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 -

634 views
Technical Discussions
Silvia Estrada
Silvia Estrada
04:53 Jul-17-2002
Thermal conductivity meausurements using ultrasonics

Hello,
I wonder if there is any information regarding measurement of thermal properties of materials using ultrasonics. Is there any equipment commercially available?
Thank you


    
 
 
Godfrey Hands
Engineering,
PRI Nadcap, United Kingdom, Joined Nov 1998, 289

Godfrey Hands

Engineering,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
289
08:29 Jul-17-2002
Re: Thermal conductivity meausurements using ultrasonics
: Hello,
: I wonder if there is any information regarding measurement of thermal properties of materials using ultrasonics. Is there any equipment commercially available?
: Thank you
.

Dear Silvia,
Quasar International in the USA markets an instrument that determines the mechanical properties of materials (Elastic Constants etc) using Resonant Ultrasound Spectroscopy.
This has been used to measure the phase change of materials with temperature, as it can work between temperatures of Liquid Helium and up to 1500 Celius I believe.
Look at their web site. www.quasarintl.com and then look at the section about Ruspec.

We market this equipment in Northern Europe.

Regards,

Godfrey Hands


    
 
 
Kris Van de Rostyne
Kris Van de Rostyne
02:27 Jul-17-2002
Re: Thermal conductivity meausurements using ultrasonics
Hello,

The thermal properties can be determined using laser-ultrasonic techniques. The absorption of the laser energy by the material causes thermal expansion, which in turn (thermoelastic effect) launches ultrasonic waves.
From the thermal expansion, information about thermal properties (e.g. diffusivity, ...) can be extracted (together with the elastic properties, which can be determined from the ultrasonic wave propagation characteristics).

Concerning the determination of thermal properties in a laser-ultrasonic measurement, you could have a look at the following articles:
*Graebner et al. Measurement of thermal diffusivity by optical excitation and infrared detection of a transient thermal grating, Rev. Sci. Instrum 66, 3903 (1995)
*Jauregui et al. Thermal diffusivities measured by photodisplacement detection of transient thermal grating, Appl. Phys. A 54, 35 (1992)
*Käding et al. Transient thermal gratings at surfaces for thermal characterisation of bulk materials and thin films, Appl. Phys. A 61, 253 (1995)

Hope this helps,

Kris Van de Rostyne

: Hello,
: I wonder if there is any information regarding measurement of thermal properties of materials using ultrasonics. Is there any equipment commercially available?
: Thank you
.



    
 
 

Product Spotlight

Teletest Focus+

Teletest Focus+ electronics have superior capabilities than rivals on the market. Beyond the usual
...
test features, Focus+ has 24 transmit channels and 24 receive channels, with an additional on-board switching capabilities. The instrument's frequency range is 10–300 kHz.
>

NovaScope 6000

The all-digital Novascope 6000 is a portable, ultra-high precision thickness gauge for high-speed
...
thickness measurement. Novascope 6000 has unmatched capabilities and unique features including: •Superior Resolution with high contrast, high-speed color RF display •High pulser voltage •Real-time video output •Increased internal/external data storage •Programmable SetUp features •Battery & AC Powered
>

NOVO Armor 15 & NOVO Armor 22

The Armor Kit Contains the NOVO Armor, which provides additional mechanical protection to the NOVO 1
...
5WN & NOVO 22WN Detectors, the Armor Stand and a traveling soft cover. - Newest shock absorbent technology case - Water resistant design - Supports wired & wireless communication - Multiple positioning options - Tripod connection using the Built-in 1/4” threads - Simple Detector battery replacement
>

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