I am need this inside my medical device. Maximum of 10 feet variations is enough for me. from 0 to 10 feet if the position changes then that I need check either it is increase in height or decrease height... Digi-key advertised a radar module. The XM132, as I recall. There may be some range limit parameters. What are your distance requirements?
My machine is portableI used Laser sensors for displacement, distance and position but since you mention "without any surface reference. that means there should not be any reflective type of sensor" I will assume LASER sensors are out. Depending on your configuration another option might be the use of a "string pot" also called a YoYo pot or a draw wire displacement sensor. You make no mention of budgetary constraints and the sensors I linked to are high end but much more economical flavors can be found depending on your uncertainty and environmental conditions. There are also other types of sensors to do what you wish to do.
If the accuracy needs to be millimeters, there isnt solutions unless there is reflective surface you can refer to. Inertia sensors can work but they have limitations and it becomes complex very quickly.Dear Team,
I need some sensor that measures the change in height without any surface reference. that means there should not be any reflective type of sensor.
anyone have suggestion?
My machine is portable
I will carry that any where inside the hospital
there should not be any contact outside the machine.
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