We have combined a commercially available, variable length coaxial delay line (trombone line) with a high resolution linear translation system. The result is better resolution and lower uncertainty in the achievable delays than previously available. The range of delay is 0 ps to approximately 1250 ps, the bidirectional resolution is 2.0 ps, the unidirectional resolution is 0.2 ps, and the uncertainty in the measured delay is +/-0.09 ps. Drift, temperature dependence of delay, repeatability, linearity, and hysteresis were also examined.
and Paulter, N.
Nanosecond Delay With Subpicosecond Uncertainty, Review of Scientific Instruments, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32629
(Accessed December 1, 2023)