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10-27-2016, 03:43 AM #28
- Join Date
- Oct 2016
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I agree. Its not that it can't be done, but at what cost. Its interesting that they claim they can compensate for environmental factors with doppler, phase difference, etc. It is a very challenging environment especially on a 3D printer with a heated bed. The hot end near the sensor may be at 240C and the bed is at 110C and the air surrounding the bed is at 25C with a fan blowing over it. I would be shocked if the air density remains constant between the probe and the bed unless its a very short distance. At least with a physical mechanical probe, you have a set known distance that shouldn't change. Here, you are dependent on the sound waves travelling through air onto a hot surface and bouncing back. It might work in a relatively short distance from the sensor, I just don't know. They have to prove that it works and its reliable.
The 10F to 160F (-12C to 71C) is actually a very reasonable temperature swing that would accelerate the life cycle testing of the electronics. Most high reliability electronics can handle those temperature swings within a limited amount of cycles (ie: 30 cycles). You have to temp cycle it through the range and measure with a fixed calibrated height. Its the only way you know what the measurements are doing in those environments. At least you can do a plot and get an idea of the delta in readings and plot the change over time/temperature. You may find out that its only accurate at a specific temperature range. The accuracy and precision may even drift with the temperature swings. If they claim something is accurate or precise to a certain level, the entire device, including sensor and the electronic components has to output a signal within those spec limits. If the electronic components drift over temperature, even though the sensor is stable, the output would also drift. You may end up having to source high precision components with low thermal drift to maintain the requirements.
I hope others are asking similar questions and getting honest answers. I don't mind if someone doesn't know an answer, but if they give me a BS answer, I will be all over them in a short time. They have three PhD graduates or candidates working on the project, so they should be able to answer some of these technical questions easily.
Last edited by ShadowX; 10-27-2016 at 04:02 AM.
Holes and pockmarks in print walls
06-04-2024, 09:14 AM in General 3D Printing Discussion