About State Key Laboratory of Precision Measurement Technology and Instruments

State Key Laboratory of Precision Measurement Technology and Instruments

The State Key Laboratory of Precision Measurement Technology and Instruments (Chinese: 精密测试技术及仪器国家重点实验室) is a national State Key Laboratory hosted principally by Tianjin University in Tianjin and built jointly with Tsinghua University in Beijing. It is China's national platform for precision measurement science, covering laser and optical measurement, precision sensors, micro- and nano-measurement, measurement instruments and the metrology on which advanced manufacturing depends. As part of the Ministry of Science and Technology state key laboratory system, which counted 533 approved laboratories as of 2023, it is profiled under Tianjin as its principal host city, with its joint Tsinghua component recognised as an integral part of its structure. It complements the National Institute of Metrology's national standards work with university-based research into measurement technology itself.

Foundations at Tianjin University

The laboratory's principal lineage runs through Tianjin University, China's first modern university, founded in 1895 as Peiyang University. The university's School of Precision Instruments and Opto-Electronics Engineering records that a precision mechanical instrument specialty was set up in 1952 and that a precision instrument engineering department followed in 1959. Through the following decades the discipline accumulated national standing: in 1988 the testing and measuring techniques and instruments specialty and optical instruments were approved among China's national key disciplines. On 2 October 1995 the university established the School of Precision Instruments and Opto-Electronics Engineering, and its official history records the establishment of the national key laboratory of precision testing techniques and instruments in the same year, 1995. In 2007 precision instrument and mechanical engineering was again approved as a national key discipline, confirming the field's central place in the university.

The Tsinghua partnership

Uniquely among the laboratories in this series, this laboratory is a joint construction of two universities. At Tsinghua University in Beijing, the Department of Precision Instrument, derived from the Department of Mechanical Engineering founded in 1932 and described by Tsinghua as one of the oldest engineering departments in China, hosts the laboratory's Beijing component. The department covers two key disciplines, optical engineering and instrument science and technology, and lists the State Key Laboratory of Precision Measurement Technology and Instruments among its principal scientific research platforms. Its Institute of Instrument Science and Technology, covering MEMS, precision measurement and testing, sensors and transducers and related fields, forms a major part of the state key laboratory and provides advanced equipment including the facilities of the Tsinghua Micro/Nano Technology Research Center. The joint structure links Tianjin's precision instrument school with Tsinghua's precision instrument department, pooling two of China's strongest groups in the discipline.

What precision measurement means

Precision measurement is the science of knowing sizes, positions, shapes and physical quantities accurately enough for modern engineering to work. Aircraft components, semiconductor wafers, precision machine tools and scientific instruments all depend on measurement that is finer than the tolerances being manufactured. The laboratory's role in the national system is to advance that underlying capability: the instruments, sensors and methods that other industries use to verify what they have made. Tianjin University's precision instruments school frames the same mission through its disciplines of instrument science and technology, optical engineering and biomedical engineering, which have been rated consecutively among the top national key disciplines by the Ministry of Education. Research at that level is both fundamental — concerned with the physics of light, sensing and signal processing — and intensely practical, because a better measurement method can be adopted across whole industries.

Laser and optical measurement

Light is the laboratory's principal measuring tool. Its programme includes laser and optical measurement, the family of techniques that uses laser interferometry and optical methods to measure length, displacement, angle and surface form without touching the object being measured. Large-scale dimensional measurement — determining the geometry of very large structures such as aircraft assemblies, spacecraft and heavy equipment — is a recognised strength associated with the Tianjin group, where the challenge is to keep laboratory-grade accuracy over distances of metres rather than millimetres. Optical engineering research within the laboratory also connects to the opto-electronics work of the Tianjin school, which hosts Ministry of Education key laboratories for opto-electronics information technology and micro-optical-electro-mechanical systems.

Sensors, micro- and nano-measurement

Alongside optical methods, the laboratory researches precision sensors and micro- and nano-measurement: the sensing devices that convert physical quantities into signals, and the techniques for measuring structures at the scale of microfabricated devices and nanometre features. Tsinghua's institute describes its corresponding work as spanning micro/nano technology, MEMS-based space technology, precision measurement and micro/nano metrology, sensors and intelligent instruments, and life science instruments. Tianjin's school built supporting infrastructure for this scale of work, including a micro/nano-meter manufacturing technology engineering centre and a Ministry of Education base for micro/nano-meter science and technology, both established in the mid-2000s. Measurement at these scales underpins semiconductor production, where feature sizes are counted in nanometres and process control is impossible without commensurate metrology.

Service to advanced manufacturing and aerospace

The laboratory's published brief states that its work on large-scale dimensional measurement, optical engineering and intelligent sensing serves aerospace, equipment manufacturing and semiconductor production. Those three sectors share a dependence on measurement: aerospace structures must be assembled to exact geometry, high-end equipment manufacturing competes on precision, and semiconductor fabrication is fundamentally a measurement-controlled process. By developing instruments and methods rather than end products, the laboratory supports all three at once. Its intelligent sensing research, which combines sensors with signal processing and data interpretation, reflects the direction of modern manufacturing, in which measurement is embedded in production lines and equipment rather than performed afterwards in a separate inspection step.

Instruments as a discipline

The laboratory also sustains instrument science as an academic discipline in its own right. Both host universities teach the field at undergraduate and graduate level: Tsinghua's department offers doctoral programmes in instrument science and technology and optical engineering, and Tianjin's school runs the corresponding specialties that were first authorised for master's degrees in 1978 and doctoral degrees thereafter. The laboratory's researchers thus work in an environment where the design of instruments is itself the subject of study — how to make a sensor more stable, an interferometer more accurate, a measuring system more robust outside the laboratory — rather than a mere service to other sciences. That disciplinary depth is why China maintains a dedicated state key laboratory for measurement technology rather than leaving metrology entirely to its national standards institute.

Relationship to national metrology

The laboratory's work is distinct from, and complementary to, that of the National Institute of Metrology, which maintains China's primary measurement standards and the traceability chain for legal metrology. The university laboratory's contribution is upstream research: new measurement principles, new instrument designs and new methods that can later be standardised, commercialised or adopted by industry. The two kinds of institution meet in the concept of traceability — measurements in a factory must ultimately connect to national standards — and the laboratory's research on measurement instruments and methods strengthens the technology base on which that chain rests. Its joint Tianjin-Beijing structure, its 1995 establishment within one of China's oldest precision instrument schools, and its coverage of optical measurement, sensors and nano-metrology make it the national system's dedicated university platform for precision measurement science.

Profile summary

The State Key Laboratory of Precision Measurement Technology and Instruments is hosted principally by Tianjin University in Tianjin, where the national laboratory was established in 1995 within a precision instrument discipline dating to 1952, and is built jointly with Tsinghua University in Beijing, whose Department of Precision Instrument traces its origins to 1932. It conducts national-level research on laser and optical measurement, precision sensors, micro- and nano-measurement and measurement instruments, serving aerospace, equipment manufacturing and semiconductor production, and is profiled in this directory as China's dedicated state key laboratory for precision measurement technology.