Mechanical contact stylus techniques are the traditional method of measuring the internal diameter (ID) of shafts. Bore gauge is a good example for this method. Now I am trying to use non-contact method and after researching about different non-contact techniques and the available equipment, I found confocal chromatic sensor very accurate (as low as 0.5-2 microns). I learned how to use it to find some GD&T features like run-out but I don't know how to find the bore size (internal diameter). The case study is explained below. Any suggestion is highly appreciated.
Geometry: A cylindrical shaft with internal diameter of 0.926" and length of 40"
Question: To find the size of ID by using confocal chromatic sensor.
Thank you
Sorry I have no expertise in optics. My work is in practical learning and teaching: see ‘Inside Teaching: How to Make a Difference for Every Learner and Teacher’ (Routledge, 2017).
Several vendors offer 90 deg options, such as the IFS 2402 from Micro-Epsilon.
Can be found here: https://www.micro-epsilon.com/displacement-position-sensors/confocal-sensor/confocal-chromatic-sensors/
The smaller the device, the smaller the measurement range. Because of how you would need to hold the part, I find it difficult to believe you could send it down the full 40 inches.
If the part is transparent, then you could almost measure the OD and ID directly. I say almost because the curvature of the OD will impact the reflected signal. So in addition to needing to know the refractive index of the tube, you would also need to do additional analysis that these units are not able to perform.
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