Do you have any data on the deformation of the calibration pattern plate (390 mm) due to temperature?
Do you have any data on temperature and accuracy of the Ensenso X36?
Application: Angle inspection of car tires angle (project with expected high volume)
The customer is planning to evaluate the temperature drift by changing the environmental temperature of the Ensenso X36 from 10°C to 30°C in the following test.
Method: Photograph the calibration pattern plate at a distance of 800 mm and evaluate the accuracy at each temperature.
the large calibration plates will effectively behave similar to aluminum, so they have a coefficient of thermal expansion around 24e-6/K (see here. This translates to roughly 0.18mm over the entire plate for the change from 10 to 30°C, or 0.048%. We also have the newer revision of the calibration plate (see here) with glass substrate, which will be a lot more precise in terms of printing accuracy, and thermal expansion, reducing the effect to roughly 0.018%.
But in our experience the temperature effects on the calibration plate are negligible. The effect of lenses, camera housing, and camera mounting are the dominant components.
For X-Series we have a measurement series for an X36-1FA with 400mm baseline, 800mm focus distance, 12mm lenses. The goal was to quantify the calibration drift after power-on. The temperature rise after power-on was around 15°C over 1 hour. The observed ceramic pattern was fixed via a temperature isolated aluminum structure to the camera. The pattern points drifted approximately 0.3px in each camera over this period, which translated to an approximate Z-drift of 0.4mm in this camera configuration.
It is in general difficult to extrapolate such a measurement to a specific camera configuration. The best way is indeed to test it, as close as possible to the final configuration. Also the mounting of the device will play an important role in such cases. What is also important on the device is to use a configuration with FA cameras, instead of CP1 or CP2, because all CP cameras have an asymmetric mounting from a single side only, and an asymmetric internal mechanical design, which is results in much higher temperature drift effects.
The test procedure you outlined in your post seems reasonable to me. You can just plot the position of the observed pattern over time, maybe also at different image positions, which should give you a good idea of the expected effects.
Let me know if you need any further advice for testing or later in data interpretation.