研究目的
To propose a linear encoder utilizing Terahertz (THz) wave and polarization information for industrial applications, demonstrating its resistance to fine particles and gap fluctuation between the read head and scale.
研究成果
The THz polarimetric encoder with THz polarimetric sensing can be utilized for positioning applications, demonstrating potential resistance to fine particles and gap fluctuation.
研究不足
The study is a fundamental experimental evaluation; future work includes performance evaluation under various conditions.
1：Experimental Design and Method Selection:
The experiment utilized a THz-TDS system in reflection mode to transmit and receive two orthogonal polarized THz waves.
2：Sample Selection and Data Sources:
Two polarizers as the scale were arranged adjacently on a positioning stage with their polarization angles at 0 and 90 degrees.
3：List of Experimental Equipment and Materials:
THz-TDS instrument (TAS7500TS, ADVANTEST Corp.), optical components, positioning stage, wire grid polarizers (WGF, Asahi Kasei Corp.).
4：Experimental Procedures and Operational Workflow:
THz wave was focused on the scale using a parabolic reflector, and RSS was measured in every
5：2 mm step movement of the scale. Data Analysis Methods:
Differential RSS between two orthogonal polarizations was calculated to determine position information.
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