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Technical Discussions
Sakthikumar
NDT Inspector,
Toshiba jsw power system pvt. ltd., India, Joined May 2016, 1

Sakthikumar

NDT Inspector,
Toshiba jsw power system pvt. ltd.,
India,
Joined May 2016
1
05:13 Dec-13-2016
Clarification

I got two angle probes two probes same angle and same frequency same manufacturing (70' 4mhz). One probe high energy (dB) one probe low energy two probe energy different in 9dB.
Please tell as, what is the reason for high energy.
Regards,
Sakthikumar.

    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
10:55 Dec-13-2016
Re: Clarification
In Reply to Sakthikumar at 05:13 Dec-13-2016 (Opening).

Age? Hours of operation. Even inanimate objects can (do) lose power with time.

    
 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
11:12 Dec-13-2016
Re: Clarification
In Reply to Sakthikumar at 05:13 Dec-13-2016 (Opening).


You take a third probe from the same manufacturer ( same angel and frequency) I am sure it will have different energy from the two you are having.

The energy depends on many factors including the central frequency of the crystal used, how tightly or loosely the crystal is pressed on to the wedge, electrode contacts, from the particular slab from which the probe crystal is cut and shaped etc.

Reputed manufacturers try to make them as uniform as possible. ( By the way the probes are from India or abroad- Please do not mention the name of the manufacturer.)

Best wishes

P V SASTRY

    
 
 Reply 
 
Mark
,
Zambia, Joined Jun 2016, 49

Mark

,
Zambia,
Joined Jun 2016
49
15:14 Dec-13-2016
Re: Clarification
In Reply to Sakthikumar at 05:13 Dec-13-2016 (Opening).

Kumar,
9dB is significant deviation.
Make sure that one of the probes is not damaged.
If the probes are not new brand I think you should first check the connection of probes,some times inside the connection of probe is oxidaized and need smooth cleaning.
Angle of probes may be is not the same exactly(+-2 degree as the code requirement) and will detect the same reflecter in different sounth path (if the reflecter is SDH). So larger angle have larger sound path, lower near field and more attention compare to lower angle probes.
Wear resistant shoes that attached to each probes if are not made from same material or attached with different way, also have affect on amplitude of receiving signals.

Regards.
Mark

    
 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1266

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1266
16:52 Dec-13-2016
Re: Clarification
In Reply to Sakthikumar at 05:13 Dec-13-2016 (Opening).

Even from the same manufacturer with new probes, you can purchase a variety of bandwidths for the same "style" of probe. Generally the lower bandwidth probes have a larger amplitude signal for a given applied voltage and receiver amplification (at the expense of resolution).

    
 
 Reply 
 

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