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 -
583 views
Technical Discussions
Gowri santhosh Palika
NDT Inspector,
Royscan engineering pte ltd, Singapore, Joined May 2008, 52

Gowri santhosh Palika

NDT Inspector,
Royscan engineering pte ltd,
Singapore,
Joined May 2008
52
01:02 May-18-2008
Radiography contrast

Hi,
how can i define subject contrast and film contrast.
And what is Film gradient?


    
 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 847

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
847
03:13 May-19-2008
Re: Radiography contrast
Film gradient (G):
The slope of the characteristic curve of a film at a specified optical density D.

Object contrast (Subject Contrast):
The relative difference of radiation transmitted between two regions of an irradiated object.

Visual contrast (Film Contrast):
A density difference perceived visually between two adjacent areas when viewing a radiograph.

These definitions were found in the A-Z Section of this site http://www.ndt.net/ndtaz/ndtaz.php


----------- Start Original Message -----------
: Hi,
: how can i define subject contrast and film contrast.
: And what is Film gradient?
------------ End Original Message ------------




    
 
 Reply 
 

Product Spotlight

TESTD-PT SYSTEM

Pulse thermography is a non-contact test method that is ideal for the characterization of thin fil
...
ms and coatings or the detection of defects. With a remarquable short test time and a high detection sensitivity, the Telops TESTD-PT is the perfect tool for non- destructive testing. With such high frame rates, it is even possible to investigate highly conductive or diffusive materials.
>

Combination of Digital Image Correlation and Thermographic Measurements

The combination of measuring results from the digital image correlation (ARAMIS, DIC) and temperat
...
ure measuring data from infrared cameras permits the simultaneous analysis of the thermal and mechanical behavior of test specimens in the materials and components testing field.
>

Wireless TOFD scanner

Quick, accurate and highly reproducible welds testing. The System operates wirelessly and is compat
...
ible with any type of Windows based Laptop, Desktop or Tablet.
>

XRHRobotStar

In high volume industries like automotive the requirement for a hundred percent X-ray inspection c
...
reates a bottleneck in the production. The XRHRobotStar is a fully Automated Defect Recognition (ADR) capable robot-system that allows an ultra-fast in-line inspection.
>

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