Rotation angle measurement of pedal with ball and socket joint

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SUMMARY

The forum discussion focuses on measuring the rotation angle of a pedal with a ball and socket joint, specifically for an experiment involving a sedated cat. The required precision for angle measurement is 0.25 degrees, necessitating advanced solutions beyond simple graduations. Suggestions include using a coordinate measurement machine (CMM) or a manual CMM arm with encoders, as well as angular magnetic encoders for high-resolution measurements. Participants emphasize the need for lightweight devices to avoid hindering the animal's foot movement during the experiment.

PREREQUISITES
  • Understanding of angular measurement techniques
  • Familiarity with coordinate measurement machines (CMM)
  • Knowledge of angular magnetic encoders
  • Basic principles of biomechanics in animal research
NEXT STEPS
  • Research the specifications and applications of coordinate measurement machines (CMM)
  • Explore the use of angular magnetic encoders for precise angle measurement
  • Investigate lightweight position-sensing devices suitable for animal research
  • Learn about the regulatory requirements for conducting animal experiments
USEFUL FOR

Researchers in biomechanics, veterinary scientists, and engineers involved in precision measurement and animal experimentation will benefit from this discussion.

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  • #32
Hello guys,

I found three inclinometer sensors with the resolution and accuracy required.
the only problem is the weight, which I think can be solved if using the chip without the housing,

I wonder if you have come across these sensors so I can get your feedback.

https://www.gsglobalresources.com/products/control...

Thanks,
 
  • #33
3-axis accelerometers are used in a range of things from aircraft navigation equipment to cell phones.

Sensitivity is often shown as resolution in mG where your ±0.25° translates to 4.4mG, where G is the acceleration of Gravity at the Earths surface.

Here is a link to one source of low cost ones. The drawback is they are just the packaged sensor itself, you have to supply all the electronics to use them. Prices range from USD $1.32 to $178.55 at this distributor, there are others.
https://www.mouser.com/Sensors/Motion-Position-Sensors/Accelerometers/_/N-axgd7?P=1ynyo5tZ1y9irx0Z1ykfg8jZ1yu25cjZ1y9k2dtZ1y9gw93Z1y96oa1Z1yoi99nZ1y8pyzaZ1yyfbu4Z1yoi9b7Z1yq2rrdZ1yq2rrbZ1yzuq36Z1yvt0viZ1yzv7ytZ1yyg66sZ1y9geabZ1yrhbd5Z1yzvsot

(above found with:
https://www.google.com/search?&q=tri+axis+accelerometer+sensor)

Cheers,
Tom
 

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