Location

La Jolla, CA

Start Date

1979 12:00 AM

Description

Techniques are described in which the intensity distribution of an ultrasound beam is measured with high resolution by means of the radiation reflected from a target whose effective backscattering diameter is smaller than one wavelength. Correlation receivers are used to improve the signal-to-noise ratio of the echo. As the target is scanned across the beam, the phase of the reference signal applied to the correlation receiver must be adjusted to compensate for changes in the time of flight of the ultrasound echo. The broadband beam intensity mapping technique employs a noise signal in which phase compensation is adjusted manually. The other technique, which is used with narrow band signals, applies a phase quadrature technique to achieve phase compensation.

Book Title

Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE

Chapter

11. Fundamentals and New Techniques

Pages

386-387

Language

en

File Format

application/pdf

Share

COinS
 
Jan 1st, 12:00 AM

Beam Intensity Profiling Using Correlation Systems

La Jolla, CA

Techniques are described in which the intensity distribution of an ultrasound beam is measured with high resolution by means of the radiation reflected from a target whose effective backscattering diameter is smaller than one wavelength. Correlation receivers are used to improve the signal-to-noise ratio of the echo. As the target is scanned across the beam, the phase of the reference signal applied to the correlation receiver must be adjusted to compensate for changes in the time of flight of the ultrasound echo. The broadband beam intensity mapping technique employs a noise signal in which phase compensation is adjusted manually. The other technique, which is used with narrow band signals, applies a phase quadrature technique to achieve phase compensation.