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 -

 Sonotron NDTOriginal developer and manufacturer of advanced ultrasonic instruments
 495 views
Technical Discussions
Jaeseo Park
R & D,
DOOSAN, South Korea, Joined Jun 2009, 10

Jaeseo Park

R & D,
DOOSAN,
South Korea,
Joined Jun 2009
10
04:07 Dec-15-2018
Probability of detection

Dear professionals,
What does upper right point (POD=1 & PFA=1) in ROC curve mean?
By definition, POD +PFA must be unity.

http://zfp.cbm.bgu.tum.de/mediawiki/index.php/Probability_of_detection_(POD)

Thank you

From Far-East

Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 805

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
805
00:25 Dec-16-2018
Re: Probability of detection
In Reply to Jaeseo Park at 04:07 Dec-15-2018 (Opening).

Your statement that POD + POFA must be unity is incorrect. They are independent

Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 805

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
805
03:33 Dec-16-2018
Re: Probability of detection
In Reply to Jaeseo Park at 04:07 Dec-15-2018 (Opening).

Example
There are 20 samples with flaws in 10.
An inspection calls flaws in all 20.
Then POD is 10/10= 1.0
POFA = 10/10 = 1.0

Reliability = POD (1-POFA) = 0

Jaeseok Park
R & D,
DOOSAN, South Korea, Joined Jun 2009, 10

Jaeseok Park

R & D,
DOOSAN,
South Korea,
Joined Jun 2009
10
12:57 Dec-16-2018
Re: Probability of detection
In Reply to Jaeseo Park at 04:07 Dec-15-2018 (Opening).

To Anmol Birring,
Yes your right. I totally mis-understood the document.
Thank you.

Petronext International
Petronext International
08:06 Dec-18-2018
Re: Probability of detection
In Reply to Jaeseo Park at 04:07 Dec-15-2018 (Opening).

A quantitative result can be calculated by the probability of detection (POD) and the possibility of false alarms (PFA).

Product Spotlight

GUL Subsea Solutions - Screeening & Monitoring

To inspect new and existing subsea lines, you need proven technology and experience. GUL offers it's
...
technology to solve this challenge: GUL Subsea and gMAT Transducer Rings.
>

NEW Wheel Type Phased Array Probe

DOPPLER NEW Wheel Type Phased Array Probe, more stable, new tyre makes lesser acoustic attenuation
...
, much lighter makes easier to handle, more slim size, magnetic and mechanical encoder optional etc...more
>

MUSE Mobile Ultrasonic Equipment

The MUSE, a portable ultrasonic imaging system, was developed for in-field inspections of light-weig
...
ht structures. The MUSE consists of a motor-driven manipulator, a water circulation system for the acoustic coupling and a portable ultrasonic flaw detector (USPC 3010). The MUSE provides images of internal defects (A-, B-,C- and D-scan).
>

Echomac® PA Bar Tester

The Echomac® PA BT provides 100% inspection of round bars for core and surface defects, at speeds u
...
p to 2 m/sec, depending on the specific application. The unit allows producers to handle a much larger range of diameters in one installation, and is available in 3 models to test 10 – 75mm diameter (small model); 20 – 130mm (medium model) or 50 – 254mm (large model) bars.
>

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