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China developed low-cost time grid sensor
Recently, it was revealed by the Chongqing Municipal Information Industry Bureau that Professor Peng Donglin from Chongqing Institute of Technology has successfully developed a time-gear sensor, supported by the National Natural Science Foundation of China. This groundbreaking innovation challenges the traditional belief that high-precision measurement requires a highly precise physical ruler. By introducing a method to measure space using time, the technology significantly reduces the complexity of displacement sensors and lowers manufacturing costs to just one-tenth of those of similar foreign products.
Currently, measuring time is much simpler and more cost-effective than measuring space. Time-based measurements are not only cheaper and more accurate but also less affected by external factors like temperature and gravity. However, achieving the same level of precision in space measurement as in time measurement usually comes with higher costs. Recognizing this gap, Professor Peng Donglin applied the low-cost and high-efficiency characteristics of time measurement to spatial measurement, leading to the invention of the time-gear sensor.
According to reports, the core idea behind the time-gear sensor is to establish a "space-time coordinate conversion system." This allows for the mapping of clock pulses into equivalent spatial positions. Combined with a single-chip microcomputer, the system counts clock pulses to measure displacement, forming a "time-gate precision displacement measurement system."
At an appraisal meeting organized by the National Natural Science Foundation of China, experts including Academician Ye Shenghua from the Chinese Academy of Engineering and director of the State Key Laboratory of Testing Technology and Precision Instruments at Tianjin University, praised the achievement as innovative. They noted that the technology enables precise angular displacement measurement without the need for a physical ruler.
Professor Peng explained that world-class precision machining companies spend hundreds of millions of euros to build multi-layer underground cleanrooms to produce high-precision grating components for sensors. In contrast, the time-grating sensor developed by Peng uses the concept of a "relative motion bi-coordinate system," where differences in position on one axis are expressed as time differences on the other. This approach eliminates the need for extremely precise mechanical engraving, making large-scale production possible in standard environments.
Experts believe that this technology could significantly enhance China's CNC machine tool accuracy and overall equipment manufacturing capabilities, marking a major step forward in the field of precision measurement.