local inertial frame, and an accelerometer measures the acceleration relative to that frame. [4]
For example, a device with an accelerometer can detect rotation from vertical to horizontal state in a fixed location. As a result, accelerometers are primarily used for simple motion sensing applications in consumer devices such as changing the screen of a mobile device from portrait to landscape orientation.
The term recreational vehicle (RV) is often used as a broad category of motor vehicles and trailers which include living quarters for designed temporary accommodation. [1] Types of RVs include motorhomes , campervans , caravans (also known as travel trailers and camper trailers), fifth-wheel trailers , popup campers , truck campers and Park ...
Pages in category "Accelerometers" The following 10 pages are in this category, out of 10 total. This list may not reflect recent changes. ... Cookie statement;
Actigraphs have a number of different ways of accumulating the values from the accelerometer in memory. ZCM (zero crossing mode) counts the number of times the accelerometer waveform crosses 0 for each time period. PIM (proportional integral mode) measures the area under the curve, and adds that size for each time period.
The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact. The HIC can be used to assess safety related to vehicles, personal protective gear, and sport equipment.
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