Hi ,

I have been looking for rotary position sensing device (might be angle measuring Device)
I Don't want to use any magnet (Hall effect sensors)..so help me with Inductive or capacitive angle measuring device if available.

-Santhakumar.

 

Googling 'optical rotary encoder' will find you some.

 

You might also look at capacitative encoders, such as the AMT/CUI ones: http://www.cui.com/amt-modular-encoders

If you search on mechanical encoders (e.g., at DigiKey), you will find a lot of inexpensive ones. CUI makes the too.

John

 

Hi ,

I have been looking for rotary position sensing device (might be angle measuring Device)
I Don't want to use any magnet (Hall effect sensors)..so help me with Inductive or capacitive angle measuring device if available.

-Santhakumar.

A potentiometer with a linear-taper makes a great and simple angle measuring device. Simply connect the two static legs to positive and ground reference - then measure the wiper pin to get your angle as the pot is turned. The higher the pot quality, the better performance is possible.

 

Hi ,

I have been looking for rotary position sensing device (might be angle measuring Device)
I Don't want to use any magnet (Hall effect sensors)..so help me with Inductive or capacitive angle measuring device if available.

-Santhakumar.

Through how many degrees of rotation and with what precision?

 

Through how many degrees of rotation and with what precision?

At least 180 degrees.I want it to be contactless. Precision can be 5 degrees

 

If you tell us exactly what you are trying to measure the rotational angle of, we can give better suggestions.

 

At least 180 degrees.I want it to be contactless. Precision can be 5 degrees

The capacitative sensors are contactless and well more accurate than 5°. Since you mention "angle measuring device" a simple accelerometer will give angles relative to Earth well within your 5° criterion. It is a simple calculation to find the angle between two legs, given that data (assuming 2 dimension).

 

One problem with incremental encoders is they need to be referenced at power on, the absolute are typically 12bit with up to 16bit available.
The CUI John mentions have absolute as well as incremental.
This is a simple BCD etc.