D415 Temperature
The Intel RealSense Viewer surfaces ASIC and Projector Temperature:
According to https://intelrealsense.github.io/librealsense/doxygen/rs__option_8h.html, however, there are five more temperature metrics:
- RS2_OPTION_MOTION_MODULE_TEMPERATURE: Current Motion-Module Temperature
- RS2_OPTION_LLD_TEMPERATURE: LLD temperature
- RS2_OPTION_MC_TEMPERATURE: MC temperature
- RS2_OPTION_MA_TEMPERATURE: MA temperature
- RS2_OPTION_APD_TEMPERATURE: APD temperature
I have not been able to find the above abbreviations in https://www.intelrealsense.com/wp-content/uploads/2019/10/Intel-RealSense-D400-Series-Datasheet-Oct-2019.pdf, which in my opinion is the most in-depth piece of documentation on the D415.
Does anyone know what these metrics actually measure?
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I have never heard of these temperature settings before, so my research is based on speculation of the most likely definitions for those terms.
I could not find an explanation for what MA temperature might be.
I would speculate that LLD is Lamp Lumen Depreciation.
https://www.hepetech.com/new/what-is-led-lamp-lumen-depreciation.html
MC is probably the temperature of the "Moisture Content" of the camera (see the Humidity values on page 33 of the current edition of the data sheet document).
APD is likely to be "Avalanche Photodiode".
https://en.wikipedia.org/wiki/Avalanche_photodiode
In practice though, you should never need any of these temperature settings. The ones in the Viewer (ASIC circuit board temperature and the Projector temperature) are most important to the stable operation of the camera.
The recommended maximum operating temperature of the 400 Series cameras is 35 degrees C (though you should be able to go to 42 before problems start manifesting).
The camera has a built in temperature safety mechanism.
https://github.com/IntelRealSense/librealsense/issues/5209#issuecomment-551610926
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