PROJECT TITLE :
Digital High-Resolution Torque Sensor and Signal Processing
A contactless skinny-layered torque sensor with absolutely digital signal processing circuit is proposed in this paper. The mechanical structure of the torque sensor is an orange-slice-alike versatile body. 2 links with black/white stripes are aligned beforehand as no any torque applied to the shaft. The two links play the role of optical grating by resolution. As long because the orange-slice-alike flexible body, sandwiched by the aforesaid links, is subject to an external torque applied, a twisted angle is induced between the 2 skinny photograting discs. 2 sets of photodetector cooperate with the 2 discs with optical gratings to come up with two pulse sequences. Thus, a time delay between these 2 pulse sequences can be acquired as long because the shaft is twisted by a torque. A counter IC is utilized to quantify this point delay in terms of the torque applied, and the time period in terms of rotational speed of shaft. One in all the merits of the proposed torque sensor is that real-time measurement on torque applied becomes feasible even if the shaft, subject to external torque, is rotating at high speed. Alternative benefits of the absolutely digital signal processing circuit embrace: 1) no would like to conduct analog/digital conversion and 2) freed from noise, crosstalk and electromagnetic interference.
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