Abstract
WHEN a pair of identical converging optical lenses are assembled coaxially with their foci coincident, a three-dimensional object field produces a three-dimensional real image field of the same shape. The field boundaries in the longitudinal direction are determined by the focal length but in the transverse directions the limits are set only by aberrations and vignetting.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Burton, C. J., and Barnes, R. B., J. Appl. Phys., 20, 462 (1949).
Hui Pih and Snyders, L. S., Experimental Mechanics, 9 (4), 186 (1969).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
HANSTEAD, P. Three-Dimensional Imaging of Ultrasound: Direct Ultrasonic Visualization of Defects. Nature 239, 273–274 (1972). https://doi.org/10.1038/239273a0
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1038/239273a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.
