DETAILS OF THE ACHIEVEMENT
|
|
Research of nonlinear effects in the time measurements device based on surface acoustic wave filter excitation
|
|
|
Petr Pánek, Ph.D. |
|
| Year: 2009 |
|
All the high resolution timing devices are based on time interpolation.
It results from our previous work that a surface acoustic filter can be
used as an extremely precise time interpolator. We analyzed the
nonlinear effects in this time interpolator. The analysis shows that the
nonlinear distortion in the interpolator circuits causes a deterministic
measurement error . The dependence of this error on time of the measured
events can be expressed as a sparse Fourier series thus it usually
oscillates very quickly in comparison to the clock period. The
theoretical model is in good agreement with experiments carried out on
our experimental two-channel timing system. Using highly linear
amplifiers in the time interpolator and adjusting the filter excitation
level to the optimum, we have achieved the interpolation nonlinearity
below 0.2 ps. The overall single-shot precision of the experimental
timing device is 0.9 ps rms in each channel, which is up to our
knowlegde the best ever achieved in the world.
A prototype of the time interval measurement device.
|
Nobel prize in physics awardee Theodor W. Hänsch discusses the function of our time interval measurement device.
|
|
- Procházka, I. – Pánek, P.: Nonlinear effects in the time measurements device based on surface acoustic wave filter excitation. Rev. Sci. Instruments, sv. 80, č. 7 (2009), s. 0761021-0761023.
|
