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High-precision distance/time measurement
Since entering the 21st century, the rapid development of precision industrial manufacturing and space technology has imposed stringent requirements on the accuracy and scale of absolute distance measurement. Many large-scale precision measurement tasks, such as measuring the inner and outer diameters of large workpieces, positioning large communication antennas, and satellite formation flying, require absolute distance measurements with sub-micron or even nanometer accuracy over ranges from a few meters to several thousand meters. This level of precision is difficult to achieve with traditional laser measurement methods. Optical frequency combs can provide extremely precise time and frequency references, enabling time interval measurement accuracy at the femtosecond (fs) level. Using optical frequency combs for linear optical sampling (LOS) allows for time scale stretching measurements, thereby improving measurement accuracy and resolution.
In recent years, femtosecond optical frequency combs, especially asynchronous sampling dual-comb systems, have been introduced into the field of distance measurement as a new type of broadband coherent light source. They can achieve measurement accuracy of less than 10 μm over long distances, promising significant breakthroughs in distance measurement. For example, in the inspection and assembly of large structural components such as aircraft and ships, optical frequency comb ranging technology can provide high-precision spatial positioning capabilities. In fields such as high-end equipment manufacturing, industrial robot end-positioning, and dimensional inspection of high-end industrial products like chips, optical frequency comb ranging technology can deliver the required range, accuracy, and speed.
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