Electronics > Beginners

Are there non-contact vibration sensors for Arduino or PC?

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DTJ:
Do you have a moving metal target on the shaver?

Use an oscillator with a lossy coil to sense the moving metal.

http://www.kamansensors.com/  used to make them 20 years ago,  I guess they still do.


You can make one with a transistor, some caps and a coil & send the output to a CRO.




ddavidebor:
You can also use a doppler radar to measure vibration, there are articles about it, but it's not simple.

Dundarave:
If you can get within a few millimetres of the electric razor's moving blade (assuming that the blade contains steel), then perhaps a simple coil similar in design to an electric guitar pickup might be all you need. 

Essentially a variable-reluctance sensor, you could wind a quick-and-dirty coil around a magnetized iron nail and see what the output looks like when you hold the head of the nail (i.e. the coil perpendicular) near to the moving blade...

engineheat:

--- Quote from: Brumby on September 08, 2019, 10:41:45 am ---
--- Quote from: engineheat on September 06, 2019, 07:45:03 pm ---but it seems the max frequency is only 3000hz. Is this the sampling rate?

--- End quote ---

The answer is in the specification:

AVAILABLE COMMANDS
Here is a list of commands that you can send to the accelerometer dongle. You can control the frequency of data sampling, the range of measured acceleration and stop/start streaming data. This dongle has an LED to indicate if the acceleration is measured and how fast it is measured. It also has an LED power indicator.

STOP - Stops accelerometer data streaming.

START - Starts accelerometer data streaming.

FREQ frequency - Changes acceleration data sampling frequency.

Available frequency values in hertz are: 3200, 1600, 800, 400, 200, 100, 50, 25, 12.5, 6.25, 3.13, 1.56, 0.78, 0.39, 0.2, 0.1.

--- End quote ---

A max data sampling freq of 3200 is not enough to sense vibration 5khz or above right? I assume an object that creates a 5khz sound is also vibrating at 5khz.

engineheat:

--- Quote from: kosine on September 08, 2019, 12:32:01 pm ---Would a linear hall effect sensor work?

SS49E datasheet says response time of 3us, so sampling rate would be adequate.

https://sensing.honeywell.com/honeywell-sensing-ss39et-ss49e-ss59et-product-sheet-005850-3-en.pdf

--- End quote ---

I'm not familiar with hall effect sensors. How would it work for my project?
thanks

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