Printing surface roughness testerIt is a professional equipment used for precise measurement of micro roughness on printing surfaces. Its core principle is to capture surface peaks and valleys through probes or optical sensors, separate micro roughness components through filtering technology, and calculate parameters (such as Ra, Rz) according to international standards to quantitatively evaluate the impact of surface processing quality on printing suitability. Here is a detailed introduction:

　Printing surface roughness testerCore principles and measurement methods:

Contact measurement:

Probe scanning method: Using a diamond probe (with a tip radius usually less than 2 μ m) to scan across the surface at a constant speed, the vertical displacement of the probe is converted into an electrical signal through a displacement sensor (such as a differential transformer or piezoelectric sensor).

Signal processing: After amplification, electrical signals are filtered out of macroscopic shape errors (such as flatness) and waviness through electronic filters, retaining only the components representing microscopic roughness.

Parameter calculation: After the filtered signal is digitized, roughness parameters such as Ra (arithmetic mean deviation), Rz (maximum height), etc. are calculated according to international standards (such as ISO 4287).

Non contact measurement:

Optical interference method: using the light and dark fringes formed by light wave interference to detect surface height changes, with high accuracy, suitable for measuring ultra smooth surfaces.

Confocal microscopy method: Scanning the measurement area using the principle of optical confocal microscopy to reconstruct three-dimensional height information, suitable for measuring complex shapes and small areas.