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China developed low-cost time grid sensor
Recently, it was reported by the Chongqing Municipal Information Industry Bureau that Professor Peng Donglin from Chongqing Institute of Technology has successfully developed a time-grating sensor, supported by the National Natural Science Foundation of China. This groundbreaking innovation challenges the traditional belief that high-precision measurement requires a high-precision physical ruler. By redefining how space and time are measured, this method significantly reduces the complexity of displacement sensors and lowers manufacturing costs to just one-tenth of similar foreign products.
Currently, measuring time is much simpler, cheaper, and more accurate than measuring space. Time-based measurements are less affected by environmental factors like temperature and gravity. However, achieving the same level of precision in space measurement typically comes at a much higher cost. Professor Peng Donglin took advantage of the low-cost and high-accuracy features of time measurement and applied them to spatial measurement, leading to the invention of the time-grating sensor.
According to reports, the design concept behind the time-grating sensor involves establishing a "space-time coordinate conversion system." This system allows clock pulses to correspond uniquely to spatial positions. Combined with a microcontroller, the accumulated count of clock pulses is used to measure displacement, forming a "time-grating precision displacement measurement system."
At an appraisal meeting organized by the National Natural Science Foundation of China, Professor Ye Shenghua, an academician of the Chinese Academy of Engineering and director of the State Key Laboratory of Testing Technology and Precision Instruments at Tianjin University, along with other experts, praised the achievement as innovative. They noted that this technology achieves precise angular displacement measurement without the need for a physical ruler.
Professor Peng explained that top-tier precision mechanical engraving companies have invested hundreds of millions of euros to build multi-layer underground cleanrooms for producing high-precision grating components. In contrast, his time-grating sensor uses the idea 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 highly demanding precision engraving, making large-scale production possible in regular environments.
Experts believe that this technology has the potential to greatly enhance the measurement accuracy and overall manufacturing capabilities of CNC machine tools in China, marking a significant step forward in precision engineering.