where expertise comes together - since 1996 -

# The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

 473 views
Technical Discussions
John P Smith
John P Smith
02:46 Sep-26-2003
Focused ultrasonic transducers

Does anyone know of a mathematical solution to the beam intensity at the focal point of an ultrasonic transducer for pulsed operation. The equation in Ultrasonic testing of materials by Krautkramer does not seem to work.

Regards
John Smith

Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1252

Ed Ginzel

R & D, -
Materials Research Institute,
Joined Nov 1998
1252
05:21 Sep-27-2003
Re: Focused ultrasonic transducers
John:
I am not sure if the equation is the same but in the Panametrics catalogue (found on their website that is linked to from ndt.net) there is a section on increased sensitivity by focusing. They indicate the gain as a function of focal length over near field length then plot the relative increase in signal amplitude for a point target (on axis). They also note on the plot that the amplitude from a small defect cannot exceed the amplitude from a flat plate. This suggests that the amplitude gain recorded will be a function of the target size.
If it is a quantitative measure you are trying to calculate (e.g. units of pressure or energy) I differ to others for the equations.
Ed

----------- Start Original Message -----------
: Does anyone know of a mathematical solution to the beam intensity at the focal point of an ultrasonic transducer for pulsed operation. The equation in Ultrasonic testing of materials by Krautkramer does not seem to work.
: Regards
: John Smith
------------ End Original Message ------------

Product Spotlight

#### ISAFE3 Intrinsically Safe Sensor System

ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica
...
l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A.
>

#### IRIS 9000Plus - Introducing the next generation of heat exchanger inspection.

Representing the seventh generation of the IRIS system, the IRIS 9000 Plus has nearly 200 years of c
...
ombined field inspection experience incorporated in its design. This experience combined with a strong commitment to quality and a history of innovation has made Iris Inspection Services® the undisputed leader in IRIS technology.
>

#### FD800 Bench Top Flaw Detectors

The bench-top FD800 flaw detector range combines state-of-the-art flaw detection with advanced mater
...
ial thickness capabilities. Designed for use in the laboratory these gauges are the tool you need for all your flaw detecting needs.
>

#### Magnetic X-Ray Pipeline Crawler

Zhong Yi brand pipeline crawler is magnetic/micro-video controlled crawler with DC X ray unit inst
...
alled for checking welding of pipeline. Move steadily inside the pipeline 6''-60''diameter with speed of up to 18m/min, Max. moving diatance 5 kilometers and provide the efficient inspection of the pipeline.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window