In field operation the imager was placed at a portable and multifunction field observation bracket to capture canopy image after being adjusted to the optimal height and viewing angle through the built-in gradienter
to ensure consistent field image collection.
To minimize the influence of parallelism error of wheel end face and sample surface, the experimental system is adjusted using a gradienter
during assembling and clamping process, and repeated fine grinding is conducted on sample surface before every recorded test.
(3) Install the gradienter
and the adjustable bolts to reduce the human factors to improve the accuracy of the test results.