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Laser retro reflector for non-contact odometers.

Thadwald

Oct 23, 2023
1
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Oct 23, 2023
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I’m looking for a sensor that will register a bright spot such as tape or white paint on a rotating shaft. I need to accommodate a variety of working distances ranging from 2- 20cm. I’m thinking something like the Waveshare laser module, which has a laser light source and a lensed receiver. I haven’t tried it but I believe I would need a way to tune it for each application, for example by varying the laser power, so that it actually switches. I do like the idea of a visible laser as an aiming aid.

Any suggestions?
 

Bluejets

Oct 5, 2014
6,708
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Oct 5, 2014
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6,708
Modulated IR module would do the same job.
Visibility, use your phone camera.
Or phototransistor as used in RC tachos if you have a daylight source.
 

Delta Prime

Jul 29, 2020
1,642
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Jul 29, 2020
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1,642
Welcome to Maker Pro
:) Need to know: mounting system;
ball mount,hard mount etc.
Spectral wavelength in nanometers.
Beam deviation in arc seconds
Exiting Peak to Valley wave front deformation.
These specifications will dictate the type of retro reflector needed
Prismatic or orthogonal.
 

Bluejets

Oct 5, 2014
6,708
Joined
Oct 5, 2014
Messages
6,708
Need to know: mounting system;
ball mount,hard mount etc.
Spectral wavelength in nanometers.
Beam deviation in arc seconds
Exiting Peak to Valley wave front deformation.
These specifications will dictate the type of retro reflector needed
Prismatic or orthogonal.
...........really..?????
I think not.
 

Delta Prime

Jul 29, 2020
1,642
Joined
Jul 29, 2020
Messages
1,642
Beam deviation in arc seconds
Exiting Peak to Valley wave front deformation
Correction: Exiting Wavefront and Beam Deviation are interrelated please specify one or the other.
I need to know the resolution you seek.
 
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