### VISAR Analysis in the Frequency Domain

VISAR measurements are typically analyzed in the time domain, where velocity is approximately proportional to fringe shift. Moving to the frequency domain clarifies the limitations of this approximation and suggests several improvements. For example, optical dispersion preserves high-frequency information, so a zero-dispersion (air delay) interferometer does not provide optimal time resolution. Combined VISAR measurements can also improve time resolution. With adequate bandwidth and reasonable noise levels, it is quite possible to achieve better resolution than the VISAR approximation allows.

- Publication Date:

- Report Number(s):
- SAND-2017-6427J

Journal ID: ISSN 2199-7446; PII: 121

- Grant/Contract Number:
- AC04-94AL85000; NA0003525

- Type:
- Accepted Manuscript

- Journal Name:
- Journal of Dynamic Behavior of Materials

- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 3; Journal ID: ISSN 2199-7446

- Publisher:
- Springer

- Research Org:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

- Sponsoring Org:
- USDOE National Nuclear Security Administration (NNSA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 36 MATERIALS SCIENCE; VISAR; Velocimetry; Fourier transform; Frequency domain; Time resolution

- OSTI Identifier:
- 1367088

```
Dolan, D. H., and Specht, P..
```*VISAR Analysis in the Frequency Domain*. United States: N. p.,
Web. doi:10.1007/s40870-017-0121-7.

```
Dolan, D. H., & Specht, P..
```*VISAR Analysis in the Frequency Domain*. United States. doi:10.1007/s40870-017-0121-7.

```
Dolan, D. H., and Specht, P.. 2017.
"VISAR Analysis in the Frequency Domain". United States.
doi:10.1007/s40870-017-0121-7. https://www.osti.gov/servlets/purl/1367088.
```

```
@article{osti_1367088,
```

title = {VISAR Analysis in the Frequency Domain},

author = {Dolan, D. H. and Specht, P.},

abstractNote = {VISAR measurements are typically analyzed in the time domain, where velocity is approximately proportional to fringe shift. Moving to the frequency domain clarifies the limitations of this approximation and suggests several improvements. For example, optical dispersion preserves high-frequency information, so a zero-dispersion (air delay) interferometer does not provide optimal time resolution. Combined VISAR measurements can also improve time resolution. With adequate bandwidth and reasonable noise levels, it is quite possible to achieve better resolution than the VISAR approximation allows.},

doi = {10.1007/s40870-017-0121-7},

journal = {Journal of Dynamic Behavior of Materials},

number = 3,

volume = 3,

place = {United States},

year = {2017},

month = {5}

}