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Teletest
Teletest Focus+ was the first system to use long-range guided wave ultrasonic testing to detect corrosion in pipelines.

395 views
03:58 Apr-08-2006
Louis
Depth reading

Hi everyone,

Here is my probleme,

I have a plate of 1.5 in. At 0,750in I have a hole of 0,062in.
With my USN58L I can know the distance from my transducer, the sound path and the depth of this 0.062in hole.

But, when I move my transducer to Leg 2 with this same hole I still get the good distance from my transducer and also the good sound path, but the depth reading is 3.18in instead of 0,750in. I use a 45 deg. angle transducer and the thickness of the plate on my machine is set at 1.750in.

Is it possible that my machine can't give me the depth after Leg 1 and that I always have to use formulas.

Thanks a lot,

LouisB



 
06:25 Apr-09-2006
Ed
Re: Depth reading ----------- Start Original Message -----------
: Hi everyone,
: Here is my probleme,
: I have a plate of 1.5 in. At 0,750in I have a hole of 0,062in.
: With my USN58L I can know the distance from my transducer, the sound path and the depth of this 0.062in hole.
: But, when I move my transducer to Leg 2 with this same hole I still get the good distance from my transducer and also the good sound path, but the depth reading is 3.18in instead of 0,750in. I use a 45 deg. angle transducer and the thickness of the plate on my machine is set at 1.750in.
: Is it possible that my machine can't give me the depth after Leg 1 and that I always have to use formulas.
: Thanks a lot,
: LouisB
------------ End Original Message ------------

I don't believe the machine is incapable of calculating it. Try setting the thickness of the block at 1.5" as you stated it was and not 1.75". You may also want to check the actual angle in the material. Last but not least make sure you have the correct velocity entered in the machine. Then lastest but not leastest, make sure you are looking at the correct reflector and not an inclusion in the block. Did you try to plot the hole on the second leg?



 
08:20 Apr-09-2006

Nigel

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1094
Re: Depth reading Louis

3.18" is the beam path skip distance to the hole (1.5 + 0.75)/cos 45 and you say that you get this distance as the "good sound path" which should be just that - 3.18". The fact that your machine is giving this figure as the depth of the hole cannot be mere coincidence, thus somehow the machine must have been set to give the beam path distance as the depth (maybe through a gate).

For a new and expensive piece of kit the sales rep or tech services of the supplier should assist in untangling your problem.

Good luck

Nigel

----------- Start Original Message -----------
: Hi everyone,
: Here is my probleme,
: I have a plate of 1.5 in. At 0,750in I have a hole of 0,062in.
: With my USN58L I can know the distance from my transducer, the sound path and the depth of this 0.062in hole.
: But, when I move my transducer to Leg 2 with this same hole I still get the good distance from my transducer and also the good sound path, but the depth reading is 3.18in instead of 0,750in. I use a 45 deg. angle transducer and the thickness of the plate on my machine is set at 1.750in.
: Is it possible that my machine can't give me the depth after Leg 1 and that I always have to use formulas.
: Thanks a lot,
: LouisB
------------ End Original Message ------------




 


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