What is the efficiency of an accelerometer?

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Discussion Overview

The discussion revolves around the concept of efficiency in accelerometers, particularly in their application within smart devices for screen orientation. Participants explore the appropriateness of the term "efficiency" in this context and consider related systems that utilize gravitational potential and other energy sources.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the use of the term "efficiency" regarding accelerometers and suggests that a more relevant inquiry might involve examining datasheets for orientation sensors in cellphones.
  • Another participant expresses concern that the project may be misaligned with the topic if "efficiency" is not the correct term, and seeks clarification on the efficiency of springs.
  • A later reply proposes that the inquiry might relate to energy harvesting from vibrations rather than gravitational potential alone, suggesting that different types of accelerometers could be examined for their energy harvesting capabilities.
  • There is a mention of using small speakers as a potential source for energy harvesting through vibration, with a suggestion to improve efficiency by adding mass to the system.
  • One participant lists examples of systems that might be relevant to the discussion, such as hydroelectric power stations and weight-powered clocks, indicating a broader interest in energy sources beyond just gravitational potential.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the appropriateness of the term "efficiency" in relation to accelerometers, and multiple competing views regarding the focus of the project remain. The discussion includes uncertainty about the correct terminology and the relevance of various energy sources.

Contextual Notes

There are limitations regarding the assumptions about energy sources and the definitions of efficiency as applied to different devices. The discussion does not resolve these issues, leaving open questions about the appropriateness of terminology and the specific applications being considered.

Who May Find This Useful

This discussion may be of interest to individuals exploring the applications of accelerometers, energy harvesting technologies, and the efficiency of various energy systems in engineering and physics contexts.

Tony17
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I 've got a project, and I 've been searching all over to find an answer; what is the efficiency of the accelerometer itself (p.e. in its use in smart-devices as screen-orientation method)?

Or do you know, what is the efficiency (approximately of a regular spring (NOT into void)?

Thank you very much,
Tony
 
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Tony17 said:
I 've got a project, and I 've been searching all over to find an answer; what is the efficiency of the accelerometer itself (p.e. in its use in smart-devices as screen-orientation method)?

Or do you know, what is the efficiency (approximately of a regular spring (NOT into void)?

Thank you very much,
Tony
The word "efficiency" does not seem appropriate here. Maybe a more appropriate question (in the EE forum) would be what is in the datasheet for orientation sensors in cellphones? But then we would just ask you for a link to a typical datasheet... :smile:
 
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berkeman said:
The word "efficiency" does not seem appropriate here. Maybe a more appropriate question (in the EE forum) would be what is in the datasheet for orientation sensors in cellphones? But then we would just ask you for a link to a typical datasheet... :smile:
Thanks for the quick answer :D! You're saving me here! So efficiency is not quite right here huh? That's a problem... My project is asking for analysis of systems/layouts/devices that work using -not exclusively- gravitational potential as an energy source and their efficiency percentage. But if this word doesn't work, maybe I was wrong and the whole device is out of point of the subject? Could you please give me your opinion on this? Also, what about a spring's efficiency?
 
Last edited by a moderator:
Tony17 said:
Thanks for the quick answer :D! You're saving me here! So efficiency is not quite right here huh? That's a problem... My project is asking for analysis of systems/layouts/devices that work using -not exclusively- gravitational potential as an energy source and their efficiency percentage. But if this word doesn't work, maybe I was wrong and the whole device is out of point of the subject? Could you please give me your opinion on this? Also, what about a spring's efficiency?
Oh, it sounds more like you are asking about energy harvesting from vibration? You can't use GPE all by itself as an energy source (at least not as part of an energy cycle with no other work inputs), so you must be looking at vibration?

In that case, you would look at different kinds of accelerometers to see which ones used something like a coil and moving magnet. But that may be hard to find, and you should be looking at small speakers (which use a voice coil around a cylindrical magnet to generate movement). If you vibrate them in the axis of the speaker, you can harvest small amounts of energy from that vibration...

EDIT -- And you could probably improve the efficiency of the speaker vibration harvester by tuning some extra mass that you place at the center of the speaker. Be sure to use a non-ferrous material when adding weight there. Quiz Question -- Why non-ferrous?
 
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Tony17 said:
My project is asking for analysis of systems/layouts/devices that work using -not exclusively- gravitational potential as an energy source and their efficiency percentage.

So do you mean things like:

A hydro electric power station?
Tidal lagoon power station?
Weight powered clock?
 

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